Patent Publication Number: US-10314124-B1

Title: LED driving power supply based on 2.4G remote controlling adjustment of brightness and color temperature

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority of CN201810488575.0, Chinese patent application filed on May 21, 2018. The contents of CN201810488575.0 are all hereby incorporated by reference. 
     TECHNICAL FIELD 
     The present application relates to the field of LED driving power supply, and more particularly, to an LED driving power supply based on 2.4 G remote controlling adjustment of brightness and color temperature. 
     BACKGROUND 
     With the advancement of technology and the improvement of people&#39;s living standard, intelligent home products have gradually entered the lives of ordinary people. Intelligent home products have become more and more popular to consumers. Traditional lighting products have gradually changed from traditional energy-saving lamp to energy-saving and environment-friendly, long life LED lamp, then to intelligent and customizable LED lamp. With consuming upgrade, intelligent lighting products will gradually become mainstream products; intelligent remote control, stepless adjustment of color temperature, stepless adjustment of brightness, combined control and other functions will be favored by the end consumers. 
     Currently, on the market, the lighting products with the remote control function mainly use infrared remote control, and the adjustment of brightness and color temperature is basically a segmented adjustment, and infrared remote control mode also has a problem of short distance of remote control, generally only 5-10 m, and it is one-to-one control, cannot simultaneously control multiple groups of lamps, and infrared remote control also has the problem of dead angle of remote control. 
     In view of this, it is necessary to provide an LED driving power based on 2.4 G remote controlling adjustment that could realize stepless adjustment of brightness and color temperature and long remote control distance to solve the above defects. 
     SUMMARY 
     The technical problem to be solved by the embodiments of the present application is to provide an LED driving power based on 2.4 G remote controlling adjustment which could realize stepless adjustment of brightness and color temperature and long remote control distance. 
     To solve the above technical problem, the embodiments of the present application provide an LED driving power supply based on 2.4 G remote controlling adjustment of brightness and color temperature, comprising an LED driving circuit, a main control circuit, a brightness adjustment circuit and a color temperature adjustment circuit; wherein, 
     the LED driving circuit, connected between the output end of the AC power supply and the LED light source, and the LED light source comprises at least two sets of LED lamp strings with different color temperatures connected in parallel; 
     the brightness adjustment circuit, connected to the LED driving circuit, for adjusting a current input to the LED light source by the LED driving circuit according to a first input PWM signal; 
     the color temperature adjustment circuit, connected to a loop of the LED driving circuit and the LED light source, for adjusting a current input to each LED lamp string according to a second input PWM signal; 
     the main control circuit, the main control circuit integrates a 2.4 G wireless transceiver module and is connected to a 0-10V dimmer, and according to a brightness adjustment and/or color temperature adjustment signal from the 2.4 G wireless transceiver module or a brightness adjustment signal from the 0-10V dimmer, the main control circuit respectively outputs the first and second input PWM signals to the brightness adjustment circuit and/or the color temperature adjustment circuit to control the operation of both. Based on the above design, the main control circuit integrated with a 2.4 G wireless transceiver module is added on the basis of retaining a conventional 0-10V dimmer, and could be connected with an external controller through a 2.4 G RF signal, and according to a brightness adjustment instruction and/or a color temperature adjustment instruction from the external controller, the main control circuit outputs PWM signal to the brightness adjustment circuit and/or the color temperature adjustment circuit, to realize the stepless adjustment of brightness and the stepless adjustment of color temperature of multiple LED lamps. 
     A further technical solution is: the LED driving circuit comprises AC/DC constant voltage circuit and a Buck step-down constant current circuit; wherein the AC/DC constant voltage circuit comprises a rectifier and filter circuit and a constant voltage circuit sequentially connected between the output end of the AC power supply and the Buck step-down constant current circuit; wherein the Buck step-down constant current circuit comprises a driving chip, an inductor, a first capacitor, a first resistor, and a first transistor, a first diode, a second diode and a short-circuit protection circuit; wherein, an input pin of the driving chip is connected to an output end of the brightness adjustment circuit, and an output pin of the driving chip is connected to one end of the inductor, and the other end of the inductor is connected to an input end of the short-circuit protection circuit and one end of the first capacitor, and the other end of the first capacitor is connected to an output of the short-circuit protection circuit and an anode of the second diode, and the one end of the first capacitor connected to the inductor is being as a positive output of the LED driving circuit, and the other end of the first capacitor is being as a negative output of the LED driving circuit, and one end of the first resistor is connected to a driving pin of the driving chip, and the other end of the first resistor is connected to a gate of the first transistor and a cathode of the first diode, and a drain of the first transistor is connected to the positive output of the constant voltage circuit, and a source of the second transistor, a cathode of the second diode and an anode of the first diode are all connected to ground; wherein the positive output of the LED driving circuit is connected to an anode of the LED lamp strings. 
     A further technical solution is: the LED driving power supply further comprises a power switch connected between the output end of the AC power supply and the LED driving circuit, and a power switch detecting circuit for detecting the working state of the power switch, and the main control circuit obtains a voltage of an output end of the power switch detecting circuit to adjust the color temperature of the LED lamp strings. 
     A further technical solution is: the power switch detecting circuit comprises a secondary winding coupled to a primary winding of a transformer of the constant voltage circuit, and a third diode, a second capacitor, a second resistor, a third resistor, a third capacitor, and a fourth resistor and a second transistor; wherein, a dotted terminal of the secondary winding is connected to an anode of the third diode, and a cathode of the third diode is connected to one end of the second capacitor and one end of the second resistor, and the other end of the second resistor is connected to one end of the third resistor, one end of the third capacitor and one end of the fourth resistor, and the other end of the fourth resistor is connected to a gate of the second transistor, and a drain of the second transistor is connected to the main control circuit, and a heteronymous terminal of the secondary winding is connected to the other end of the second capacitor, the other end of the third resistor, the other end of the third capacitor and a source of the second transistor, and is also connected to the negative output of the LED driving circuit. 
     A further technical solution is: the brightness adjustment circuit comprises a photocoupler, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fourth capacitor and a fifth capacitor; wherein, one end of the sixth resistor is connected to the main control circuit, and the other end of the sixth resistor is connected to an anode of a light-emitting diode of the photocoupler, a cathode of the light-emitting diode of the photocoupler is connected to a negative output of the LED driving circuit, and one end of the seventh resistor is connected to an emitter of a phototransistor of the photocoupler, and the other end of the seventh resistor is connected to one end of the fourth capacitor and one end of the eighth resistor, and the other end of the eighth resistor is connected to one end of the fifth capacitor and the LED driving circuit, and the other end of the fourth capacitor and the other end of the fifth capacitor are both connected to ground, and a collector of the phototransistor of the photocoupler is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to a power supply. 
     A further technical solution is: the brightness adjustment circuit further comprises a voltage stabilizing circuit, wherein the voltage stabilizing circuit comprises a triple pin regulator and a ninth resistor, and a cathode and a reference electrode of the triple pin regulator and one end of the ninth resistor are all connected to the emitter of the phototransistor of the photocoupler, and an anode of the triple pin regulator and the other end of the ninth resistor are both connected to the ground. 
     A further technical solution is: the color temperature adjustment circuit comprises at least two switching circuits, and the switching circuits are all connected to the main control circuit, and each switching circuit is correspondingly connected to one LED lamp string. 
     A further technical solution is: the LED light source comprises two set of LED lamp strings with different color temperatures connected in parallel; accordingly, the color temperature adjustment circuit comprises two switching circuits, and one switching circuit is connected to the main control circuit, and the other switching circuit is connected to the main control circuit through a flip circuit, and each switching circuit is connected to an LED lamp string; wherein, the flip circuit comprises a tenth resistor and a third transistor, and one end of the tenth resistor and a base of the third transistor are both connected to the main control circuit, and a collector of the third transistor is connected to an input end of the corresponding switching circuit, and an emitter of the third transistor and the other end of the tenth resistor are both connected to a negative output of the LED driving circuit. 
     A further technical solution is: the switching circuit comprises a driving chip, an eleventh resistor, a twelfth resistor, a fourth transistor and an electrolytic capacitor; wherein, an input pin of the driving chip is connected to the main control circuit, and an output pin of the driving chip is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to one end of the twelfth resistor and a gate of the fourth transistor, and a drain of the fourth transistor is connected to a cathode of the LED lamp string and a cathode of the electrolytic capacitor, and an anode of the electrolytic capacitor is connected to a positive output of the LED driving circuit, and a source of the fourth transistor and the other end of the twelfth resistor are both connected to a negative output of the LED driving circuit; wherein, the positive output of the LED driving circuit is connected to an anode of the LED lamp string. 
     A further technical solution is: the switching circuit further comprises a filter capacitor, and one end of the filter capacitor is connected to the source of the fourth transistor, and the other end of the filter capacitor is connected to the cathode of the electrolytic capacitor. 
     Compared with the prior art, the embodiments of the present application could realize the brightness adjustment and the color temperature adjustment to the LED driving power supply of the present application through 2.4 G remote control, that is, the main control circuit integrates a 2.4 G wireless transceiver module, and could connect with an external controller through the 2.4 G RF signal. According to a brightness adjustment instruction and/or a color temperature adjustment instruction from the external controller, the main control circuit outputs the PWM signal to the brightness adjustment circuit and/or the color temperature adjustment circuit, to realize a stepless adjustment of brightness and a stepless adjustment of color temperature of multiple LED lamps. The present application remains the traditional 0-10V dimmer, so the present application could also control the luminous intensity of LED lamp strings according to the change of the voltage of the 0-10V dimmer to realize the brightness adjustment function of the LED, which could meet the needs of different users and facilitate the daily use of consumers. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a circuit block diagram of the LED driving power supply based on 2.4 G remote controlling adjustment of brightness and color temperature according to an embodiment of the present application. 
         FIG. 2  is a specific circuit block diagram of the LED driving circuit of the present application. 
         FIG. 3  is a specific circuit diagram of the main control circuit, the brightness adjustment circuit, Buck step-down constant current circuit in the LED driving circuit, and the color temperature circuit of the present application. 
         FIG. 4  is a specific circuit diagram of a power switch detecting circuit of the present application. 
     
    
    
     DETAILED DESCRIPTION 
     In order that person skilled in the art could more clearly understand the purpose, technical solutions and advantages of the present application, the present application will be further described below with reference to the accompanying drawings and embodiments. 
     Referring to  FIG. 1  to  FIG. 4 ,  FIG. 1  to  FIG. 4  show an embodiment of the LED driving power supply  10  based on 2.4 G remote controlling adjustment of brightness and color temperature according to the present application. In the embodiment shown by the drawings, the LED driving power supply  10  comprises an LED driving circuit  101 , a main control circuit  102 , a brightness adjustment circuit  103 , and a color temperature adjustment circuit  104 , wherein, the LED driving circuit  101  is connected between the output end of AC power supply and an LED light source  12 , and the LED light source  12  comprises at least two sets of LED lamp strings with different color temperatures connected in parallel. The brightness adjustment circuit  103  is connected to the LED driving circuit  101 , for adjusting the current input to the LED light source  12  by the LED driving circuit  101  according to an input PWM signal, so as to control the emitting brightness of the LED light source  12 . The color temperature adjustment circuit  104  is connected to a loop of the LED driving circuit  101  and the LED light source  12 , for adjusting the current input to each LED lamp string according to an input PWM signal, so as to control the color temperature of the LED light source  12 . The main control circuit  102  integrates a 2.4 G wireless transceiver module and is connected to a 0-10V dimmer  11 , and according to a brightness adjustment and/or color temperature adjustment signal from the 2.4 G wireless transceiver module or a brightness adjustment signal from the 0-10V dimmer, the main control circuit  102  respectively outputs the PWM signal to the brightness adjustment circuit  103  and/or the color temperature adjustment circuit  104  to control the operation of both. Preferably, in the present embodiment, the main control circuit  102  is implemented based on a BK2461 MCU chip U 10 . Understandably, the main control circuit  102  is connected with an external controller through a 2.4 G RF signal. Preferably, the external controller is an RK419 remote controller; that is, the remote controller is connected with the LED driving power supply  10  through a 2.4 G RF signal, to control the multiple parallel connected LED lamp strings, so as to realize the wireless control/wireless packet control of multiple LED lamps. 
     In some embodiments, the LED driving circuit  101  comprises AC/DC constant voltage circuit  1010  and a Buck step-down constant current circuit  1015 . Preferably, the AC/DC constant voltage circuit  1010  is an existing flyback switching power supply circuit, for converting AC power into constant-voltage DC power, which comprises a rectifier and filter circuit  1011  and a constant voltage circuit  1012  sequentially connected between the output end of AC power supply and the Buck step-down constant current circuit  1015 . The Buck step-down constant current circuit  1015  is used to provide a stable constant current drive for the LED light source  12  and comprises a driving chip U 1 , an inductor L 3 , a capacitor C 3 , a resistor R 27 , and a transistor Q 2 , a diode D 16 , a diode D 18 , and a short-circuit protection circuit  1013 . Wherein, an input pin (pin  4 , pin ACTL) of the driving chip U 1  is connected to the output end of the brightness adjustment circuit  103 , and an output pin of the driving chip U 1  (pin  6 , pin SENSE) is connected to one end of the inductor L 3 , and the other end of the inductor L 3  is connected to the input end of the short-circuit protection circuit  1013  and one end of the capacitor C 3 , and the other end of the capacitor C 3  is connected to the output of the short-circuit protection circuit  1013  and the anode of the diode D 18 , and the one end of the capacitor C 3  connected to the inductor L 3  is being as the positive output OUT+ of the LED driving circuit  101 , and the other end of the capacitor C 3  is being as the negative output OUT− of the LED driving circuit  101 , and one end of the resistor R 27  is connected to a driving pin (pin  3 , pin GATE) of the driving chip U 1 , and the other end of the resistor R 27  is connected to the gate of the transistor Q 2  and the cathode of the diode D 16 , and the drain of the transistor Q 2  is connected to the positive output V+ of the constant voltage circuit  1012  of the AC/DC constant voltage circuit  1010 . Preferably, the drain of the transistor Q 2  could also be connected to the positive output OUT+ of the LED driving circuit  101  through a capacitor C 20 . The source of the transistor Q 2 , the cathode of the diode D 18  and the anode of the diode D 16  are all connected to ground; wherein the positive output OUT+ of the LED driving circuit  101  is connected to the anode of the LED lamp strings. Preferably, the model of the driving chip U 1  is RT8458. 
     In the present embodiment, the short-circuit protection circuit  1013  comprises a resistor R 68 , a resistor R 66 , and a zener diode ZD 1 , and one end of the resistor R 68  is connected to the positive output OUT+ of the LED driving circuit  101 , and the other end is connected to one end of the resistor R 66  and the cathode of the zener diode ZD 1 . The other end of the resistor R 66  and the anode of the zener diode ZD 1  are both connected to the negative output OUT− of the LED driving circuit  101 . In the present embodiment, the cathode of the zener diode ZD 1  is set as the short-circuit detection point A 1 , and the MCU U 10  detects the voltage of the point A 1 . 
     In some embodiments, the Buck step-down constant current circuit  1015  further comprises a sampling circuit  1014 . The sampling circuit  1014  comprises at least one sampling resistor. One end of the sampling resistor is connected to an output pin (pin  6 , pin SENSE) of the driving chip U 1 , and the other end of the sampling resistor is connected to the ground. As can be seen from the figures, in the present embodiment, the sampling circuit  1014  comprises five sampling resistors, that&#39;s a resistor R 38 , a resistor R 39 , a resistor R 40 , a resistor R 41  and a resistor R 63 . Understandably, in some other embodiments, the number and the resistor parameters of the sampling resistors may be set according to actual requirements. 
     In some embodiments, the brightness adjustment circuit  103  comprises a photocoupler, a resistor R 26 , a resistor R 34 , a resistor R 35 , a resistor R 36 , a capacitor C 14  and a capacitor C 15 ; wherein, one end of the resistor R 34  is connected to an output pin (pin  21 ) of the MCU U 10  of the main control circuit  102 , and the output pin (pin  21 ) is set as the pin PWM 2 , and the other end of the resistor R 34  is connected to the anode of the light-emitting diode of the photocoupler, the cathode of the light-emitting diode of the photocoupler is connected to the negative output OUT− of the LED driving circuit  101 , and one end of the resistor R 35  is connected to an emitter of the phototransistor of the photocoupler, and the other end of the resistor R 35  is connected to one end of the capacitor C 14  and one end of the resistor R 36 , and the other end of the resistor R 36  is connected to one end of the capacitor C 15  and an input pin (pin  4 , pin ACTL) of the driving chip U 1  of the LED driving circuit  101 , and the other end of the capacitor C 14  and the other end of the capacitor C 15  are both connected to the ground, and a collector of the phototransistor of the photocoupler is connected to one end of the resistor R 26 , and the other end of the resistor R 26  is connected to the power supply VCC, and the power supply VCC is provided by the LED driving circuit  101 . Based on the above design, the resistor R 35 , the resistor R 36 , the capacitor C 14  and the capacitor C 15  constitute a filter circuit, and after receiving the brightness adjustment signal of the external controller, the main control circuit  102  of the present application changes the duty cycle of the pin PWM 2  connected to the brightness adjustment circuit  103 , and the effective value of the filter circuit could be changed, thereby changing the voltage of the pin ACTL of the driving chip U 1  of the LED driving circuit  101  connected to the output end of the filter circuit, thereby changing the current input to the LED lamp string, so as to achieve the brightness adjustment of the LED light source  12 . 
     In the present embodiment, the brightness adjustment circuit  103  further comprises a voltage stabilizing circuit  1031 . The voltage stabilizing circuit  1031  comprises a triple pin regulator U 3  and a resistor R 33 . The cathode (pin  2 ) and the reference electrode (pin  1 ) of the triple pin regulator U 3  and one end of the resistor R 33  are all connected to the emitter of the phototransistor of the photocoupler, and the anode (pin  3 ) of the triple pin regulator U 3  and the other end of the resistor R 33  are both connected to the ground. In some embodiments, the brightness adjustment circuit  103  further comprises a capacitor C 13  and a resistor R 37 . One end of the capacitor C 13  is connected to the collector of the phototransistor of the photocoupler, and one end of the resistor R 37  is connected between the resistor R 36  and the capacitor C 15 , and the other end of the capacitor C 13  and the other end of the resistor R 37  are both connected to the ground. Preferably, the model of the triple pin regulator U 3  is TL431. 
     It can be known that the present application could use the 0-10V dimmer to adjust the brightness of the lamp, and could also use an external remote controller to adjust the brightness. When a 0-10V dimmer is used to adjust the brightness, by adjusting the 0-10V dimmer, the output voltage of the 0-10V dimmer circuit could be changed, and the MCU U 10  detects the output voltage to adjust the duty cycle of the pin PWM 2  connected to the brightness adjustment circuit, thereby changing the current input to the LED lamp string; and when an external remote controller is used to adjust the brightness, the MCU U 10  receives the brightness adjustment signal from the 2.4 G remote controller. After decoding, the MCU U 10  directly adjusts the duty cycle of the pin PWM 2  connected to the brightness adjustment circuit according to the decoded information, thereby changing the current input to the LED lamp string. 
     In the embodiment shown in the drawings, the LED light source  12  is composed of two set of LED lamp strings with different color temperatures connected in parallel. Accordingly, the color temperature adjustment circuit  104  comprises two switching circuits  1041 . The structure of each switching circuit  1041  is the same, and a switching circuit  1041  is correspondingly connected to an LED lamp string, and adjusting the conduction duty cycle of each switching circuit  1041  to adjust the current input to each LED lamp string could achieve color temperature adjustment of the LED light source  12 . The switching circuit  1041  comprises a driving chip, an eleventh resistor, a twelfth resistor, a fourth transistor, an electrolytic capacitor and a filter capacitor. The input pin (pin  6 ) of the driving chip is connected to an output pin (pin  19 ) of the main control circuit  102 , and the output pin (pin  19 ) is set as the pin PWM 1 , and an output pin of the driving chip is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to one end of the twelfth resistor and the gate of the fourth transistor, and the drain of the fourth transistor is connected to the cathode of the LED lamp string, one end of the filter capacitor and the cathode of the electrolytic capacitor, and the anode of the electrolytic capacitor is connected to the positive output OUT+ of the LED driving circuit  101 , and the source of the fourth transistor, the other end of the filter capacitor and the other end of the twelfth resistor are all connected to the negative output OUT− of the LED driving circuit  101 . Preferably, the model of the driving chip of the present embodiment is MX321. Preferably, in the present embodiment, the switching circuit  1041  further comprises a thirteenth resistor, and the input pin (pin  6 ) of the driving chip is connected to the pin PWM 1  of the main control circuit  102  through the thirteenth resistor. Based on the design, when the duty cycle of the pin PWM 1  of the main control circuit  102  increases, the conduction duty cycle of the fourth transistor of the switching circuit  1041  connected to the pin PWM 1  decreases, and then the current flowing through the LED lamp string connected to the switching circuit  1041  decreases, so the lamp beads of the LED lamp string become darkened, and the adjustment of the duty cycle of the pin PWM 1  is a linear adjustment, and the range of the adjustment is 0-100%, therefore, the brightness of the LED lamp string changes very smoothly, which could achieve linear stepless adjustment of color temperature. 
     In some embodiments, the ground pin (pin  5  and pin  2 ) of the driving chip is connected to the negative output OUT− of the LED driving circuit  101 , and the power supply pin (pin  1 ) of the driving chip is connected to the negative output OUT− of the LED driving circuit  101  through a capacitor, and the power supply pin (pin  1 ) is also connected to the power supply VDD. 
     Specifically, as shown in  FIG. 3 , in the present embodiment, one switching circuit  1041  comprises a driving chip U 8 , a resistor R 64 , a resistor R 29 , a resistor R 49 , a transistor Q 4 , a filter capacitor C 26  and an electrolytic capacitor E 6 . The drain of the transistor Q 4  is connected to the cathode of one set of LED lamp string (e.g., LED  1 ). One end of the resistor R 29  is connected to an output pin (pin  3 ) of the U 8 , and the power supply pin (pin  1 ) of the driving chip U 8  is connected to the negative output OUT− of the LED driving circuit  101  through an capacitor C 18 . The other switching circuit  1041  comprises a driving chip U 9 , a resistor R 65 , a resistor R 30 , a resistor R 67 , a transistor Q 5 , a capacitor C 27  and an electrolytic capacitor E 7 . The drain of the transistor Q 5  is connected to the cathode of the other set of LED lamp string (e.g., LED  2 ). One end of the resistor R 30  is connected to an output pin (pin  3 ) of the U 9 , and the power supply pin (pin  1 ) of the driving chip U 9  is connected to the negative output OUT− of the LED driving circuit  101  through a capacitor C 19 . 
     Preferably, the color temperature adjustment circuit  104  further comprises a flip circuit  1042 . The flip circuit  1042  comprises a resistor R 61  and a transistor Q 7 . One end of the resistor R 61  and a base of the transistor Q 7  are both connected to the pin PWM 1  of the main control circuit  102  through the resistor R 65 , and a collector of the transistor Q 7  is connected to the input pin (pin  6 ) of the driving chip U 9  of the corresponding switching circuit  1041 , and an emitter of the transistor Q 7  and the other end of the resistor R 61  are both connected to the negative output OUT− of the LED driving circuit  101 . In the present embodiment, the collector of the transistor Q 7  is also connected to a power supply of 3.3V through a resistor R 62 . Based on the above design, after receiving the color temperature adjustment signal from an external controller, the main control circuit  102  changes the duty cycle of the pin PWM 1 , and one signal of the pin PWM 1  is used to drive the transistor Q 4  through the driving chip U 8 , and another signal of the pin PWM 1  is flipped by the transistor Q 7  of the flip circuit  1042  and then is used to drive the transistor Q 5  through the driving chip U 9 , so the output of the transistor Q 4  and the output of the transistor Q 5  are kept in a complementary state, so as to keep the output power constant in the process of adjusting the color temperature; when the duty cycle of the pin PWM 1  increases, the conduction duty cycle of the transistor Q 4  decreases and the conduction duty cycle of the transistor Q 5  increases, then the effective value of the current flowing through the LED  1  decreases and the lamp beads of the LED  1  become darkened, and the effective value of the current flowing through the LED  2  increases and the LED beads in LED  2  become brighter. 
     Person skilled in the art could understand that, in other embodiments, when the LED light source  12  comprises multiple sets of LED lamp strings with different color temperatures, accordingly, the number of the switching circuit  1041  of the color adjustment circuit  104  is set to be the same as the number of LED lamp strings, so that one switching circuit  1041  is correspondingly connected to one set of LED lamp string, and all the switching circuits  1041  are connected to the main control circuit  102 , so that the main control circuit  102  could use the switching circuit  1041  to control the current flowing into the LED lamp string corresponding connected to the switching circuit, so as to adjust the color temperature of the LED light source  12 . 
     Understandably, if the LED light source  12  comprises a first set of LED lamp string with a color temperature of 6000K and a second set of LED lamp string with a color temperature of 3000K. The color temperature adjustment circuit  104  comprises two switching circuits  1041 , that&#39;s a first switching circuit and a second switching circuit. The first switching circuit is connected to the first set of LED lamp string, and the second switching circuit is connected to the second set of LED lamp string. If the fourth transistor of the first switching circuit is turned on, the light emitted by the LED light source  12  is white light with color temperature of 6000K; if the fourth transistor of the second switching circuit is turned on, the second set of LED lamp string emits light and the light emitted by the LED light source  12  is yellow light with color temperature of 3000K; if both of the fourth transistor of the first switching circuit and the fourth transistor of the second switching circuit are turned on, both of the first set of LED lamp string and the second set of LED lamp string emit light, and at this time, the light emitted by the LED light source  12  is similar to sunlight with color temperature of 4500K obtained by mixing 6000K and 3000K; if the conduction duty cycle of the fourth transistor of the first switching circuit and the conduction duty cycle of the fourth transistor of the second switching circuit are different, the light brightness of the first set of LED lamp string and the light brightness of the second set of LED lamp string are different, thereby changing the color temperature of the LED light source  12 . Similarly, if there are multiple sets of LED lamp strings with different color temperatures, the color temperature adjustment circuit  104  comprises multiple of switching circuits  1041  with the number same as the LED lamp strings, and multiple sets of LED lamp strings with different color temperatures could constitute many different combinations, so as to obtain many different color temperatures. 
     In the present embodiment, the LED driving power supply  10  further comprises a power switch S connected between the output end of the AC power supply and the LED driving circuit  101 , and a power switch detecting circuit  105  for detecting the working state of the power switch S. The main control circuit  102  obtains the voltage of an output end of the power switch detecting circuit  105  to adjust the color temperature of the LED lamp strings. Preferably, the power switch detecting circuit  105  comprises a secondary winding coupled to a primary winding of a transformer (i.e., a transformer connected to a PWM controller through a MOS transistor in a flyback switching power supply circuit) of the constant voltage circuit  1012 , and a diode D 13 , a capacitor C 9 , a resistor R 21 , a resistor R 22 , a capacitor C 11 , and a resistor R 23  and a transistor Q 1 , which are all connected to the secondary winding; wherein, a dotted terminal of the secondary winding is connected to the anode of the diode D 13 , and the cathode of the diode D 13  is connected to one end of the capacitor C 9  and one end of the resistor R 21 , and the other end of the resistor R 21  is connected to one end of a resistor R 22 , one end of the capacitor C 11  and one end of the resistor R 23 , and the other end of the resistor R 23  is connected to a gate of the transistor Q 1 , and a drain of the transistor Q 1  (set as the pin A 3 ) is connected to an input pin (pin  10 ) of the MCU U 10  of the main control circuit  102 , and a heteronymous terminal of the secondary winding is connected to the other end of the capacitor C 9 , the other end of the resistor R 22 , the other end of the capacitor C 11  and the source of the transistor Q 1 , and is also connected to the negative output OUT− of the LED driving circuit  101 . In some embodiments, the power switch detecting circuit  105  further comprises a diode D 15  and an electrolytic capacitor E 5 . The anode of the diode D 15  is connected to the dotted terminal of the secondary winding, and the cathode of the diode D 15  is connected to the anode of the electrolytic capacitor E 5 , and the cathode of the electrolytic capacitor E 5  is connected to the heteronymous terminal of the secondary winding. Based on the design, the main control circuit  102  could change the duty cycle of the pin PWM 1  connected to the color temperature circuit  104  by detecting the state of the power switch S, so as to adjust the color temperature of the lamp string. That is, the MCU U 10  changes the duty cycle of the pin PWM 1  connected to the color temperature circuit  104  by detecting the output of the drain (pin A 3 ) of the transistor Q 1 ; D 13 , C 9 , R 21 , R 22 , C 11 , and R 23  form an RC charge and discharge circuit, and due to the charge and discharge characteristics of the capacitor, when the power switch S is opened and then is closed within 5 seconds, the charge at two ends of the capacitor C 11  is not completely discharged, thereby existing voltage, to make the transistor Q 1  be turned on. If the MCU U 10  detects that the output of the drain of the transistor Q 1  is a low level, the MCU U 10  changes the effective value of the current flowing through the LED lamp string by changing the duty cycle of the pin PWM 1 , so as to change the color temperature; when the power switch S is opened and then is not closed within 5 seconds, the charge at two ends of the capacitor C 11  is completely discharged, and at the moment of power on again, the capacitor C 11  is charged through the resistor R 21 , and the charge time is about 3 seconds, however, the MCU U 10  will detect the output of the drain of the transistor Q 1  upon power on, and the output of the drain of the transistor Q 1  is a high level at the moment of power on, therefore, the MCU U 10  will not switch the color temperature of the LED lamp string, but keep the color temperature as that before power off. 
     In summary, the present application realizes the brightness adjustment and color temperature adjustment of the LED driving power supply of the present application through 2.4 G remote control, that is, the main control circuit integrates a 2.4 G wireless transceiver module, and could connect with the external controller through the 2.4 G RF signal, and according to the brightness adjustment instruction and/or the color temperature adjustment instruction from the external controller, the main control circuit outputs the PWM signal to the brightness adjustment circuit and/or the color temperature adjustment circuit, to realize the stepless adjustment of brightness and the stepless adjustment of color temperature of the multiple LED lamps. The present application remains the traditional 0-10V dimmer, so the present invention could also control the luminous intensity of LED lamp strings according to the change of the voltage of the 0-10V dimmer to realize the brightness adjustment function of the LED, and could also adjust the color temperature of the LED light source by controlling the switching time of the power switch, which could meet the needs of different users and facilitate the daily use of consumers. 
     The above description is only preferred embodiments of the present application, and does not impose any limitation to the present application. Person skilled in the art may make various equivalent alterations and improvements on the basis of the above embodiments, and all equivalent changes or modifications made within the scope of the claims shall fall into the protection scope of the present application.