Patent Publication Number: US-2023151992-A1

Title: Air conditioner outdoor unit, air conditioner and control method thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Chinese Patent Application No. 202111347192.X, filed on Nov. 15, 2021, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the technical field of air conditioning, and in particular, to an air conditioner outdoor unit, an air conditioner and a control method thereof. 
     BACKGROUND 
     With an advancement of science and technology and an improvement of people&#39;s living standards, air conditioners have gradually entered people&#39;s lives and become an indispensable product in people&#39;s work and life. 
     An air conditioner (e.g., an inverter air conditioner) has a standby state and a working state, and a power consumption of the air conditioner in the standby state is an energy efficiency parameter of the air conditioner. 
     SUMMARY 
     In an aspect, an air conditioner outdoor unit is provided. The air conditioner outdoor unit includes a power supply circuit, a load circuit and a main controller. The power supply circuit includes a resistor and a relay connected in parallel, and an input of the power supply circuit is used for coupling with a power supply. The load circuit includes a plurality of sub-load circuits coupled to an output of the power supply circuit. The main controller is coupled to the relay, and in a case where the air conditioner outdoor unit is in a standby state, the main controller is configured to control the relay to turn off, to cause current to flow to at least one sub-load circuit of the plurality of sub-load circuits through the resistor to supply power to the load circuit; and in a case where the air conditioner outdoor unit is in a working state, the main controller is configured to control the relay to turn on, to cause current to flow to the at least one sub-load circuit of the plurality of sub-load circuits through the relay to supply power to the load circuit. 
     In another aspect, an air conditioner is provided. The air conditioner includes an air conditioner outdoor unit and an air conditioner indoor unit coupled to the air conditioner outdoor unit. The air conditioner outdoor unit includes a power supply circuit, a load circuit and a main controller. The power supply circuit includes a resistor and a relay connected in parallel, and an input of the power supply circuit is used for coupling with a power supply. The load circuit includes a plurality of sub-load circuits coupled to an output of the power supply circuit. The main controller is coupled to the relay, and in a case where the air conditioner outdoor unit is in a standby state, the main controller is configured to control the relay to turn off to cause current to flow to at least one sub-load circuit of the plurality of sub-load circuits through the resistor to supply power to the load circuit; and in a case where the air conditioner outdoor unit is in a working state, the main controller is configured to control the relay to turn on to cause current to flow to the at least one sub-load circuit of the plurality of sub-load circuits through the relay to supply power to the load circuit. 
     In yet another aspect, a control method of an air conditioner is provided. The air conditioner includes an air conditioner outdoor unit and an air conditioner indoor unit coupled to the air conditioner outdoor unit. The air conditioner outdoor unit includes a power supply circuit, a load circuit and a main controller. The power supply circuit includes a resistor and a relay connected in parallel. The load circuit includes a plurality of sub-load circuits coupled to an output of the power supply circuit. The method includes that in a case where the air conditioner outdoor unit is in a standby state, the main controller controls the relay to turn off to cause current to flow to at least one sub-load circuit of the plurality of sub-load circuits through the resistor to supply power to the load circuit; and, in a case where the air conditioner outdoor unit is in a working state, the main controller controls the relay to turn on to cause current to flow to the at least one sub-load circuit of the plurality of sub-load circuits through the relay to supply power to the load circuit. 
     In yet another aspect, a computer program product is provided. The computer program product includes computer program instructions stored on a non-transitory computer-readable storage medium. The computer program instructions are used to cause the computer to implement one or more functions of the control method of the air conditioner. 
     In yet another aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a program for controlling the air conditioner which, when executed by a computer, causes the computer to perform the control method of the air conditioner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe technical solutions in the present disclosure more clearly, accompanying drawings to be used in some embodiments of the present disclosure will be introduced briefly below. However, the accompanying drawings to be described below are merely accompanying drawings of some embodiments of the present disclosure, and a person of ordinary skill in the art may obtain other drawings according to these drawings. In addition, the accompanying drawings to be described below may be regarded as schematic diagrams, and are not limitations on an actual size of a product, an actual process of a method and an actual timing of a signal to which the embodiments of the present disclosure relate. 
         FIG.  1    is a schematic diagram of an air conditioner, in accordance with some embodiments; 
         FIG.  2    is a circuit diagram of an outdoor unit controller, in accordance with some embodiments; 
         FIG.  3    is a circuit diagram of another outdoor unit controller, in accordance with some embodiments; 
         FIG.  4    is a circuit diagram of yet another outdoor unit controller, in accordance with some embodiments; 
         FIG.  5    is a flow diagram of a control method of an air conditioner, in accordance with some embodiments; 
         FIG.  6    is a flow diagram of another control method of an air conditioner, in accordance with some embodiments; 
         FIG.  7    is a flow diagram of yet another control method of an air conditioner, in accordance with some embodiments; 
         FIG.  8    is a flow diagram of yet another control method of an air conditioner, in accordance with some embodiments; 
         FIG.  9    is a block diagram of a control device of an air conditioner, in accordance with some embodiments; 
         FIG.  10    is a block diagram of an air conditioner, in accordance with some embodiments; 
         FIG.  11    is a block diagram of an air conditioner outdoor unit, in accordance with some embodiments; and 
         FIG.  12    is a block diagram of another air conditioner, in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Technical solutions in some embodiments of the present disclosure will be described clearly and completely below with reference to the accompanying drawings. However, the described embodiments are merely some but not all embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure shall be included in the protection scope of the present disclosure. 
     Unless the context requires otherwise, throughout the specification and claims, the term “comprise” and other forms thereof such as the third-person singular form “comprises” and the present participle form “comprising” are construed as an open and inclusive meaning, i.e., “including, but not limited to.” In the description of the specification, the terms such as “one embodiment”, “some embodiments”, “exemplary embodiments”, “example”, “specific example” or “some examples” are intended to indicate that specific features, structures, materials, or characteristics related to the embodiment(s) or example(s) are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any suitable manner. 
     Hereinafter, the terms “first” and “second” are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, “a/the plurality of” means two or more unless otherwise specified. 
     In describing some embodiments, the expressions “coupled” and “connected” and their derivatives may be used. For example, the term “connected” may be used when describing some embodiments to indicate that two or more components are in direct physical or electrical contact with each other. For another example, the term “coupled” may be used when describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the term “coupled” or “communicatively coupled” may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents herein. 
     “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C”, and both include the following combinations of A, B, and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B and C. 
     “A and/or B” includes the following three combinations: only A, only B, and a combination of A and B. 
     As used herein, depending on the context, the term “if” is optionally interpreted to mean “when” or “in a case where” or “in response to determination” or “in response to detection.” Similarly, the phrase “if it is determined” or “if [a stated condition or event] is detected”, depending on the context, is optionally construed as “in a case where it is determined” or “in response to determining” or “in a case where [the stated condition or event] is detected” or “in response to detecting [the stated condition or event]”. 
     The use of the phrase “applicable to” or “configured to” herein means an open and inclusive language, which does not exclude devices that are applicable to or configured to perform additional tasks or steps. 
     In addition, the use of the phrase “based on” is meant to be open and inclusive, since a process, step, calculation or other action that is “based on” one or more of the stated conditions or values may, in practice, be based on additional conditions or values exceeding those stated. 
     The term “about”, “substantially” or “approximately” as used herein includes a stated value and an average value within an acceptable range of deviation of a particular value. The acceptable range of deviation is determined by a person of ordinary skill in the art, considering measurement in question and errors associated with measurement of a particular quantity (i.e., limitations of a measurement system). 
     The term such as “parallel”, “perpendicular” or “equal” as used herein includes a stated condition and a condition similar to the stated condition. A range of the similar condition is within an acceptable range of deviation. The acceptable range of deviation is determined by a person of ordinary skill in the art, considering measurement in question and errors associated with measurement of a particular quantity (i.e., limitations of a measurement system). For example, the term “parallel” includes absolute parallelism and approximate parallelism, and an acceptable range of deviation of the approximate parallelism may be, for example, a deviation within 5°; the term “perpendicular” includes absolute perpendicularity and approximate perpendicularity, and an acceptable range of deviation of the approximate perpendicularity may also be, for example, a deviation within 5°. The term “equal” includes absolute equality and approximate equality, and an acceptable range of deviation of the approximate equality may be, for example, a difference between two equals of less than or equal to 5% of either of the two equals. 
     Some embodiments of the present disclosure provide an air conditioner. As shown in  FIG.  1   , the air conditioner  1000  includes an air conditioner outdoor unit  10  and an air conditioner indoor unit  20 . The air conditioner outdoor unit  10  includes an outdoor unit controller  100 . The air conditioner indoor unit  20  includes an indoor unit controller  200 . The outdoor unit controller  100  is coupled to the indoor unit controller  200 . A main power supply of the air conditioner  1000  adopts an outdoor power supply mode. That is, a power supply (i.e., a commercial power) is first coupled to the air conditioner outdoor unit  10 , and then coupled to the air conditioner indoor unit  20  through the air conditioner outdoor unit  10 , so as to supply power to the outdoor unit controller  100  and the indoor unit controller  200 . 
     In some embodiments, as shown in  FIGS.  1  and  2   , the outdoor unit controller  100  includes a main controller  110 , a power supply circuit  120  and a load circuit  130 . The main controller  110  includes, for example, a microcontroller unit (MCU). The load circuit  130  includes a plurality of sub-load circuits. 
     As shown in  FIG.  2   , an input Lin of the power supply circuit  120  may be coupled to the indoor unit controller  200 , and an output Lout of the power supply circuit  120  may be coupled to the load circuit  130 . The input Lin of the power supply circuit  120  is further used for coupling with the power supply. The power supply circuit  120  may include a resistor RT 01  and a relay K 01  connected in parallel. For example, the resistor RT 01  is a positive temperature coefficient (PTC) thermistor or a power resistor. For example, the relay K 01  is an electromagnetic relay. 
     In some embodiments, as shown in  FIG.  2   , the air conditioner outdoor unit  10  further includes an AC-DC (alternating current-direct current) conversion circuit  150 . The AC-DC conversion circuit  150  is coupled between the power supply circuit  120  and the load circuit  130 . The AC-DC conversion circuit  150  is configured to convert an AC (alternating current) power output from the output Lout of the power supply circuit  120  into a DC (direct current) power, and supply power to the load circuit  130 . 
     The main controller  110  is configured to determine whether the air conditioner  1000  is in a standby state. 
     In some examples, the main controller  110  may determine whether the air conditioner  1000  is in the standby state in real time. As shown in  FIG.  1   , the main controller  110  is coupled to the indoor unit controller  200 . If the main controller  110  receives a power-on signal sent by the indoor unit controller  200 , it is determined that the air conditioner  1000  is not in the standby state (e.g., the air conditioner  1000  being in a working state). If the main controller  110  receives a power-off signal sent by the indoor unit controller  200 , or if the main controller  110  does not receive a power-on signal sent by the indoor unit controller  200  within a preset period of time, it is determined that the air conditioner  1000  is in the standby state. 
     For example, that the main controller  110  does not receive the power-on signal from the indoor unit controller  200  within the preset period of time is, after the air conditioner  1000  is powered on and before the main controller  110  receives the power-on signal sent by the indoor unit controller  200  for a first time, the main controller  110  determines that the air conditioner  1000  is in the standby state. For another example, after receiving the power-off signal sent by the indoor unit controller  200  and before receiving the power-on signal, the main controller  110  determines that the air conditioner  1000  is in the standby state. 
     It will be noted that, in a case where the air conditioner  1000  is in the standby state, the air conditioner outdoor unit  10  is also in the standby state. In a case where the air conditioner  1000  is in the working state, the air conditioner outdoor unit  10  is also in the working state. That is, the main controller  110  may be configured to determine whether the air conditioner outdoor unit  10  is in the standby state. 
     In some examples, users may send a power-on command or a power-off command to the indoor unit controller  200  through, for example, a remote controller or buttons on body of the air conditioner indoor unit  20 . The indoor unit controller  200  may send the power-on signal to the main controller  110  after receiving the power-on command, and the indoor unit controller  200  may send the power-off signal to the main controller  110  after receiving the power-off command. 
     As shown in  FIG.  2   , the main controller  110  is coupled to the relay K 01 ; if it is determined that the air conditioner  1000  is in the standby state, the main controller  110  is further configured to control the relay K 01  to turn off, such that current flows to at least one sub-load circuit of the load circuit  130  through the resistor RT 01  to supply power to the load circuit  130 ; and, if it is determined that the air conditioner  1000  is in the working state, the main controller  110  is further configured to control the relay K 01  to turn on, such that current flows to the at least one sub-load circuit of the load circuit  130  through the relay K 01  to supply power to the load circuit  130 . 
     In some examples, in a case where the air conditioner  1000  is in the standby state, some of the sub-load circuits do not work (e.g., a detection circuit, a driving circuit and a display circuit may not work), therefore, a power of the load circuit  130  is relatively low (e.g., generally below 1 W). In this case, current flowing through the resistor RT 01  is sufficient to enable the at least one sub-load circuit to work normally. In a case where the air conditioner  1000  is in the working state, the main controller  110  is used to drive some components such as an inverter compressor or a fan, therefore, the power of the load circuit  130  is relatively high (e.g., greater than 1 kW). In this case, the relay K 01  is controlled to be turned on, since an on-resistance of the relay K 01  is almost zero, current flowing through the relay K 01  is sufficient to enable the load circuit  130  with a relatively high power to work normally. 
     In some embodiments of the present disclosure, if the air conditioner  1000  is in the working state, the relay K 01  is turned on, and power is supplied to the load circuit  130  through the relay K 01 . If the air conditioner  1000  is in the standby state, the relay K 01  is turned off, such that current flows to the at least one sub-load circuit of the load circuit  130  through the resistor RT 01  to supply power to the load circuit  130 . In a case where the air conditioner  1000  is in the standby state, the power of the load circuit  130  is small, and current flowing through the resistor RT 01  is small. Therefore, a power consumption of the air conditioner  1000  in the standby state may be reduced, and an energy efficiency ratio data of the air conditioner  1000  may be improved, thereby achieving energy saving and consumption reduction. Moreover, since current flowing through the resistor RT 01  is small, a temperature of the resistor RT 01  will not increase. Therefore, the resistor RT 01  will not enter a high-resistance state. 
     In some embodiments, the outdoor unit controller  100  may further include a capacitor C connected in parallel with the load circuit  130 . When the air conditioner  1000  is initially powered on, if the air conditioner  1000  enters the working state immediately, an excessive impulse current may be generated on the capacitor C. In order to avoid this situation, the main controller  110  is configured to determine whether the power-on signal sent by the indoor unit controller  200  is received within a first preset time after the air conditioner  1000  is powered on. If the main controller  110  receives the power-on signal within the first preset time after the air conditioner  1000  is powered on, it is determined that the air conditioner  1000  is in the working state. And when the air conditioner  1000  is powered on for the first preset time, the relay K 01  is controlled to be turned on, so as to supply power to the at least one sub-load circuit of the load circuit  130 . 
     In some examples, the first preset time is in a range of 1 s to 60 s inclusive. For example, it may be 1 s, 10 s, 30 s, 45 s, or 60 s. 
     For example, taking an example in which the first preset time is 30 s, when the air conditioner  1000  is coupled to the power supply, that is, when the main controller  110  receives a voltage signal sent by the power supply, the main controller  110  determines that the air conditioner  1000  is powered on, and further determines whether the air conditioner  1000  receives the power-on signal within 30 s after it is powered on. If the main controller  110  receives the power-on signal within 30 s, the main controller  110  determines that the air conditioner  1000  is in the working state, and controls the relay K 01  not to turn on until the air conditioner  1000  is powered on for 30 s. If the main controller  110  receives the power-on signal within 40 s after the air conditioner  1000  is powered on, the main controller  110  determines that the air conditioner  1000  is in the working state, and controls the relay K 01  to turn on immediately. 
     In some examples, the main controller  110  further includes at least one timer. For example, the main controller  110  includes a first timer configured to start timing when the air conditioner  1000  is powered on. In a case where the main controller  110  receives the power-on signal at a timing time of the first timer which is within the first preset time, the main controller will control the relay K 01  not to turn on until the timing time of the first timer reaches the first preset time. In a case where the main controller  110  receives the power-on signal at a timing time of the first timer which is greater than or equal to the first preset time, the main controller may control the relay K 01  to turn on immediately. 
     It can be understood that, in some embodiments of the present disclosure, when the air conditioner  1000  is initially powered on, if it is determined that a time when the power-on signal is received is within the first preset time after the air conditioner  1000  is powered on, the relay K 01  is controlled to be turned on at or after the first preset time after the air conditioner  1000  is powered on. In this way, the relay K 01  may be turned on when a post stage circuit enters a stable working state, so as to avoid that the excessive impulse current may be generated if the relay K 01  is turned on immediately at the initial powered on of the air conditioner  1000 , which may avoid affecting components in the air conditioner  1000 . If a time when the main controller  110  receives the power-on signal is after the first preset time, since the air conditioner  1000  has been in the standby state for a period of time (e.g., greater than the first preset time) when receiving the power-on signal, circuits and components located in the post stage of the power supply circuit  120  have entered the stable working state, and the excessive impulse current will not be generated due to a turning on of the relay K 01 . Therefore, the main controller  110  may immediately control the turning on of the relay K 01  after receiving the power-on signal. 
     As shown in  FIG.  2   , in some embodiments, in order to solve a problem that in a case where the air conditioner  1000  is in the standby state, current flowing through the resistor RT 01  may be insufficient to supply power to the at least one sub-load circuit of the load circuit  130 , the capacitor C is configured to supply power to the at least one sub-load circuit of the load circuit  130  in a case where the air conditioner  1000  is in the standby state. 
     In some embodiments, the main controller  110  is configured to control the relay K 01  to turn on for a third preset time every second preset time in a case where the air conditioner  1000  is in the standby state, so as to charge the capacitor C. In this case, the main controller is further configured to control the relay K 01  to turn on when a preset signal is received. 
     In some examples, the second preset time may be set as any value in a range of 1 min to 60 min inclusive. For example, the second preset time may be set as 5 min, 10 min, 30 min, 45 min or 60 min. In some examples, the third preset time may be set as any value in a range of 1 s to 60 s inclusive. For example, the third preset time may be set as 3 s, 10 s, 25 s, 40 s or 60 s. The preset signal is, for example, the power-on signal sent by the indoor unit controller  200 . 
     For example, in a case where the air conditioner  1000  is in the standby state, the main controller  110  controls the relay K 01  to turn off for 10 min, turn on for 3 s, turn off for another 10 min, and turn on for another  3  s until the main controller  110  receives the power-on signal to control the relay K 01  to be turned on. When the relay K 01  is turned on, the power supply may charge the capacitor C through the relay K 01 . 
     In some embodiments, the main controller  110  further includes a second timer configured to start timing in a case where the air conditioner  1000  enters the standby state. In a case where the air conditioner  1000  enters the working state, the second timer stops timing. 
     For example, in a case where the air conditioner  1000  enters the standby state, the second timer starts timing. When the timing time of the second timer reaches 10 min, the main controller  110  controls the relay K 01  to turn on for 3 s and then turn off (i.e., the timing time of the second timer being 603 s when the relay K 01  is turned off). When the timing time of the second timer reaches 1203 s, the main controller  110  controls the relay K 01  to turn on for 3 s and then turn off. By analogy, the main controller  110  periodically controls the relay K 01  to turn on and turn off. 
     In some embodiments, the relay K 01  may be always in a turn-off state within the second preset time. Alternatively, the relay K 01  may be in the turn-off state for some time, and in the turn-off state for some time within the second preset time. 
     It can be understood that, in a case where the air conditioner  1000  is in the standby state and current flowing through the resistor RT 01  is insufficient to satisfy a power consumption demand of the load circuit  130 , electric energy stored in the capacitor C is consumed, resulting in a drop in the DC voltage across the capacitor C. The capacitor C may be charged by the main controller  110  periodically controlling the relay K 01  to turn on, so that the DC voltage across the capacitor C is restored to a normal value. In this way, when current flowing through the resistor RT 01  is insufficient to supply power to the at least one sub-load circuit of the load circuit  130 , the capacitor C may supply power to the at least one sub-load circuit. 
     In some embodiments, as shown in  FIG.  2   , the outdoor unit controller  100  further includes a voltage sampling circuit  140 . The voltage sampling circuit  140  is, for example, a resistor voltage divider sampling circuit, which is coupled to the main controller  110  and is connected in parallel with the load circuit  130 . The voltage sampling circuit  140  is configured to detect a DC voltage across the load circuit  130 , divide the DC voltage, and send a voltage dividing signal Vad to the main controller  110 . The main controller  110  is configured to calculate the DC voltage across the load circuit  130  according to a voltage value of the voltage dividing signal Vad. The above-mentioned “divide the DC voltage” means dividing a DC voltage with a large voltage value into a DC voltage with a small voltage value according to a certain ratio. For example, the voltage sampling circuit  140  includes at least two resistors to implement the above-mentioned “divide the DC voltage”. 
     For example, the voltage sampling circuit  140  divides the DC voltage by 1/n of its original voltage to form the voltage dividing signal Vad, and transmits the voltage dividing signal Vad to a Vad terminal of the main controller  110 . The main controller  110  multiplies a voltage division value of the voltage dividing signal Vad by n to obtain a value of the DC voltage across the load circuit  130 . 
     In some embodiments, in order to prevent the resistor RT 01  from overheating and entering the high-resistance state due to a frequent on or off of the relay K 01 , and thus unable to supply power to the load circuit  130  normally, the air conditioner outdoor unit  10  further includes the voltage sampling circuit  140  coupled to the main controller  110 . In a case where the air conditioner  1000  is in the standby state and the relay K 01  is in the turn-off state, when a voltage change rate of the DC voltage across the load circuit  130  collected by the voltage sampling circuit  140  is continuously greater than or equal to a preset change rate for a fourth preset time, the main controller  110  is further configured to control the relay K 01  to turn off after turning on for a fifth preset time. 
     In some embodiments, the main controller  110  further includes a third timer. The third timer is configured to start timing when the relay K 01  is in the turn-off state and the voltage change rate across the load circuit  130  is greater than or equal to the preset change rate. If the voltage change rate across the load circuit  130  is continuously greater than or equal to the preset change rate for the fourth preset time, when a timing time of the third timer reaches the fourth preset time, the main controller  110  controls the relay K 01  to turn on for the fifth preset time and then turn off. In the above-mentioned timing process, if the voltage change rate across the load circuit  130  is less than the preset change rate at a certain moment, or the relay K 01  is turn on, the third timer stops timing and returns to zero. The third timer may further be configured to count the fifth preset time. 
     In some examples, the fourth preset time may be set as any value in a range of 1 min to 45 min inclusive. For example, the fourth preset time may be set as 3 min, 5 min, 10 min, 30 min or 45 min. The fourth preset time is less than the second preset time. The fifth preset time may be set as any value in a range of 1 s to 60 s inclusive. For example, the fifth preset time may be set as 3 s, 5 s, 10 s, 30 s, 45 s, or 60 s. 
     For example, as shown in  FIG.  2   , the voltage sampling circuit  140  detects the DC voltage across the load circuit  130 , which is at the post stage of the power supply circuit  120 , once per second. In a case where the voltage change rate of the DC voltage is greater than or equal to 0.1 V/s within 3 min (i.e., within 3 min, a difference between a voltage value of the DC voltage at a current second and a voltage value of the DC voltage at a previous second being greater than ±0.1 V), the main controller  110  controls the relay K 01  to turn on for 3 s. Since after the relay K 01  is turned on, current does not passes through the resistor RT 01 , but passes through the relay K 01  to supply power to the post stage. Therefore, when the relay K 01  is turned on, there is no current flowing through the resistor RT 01  and the power consumption is zero, and a temperature of the resistor RT 01  decreases, so that the load circuit  130  may be normally supplied with power. 
     In some embodiments, when the air conditioner  1000  is powered on, the second timer starts timing, and the voltage sampling circuit  140  starts to detect the DC voltage across the load circuit  130 , which is at the post stage of the power supply circuit  120 , once per second. When a difference between a voltage value of the DC voltage at a certain moment (the moment being before an end of the second timer counting the second preset time) and a voltage value of a previous second is greater than ±0.1 V, the third timer starts counting. During a timing process of the third timer, if the difference between the voltage value of the DC voltage and the voltage value of the previous second is continuously greater than ±0.1 V for the fourth preset time, when the timing time of the third timer reaches the fourth preset time, the main controller  110  controls the relay K 01  to turn on for the fifth preset time and then to turn off. 
     During the timing process of the third timer, if the change rate of the DC voltage is less than the preset change rate at a certain moment, or the relay K 01  turns on, the third timer stops timing and returns to zero. 
     In the above-mentioned example, the fourth preset time and the fifth preset time may be timed by a same timer. Alternatively, the fourth preset time and the fifth preset time may be timed by different timers. A number and function of the timer are not limited in the present disclosure, and it is within the scope of the present disclosure as long as an effect of accurately timing the above-mentioned preset time may be achieved. 
     In some embodiments, in a case where the air conditioner  1000  is in the standby state and the voltage sampling circuit  140  detects that the DC voltage across the load circuit  130  is less than a first preset voltage, the main controller  110  is further configured to control the relay K 01  to turn on; and in a case where the voltage sampling circuit  140  detects that the DC voltage across the load circuit  130  is greater than or equal to a second preset voltage, the main controller  110  is further configured to control the relay K 01  to turn off. The first preset voltage is less than or equal to the second preset voltage. The first preset voltage is, for example, 170 V, and the second preset voltage is, for example, 250 V. 
     For example, when the DC voltage across the load circuit  130  is less than the first preset voltage, and the main controller  110  controls the relay K 01  to turn on, since the on-resistance of the relay K 01  is almost zero and there is no voltage drop, current may flow to the load circuit  130  at the post stage through the relay K 01 , so as to supply power to the load circuit  130  and increase the DC voltage across the load circuit  130 . When the DC voltage across the load circuit  130  is greater than or equal to the second preset voltage, the main controller  110  controls the relay K 01  to turn off. When the relay K 01  is turned off, current flows to the at least one sub-load circuit of the load circuit  130  through the resistor RT 01  to supply power to the load circuit  130 . Since the resistor RT 01  has the voltage drop, the DC voltage across the load circuit  130  will decrease. When the DC voltage across the load circuit  130  is less than the first preset voltage again, the main controller  110  controls the relay K 01  to turn on again, and so on. In this way, it may be avoided that the DC voltage across the load circuit  130  is excessively low in a case where the air conditioner  1000  is in the standby state, thereby preventing an entire electronic control system of the air conditioner  1000  from running out of control. 
     In some embodiments, in a case where the air conditioner  1000  is in the standby state, the main controller  110  is further configured to control the voltage sampling circuit  140  to detect the DC voltage across the load circuit  130 ; in a case where the change rate of the DC voltage across the load circuit  130  within the fourth preset time is continuously greater than or equal to the preset change rate, the main controller  110  is further configured to control the relay K 01  to turn on for the fifth preset time and then turn off. During the fourth preset time, when a detected DC voltage across the load circuit  130  is less than the first preset voltage, the main controller  110  controls the relay K 01  to turn on until the DC voltage is greater than or equal to the second preset voltage, then the main controller  110  controls the relay K 01  to turn off, and the voltage sampling circuit  140  re-detects the change rate of the DC voltage across the load circuit  130 . 
     In some embodiments, as shown in  FIG.  3   , the air conditioner outdoor unit  10  further includes a switch  101 . The switch  101  couples the output Lout of the power supply circuit  120  to the at least one sub-load circuit, and the switch  101  is coupled to the main controller  110 . The main controller  110  may further be configured to control on or off of the switch  101 . For example, in a case where the air conditioner  1000  is in the standby state, the main controller  110  is further configured to control the switch  101  to turn off, so as to stop supplying power to the at least one sub-load circuit; and, in a case where the air conditioner  1000  is in the working state, the main controller  110  is further configured to control the switch  101  to turn on, so as to supply power to the at least one sub-load circuit. For example, power is supplied to all sub-load circuits. 
     In some examples, as shown in  FIG.  3   , the load circuit  130  includes a plurality of sub-load circuits such as a detecting circuit  102 , a driving circuit  103 , and a display circuit  104 . In this case, as shown in  FIG.  4   , the air conditioner outdoor unit  10  may include a plurality of switches  101  coupled to the plurality of sub-load circuits respectively. Alternatively, the air conditioner outdoor unit  10  may include one switch  101  coupled to the plurality of sub-load circuits. Of course, a coupling relationship between the switch  101  and the sub-load circuits is not limited thereto. The air conditioner outdoor unit  10  may include two switches  101 , one switch  101  is coupled to two or more sub-load circuits, and another switch  101  is coupled to one sub-load circuit. In a case where the air conditioner  1000  is in the standby state, power supply circuit interfaces of the plurality of sub-load circuits are provided at a post terminal of the plurality of switches  101 , and the main controller  110  flexibly controls the on or off of the plurality of switches  101 . In this way, the sub-load circuits at the working state may be flexibly powered, and thus the standby power consumption of the air conditioner  1000  may be reduced. 
     For example, in a case where the air conditioner  1000  is in the standby state, the detecting circuit  102 , the driving circuit  103  and the display circuit  104  may not work. In a case where the air conditioner  1000  is in the standby state, the main controller  110  controls the switch  101  coupled to the detecting circuit  102 , the driving circuit  103  and the display circuit  104  to turn off, which may further reduce the standby power consumption of the air conditioner  1000 . 
     In some examples, the detecting circuit  102 , for example, may be a temperature detecting circuit configured to detect a working ambient temperature of the air conditioner outdoor unit  10 . The driving circuit  103 , for example, may be a signal driving circuit configured to amplify a functional signal output by the outdoor unit controller  100 . The display circuit  104 , for example, may be a display circuit of an indicator light, or a display circuit of a display screen. The display circuit  104  is configured to transmit operation information of the air conditioner  1000  to the display device, and the operation information is displayed by the display device. The operation information may include, for example, the operation state of the air conditioner outdoor unit  10 . 
     In the air conditioner  1000  according to the embodiments of the present disclosure, it is possible to control the on or off of the relay K 01  in the power supply circuit  120  according to the working state of the air conditioner  1000  and the DC voltage across the load circuit  130  after the air conditioner  1000  is powered on without changing a circuit structure. In this way, not only the standby power consumption of the air conditioner  1000  may be reduced, but also an energy efficiency ratio data of the air conditioner  1000  may be improved, so as to achieve energy saving and consumption reduction. 
     Some embodiments of the present disclosure provide a control method of the air conditioner. The method is executed by, for example, a main controller  110 , and the main controller  110  may be the main controller  110  described in any of the above embodiments. As shown in  FIG.  5   , the method includes steps  1  to  4 . 
     In step  1 , the main controller  110  determines that the air conditioner  1000  is powered on. 
     For example, when the air conditioner  1000  is coupled to the power supply, that is, when the main controller  110  receives the voltage signal (e.g., the voltage signal from the power supply), it is determined that the air conditioner  1000  is powered on, and then step  2  is executed. 
     In step  2 , the main controller  110  determines whether the air conditioner  1000  is in the standby state. 
     For example, if the main controller  110  does not receive the power-on signal sent by the indoor unit controller  200 , or if the main controller  110  receives the power-off signal sent by the indoor unit controller  200 , it is determined that the air conditioner  1000  is in the standby state, and the main controller  110  controls the air conditioner  1000  to execute step  3 . If the main controller  110  receives the power-on signal sent by the indoor unit controller  200 , it is determined that the air conditioner  1000  is not in the standby state (e.g., the air conditioner  1000  being in the working state), and the main controller  110  controls the air conditioner  1000  to execute step  4 . 
     In step  3 , if the air conditioner  1000  is in the standby state, the main controller  110  controls the relay K 01  to turn off, such that current flows to at least one sub-load circuit of the load circuit  130  through the resistor RT 01  to supply power to the load circuit  130 . 
     If the air conditioner  1000  is powered on and in the standby state, the relay K 01  is controlled to be turned off, and current flows to at least one sub-load circuit of the load circuit  130  through the resistor RT 01  to supply power to the load circuit  130 . In this case, the resistor RT 01  does not enter the high-resistance state, so that the power consumption of the air conditioner  1000  in the standby state is reduced, and the energy efficiency ratio data of the air conditioner may be improved, so as to achieve energy saving and consumption reduction. 
     In step  4 , if the air conditioner  1000  is in the working state, the main controller  110  controls the relay K 01  to turn on, such that current flows to the at least one sub-load circuit of the load circuit  130  through the relay K 01  to supply power to the load circuit  130 . 
     In some embodiments, step  4  may include that the main controller  110  controlling the relay K 01  to turn on in a case where the air conditioner  1000  is in the working state and the air conditioner  1000  is powered on for the first preset time, such that current flows to the at least one sub-load circuit of the load circuit  130  through the relay K 01  to supply power to the load circuit  130 . In this way, the relay K 01  may be turned on when a post stage circuit enters the stable working state, so as to avoid that the excessive impulse current may be generated if the relay K 01  is turned on immediately at the initial powered on of the air conditioner  1000 , which may affect the components in the air conditioner  1000 . 
     It will be noted that, the main controller  110  further includes a timer configured to count each preset time in the air conditioner  1000 , such as a first preset time, a second preset time, a third preset time, a fourth preset time, and a fifth preset time. 
     In some embodiments, the air conditioner outdoor unit  10  of the air conditioner  1000  further includes a capacitor C connected in parallel with the plurality of sub-load circuits. As shown in  FIG.  6   , the method may further include step  5  other than the above-mentioned steps  1  to  4 . Step  5  may be executed after step  3 . 
     In step  5 , the main controller  110  controls the relay K 01  to turn on for a third preset time every second preset time, so as to charge the capacitor C. 
     in a case where the air conditioner  1000  is in the standby state, in order to prevent the current flowing through the resistor RT 01  from being insufficient to satisfy the power consumption requirement of the load circuit  130 , the main controller  110  may control the relay K 01  to turn on for the third preset time every second preset time. When the relay K 01  is turned on, the capacitor C may be charged through the relay K 01 . In this way, when current flowing through the resistor RT 01  is insufficient to supply power to the at least one sub-load circuit of the load circuit  130 , the capacitor C may supply power to the at least one sub-load circuit. 
     In some embodiments, the air conditioner outdoor unit  10  further includes a voltage sampling circuit  140 , and the output of the power supply circuit  120  is coupled to the main controller  110  through the voltage sampling circuit  140 . The voltage sampling circuit  140  is configured to detect the DC voltage across the load circuit  130 . As shown in  FIG.  7   , the method may further include step  6  other than the above-mentioned steps  1  to  4 . Step  6  may be executed after step  3 . 
     In step  6 , when the change rate of the DC voltage across the load circuit  130  within the fourth preset time is continuously greater than or equal to the preset change rate, the main controller  110  controls the relay K 01  to turn on for the fifth preset time and then turn off. 
     In a case where the air conditioner  1000  is in the standby state, the frequent on or off of the relay K 01  may cause the resistor RT 01  to overheat and enter the high-resistance state, and in order to avoid this situation, a DC voltage (e.g., Vdc) across the load circuit  130 , which is at the post stage of the power supply circuit  120 , may be detected by the voltage sampling circuit  140 ; and, when the change rate of the DC voltage is continuously greater than or equal to a preset change rate (e.g., 0.1 V/s) for the fourth preset time, the relay K 01  is controlled to be turned on by the main controller  110  for the fifth preset time (e.g., 1 s to 60 s). In this way, after the relay K 01  is turned on, current does not pass through the resistor RT 01 ; instead, power is supplied to the post stage through the relay K 01 . Therefore, when the relay K 01  is turned on, there is no current flowing through the resistor RT 01 , and the power consumption of the resistor RT 01  is zero, so that the temperature of the resistor RT 01  may be reduced and the resistor RT 01  may work properly. 
     In some embodiments, as shown in  FIG.  8   , the method may further include step  7  and step  8  other than the above-mentioned steps  1  to  4 . Step  7  and step  8  may be executed after step  3 . 
     In step  7 , when the voltage sampling circuit  140  detects that the voltage across the load circuit  130  is less than or equal to the first preset voltage, the main controller  110  controls the relay K 01  to turn on, and executes step  8 . 
     In step  8 , when the voltage sampling circuit  140  detects that the voltage across the load circuit  130  is greater than the second preset voltage, the main controller  110  controls the relay K 01  to turn off. The first preset voltage is less than or equal to the second preset voltage. 
     In a case where the air conditioner  1000  is in the standby state and the relay K 01  is in the turn-off state, current flows to the at least one sub-load circuit of the load circuit  130  through the resistor RT 01  to supply power to the load circuit  130 . Since the resistor RT 01  has the voltage drop, and the DC voltage across the load circuit  130  continues to decrease. Therefore, when the DC voltage across the load circuit  130  is less than the first preset voltage, the main controller  110  may control the relay K 01  to turn on and increase the DC voltage across the load circuit  130 . When the DC voltage across the load circuit  130  is greater than or equal to the second preset voltage, the main controller  110  controls the relay K 01  to turn off. In this way, the DC voltage across the load circuit  130  may be prevented from being excessively low when the air conditioner  1000  is in the standby state, thereby preventing an entire electronic control system of the air conditioner  1000  from running out of control. 
     In the control method of the air conditioner according to the embodiments of the present disclosure, it is possible to control the on or off of the relay K 01  in the power supply circuit  120  according to the working state of the air conditioner  1000  and the DC voltage across the load circuit  130  after the air conditioner  1000  is powered on without changing the circuit structure. In this way, not only the standby power consumption of the air conditioner  100  may be reduced, but also the energy efficiency ratio data of the air conditioner  1000  may be improved, so as to achieve energy saving and consumption reduction. 
     Some embodiments of the present disclosure provide a control device of the air conditioner.  FIG.  9    is a block diagram of the control device of the air conditioner, in accordance with some embodiments. As shown in  FIG.  9   , the control device  30  of the air conditioner includes a determination module  31 , a judgment module  32  and a control module  33 . 
     In some embodiments, the determination module  31  is configured to determine that the air conditioner is powered on. The judgment module  32  is configured to judge whether the air conditioner  1000  is in the standby state. The control module  33  is configured to control the on or off of the relay K 01 . 
     For example, in a case where the air conditioner  1000  is in the standby state, the control module  33  controls the relay K 01  to turn off, such that current flows to the at least one sub-load circuit of the load circuit  130  through the resistor RT 01  to supply power to the load circuit  130 . In a case where the air conditioner  1000  is in the working state, the control module  33  controls the relay K 01  to turn on, such that current flows to at least one sub-load circuit of the load circuit  130  through the relay K 01  to supply power to the load circuit  130 . 
     In some embodiments, when the air conditioner  1000  is powered on for the first preset time, the control module  33  is configured to control the relay K 01  to turn on, such that current flows to the at least one sub-load circuit of the load circuit  130  through the relay K 01  to supply power to the load circuit  130 . In this way, the relay K 01  may be turned on when the post stage circuits enter the stable working state, and it may be avoided that the excessive impulse current may be generated if the relay K 01  is turned on immediately at the time when the air conditioner  1000  is initially powered on. The excessive impulse current may affect the components in the air conditioner  1000 . 
     As shown in  FIG.  2   , in some embodiments, in order to solve a problem that in a case where the air conditioner  1000  is in the standby state, current flowing through the resistor RT 01  may be insufficient to supply power to the at least one sub-load circuit of the load circuit  130 , the outdoor unit controller  100  may further include a capacitor C connected in parallel with the load circuit  130 . The capacitor C is configured to supply power to the at least one sub-load circuit of the load circuit  130  in a case where the air conditioner  1000  is in the standby state. 
     In some embodiments, the control module  33  is configured to control the relay K 01  to turn on for the third preset time every second preset time, so as to charge the capacitor C in a case where the air conditioner  1000  is in the standby state. In this case, the control module  33  is further configured to control the relay K 01  to turn on when the control module  33  receives the power-on signal sent by the indoor unit controller  200 . 
     In some embodiments, as shown in  FIG.  9   , in order to prevent the resistor RT 01  from overheating and entering the high-resistance state due to the frequent on or off of the relay K 01 , the air conditioner outdoor unit  10  further includes a detection module  34 . In a case where the air conditioner  1000  is in the standby state and the relay K 01  is in the turn-off state, when the change rate of the DC voltage across the load circuit  130  collected by the voltage sampling circuit  140  is continuously greater than or equal to the preset change rate for the fourth preset time, the control module  33  is further configured to control the relay K 01  to turn off after turning on for the fifth preset time. 
     In some embodiments, in order to prevent the DC voltage across the load circuit  130  from being excessively low in the standby state, causing the entire electronic control system of the air conditioner  1000  to run out of control, in a case where the air conditioner  1000  is in the standby state, the control module  33  is further configured to controls the relay K 01  to turn on if the detection module  34  detects that the DC voltage across the load circuit  130  is less than the first preset voltage; and, the control module  33  is further configured to control the relay K 01  to turn off if the detection module  34  detects that the DC voltage across the load circuit  130  is greater than or equal to the second preset voltage. The first preset voltage is less than or equal to the second preset voltage. The first preset voltage is, for example, 170 V, and the second preset voltage is, for example, 250 V. 
     It can be understood that, in order to implement the above-mentioned functions, the air conditioner  1000  may include corresponding hardware structures and/or software modules for executing each function. The modules and steps of each example described in conjunction with the above-described embodiments of the present disclosure may be implemented in a form of a combination of hardware (e.g., circuits) and computer software. For example, functions of the determination module  31 , the judgment module  32 , the control module  33  and the detection module  34  may be implemented by circuits and/or software. 
     It will be noted that, when the control device  30  of the air conditioner in some embodiments of the present disclosure controls the air conditioner, its implementation manner is similar to that of the air conditioner in some embodiments of the present disclosure, and will not be repeated herein. 
     Some embodiments of the present disclosure further provide a computer program product. The computer program product includes computer program instructions, the computer program instructions enable a computer to implement one or more functions of the control method of the air conditioner according to any of the above embodiments. 
     Some embodiments of the present disclosure further provide a non-transitory computer-readable storage medium. A control program of the air conditioner is stored on the computer-readable storage medium. The computer is made to execute one or more steps of the control method of the air conditioner according to any one of the above embodiments when the control program of the air conditioner is executed by the computer. 
     For example, the computer-readable storage medium may include, but is not limited to: a magnetic storage device (e.g., a hard disk, a floppy disk, or a magnetic tape), an optical disk (e.g., a compact disk (CD)), a digital versatile disk (DVD), a smart card and a flash memory device (e.g., an erasable programmable read-only memory (EPROM), a card, a stick or a key drive). The various computer-readable storage media described in the present disclosure may represent one or more devices and/or other machine-readable storage media for storing information. The term “machine-readable storage media” may include, but are not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data. 
     Some embodiments of the present disclosure further provide an air conditioner outdoor unit  10 . As shown in  FIG.  10   , the air conditioner outdoor unit  10  is same as the air conditioner outdoor unit  10  included in the air conditioner  1000  in any of the above embodiments, and has beneficial effects of the air conditioner  1000  in any of the above embodiments, which will not be repeated herein. 
     Some embodiments of the present disclosure further provide an air conditioner outdoor unit  10 . As shown in  FIG.  11   , the air conditioner outdoor unit  10  includes the control device  30  of the air conditioner described in any of the above embodiments, and has beneficial effects of the control device  30  of the air conditioner described in any of the above embodiments, which will not be repeated herein. 
     Some embodiments of the present disclosure further provide an air conditioner  1000 . As shown in  FIG.  12   , the air conditioner  1000  includes a processor  40 , a memory  50 , and a control program of the air conditioner stored on the memory  50  and executable on the processor  40 . For example, the processor  40  may be a central processing unit (CPU). The memory  50  may be a random access memory (RAM) or a read-only memory (ROM). The control program of the air conditioner implements the control method of the air conditioner as described above when the control program of the air conditioner is executed by the processor  40 . 
     Beneficial effects of the control device  30 , the computer-readable storage medium, the air conditioner outdoor unit  10 , and the air conditioner  1000  are similar to that of the control method of the air conditioner described above, and will not be repeated herein. 
     The foregoing descriptions are merely specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or replacements that a person skilled in the art could conceive of within the technical scope of the present disclosure shall be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims. 
     A person skilled in the art will understand that, the scope of disclosure involved in the present disclosure is not limited to technical solutions formed by specific combinations of the above technical features, and shall cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of disclosure. For example, technical solutions formed by replacing the above features with technical features with similar functions disclosed in some embodiments (but not limited thereto).