Patent Publication Number: US-2022239135-A1

Title: Power supply control method of power conversion apparatus and power conversion apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2021/074179, filed on Jan. 28, 2021, the disclosure of which is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     Embodiments of the present application relate to the field of charging, and more specifically, relate to a power supply control method of a power conversion apparatus and a power conversion apparatus. 
     BACKGROUND 
     With the development of the times, an electric vehicle, due to its advantages such as high environmental protection, low noise, low use cost, has a huge market prospect and can effectively promote energy conservation and pollution reduction, which is beneficial to social development and progress. 
     In a low temperature environment below zero Celsius degree, due to the electrochemical characteristics of the battery in the hybrid electrical vehicle, a direct current charging may cause a risk of lithium plating to the battery, thus the charging capacity of a traditional lithium battery pack is greatly limited, even unable to be charged, and the charging time is too long, which seriously affects the customer&#39;s experience driving in the winter. 
     Therefore, the present application introduces a power conversion apparatus which is used for a power conversion between the charging pile and the power battery, but as to how to provide the power supply for the power conversion apparatus, there is no a clear solution at present. 
     SUMMARY 
     Embodiments of the present application provide a power supply control method for a power conversion apparatus and a power conversion apparatus, which can effectively solve the power supply problem of the power conversion apparatus. 
     One aspect provides a power supply control method for the power conversion apparatus, where the power conversion apparatus is configured to conduct a power conversion between the charging pile and the power battery, the method includes: conducting a power-on self-test with an auxiliary power of the charging pile by the power conversion apparatus; determining the power supply priority order of the charging power and the power battery on the basis of a state parameter of the power battery under the condition that the self-test of the power conversion apparatus succeeds; determining one of the charging power of the charging pile and the power battery with a higher power supply priority as a current working power of the power conversion apparatus by the power conversion apparatus. 
     By determining the one of the charging power for the charging pile and the power battery with a higher supply priority as a working power of the power conversion apparatus, embodiments of the present application can provide a stable working power to the power conversion apparatus without addition of the power supply device, thereby effectively solving the power supply problem of the power conversion apparatus. 
     In a possible implementation, where determining the power supply priority order of the charging power and the power battery on the basis of the state parameter of the power battery, comprises: determining the power supply priority order of the charging power and the power battery by the power conversion apparatus, on the basis of the electric quantity of the power battery. 
     State parameters of the power battery may include, for example, electric quantity, voltage, temperature etc., a power supply priority order of the charging power and the power battery is determined on the basis of the electric quantity of the power battery, which is intuitive, simple and easy to implement. 
     In a possible implementation, where determining the power supply priority order of the charging power and the power battery by the power conversion apparatus on the basis of the electric quantity of the power battery, comprises: determining that the power supply priority of the power battery is higher than the power supply priority of the charging power by the power conversion apparatus, under the condition that the electric quantity of the power battery is higher than a first threshold; or, determining that the power supply priority of the power battery is less than the power supply priority of the charging power by the power conversion apparatus, under the condition that the electric quantity of the power battery is less than or equal to the first threshold. 
     The first threshold can be obtained on the basis of the experience, for example it can be obtained by training a lot of samples. 
     By judging the power supply priority order of the power battery and charging power on the basis of a size relationship between the electric quantity of the power battery and the first threshold, it is beneficial to providing a stable working power for the power conversion apparatus, thereby wholly improving the power supply reliability of the power conversion apparatus. For example, when the electric quantity of the power battery is higher than the first threshold, it is believed that the power battery is sufficient to provide a stable power for the conversion apparatus, namely it is determined that the power supply priority of the power battery is higher than the power supply priority of the charging power. When the electric quantity of the power battery is less than or equal to the first threshold, it is believed that the power battery is insufficient to provide a stable power for the power conversion apparatus, namely, it is determined that the power supply priority of the power battery is less than the power supply priority of the charging power. 
     In a possible implementation, where the method further comprises: acquiring the auxiliary power by the power conversion apparatus when it is determined that the power conversion apparatus is in a normal working mode, the normal working mode is a working mode in which the charging pile, the power conversion apparatus and the power battery are interconnected. 
     In a possible implementation, where acquiring the auxiliary power by the power conversion apparatus when determining the power conversion apparatus is in a normal working mode, comprises: acquiring the auxiliary power by the power conversion apparatus when receiving a connection success information sent by the charging pile. 
     In a possible implementation, where before determining the one of the charging power of the charging pile and the power battery with a higher power supply priority as a current working power of the power conversion apparatus by the power conversion apparatus, the method further comprises: converting the charging power and/or the power battery into the working power of the power conversion apparatus by the power conversion apparatus. 
     In a possible implementation, where the method further comprises: in an off-line debugging mode of the power conversion apparatus, determining a standard grid or an external direct current power as the current working power of the power conversion apparatus by the power conversion apparatus. 
     Using the standard grid or the external direct current power as the working power of the power conversion apparatus, is beneficial for reducing the complexity of the power supply strategy. 
     In a possible implementation, where before determining the standard grid as the working power of the power conversion apparatus by the power conversion apparatus, the method further comprises: converting the standard grid into the working power of the power conversion apparatus by the power conversion apparatus. 
     In a possible implementation, where the power conversion apparatus is configured to convert a direct current output by the charging power into a pulse current and conduct the charge to the power battery. 
     Another aspect provides a power conversion apparatus, where the power conversion apparatus is configured to conduct a power conversion between the charging pile and the power battery, the power conversion apparatus includes: a self-test module, configured to conduct a power-on self-test by using an auxiliary power of the charging pile; a determining module, configured to determine the power supply priority order of the charging power and the power battery on the basis of a state parameter of the power battery, under the condition that the self-test of the power conversion apparatus succeeds; a power supply module, configured to determine the one of the charging power of the charging pile and the power battery with a higher power supply priority as a current working power of the power conversion apparatus. 
     In a possible implementation, where the determining module is specifically configured to: determine the power supply priority order of the charging power and the power battery, on the basis of the electric quantity of the power battery. 
     In a possible implementation, where the determining module is specifically configured to: determine that the power supply priority of the power battery is higher than the power supply priority of the charging power, under the condition that the electric quantity of the power battery is higher than a first threshold; or determine that the power battery of power supply priority is less than the power supply priority of the charging power, under the condition that the electric quantity of the power battery is less than or equal to the first threshold. 
     In a possible implementation, where the power conversion apparatus further includes: an acquiring module, configured to acquire the auxiliary power when determining that the power conversion apparatus is in a normal working mode, the normal working mode is a working mode in which the charging pile, the power conversion apparatus and the power battery are interconnected. 
     In a possible implementation, where the acquiring module is specifically configured to: acquire the auxiliary power when receiving the connect success information sent by the charging pile. 
     In a possible implementation, the power conversion apparatus further includes: a direct current to direct current (DC-DC) module, configured to convert the charging power and/or the power battery into the working power of the power conversion apparatus before the power conversion apparatus determines the one of the charging power of the charging pile and the power battery with the higher power supply priority as a current working power of the power conversion apparatus. 
     In a possible implementation, the power supply module is further configured to: in an off-line debugging mode of the power conversion apparatus, determining a standard grid or an external direct current power as the current working power of the power conversion apparatus. 
     In a possible implementation, where the power conversion apparatus further includes: an alternating current to direct current (AC-DC) module, configured to convert the standard grid into the working power of the power conversion apparatus before the power conversion apparatus determines the standard grid as the working power of the power conversion apparatus. 
     In a possible implementation, where the power conversion apparatus is configured to convert a direct current output by the charging power into a pulse current and conduct the charge the power battery. 
     A third aspect provides a power conversion apparatus including a memory and a processor, the memory is configured to store an instruction, the processor is configured to read the instruction and execute the method of the above-mentioned first aspect and any possible implementation of the first aspect based on the instruction. 
     A fourth aspect provides a readable storage medium for storing a computer program, the computer program is configured to execute the method of the above-mentioned first aspect and any possible implementation of the first aspect. 
     Therefore, based on the technical solution of embodiments of the present application, in case that the charging power of the charging pile and the power battery do not output, a self-test is first conducted by using an auxiliary power of the charging pile, and after the self-test succeeds, the working power of the power conversion apparatus is switched from the auxiliary power of the charging pile into the one of the charging power of charging pile and the power battery with the higher power supply priority on the basis of state parameter of the power battery, which can provide a stable working power for the power conversion apparatus without additional power supply device, thereby effectively solving the power supply problem of the power conversion apparatus. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate the technical solution of embodiments of the present application, the accompanying figures required in embodiments of the present application will be briefly introduced, obviously, the accompanying drawings described below are merely some embodiments of the present application, for those of the ordinary skill in the art, they can also obtain other accompanying drawings from the accompanying drawing without paying a creative work. 
         FIG. 1  is schematic block diagram of a power conversion apparatus. 
         FIG. 2  is a schematic block diagram of a power supply control method for a power conversion apparatus provided by embodiments of the present application. 
         FIG. 3  is a schematic block diagram of a power conversion apparatus provided by embodiments of the present application. 
         FIG. 4  is another schematic block diagram of a power conversion apparatus provided by embodiments of the present application. 
         FIG. 5  is a schematic block diagram of a power supply control system provided by embodiments of the present application. 
         FIG. 6  is another schematic block diagram of a conversion apparatus provided by embodiments of the present application. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The technical solution of the present application embodiment will be described in conjunction with the accompanying drawings below. 
     A power battery is a battery for providing a power source for the power consumption device. Optionally, the power battery may be a power storage battery. For the type of the battery, the power battery can be a lithium-ion battery, a lithium metal battery, a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-sulfur battery, a lithium-air battery or a sodium-ion battery etc., embodiments of the present application have no specific limit. For the battery size, the power battery in the present application embodiment can be a battery core, it can also be a battery module or a battery pack, embodiments of the present application have no specific limit. Optionally, the power consumption device may be a vehicle, a ship or a spacecraft etc., and embodiments of the present application have no limit on this. A battery management system (BMS) of the power battery is a control system which protects the use safety of the power battery, implementing a charging and discharging management, high voltage control, battery protection, battery data collection, battery state evaluation etc. 
     A charging pile, also known as charger, is a device for charging the power battery. The charging pile can output a charging power in accordance with charging demand of the BMS, to charge the power battery. For example, the charging pile can output a voltage and a current in accordance with a demand voltage and a demand current sent by BMS. 
     However, in some special cases, the range of voltage and current output by the charging pile is unable match with the power battery. For example, in a low temperature scenario, a minimum voltage or current output by the charging pile may also cause a lithium plating during the charging, the power battery cannot be normally charged. In addition, in some cases, a conversion of power form may be required between the charging pile and the power battery, for example: voltage change, current change, power state change, current, voltage, power timing change, etc. 
     In view of the above situation, embodiments of the present application introduce a power conversion apparatus between the charging pile and the power battery, the power conversion apparatus can conduct a power conversion between the charging pile and the power battery. If it is required to conduct a power conversion between the charging pile and the power battery, the power conversion apparatus converts the power type output by the charging pile into power type required by the power battery. For example, the power conversion apparatus can convert a direct current power output by the charging pile into a pulse power, or, change the voltage value, change current value, or change timing of voltage and current, etc. 
       FIG. 1  is a schematic diagram of an application framework of a power conversion apparatus according to embodiments of the present application. As shown in  FIG. 1 , the power conversion apparatus  110  is provided between the charging pile  120  and the BMS of the power battery, namely, power conversion apparatus  110  is connected with the charging pile  120  and the BMS  130  respectively, and the charging pile  120  is not directly connected with the BMS  130 . 
     In the case that the power conversion apparatus  110  is not provided, when the power battery is charged, the charging pile  120  is directly connected with the BMS  130 , then the charging process is started, to charge the power battery. As mentioned above, in some cases, the charging pile  120  may be unable to directly normally charge the power battery. Therefore, in embodiments of the present application, a power conversion apparatus  110  is added, and power conversion is conducted between the charging pile  120  and the power battery. 
     Optionally, the power conversion apparatus  110  can include a control unit  111  and a power unit  112 . The control unit  111  is responsible for detecting the states of the charging pile  120  and the BMS  130  during the charging; the control unit  111  is respectively connected to the charging pile  120  and the BMS  130  via a communication line  140 , to conduct an information interaction respectively with the charging pile  120  and the BMS  130 . In addition, the control unit  111  is also connected with the power unit  112  via the communication line  140 , to conduct an information interaction with the power unit  112  and control the power unit  112  to conduct the power conversion. For example, the communication line  140  may be a communication line for controller area network (CAN). 
     The power unit  112  is responsible for converting the power type output by the charging pile  120  into the power type required by the power battery, on the basis of instruction from the control unit  111 . The power unit  112  is connected with the control unit  111  via the communication line  140  to conduct the information interaction. A communication protocol can be configured between the control unit  111  and the power unit  112 , for example, syntax, semantics and timing which define the communication, etc., to ensure the normal interaction between the control unit  111  and the power unit  112 . 
     A control strategy can be configured on the control unit  111 . For example, the control unit  111  determines a state of the present charging process by parsing the charging message between the charging pile  120  and the BMS  130 , to control the corresponding operation conducted by the power unit  112 . For example, when the pre-charging condition is met, power unit  112  is controlled to conduct a pre-charging operation. Meanwhile the control unit  111  communicates with the power unit  112 , and acquires the state of the power unit  112 , to execute the corresponding operation. For example, when the power unit  112  reports a failure, the control unit  111  timely sends a stop pre-charging command 
     The power unit  112  is respectively connected with the charging pile  120  and the BMS  130  via a high voltage line  150 , to convert the charging power output by the charging pile  120  via the high voltage line 150  and then output to the BMS to charge the power battery. 
     Optionally, there are capacitors with high capacity in the power conversion apparatus  110 , for example, a first capacitor  161  and a second capacitor  162 . 
     Optionally, in embodiments of the present application, the battery pack managed by the BMS  130  can be called as the power battery. 
     Optionally, the power conversion apparatus can be integrated into the charging pile or the hybrid electrical vehicle, it can also be an independent apparatus. If the power conversion apparatus is integrated into the charging pile or the hybrid electrical vehicle, the charging pile or power battery can conduct a power supply to the power conversion apparatus. If the power conversion apparatus is an independent apparatus, the power conversion apparatus can obtain the electricity by a traditional method namely via a standard grid (namely, municipal electricity provided by the government) or an external direct current power, or, the power conversion apparatus can also obtain electricity via an auxiliary power or charging power of the charging pile, or a power battery, in case that it is respectively connected with the charging pile and the power battery. The external direct current power in embodiments of the present application should include but not limited to devices such as portable charger etc. 
     That is to say, in embodiments of the present application, when the power conversion apparatus can obtain multiple powers, one power can be chosen from the multiple powers as the working power of the power conversion apparatus. 
     In a possible embodiment, the power supply priority of the multiple powers can be set in advance, in case that the power conversion apparatus obtains the multiple powers, and one power can be chosen from the multiple powers as the working power of the power conversion apparatus based on the preset power supply priority. 
     It should be noted that, the standard grid is of alternating current electricity, the charging power and the power battery are of high voltage electricity, and the working power of the power conversion apparatus is of low voltage and direct current, thus, before providing the power supply for the power conversion apparatus, it is required to convert the one chosen power supply into the working power of the power conversion apparatus. 
     Embodiments of the present application are mainly based on in case that the power conversion apparatus with the charging pile and the power battery are respectively connected, how to provide the power supply for the power conversion apparatus. Specifically, as shown in  FIG. 2 , the method  200  includes a portion or all of the following steps: 
     S 210 , conducting a power-on self-test with an auxiliary power of a charging pile by the power conversion apparatus; 
     S 220 , determining the power supply priority order of the charging power and the power battery on the basis of a state parameter of the power battery, under the condition that the self-test of the power conversion apparatus succeeds; 
     S 230 , determining the one of the charging power of the charging pile and the power battery with a higher power supply priority as the current working power of the power conversion apparatus by the power conversion apparatus. 
     Specifically, if the power conversion apparatus is in the normal working mode, namely, a working mode in which the power conversion apparatus, the charging pile and the power battery are interconnected, the auxiliary power of the charging pile may first output, at this moment because the high voltage system is not power-on, but the power conversion apparatus needs a self-test and communicating with the charging pile and the BMS managing the power battery, thus, at this moment the power-on self-test can be conducted by using the auxiliary power of the charging pile, after the self-test succeeds and the high voltage system is power-on, the power supply can be provided for the power conversion apparatus by using the charging power of the charging pile or the power battery. Further, the one of the charging power and power battery with the higher priority can be regarded as the working power of the power conversion apparatus, on the basis of the preset power supply priority. 
     Usually, when the gun head and the gun base of the charging pile, the power conversion apparatus and the power battery are interconnected, the charging pile can be aware of the connection success information, the auxiliary power of the charging pile starts to output, correspondingly, the power conversion apparatus can acquire the auxiliary power. Optionally, after the charging pile is aware of the connection success information, it can also send the connection success information to the power conversion apparatus, correspondingly, after the power conversion apparatus receives the connection success information sent by the charging pile, it can acquire the auxiliary power. 
     When the power conversion apparatus conducts the self-test by using the auxiliary power, meanwhile the power conversion apparatus respectively communicates with the charging pile and the BMS, after the self-test of the power conversion apparatus succeeds and information interaction is conducted with the charging pile and the BMS, the charging pile and the BMS can respectively close the switch at the high voltage side, namely, the charging power of the charging pile outputs, power battery outputs. When the power conversion apparatus not only acquires the charging power, but also acquires the power battery, the power conversion apparatus can also determine the working power of the power conversion apparatus on the basis of preset power supply priority. In other words, when the priority of the power battery is higher than that of the charging battery, the working power of the power conversion apparatus is switched from the auxiliary power to the power battery; when the priority of the charging battery is higher than that of the power battery, the working power of the power conversion apparatus is switched from the auxiliary power to the charging power. 
     Optionally, in embodiments of the present application, before determining the working power of the power conversion apparatus, the power supply priority order of the charging power and the power battery can be first determined. 
     Optionally, the power supply priority order of the charging power and the power battery can be determined by some state parameters of the charging power and the power battery. For example, the power supply priority order of the charging power and the power battery can be determined by electric quantity of the power battery. For another example, the power supply priority order of the charging power and the power battery can be determined on the basis of the temperature of the power battery. For another example, the power supply priority order of the charging power and the power battery can be determined on the basis of state of charge (State of Charge, SOC) or voltage of the power battery. Embodiments of the present application have no limit on the state parameter for determining the power supply priority order of the charging power and the power battery. 
     The power supply priority order of the charging power and the power battery is determined on the basis of the electric quantity of the power battery, specifically, the power supply priority order of the two can be determined on the basis of a preset first threshold. For example, when the electric quantity of the power battery is higher than the first threshold, it is believed that the power battery is sufficient to provide a stable power for the power conversion apparatus, namely it is determined that the power supply priority of the power battery is higher than the power supply priority of the charging power. When the electric quantity of the power battery is less than or equal to the first threshold, it is believed that the power battery is insufficient to provide a table power for the power conversion apparatus, namely, it is determined that the power supply priority of the power battery is less than the power supply priority of the charging power. 
     Optionally, the power supply priority order of the charging power and the power battery can also be determined on the basis of the temperature of the power battery. Specifically, the power supply priority order of the two can be determined on the basis of a preset second threshold. For example, when the temperature of the power battery is higher than the second threshold, it is believed that the power battery is sufficient to provide stable power for the power conversion apparatus, namely, it is determined that the power supply priority of the power battery is higher than the power supply priority of the charging power. When the temperature of the power battery is less than or equal to the second threshold, it is believed that the power battery is insufficient to provide a stable power for the power conversion apparatus, namely, it is determined that the power supply priority of the power battery is less than the power supply priority of charging power. 
     It should be noted that, various thresholds in embodiments of the present application, such as the first threshold, the second threshold etc., all can be obtained by experience. In other words, they are obtained by a lot of experiments. It can be believed that, the first threshold or the second threshold is a critical value which can provide a table power for the power conversion apparatus. 
     Alternatively, it is defaulted that the power supply priority of the power battery is higher than the power supply priority of the charging power, namely, the power conversion apparatus directly regards the power battery as its working power. 
     The power supply priority order of the above-mentioned each power can also be preset in advance, and stored inside the power conversion apparatus. For example, the power supply priority order of a standard grid 1, an external direct current power 2, an auxiliary power 3, a charging power 4 and a power battery 5 be in advance preset as: 5&gt;4&gt;2&gt;1&gt;3. For another example, the priority order can be: 5&gt;2&gt;4&gt;1&gt;3. 
     In order to avoid the impact of the output power difference of the auxiliary power of different charging piles on the power supply of the power conversion apparatus, in embodiments of the present application, the power supply priority of the auxiliary power can be set as the lowest. 
     Optionally, in embodiments of the present application, when the power conversion apparatus acquires multiple powers, the multiple powers can first be converted into the working power of the power conversion apparatus, then one is chosen to provide the power supply for the power conversion apparatus. Or one power can also be chosen from the multiple powers first, and then be converted into the working power of the power conversion apparatus to provide a power supply for it. 
     When the power conversion apparatus is in an off-line debugging mode, in other words, the power conversion apparatus is in course of development and maintaining, namely, the power conversion apparatus is not connected with the charging pile or the power battery, a standard grid or an external direct current power can provide the power supply for the power conversion apparatus. When it is required to provide a power supply for the power conversion apparatus by using the standard grid, the standard grid can be first converted into a direct current. 
     Optionally, in embodiments of the present application, the power supply can be provided directly to the power conversion apparatus by the standard grid, thereby reducing the complexity of the system power supply strategy. 
     Optionally, in embodiments of the present application, when the power conversion apparatus can acquire multiple powers, the working power of the power conversion apparatus can also be switched among the multiple powers. Specifically, the working power of the power conversion apparatus can be switched from the power with a lower power supply priority to the power with a higher power supply priority. 
     The power supply control method for the power conversion apparatus of embodiments of the present application has been described in detail above, the power supply control device of the present application embodiment will be described in detail in conjunction with  FIG. 3  and  FIG. 4  below. The technical features described in the method embodiment apply in the following device embodiment. 
       FIG. 3  shows a schematic block diagram of a power conversion apparatus  300  of embodiments of the present application. As shown in  FIG. 3 , the power conversion apparatus  300  includes: 
     A self-test module  310 , configured to conduct the power-on self-test by using an auxiliary power of the charging pile; 
     A determining module  320 , configured to determine the power supply priority order of the charging power and the power battery on the basis of a state parameter of the power battery, under the condition that the self-test of the power conversion apparatus succeeds; 
     A power supply module  330 , configured to determine the one of the charging power of the charging pile and the power battery with a higher power supply priority as a current working power of the power conversion apparatus. 
     It should be noted that, the power output by the power supply module  330  can meet the demand of different vehicle types, a boosting or step-down circuit can also integrated into the power conversion apparatus, to realize the match with the charging pile and the power battery. 
     The power supply control device which is the power conversion apparatus of embodiments of the present application can be integrated in the power conversion apparatus, namely, the power supply control device is the power conversion apparatus, it can also be independent of the power conversion apparatus, and separately provides the working power for the power conversion apparatus. 
     Optionally, in embodiments of the present application, the determining module  320  is specifically configured to: determine the power supply priority order of the charging power and the power battery, on the basis of electric quantity of the power battery. 
     Optionally, in embodiments of the present application, the determining module  320  is specifically configured to: determine that the power supply priority of the power battery is higher than the power supply priority of the charging power, under the condition that the electric quantity of the power battery is higher than a first threshold; or, determine that the power supply priority of the power battery is less than the power supply priority of the charging power, under the condition that the electric quantity of the power battery is less than or equal to the first threshold. 
     Optionally, as shown in  FIG. 4 , the power conversion apparatus  300  also includes: an acquiring module  340 , configured to: acquire the auxiliary power when determining the power conversion apparatus is in a normal working mode, the normal working mode is a working mode in which the charging pile, the power conversion apparatus and the power battery are interconnected. 
     Optionally, in embodiments of the present application, the acquiring module  340  is specifically configured to: acquire the auxiliary power when receiving a connection success information sent by the charging pile. 
     Optionally, as shown in  FIG. 4 , the power conversion apparatus  300  also includes: a direct current to direct current (DC-DC) module  350 , configured to: convert the charging power and/or the power battery into a working power of the power conversion apparatus before the power conversion apparatus determines the one of the charging power of the charging pile and the power battery with a higher power supply priority as the current working power of the power conversion apparatus. 
     Optionally, the power conversion apparatus  300  can include one DC-DC module  350 , in other words, the charging power and the power battery can share one DC-DC module  350 ; the power conversion apparatus  300  can also include two DC-DC modules  250 , in other words, the charging power and the power battery respectively use one DC-DC module  350 . 
     Optionally, in embodiments of the present application, the power supply module  330  is also configured to: in an off-line debugging mode of the power conversion apparatus, determine a standard grid or an external direct current power as the current working power of the power conversion apparatus. 
     Optionally, as shown in  FIG. 4 , the power conversion apparatus  300  also includes: 
     An alternating current to direct current (AC-DC) module  360 , configured to convert the standard grid into the working power of the power conversion apparatus before the power conversion apparatus determines the standard grid as the working power of the power conversion apparatus. 
     Optionally, in embodiments of the present application, the power conversion apparatus  300  is configured to convert a direct current output by the charging power into a pulse current and charge to the power battery. 
       FIG. 5  shows a schematic block diagram of a power supply control system, as shown in  FIG. 5 , the power supply control system includes a charging pile  510 , a BMS  520 , a power unit  50 , a control unit  540 , a power supply module  550 , a DC-DC module  560  and a AC-DC module  570 , where, the power unit  530  and the control unit  540  constitute a power conversion apparatus, optionally, the power supply module  550 , the DC-DC module  560  and the AC-DC module  570  can also be integrated into the power conversion apparatus. In can be seen from  FIG. 5 , the standard grid after being converted by AC-DC module  570  is output by the power supply module  350 , and the auxiliary power A+/A− and external direct current power are directly output by the power supply module  550 , the charging power DC+/DC− and the BMS are required to be output by the power supply module  550  after the DC-DC conversion. 
     Optionally, the power supply module  550  can correspond to the power supply module  330 , the determining module  320  and the acquiring module  340  in the above-mentioned power conversion apparatus  300 , while the self-test module  310  in the power conversion apparatus  300  can be implemented by the control unit  540  and the power unit  530 . 
       FIG. 6  shows a schematic block diagram of a power conversion apparatus  600  of another embodiment of the present application. As shown in  FIG. 6 , a power conversion apparatus  600  includes a memory  610  and a processor  620 , where, the memory  610  is configured for storing an instruction, the processor  620  is configured for reading the instruction and executing the method of aforementioned various embodiments of present application based on the instruction. 
     Embodiments of the present application also provide a readable storage medium for storing a computer program, the computer program is configured for executing the method of aforementioned various embodiments of the present application. 
     Those of ordinary skill in the art can realize that, the unit and algorithm step described in conjunction with the embodiments disclosed herein, can implemented by an electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by the hardware or by the soft depends on the specific application of the technical solution and design constraints. Those of ordinary skill in the art can implement the described function by different methods for every specific application, but such supplementation should not be regarded as exceeding the scope of the present application. 
     Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the above-mentioned described system, device and unit can refer to the corresponding process in the aforementioned method embodiments, and it will not be repeated here. 
     In several embodiments provided by the present application, it should be understood that, the disclosed system, device and method can be implemented in other manner. For example, the device embodiments described above are only schematic, for example, the division of the unit is merely a division of logic function, the actual implementation can have additional division method, for example multiple units or assemblies can be combined or can be integrate into another system, or some features can be omitted or not implemented. In addition, the mutual interconnection or direct interconnection or communication connect can be indirect interconnection or communication connection via some interfaces, devices or units, they can be electric, mechanical or in other forms. 
     The unit illustrated as a separate component may be or may on be physically separated, the components shown as a unit may be or may not be a physical unit, namely can be located in one place, or can be distributed to multiple network units. A portion of or all of the units can be chosen according to actual demand to accomplish the purpose of this embodiment. 
     In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, they can also be separate physical presence of each unit, two or more units can also be integrated into one unit. 
     If the function is implemented in manner of software and sold or used as an independent product, it can be stored in one computer readable storage medium. Based on such a understanding, the technical solution of present application can be essentially or the portion which contributes the prior art or a portion of the technical solution can be embodied in software product, the computer software product is stored in one storage medium, including several instructions for one computer apparatus (it may be a personal computer, a server, or a network apparatus, etc.) executing all of or a portion of the steps of method in each embodiment of the present application. The aforementioned storage medium includes: USB flash drive, mobile hard disk drive, read-only memory (ROM), random access memory (RAM), disk or optical disk or several media which can store a program code. 
     The above are only the specific embodiments of the present application, but the protection scope of the present application is not limited to this, the change or replacement within the technical scope of the present application occur to any person skilled in the art, they all should be covered in the scope of protection of the present application. Therefore, the protection scope of the present application should subject to the protection scope of the claims.