Power supply switching circuit of generator set

Abstract

The invention discloses a power supply switching circuit of a generator set, and relates to the field of power supply, and the power supply switching circuit of the generator set comprises a battery combination module which is used for setting three batteries, two batteries are connected in series to supply power to a motor through a final power supply module, and the other battery independently supplies power to a motor power supply control system through the final power supply module; and the voltage detection control module is used for detecting the voltages of the three batteries, and when the voltage of a single battery is lower than a threshold value, the other two batteries are controlled to form a traditional power supply structure of the power generator, and the beneficial effects are that the battery combination module is provided with the three batteries, one battery supplies power to the motor power supply control system, and the other battery supplies power to the other battery. The other two batteries are connected in series to supply power to the motor, so that the influence on power supply caused by excessive energy consumption of a single battery is avoided; when the voltage detection control module detects that the battery combination module is insufficient in battery power supply, battery connection of the battery combination module is controlled, a traditional generator power supply structure is changed, and power generation is maintained.

Description

Technical Field

[0001] The present invention relates to the field of power supply, and specifically to a power supply switching circuit for a generator set. Background Art

[0002] The traditional power supply structure of a generator is as Figure 1 shown. The working power supply of the motor in the generator is 24V, while the working voltage of the motor power supply control system (which controls the rotation of the motor and feeds back signals to make the power generation stable) is 12V. Therefore, two 12V batteries are often used as power sources. The 24V voltage obtained after the two batteries are connected in series powers the motor, and a single 12V battery powers the motor power supply control system.

[0003] Since there is a battery E4 that powers both the motor and the motor power supply control system, the electric energy is consumed faster than that of the battery E5. The battery E4 will be the first to have insufficient power supply, and the insufficient power supply of the battery E4 will cause the voltage of both the motor and the motor power supply control system to be too low, affecting power generation, and improvement is needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a power supply switching circuit for a generator set to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A power supply switching circuit for a generator set, comprising: A battery combination module, used to set three batteries. Two batteries are connected in series and supply power to the motor through a final power supply module, and the other battery supplies power to the motor power supply control system alone through the final power supply module; A voltage detection and control module, used to detect the voltages of the three batteries. When the voltage of a single battery is lower than a threshold, it will control the other two batteries to form a traditional generator power supply structure and supply power to the motor and the motor power supply control system through the final power supply module; A final power supply module, used to supply power to the motor and the motor power supply control system after power-on delay; The first output end of the battery combination module is connected to the input end of the voltage detection and control module, the second output end of the battery combination module is connected to the first input end of the final power supply module, the first output end of the voltage detection and control module is connected to the input end of the battery combination module, and the second output end of the voltage detection and control module is connected to the second input end of the final power supply module.

[0006] As a further solution of the present invention: The battery combination module includes a first battery, a second battery, and a third battery. The positive electrode of the first battery is connected to the common point A1, the D pole of the third MOS transistor, the D pole of the sixth MOS transistor, and the D pole of the ninth MOS transistor. The G pole of the third MOS transistor is connected to the common point B11, the S pole of the third MOS transistor is connected to the D pole of the second MOS transistor, the G pole of the second MOS transistor is connected to the common point B21, the S pole of the second MOS transistor is connected to the D pole of the first MOS transistor, the G pole of the first MOS transistor is connected to the common point B32, the S pole of the first MOS transistor is connected to the voltage VDD, the G pole of the sixth MOS transistor is connected to the common point B11, the S pole of the sixth MOS transistor is connected to the D pole of the fifth MOS transistor, the G pole of the fifth MOS transistor is connected to the common point B22, the S pole of the fifth MOS transistor is connected to the D pole of the fourth MOS transistor, the G pole of the fourth MOS transistor is connected to the common point B31, the S pole of the fourth MOS transistor is connected to the voltage VDD, the G pole of the ninth MOS transistor is connected to the common point B11, the S pole of the ninth MOS transistor is connected to the D pole of the eighth MOS transistor, the G pole of the eighth MOS transistor is connected to the common point B21, the S pole of the eighth MOS transistor is connected to the D pole of the seventh MOS transistor, the G pole of the seventh MOS transistor is connected to the common point B31, and the S pole of the seventh MOS transistor is connected to the voltage VCC; The negative electrode of the first battery is connected to the D pole of the tenth MOS transistor and the D pole of the eleventh MOS transistor. The G pole of the tenth MOS transistor is connected to the common point B31, the G pole of the eleventh MOS transistor is connected to the common point B32, the S pole of the tenth MOS transistor is connected to the D pole of the seventeenth MOS transistor and the D pole of the twentieth MOS transistor. The G pole of the seventeenth MOS transistor is connected to the common point B11, the S pole of the seventeenth MOS transistor is connected to the D pole of the eighteenth MOS transistor, the G pole of the eighteenth MOS transistor is connected to the common point B21, the S pole of the eighteenth MOS transistor is connected to the D pole of the nineteenth MOS transistor, the G pole of the nineteenth MOS transistor is connected to the common point B31, the S pole of the nineteenth MOS transistor is grounded, the G pole of the twentieth MOS transistor is connected to the common point B11, the S pole of the twentieth MOS transistor is connected to the D pole of the twenty-first MOS transistor, the G pole of the twenty-first MOS transistor is connected to the common point B22, the S pole of the twenty-first MOS transistor is connected to the D pole of the twenty-second MOS transistor, the G pole of the twenty-second MOS transistor is connected to the common point B31, and the S pole of the twenty-second MOS transistor is connected to the common point A3; The S pole of the eleventh MOS transistor is connected to the D pole of the twelfth MOS transistor, the D pole of the fourteenth MOS transistor, the positive pole of the second battery, and the common point A2. The G pole of the twelfth MOS transistor is connected to the common point B31. The S pole of the twelfth MOS transistor is connected to the D pole of the thirteenth MOS transistor. The G pole of the thirteenth MOS transistor is connected to the common point B21. The S pole of the thirteenth MOS transistor is connected to the voltage VDD. The G pole of the fourteenth MOS transistor is connected to the common point B32. The S pole of the fourteenth MOS transistor is connected to the D pole of the fifteenth MOS transistor. The G pole of the fifteenth MOS transistor is connected to the common point B21. The S pole of the fifteenth MOS transistor is connected to the D pole of the sixteenth MOS transistor. The G pole of the sixteenth MOS transistor is connected to the common point B11. The S pole of the sixteenth MOS transistor is connected to the voltage VCC. The negative pole of the second battery is connected to the D pole of the twenty-ninth MOS transistor and the D pole of the thirtieth MOS transistor. The G pole of the twenty-ninth MOS transistor is connected to the common point B31. The G pole of the thirtieth MOS transistor is connected to the common point B32. The S pole of the thirtieth MOS transistor is grounded. The S pole of the twenty-ninth MOS transistor is connected to the common point A3; The positive pole of the third battery is connected to the common point A3, the D pole of the twenty-fifth MOS transistor, and the D pole of the twenty-eighth MOS transistor. The negative pole of the third battery is grounded. The G pole of the twenty-fifth MOS transistor is connected to the common point B31. The S pole of the twenty-fifth MOS transistor is connected to the D pole of the twenty-fourth MOS transistor. The G pole of the twenty-fourth MOS transistor is connected to the common point B22. The S pole of the twenty-fourth MOS transistor is connected to the D pole of the twenty-third MOS transistor. The G pole of the twenty-third MOS transistor is connected to the common point B11. The S pole of the twenty-third MOS transistor is connected to the voltage VCC. The G pole of the twenty-eighth MOS transistor is connected to the common point B31. The S pole of the twenty-eighth MOS transistor is connected to the D pole of the twenty-seventh MOS transistor. The G pole of the twenty-seventh MOS transistor is connected to the common point B21. The S pole of the twenty-seventh MOS transistor is connected to the D pole of the twenty-sixth MOS transistor. The G pole of the twenty-sixth MOS transistor is connected to the common point B12. The S pole of the twenty-sixth MOS transistor is connected to the voltage VCC.

[0007] As a further solution of the present invention: The voltage detection and control module includes: A power supply control unit for supplying power to the first amplifier after power-on, supplying power to the third amplifier after the first time, supplying power to the second amplifier after the second time, and providing a trigger signal to the final power supply module after the third time; A magnitude judgment unit for respectively detecting whether the voltages of the first battery, the second battery, and the third battery are lower than a threshold value through the first amplifier, the second amplifier, and the third amplifier; when the battery voltage is lower than the threshold value, the corresponding amplifier outputs a low level, and when the battery voltage is higher than the threshold value, the corresponding amplifier outputs a high level; An inverting output unit is used to set that the fourth inverter, the fifth inverter, and the sixth inverter respectively correspond to the first amplifier, the second amplifier, and the third amplifier. The inverter inverts the output voltage signal of the corresponding amplifier and then outputs it. The first output terminal of the power supply control unit is connected to the second input terminal of the magnitude judgment unit. The second output terminal of the power supply control unit is connected to the second input terminal of the final power supply module. The first input terminal of the magnitude judgment unit is connected to the first output terminal of the battery combination module. The output terminal of the magnitude judgment unit is connected to the input terminal of the inverting output unit. The output terminal of the inverting output unit is connected to the input terminal of the battery combination module.

[0008] As a further solution of the present invention: The power supply control unit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a third diode, and a fourth diode. One end of the first resistor is connected to a 5V voltage, one end of the second resistor, and the power supply terminal of the first amplifier. The other end of the first resistor is connected to one end of the first capacitor and the negative electrode of the first diode. The other end of the first capacitor is grounded. The positive electrode of the first diode is connected to one end of the third resistor and the power supply terminal of the second amplifier. The other end of the third resistor is connected to one end of the third capacitor and the negative electrode of the third diode. The other end of the third capacitor is grounded. The positive electrode of the third diode is connected to the negative electrode of the fourth diode, one end of the fourth capacitor, and the second input terminal of the final power supply module. The positive electrode of the fourth diode is grounded. The other end of the fourth capacitor is grounded. The other end of the second resistor is connected to one end of the second capacitor and the negative electrode of the second diode. The other end of the second capacitor is grounded. The positive electrode of the second diode is connected to the power supply terminal of the third amplifier.

[0009] As a further solution of the present invention: The magnitude judgment unit includes a first amplifier, a second amplifier, and a third amplifier. The non-inverting input terminal of the first amplifier is connected to the common point A1. The inverting input terminal of the first amplifier is connected to the voltage VREF1. The output terminal of the first amplifier is connected to the common point B11. The non-inverting input terminal of the second amplifier is connected to the common point A2. The inverting input terminal of the second amplifier is connected to the voltage VREF2. The output terminal of the second amplifier is connected to the common point B21. The non-inverting input terminal of the third amplifier is connected to the common point A3. The inverting input terminal of the third amplifier is connected to the voltage VREF3. The output terminal of the third amplifier is connected to the common point B31.

[0010] As a further solution of the present invention: The inverting output unit includes a fourth inverter, a fifth inverter, and a sixth inverter. The input terminal of the fourth inverter is connected to the common point B11. The output terminal of the fourth inverter is connected to the common point B12. The input terminal of the fifth inverter is connected to the common point B21. The output terminal of the fifth inverter is connected to the common point B22. The input terminal of the sixth inverter is connected to the common point B31. The output terminal of the sixth inverter is connected to the common point B32.

[0011] As a further solution of the present invention: The final power supply module includes the thirty-first MOS transistor and the thirty-second MOS transistor. The D pole of the thirty-first MOS transistor is connected to the voltage VDD, the G pole of the thirty-first MOS transistor is connected to the second output terminal of the voltage detection and control module, the S pole of the thirty-first MOS transistor is connected to the motor, the D pole of the thirty-second MOS transistor is connected to the voltage VCC, the G pole of the thirty-second MOS transistor is connected to the second output terminal of the voltage detection and control module, and the S pole of the thirty-second MOS transistor is connected to the motor power supply control system.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The battery combination module of the present invention is provided with three batteries. One battery supplies power to the motor power supply control system, and the other two batteries are connected in series to supply power to the motor, avoiding excessive energy consumption of a single battery and affecting power supply. When the voltage detection and control module detects that the battery combination module has insufficient battery power supply, it will control the connection of the batteries in the battery combination module and change to the traditional generator power supply structure to maintain power generation. Description of the Drawings

[0013] Figure 1 Schematic diagram of power supply for a traditional generator set.

[0014] Figure 2 Schematic diagram of the principle of a power supply switching circuit for a generator set.

[0015] Figure 3 Circuit diagram of the battery combination module.

[0016] Figure 4 Circuit diagram of the voltage detection and control module and the final power supply module. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 2 , a power supply switching circuit for a generator set, including: The battery combination module 1 is used to set three batteries. Two batteries are connected in series and supply power to the motor through the final power supply module 3, and the other battery separately supplies power to the motor power supply control system through the final power supply module 3; The voltage detection and control module 2 is used to detect the voltages of the three batteries. When the voltage of a single battery is lower than the threshold, it will control the other two batteries to form a traditional generator power supply structure and supply power to the motor and the motor power supply control system through the final power supply module 3; The final power supply module 3 is used to supply power to the motor and the motor power supply control system after a power-on delay; The first output terminal of the battery combination module 1 is connected to the input terminal of the voltage detection and control module 2, the second output terminal of the battery combination module 1 is connected to the first input terminal of the final power supply module 3, the first output terminal of the voltage detection and control module 2 is connected to the input terminal of the battery combination module 1, and the second output terminal of the voltage detection and control module 2 is connected to the second input terminal of the final power supply module 3.

[0019] In this embodiment: Please refer to Figure 3 , the battery combination module 1 includes a first battery E1, a second battery E2, and a third battery E3. The positive electrode of the first battery E1 is connected to the common point A1, the D pole of the third MOS transistor V3, the D pole of the sixth MOS transistor V6, and the D pole of the ninth MOS transistor V9. The G pole of the third MOS transistor V3 is connected to the common point B11, the S pole of the third MOS transistor V3 is connected to the D pole of the second MOS transistor V2, the G pole of the second MOS transistor V2 is connected to the common point B21, the S pole of the second MOS transistor V2 is connected to the D pole of the first MOS transistor V1, the G pole of the first MOS transistor V1 is connected to the common point B32, the S pole of the first MOS transistor V1 is connected to the voltage VDD, the G pole of the sixth MOS transistor V6 is connected to the common point B11, the S pole of the sixth MOS transistor V6 is connected to the D pole of the fifth MOS transistor V5, the G pole of the fifth MOS transistor V5 is connected to the common point B22, the S pole of the fifth MOS transistor V5 is connected to the D pole of the fourth MOS transistor V4, the G pole of the fourth MOS transistor V4 is connected to the common point B31, the S pole of the fourth MOS transistor V4 is connected to the voltage VDD, the G pole of the ninth MOS transistor V9 is connected to the common point B11, the S pole of the ninth MOS transistor V9 is connected to the D pole of the eighth MOS transistor V8, the G pole of the eighth MOS transistor V8 is connected to the common point B21, the S pole of the eighth MOS transistor V8 is connected to the D pole of the seventh MOS transistor V7, the G pole of the seventh MOS transistor V7 is connected to the common point B31, and the S pole of the seventh MOS transistor V7 is connected to the voltage VCC; The negative electrode of the first battery E1 is connected to the D electrodes of the tenth MOS transistor V10 and the eleventh MOS transistor V11. The G electrode of the tenth MOS transistor V10 is connected to the common point B31, and the G electrode of the eleventh MOS transistor V11 is connected to the common point B32. The S electrode of the tenth MOS transistor V10 is connected to the D electrodes of the seventeenth MOS transistor V17 and the twentieth MOS transistor V20. The G electrode of the seventeenth MOS transistor V17 is connected to the common point B11, the S electrode of the seventeenth MOS transistor V17 is connected to the D electrode of the eighteenth MOS transistor V18, the G electrode of the eighteenth MOS transistor V18 is connected to the common point B21, the S electrode of the eighteenth MOS transistor V18 is connected to the D electrode of the nineteenth MOS transistor V19, the G electrode of the nineteenth MOS transistor V19 is connected to the common point B31, and the S electrode of the nineteenth MOS transistor V19 is grounded. The G electrode of the twentieth MOS transistor V20 is connected to the common point B11, the S electrode of the twentieth MOS transistor V20 is connected to the D electrode of the twenty-first MOS transistor V21, the G electrode of the twenty-first MOS transistor V21 is connected to the common point B22, the S electrode of the twenty-first MOS transistor V21 is connected to the D electrode of the twenty-second MOS transistor V22, the G electrode of the twenty-second MOS transistor V22 is connected to the common point B31, and the S electrode of the twenty-second MOS transistor V22 is connected to the common point A3; The S electrode of the eleventh MOS transistor V11 is connected to the D electrodes of the twelfth MOS transistor V12, the fourteenth MOS transistor V14, the positive electrode of the second battery E2, and the common point A2. The G electrode of the twelfth MOS transistor V12 is connected to the common point B31, the S electrode of the twelfth MOS transistor V12 is connected to the D electrode of the thirteenth MOS transistor V13, the G electrode of the thirteenth MOS transistor V13 is connected to the common point B21, the S electrode of the thirteenth MOS transistor V13 is connected to the voltage VDD, the G electrode of the fourteenth MOS transistor V14 is connected to the common point B32, the S electrode of the fourteenth MOS transistor V14 is connected to the D electrode of the fifteenth MOS transistor V15, the G electrode of the fifteenth MOS transistor V15 is connected to the common point B21, the S electrode of the fifteenth MOS transistor V15 is connected to the D electrode of the sixteenth MOS transistor V16, the G electrode of the sixteenth MOS transistor V16 is connected to the common point B11, the S electrode of the sixteenth MOS transistor V16 is connected to the voltage VCC. The negative electrode of the second battery E2 is connected to the D electrodes of the twenty-ninth MOS transistor V29 and the thirtieth MOS transistor V30. The G electrode of the twenty-ninth MOS transistor V29 is connected to the common point B31, the G electrode of the thirtieth MOS transistor V30 is connected to the common point B32, the S electrode of the thirtieth MOS transistor V30 is grounded, and the S electrode of the twenty-ninth MOS transistor V29 is connected to the common point A3; The positive electrode of the third battery E3 is connected to the common point A3, the D pole of the twenty-fifth MOS transistor V25, and the D pole of the twenty-eighth MOS transistor V28. The negative electrode of the third battery E3 is grounded. The G pole of the twenty-fifth MOS transistor V25 is connected to the common point B31. The S pole of the twenty-fifth MOS transistor V25 is connected to the D pole of the twenty-fourth MOS transistor V24. The G pole of the twenty-fourth MOS transistor V24 is connected to the common point B22. The S pole of the twenty-fourth MOS transistor V24 is connected to the D pole of the twenty-third MOS transistor V23. The G pole of the twenty-third MOS transistor V23 is connected to the common point B11. The S pole of the twenty-third MOS transistor V23 is connected to the voltage VCC. The G pole of the twenty-eighth MOS transistor V28 is connected to the common point B31. The S pole of the twenty-eighth MOS transistor V28 is connected to the D pole of the twenty-seventh MOS transistor V27. The G pole of the twenty-seventh MOS transistor V27 is connected to the common point B21. The S pole of the twenty-seventh MOS transistor V27 is connected to the D pole of the twenty-sixth MOS transistor V26. The G pole of the twenty-sixth MOS transistor V26 is connected to the common point B12. The S pole of the twenty-sixth MOS transistor V26 is connected to the voltage VCC.

[0020] When the voltages on the first battery E1, the second battery E2, and the third battery E3 are all higher than the threshold value, at this time, the common points B11, B21, and B31 are all at high level, and B12, B22, and B32 are all at low level. At this time, the negative electrode of the first battery E1 is grounded through the tenth MOS transistor V10, the seventeenth MOS transistor V17, the eighteenth MOS transistor V18, and the nineteenth MOS transistor V19. The positive electrode of the first battery E1 outputs the voltage VCC through the ninth MOS transistor V9, the eighth MOS transistor V8, and the seventh MOS transistor V7, that is, the voltage on the first battery E1 is used as the voltage VCC; the second battery E2 is connected in series with the third battery E3 through the twenty-ninth MOS transistor V29. The positive electrode of the second battery E2 outputs the voltage VDD through the twelfth MOS transistor V12 and the thirteenth MOS transistor V13, that is, the sum of the voltages on the second battery E2 and the third battery E3 is used as the voltage VDD. Here, the first battery E1 supplies power to the motor power control system, and the second battery E2 and the third battery E3 are connected in series to supply power to the motor, avoiding excessive energy consumption of a single battery and affecting power supply.

[0021] When the voltage of the first battery E1 is lower than the threshold value and the voltages of the second battery E2 and the third battery E3 are higher than the threshold value, at this time, the common points B12, B21, and B31 are all at high level, and B11, B22, and B32 are all at low level; the common point B11 is at low level, the third MOS transistor V3, the sixth MOS transistor V6, and the ninth MOS transistor V9 are all cut off, the first battery E1 does not output voltage, and the third battery E3 outputs voltage VCC through the twenty-eighth MOS transistor V28, the twenty-seventh MOS transistor V27, and the twenty-sixth MOS transistor V26. The second battery E2 and the third battery E3 are connected in series, and the positive electrode of the second battery E2 outputs voltage VDD through the twelfth MOS transistor V12 and the thirteenth MOS transistor V13; at this time, the power supply modes of the second battery E2 and the third battery E3 are the traditional generator power supply structures. The second battery E2 serves as both the power supply for the motor and the power supply for the motor power supply control system, and the third battery E3 only serves as the power supply for the motor. The power of the second battery E2 is consumed faster than that of the third battery E3. At the same time, the second battery E2 supplies power to two loads with different voltage magnitudes, resulting in power supply interference. Therefore, the traditional generator power supply structure is used as an emergency power supply mode.

[0022] When the voltage of the second battery E2 is lower than the threshold value and the voltages of the first battery E1 and the third battery E3 are higher than the threshold value, at this time, the common points B11, B22, and B31 are all at high level, and B12, B21, and B32 are all at low level; the first battery E1 is connected in series with the third battery E3 through the tenth MOS transistor V10, the twentieth MOS transistor V20, the twenty-first MOS transistor V21, and the twenty-second MOS transistor V22. The first battery E1 outputs voltage VDD through the sixth MOS transistor V6, the fifth MOS transistor V5, and the fourth MOS transistor V4; the third battery E3 outputs voltage VCC through the twenty-fifth MOS transistor V25, the twenty-fourth MOS transistor V24, and the twenty-third MOS transistor V23, which is also the traditional generator power supply structure.

[0023] When the voltage of the third battery E3 is lower than the threshold value and the voltages of the first battery E1 and the second battery E2 are higher than the threshold value, at this time, the common points B11, B21, and B32 are all at high level, and B12, B22, and B31 are all at low level; the negative electrode of the second battery E2 is grounded through the thirtieth MOS transistor V30, the positive electrode of the second battery E2 is connected to the negative electrode of the first battery E1 through the eleventh MOS transistor V11, and the positive electrode of the first battery E1 supplies voltage VDD through the third MOS transistor V3, the second MOS transistor V2, and the first MOS transistor V1. The positive electrode of the second battery E2 supplies voltage VCC through the fourteenth MOS transistor V14, the fifteenth MOS transistor V15, and the sixteenth MOS transistor V16, which is also the traditional generator power supply structure.

[0024] In another embodiment: Other types of switching transistors can be selected to replace the MOS transistors, such as triodes, IGBT transistors, etc.

[0025] In this embodiment: Refer to Figure 4 , the voltage detection and control module 2 includes: A power supply control unit, configured to supply power to the first amplifier U1 after power-on, supply power to the third amplifier U3 after a first period of time, supply power to the second amplifier U2 after a second period of time, and provide a trigger signal to the final power supply module 3 after a third period of time; A magnitude judgment unit, configured to respectively detect whether the voltages of the first battery E1, the second battery E2, and the third battery E3 are lower than a threshold through the first amplifier U1, the second amplifier U2, and the third amplifier U3; when the battery voltage is lower than the threshold, the corresponding amplifier outputs a low level, and when the battery voltage is higher than the threshold, the corresponding amplifier outputs a high level; An inverting output unit, configured to set the fourth inverter U4, the fifth inverter U5, and the sixth inverter U6 to correspond to the first amplifier U1, the second amplifier U2, and the third amplifier U3 respectively, and the inverter inverts and outputs the output voltage signal of the corresponding amplifier; The first output terminal of the power supply control unit is connected to the second input terminal of the magnitude judgment unit, the second output terminal of the power supply control unit is connected to the second input terminal of the final power supply module 3, the first input terminal of the magnitude judgment unit is connected to the first output terminal of the battery combination module 1, the output terminal of the magnitude judgment unit is connected to the input terminal of the inverting output unit, and the output terminal of the inverting output unit is connected to the input terminal of the battery combination module 1.

[0026] In this embodiment: Refer to Figure 4 , the power supply control unit includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. One end of the first resistor R1 is connected to a 5V voltage, one end of the second resistor R2, and the power supply terminal of the first amplifier U1. The other end of the first resistor R1 is connected to one end of the first capacitor C1 and the negative electrode of the first diode D1. The other end of the first capacitor C1 is grounded. The positive electrode of the first diode D1 is connected to one end of the third resistor R3 and the power supply terminal of the second amplifier U2. The other end of the third resistor R3 is connected to one end of the third capacitor C3 and the negative electrode of the third diode D3. The other end of the third capacitor C3 is grounded. The positive electrode of the third diode D3 is connected to the negative electrode of the fourth diode D4, one end of the fourth capacitor C4, and the second input terminal of the final power supply module 3. The positive electrode of the fourth diode D4 is grounded. The other end of the fourth capacitor C4 is grounded. The other end of the second resistor R2 is connected to one end of the second capacitor C2 and the negative electrode of the second diode D2. The other end of the second capacitor C2 is grounded. The positive electrode of the second diode D2 is connected to the power supply terminal of the third amplifier U3.

[0027] Initially, the first battery E1 supplies power alone, the second battery E2 and the third battery E3 supply power together, and the voltage at the common point A2 is the sum of the voltages of the second battery E2 and the third battery E3. If the voltage at the common point A2 is too low, it is difficult to determine whether it is the second battery E2 or the third battery E3 that is undervoltage; therefore, first detect the voltage of the first battery E1 (supplying power alone, not affected by interference), then detect the voltage of the second battery E2, and further detect the voltage of the third battery E3 (first determine whether the voltage of the second battery E2 is lower than the threshold, and then determine whether the voltage of the third battery E3 is higher than the threshold through the voltage at the common point S2). Finally, after all the batteries are detected, drive the final power supply module 3 to supply power to the motor and the motor power supply control system.

[0028] After the 5V voltage is supplied, it directly powers the first amplifier U1. The first amplifier U1 determines whether the voltage at the common point A1 reaches the threshold (greater than the reference voltage VREF1, which can be 90% of the 12V battery); the time for charging the second capacitor C2 through the second resistor R2 and delaying the conduction of the second diode D2 (zener diode) is used as the first time. After the first time, power is supplied to the third amplifier U3. The third amplifier U3 determines whether the voltage at the common point A3 reaches the threshold (greater than the reference voltage VREF3, also 90% of the 12V battery); the time for charging the first capacitor C1 through the first resistor R1 and delaying the conduction of the first diode D1 (zener diode) is used as the second time. After the second time, power is supplied to the second amplifier U2. The second amplifier U2 determines whether the voltage at the common point A2 reaches the set value (greater than the reference voltage VREF2, which is 90% of the 24V battery). When it reaches, it is determined that the voltage of the second battery E2 reaches the threshold; the time for charging the third capacitor C3 through the first resistor R1, the first capacitor C1, the first diode D1, and the third resistor R3 and delaying the conduction of the third diode D3 (zener diode) is used as the third time. After the third diode D3 conducts, the voltage is clamped by the fourth diode D4 (zener diode) and filtered by the fourth capacitor C4, and then a stable voltage is output to drive the final power supply module 3 to work. The first time < the second time < the third time, so that the first amplifier U1 works first, the second amplifier U2 works second, the third amplifier U3 works next, and finally the final power supply module 3 is driven to work, ensuring that the battery voltages are all determined before power supply.

[0029] In another embodiment: Here, 90% of the rated battery voltage is used as the threshold, and it can also be 95%, 85%, etc. of the battery voltage as the threshold, not limited to 90% of the battery voltage.

[0030] In this embodiment: Please refer to Figure 4, the size determination unit includes a first amplifier U1, a second amplifier U2, and a third amplifier U3. The non-inverting input terminal of the first amplifier U1 is connected to the common point A1, the inverting input terminal of the first amplifier U1 is connected to the voltage VREF1, and the output terminal of the first amplifier U1 is connected to the common point B11. The non-inverting input terminal of the second amplifier U2 is connected to the common point A2, the inverting input terminal of the second amplifier U2 is connected to the voltage VREF2, and the output terminal of the second amplifier U2 is connected to the common point B21. The non-inverting input terminal of the third amplifier U3 is connected to the common point A3, the inverting input terminal of the third amplifier U3 is connected to the voltage VREF3, and the output terminal of the third amplifier U3 is connected to the common point B31.

[0031] When the common point A1 is greater than the voltage VREF1, the common point B11 is at a high level; otherwise, the common point B11 is at a low level. When the common point A2 is greater than the voltage VREF2, the common point B21 is at a high level; otherwise, the common point B21 is at a low level. When the common point A3 is greater than the voltage VREF3, the common point B31 is at a high level; otherwise, the common point B31 is at a low level.

[0032] In another embodiment: the voltages VREF1 and VREF3 are of the same magnitude and can use the same label.

[0033] In this embodiment: please refer to Figure 4 , the inverting output unit includes a fourth inverter U4, a fifth inverter U5, a sixth inverter U6, a seventh inverter U7, and a thirty-third MOS transistor V33. The input terminal of the fourth inverter U4 is connected to the common point B11, the output terminal of the fourth inverter U4 is connected to the common point B12. The input terminal of the fifth inverter U5 is connected to the common point B21 and the S pole of the thirty-third MOS transistor V33. The output terminal of the fifth inverter U5 is connected to the common point B22 and the input terminal of the seventh inverter U7. The output terminal of the seventh inverter U7 is connected to the G pole of the thirty-third MOS transistor V33. The D pole of the thirty-third MOS transistor V33 is connected to the positive electrode of the first diode D1. The input terminal of the sixth inverter U6 is connected to the common point B31, and the output terminal of the sixth inverter U6 is connected to the common point B32.

[0034] The inverter flips the voltage. Taking the common point B11 as an example, when the common point B11 is at a high level, the common point B12 is at a low level; when the common point B11 is at a low level, the common point B12 is at a high level.

[0035] After detecting the voltage of the common point A2, if it is determined to be higher than the threshold, the input terminal of this fifth inverter U5 is at a high level, the output terminal is at a low level, the seventh inverter U7 outputs a high level to drive the thirty-third MOS transistor V33 to conduct, and maintains the input terminal of the fifth inverter U5 at a high level to avoid misjudgment caused by the voltage drop after the negative electrode of the second battery E2 is grounded.

[0036] In another embodiment, the inverter may not be provided, and all the NMOS transistors corresponding to the common points B12, B22, and B32 may be replaced with PMOS transistors.

[0037] In this embodiment: Please refer to Figure 4 , and finally the power supply module 3 includes a thirty-first MOS transistor V31 and a thirty-second MOS transistor V32. The D pole of the thirty-first MOS transistor V31 is connected to the voltage VDD, the G pole of the thirty-first MOS transistor V31 is connected to the second output terminal of the voltage detection and control module 2, the S pole of the thirty-first MOS transistor V31 is connected to the motor, the D pole of the thirty-second MOS transistor V32 is connected to the voltage VCC, the G pole of the thirty-second MOS transistor V32 is connected to the second output terminal of the voltage detection and control module 2, and the S pole of the thirty-second MOS transistor V32 is connected to the motor power supply control system.

[0038] After a third time, the G poles of the thirty-first MOS transistor V31 and the thirty-second MOS transistor V32 become high level, the voltage VDD supplies power to the motor through the thirty-first MOS transistor V31, and the voltage VCC supplies power to the motor power supply control system through the thirty-second MOS transistor V32.

[0039] In another embodiment: The relays can also be used to control the working circuits of the voltage VDD and VCC respectively with the motor and the motor power supply control system.

[0040] The working principle of the present invention is as follows: The battery combination module 1 is used to set three batteries. Two batteries are connected in series and supply power to the motor through the final power supply module 3, and another battery separately supplies power to the motor power supply control system through the final power supply module 3; the voltage detection and control module 2 is used to detect the voltages of the three batteries. When the voltage of a single battery is lower than the threshold, it will control the other two batteries to form a traditional generator power supply structure and supply power to the motor and the motor power supply control system through the final power supply module 3; the final power supply module 3 is used to supply power to the motor and the motor power supply control system after power-on delay.

[0041] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0042] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power supply switching circuit for a generator set, characterized in that, The power supply switching circuit of the generator set includes: A battery combination module for setting three batteries. Two batteries are connected in series and supply power to the motor through the final power supply module, and the other battery supplies power to the motor power supply control system alone through the final power supply module; A voltage detection and control module for detecting the voltages of the three batteries. When the voltage of a single battery is lower than the threshold, it will control the other two batteries to form a traditional generator power supply structure and supply power to the motor and the motor power supply control system through the final power supply module; A final power supply module for supplying power to the motor and the motor power supply control system after a power-on delay; The first output terminal of the battery combination module is connected to the input terminal of the voltage detection and control module, the second output terminal of the battery combination module is connected to the first input terminal of the final power supply module, the first output terminal of the voltage detection and control module is connected to the input terminal of the battery combination module, and the second output terminal of the voltage detection and control module is connected to the second input terminal of the final power supply module.

2. The power supply switching circuit of the generator set according to claim 1, wherein The battery combination module includes a first battery, a second battery, and a third battery. The positive electrode of the first battery is connected to the common point A1, the D pole of the third MOS transistor, the D pole of the sixth MOS transistor, and the D pole of the ninth MOS transistor. The G pole of the third MOS transistor is connected to the common point B11, the S pole of the third MOS transistor is connected to the D pole of the second MOS transistor, the G pole of the second MOS transistor is connected to the common point B21, the S pole of the second MOS transistor is connected to the D pole of the first MOS transistor, the G pole of the first MOS transistor is connected to the common point B32, the S pole of the first MOS transistor is connected to the voltage VDD. The G pole of the sixth MOS transistor is connected to the common point B11, the S pole of the sixth MOS transistor is connected to the D pole of the fifth MOS transistor, the G pole of the fifth MOS transistor is connected to the common point B22, the S pole of the fifth MOS transistor is connected to the D pole of the fourth MOS transistor, the G pole of the fourth MOS transistor is connected to the common point B31, the S pole of the fourth MOS transistor is connected to the voltage VDD. The G pole of the ninth MOS transistor is connected to the common point B11, the S pole of the ninth MOS transistor is connected to the D pole of the eighth MOS transistor, the G pole of the eighth MOS transistor is connected to the common point B21, the S pole of the eighth MOS transistor is connected to the D pole of the seventh MOS transistor, the G pole of the seventh MOS transistor is connected to the common point B31, and the S pole of the seventh MOS transistor is connected to the voltage VCC; The negative electrode of the first battery is connected to the D electrodes of the tenth MOS transistor and the eleventh MOS transistor. The G electrode of the tenth MOS transistor is connected to the common point B31, and the G electrode of the eleventh MOS transistor is connected to the common point B32. The S electrode of the tenth MOS transistor is connected to the D electrodes of the seventeenth MOS transistor and the twentieth MOS transistor. The G electrode of the seventeenth MOS transistor is connected to the common point B11, the S electrode of the seventeenth MOS transistor is connected to the D electrode of the eighteenth MOS transistor, the G electrode of the eighteenth MOS transistor is connected to the common point B21, the S electrode of the eighteenth MOS transistor is connected to the D electrode of the nineteenth MOS transistor, the G electrode of the nineteenth MOS transistor is connected to the common point B31, and the S electrode of the nineteenth MOS transistor is grounded. The G electrode of the twentieth MOS transistor is connected to the common point B11, the S electrode of the twentieth MOS transistor is connected to the D electrode of the twenty-first MOS transistor, the G electrode of the twenty-first MOS transistor is connected to the common point B22, the S electrode of the twenty-first MOS transistor is connected to the D electrode of the twenty-second MOS transistor, the G electrode of the twenty-second MOS transistor is connected to the common point B31, and the S electrode of the twenty-second MOS transistor is connected to the common point A3; The S electrode of the eleventh MOS transistor is connected to the D electrodes of the twelfth MOS transistor, the fourteenth MOS transistor, the positive electrode of the second battery, and the common point A2. The G electrode of the twelfth MOS transistor is connected to the common point B31, the S electrode of the twelfth MOS transistor is connected to the D electrode of the thirteenth MOS transistor, the G electrode of the thirteenth MOS transistor is connected to the common point B21, the S electrode of the thirteenth MOS transistor is connected to the voltage VDD. The G electrode of the fourteenth MOS transistor is connected to the common point B32, the S electrode of the fourteenth MOS transistor is connected to the D electrode of the fifteenth MOS transistor, the G electrode of the fifteenth MOS transistor is connected to the common point B21, the S electrode of the fifteenth MOS transistor is connected to the D electrode of the sixteenth MOS transistor, the G electrode of the sixteenth MOS transistor is connected to the common point B11, and the S electrode of the sixteenth MOS transistor is connected to the voltage VCC. The negative electrode of the second battery is connected to the D electrodes of the twenty-ninth MOS transistor and the thirtieth MOS transistor. The G electrode of the twenty-ninth MOS transistor is connected to the common point B31, the G electrode of the thirtieth MOS transistor is connected to the common point B32, the S electrode of the thirtieth MOS transistor is grounded, and the S electrode of the twenty-ninth MOS transistor is connected to the common point A3; The positive electrode of the third battery is connected to the common point A3, the drain of the twenty-fifth MOS transistor, and the drain of the twenty-eighth MOS transistor. The negative electrode of the third battery is grounded. The gate of the twenty-fifth MOS transistor is connected to the common point B31. The source of the twenty-fifth MOS transistor is connected to the drain of the twenty-fourth MOS transistor. The gate of the twenty-fourth MOS transistor is connected to the common point B22. The source of the twenty-fourth MOS transistor is connected to the drain of the twenty-third MOS transistor. The gate of the twenty-third MOS transistor is connected to the common point B11. The source of the twenty-third MOS transistor is connected to the voltage VCC. The gate of the twenty-eighth MOS transistor is connected to the common point B31. The source of the twenty-eighth MOS transistor is connected to the drain of the twenty-seventh MOS transistor. The gate of the twenty-seventh MOS transistor is connected to the common point B21. The source of the twenty-seventh MOS transistor is connected to the drain of the twenty-sixth MOS transistor. The gate of the twenty-sixth MOS transistor is connected to the common point B12. The source of the twenty-sixth MOS transistor is connected to the voltage VCC.

3. The power supply switching circuit of the generator set according to claim 1 or 2, characterized in that The voltage detection and control module includes: A power supply control unit for supplying power to the first amplifier after power-on, supplying power to the third amplifier after a first period of time, supplying power to the second amplifier after a second period of time, and providing a trigger signal to the final power supply module after a third period of time; A magnitude judgment unit for respectively detecting whether the voltages of the first battery, the second battery, and the third battery are lower than a threshold value through the first amplifier, the second amplifier, and the third amplifier; when the battery voltage is lower than the threshold value, the corresponding amplifier outputs a low level, and when the battery voltage is higher than the threshold value, the corresponding amplifier outputs a high level; An inverting output unit for setting the fourth inverter, the fifth inverter, and the sixth inverter to correspond to the first amplifier, the second amplifier, and the third amplifier respectively, and the inverter inverts and outputs the output voltage signal of the corresponding amplifier; The first output terminal of the power supply control unit is connected to the second input terminal of the magnitude judgment unit. The second output terminal of the power supply control unit is connected to the second input terminal of the final power supply module. The first input terminal of the magnitude judgment unit is connected to the first output terminal of the battery combination module. The output terminal of the magnitude judgment unit is connected to the input terminal of the inverting output unit. The output terminal of the inverting output unit is connected to the input terminal of the battery combination module.

4. The power supply switching circuit of the generator set according to claim 3, characterized in that, The power supply control unit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a third diode, and a fourth diode. One end of the first resistor is connected to a 5V voltage, one end of the second resistor, and the power supply terminal of the first amplifier. The other end of the first resistor is connected to one end of the first capacitor and the negative electrode of the first diode. The other end of the first capacitor is grounded. The positive electrode of the first diode is connected to one end of the third resistor and the power supply terminal of the second amplifier. The other end of the third resistor is connected to one end of the third capacitor and the negative electrode of the third diode. The other end of the third capacitor is grounded. The positive electrode of the third diode is connected to the negative electrode of the fourth diode, one end of the fourth capacitor, and the second input terminal of the final power supply module. The positive electrode of the fourth diode is grounded. The other end of the fourth capacitor is grounded. The other end of the second resistor is connected to one end of the second capacitor and the negative electrode of the second diode. The other end of the second capacitor is grounded. The positive electrode of the second diode is connected to the power supply terminal of the third amplifier.

5. The power supply switching circuit of the generator set according to claim 3, characterized in that, The size judgment unit includes a first amplifier, a second amplifier, and a third amplifier. The non-inverting input terminal of the first amplifier is connected to the common point A1. The inverting input terminal of the first amplifier is connected to the voltage VREF1. The output terminal of the first amplifier is connected to the common point B11. The non-inverting input terminal of the second amplifier is connected to the common point A2. The inverting input terminal of the second amplifier is connected to the voltage VREF2. The output terminal of the second amplifier is connected to the common point B21. The non-inverting input terminal of the third amplifier is connected to the common point A3. The inverting input terminal of the third amplifier is connected to the voltage VREF3. The output terminal of the third amplifier is connected to the common point B31.

6. The power supply switching circuit of the generator set according to claim 3, wherein The inverting output unit includes a fourth inverter, a fifth inverter, and a sixth inverter. The input terminal of the fourth inverter is connected to the common point B11. The output terminal of the fourth inverter is connected to the common point B12. The input terminal of the fifth inverter is connected to the common point B21. The output terminal of the fifth inverter is connected to the common point B22. The input terminal of the sixth inverter is connected to the common point B31. The output terminal of the sixth inverter is connected to the common point B32.

7. The power supply switching circuit of the generator set according to claim 1, characterized in that, The final power supply module includes a thirty-first MOS transistor and a thirty-second MOS transistor. The D pole of the thirty-first MOS transistor is connected to the voltage VDD. The G pole of the thirty-first MOS transistor is connected to the second output terminal of the voltage detection and control module. The S pole of the thirty-first MOS transistor is connected to the motor. The D pole of the thirty-second MOS transistor is connected to the voltage VCC. The G pole of the thirty-second MOS transistor is connected to the second output terminal of the voltage detection and control module. The S pole of the thirty-second MOS transistor is connected to the motor power supply control system.

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