A power supply switching circuit for a generator set

Abstract

The present invention discloses a power supply switching circuit for a generator set, which relates to the field of power supply. The power supply switching circuit for the generator set comprises: a battery combination module, which is used to set three batteries, two of which are connected in series and pass through a final power supply module to power a motor, and another battery is separately passed through the final power supply module to power a motor power supply control system; a voltage detection control module, which is used to detect the voltages of the three batteries, and when the voltage of a single battery is lower than a threshold, it will control the other two batteries to be combined into a traditional generator power supply structure. The beneficial effects of the present invention are: the battery combination module of the present invention is provided with three batteries, one battery is used to power a motor power supply control system, and the other two batteries are connected in series to power the motor, thereby avoiding excessive energy consumption of a single battery and affecting power supply; when the voltage detection control module detects that the battery combination module has insufficient battery power supply, it will control the battery connection of the battery combination module and change to a traditional generator power supply structure to maintain power generation.

Description

Technical Field

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

[0002] Traditional generator power supply structure such as Figure 1 As shown in the figure, 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, feeds back signals, and makes the power generation stable) is 12V. Therefore, two 12V batteries are often used as the power supply. The 24V voltage obtained by connecting the two batteries in series is used to power the motor, and a single 12V battery is used to power the motor power supply control system.

[0003] Since battery E4 supplies power to both the motor and the motor power supply control system, it consumes power faster than battery E5. Battery E4 will have insufficient power supply first, and insufficient power supply from battery E4 will cause low voltage in the motor and the motor power supply control system, affecting power generation and requiring improvement. Summary of the Invention

[0004] The object 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 technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A power supply switching circuit for a generator set, comprising:

[0007] A battery combination module is used to set three batteries, two of which are connected in series and pass through the final power supply module to power the motor, and the other battery is connected alone and passes through the final power supply module to power the motor power supply control system;

[0008] The voltage detection control module is used to detect the voltage of the three batteries. When the voltage of a single battery is lower than the threshold, it controls the other two batteries to form a traditional generator power supply structure, and then supplies power to the motor and motor power supply control system through the final power supply module;

[0009] The final power supply module is used to power the motor and motor power control system after the power-on delay;

[0010] The first output end of the battery combination module is connected to the input end of the voltage detection 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 control module is connected to the input end of the battery combination module, and the second output end of the voltage detection control module is connected to the second input end of the final power supply module.

[0011] 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 electrode of the third MOS tube, the D electrode of the sixth MOS tube, and the D electrode of the ninth MOS tube, the G electrode of the third MOS tube is connected to the common point B11, the S electrode of the third MOS tube is connected to the D electrode of the second MOS tube, the G electrode of the second MOS tube is connected to the common point B21, the S electrode of the second MOS tube is connected to the D electrode of the first MOS tube, the G electrode of the first MOS tube is connected to the common point B32, the S electrode of the first MOS tube is connected to the voltage VDD, and the G electrode of the sixth MOS tube is connected to the common point B1 1. The S-pole of the sixth MOS tube is connected to the D-pole of the fifth MOS tube, the G-pole of the fifth MOS tube is connected to the common point B22, the S-pole of the fifth MOS tube is connected to the D-pole of the fourth MOS tube, the G-pole of the fourth MOS tube is connected to the common point B31, the S-pole of the fourth MOS tube is connected to the voltage VDD, the G-pole of the ninth MOS tube is connected to the common point B11, the S-pole of the ninth MOS tube is connected to the D-pole of the eighth MOS tube, the G-pole of the eighth MOS tube is connected to the common point B21, the S-pole of the eighth MOS tube is connected to the D-pole of the seventh MOS tube, the G-pole of the seventh MOS tube is connected to the common point B31, and the S-pole of the seventh MOS tube is connected to the voltage VCC;

[0012] The negative electrode of the first battery is connected to the D pole of the tenth MOS tube and the D pole of the eleventh MOS tube, the G pole of the tenth MOS tube is connected to the common point B31, the G pole of the eleventh MOS tube is connected to the common point B32, the S pole of the tenth MOS tube is connected to the D pole of the seventeenth MOS tube and the D pole of the twentieth MOS tube, the G pole of the seventeenth MOS tube is connected to the common point B11, the S pole of the seventeenth MOS tube is connected to the D pole of the eighteenth MOS tube, the G pole of the eighteenth MOS tube is connected to the common point B21, the S pole of the eighteenth MOS tube is connected to the D pole of the nineteenth MOS tube, the G pole of the nineteenth MOS tube is connected to the common point B31, the S pole of the nineteenth MOS tube is grounded, the G pole of the twentieth MOS tube is connected to the common point B11, the S pole of the twentieth MOS tube is connected to the D pole of the twenty-first MOS tube, the G pole of the twenty-first MOS tube is connected to the common point B22, the S pole of the twenty-first MOS tube is connected to the D pole of the twenty-second MOS tube, the G pole of the twenty-second MOS tube is connected to the common point B31, and the S pole of the twenty-second MOS tube is connected to the common point A3;

[0013] The S-pole of the eleventh MOS tube is connected to the D-pole of the twelfth MOS tube, the D-pole of the fourteenth MOS tube, the positive electrode of the second battery, and the common point A2; the G-pole of the twelfth MOS tube is connected to the common point B31; the S-pole of the twelfth MOS tube is connected to the D-pole of the thirteenth MOS tube; the G-pole of the thirteenth MOS tube is connected to the common point B21; the S-pole of the thirteenth MOS tube is connected to the voltage VDD; the G-pole of the fourteenth MOS tube is connected to the common point B32; the S-pole of the fourteenth MOS tube is connected to the D-pole of the fifteenth MOS tube; and the G-pole of the fifteenth MOS tube is connected to the common point B33. The G electrode of the fifteenth MOS tube is connected to the common point B21, the S electrode of the fifteenth MOS tube is connected to the D electrode of the sixteenth MOS tube, the G electrode of the sixteenth MOS tube is connected to the common point B11, the S electrode of the sixteenth MOS tube is connected to the voltage VCC, the negative electrode of the second battery is connected to the D electrode of the twenty-ninth MOS tube, the D electrode of the thirtieth MOS tube, the G electrode of the twenty-ninth MOS tube is connected to the common point B31, the G electrode of the thirtieth MOS tube is connected to the common point B32, the S electrode of the thirtieth MOS tube is grounded, and the S electrode of the twenty-ninth MOS tube is connected to the common point A3;

[0014] The positive electrode of the third battery is connected to the common point A3, the D electrode of the twenty-fifth MOS tube, and the D electrode of the twenty-eighth MOS tube. The negative electrode of the third battery is grounded. The G electrode of the twenty-fifth MOS tube is connected to the common point B31. The S electrode of the twenty-fifth MOS tube is connected to the D electrode of the twenty-fourth MOS tube. The G electrode of the twenty-fourth MOS tube is connected to the common point B22. The S electrode of the twenty-fourth MOS tube is connected to the D electrode of the twenty-third MOS tube. The G electrode of the twenty-third MOS tube is connected to the common point B11. The S electrode of the twenty-third MOS tube is connected to the voltage VCC. The G electrode of the twenty-eighth MOS tube is connected to the common point B31. The S electrode of the twenty-eighth MOS tube is connected to the D electrode of the twenty-seventh MOS tube. The G electrode of the twenty-seventh MOS tube is connected to the common point B21. The S electrode of the twenty-seventh MOS tube is connected to the D electrode of the twenty-sixth MOS tube. The G electrode of the twenty-sixth MOS tube is connected to the common point B12. The S electrode of the twenty-sixth MOS tube is connected to the voltage VCC.

[0015] As a further solution of the present invention: the voltage detection control module includes:

[0016] A power supply control unit, configured to supply power to the first amplifier after power-on, supply power to the third amplifier after a first time, supply power to the second amplifier after a second time, and provide a trigger signal to the final power supply module after a third time;

[0017] A size judgment unit is used to detect whether the voltage of the first battery, the second battery, and the third battery is lower than a threshold value through the first amplifier, the second amplifier, and the third amplifier respectively; when the battery voltage is lower than the threshold value, the corresponding amplifier outputs a low level; when the battery voltage is higher than the threshold value, the corresponding amplifier outputs a high level;

[0018] an inverting output unit, configured to set a fourth inverter, a fifth inverter, and a sixth inverter to correspond to the first amplifier, the second amplifier, and the third amplifier, respectively, and the inverter inverts the output voltage signal of the corresponding amplifier and outputs the inverted signal;

[0019] The first output end of the power supply control unit is connected to the second input end of the size judgment unit, the second output end of the power supply control unit is connected to the second input end of the final power supply module, the first input end of the size judgment unit is connected to the first output end of the battery combination module, the output end of the size judgment unit is connected to the input end of the inverting output unit, and the output end of the inverting output unit is connected to the input end of the battery combination module.

[0020] 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 end 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 end 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 end 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 end of the third amplifier.

[0021] As a further solution of the present invention: the size judgment unit includes a first amplifier, a second amplifier, and a third amplifier. The non-inverting end of the first amplifier is connected to the common point A1, the inverting end of the first amplifier is connected to the voltage VREF1, the output end of the first amplifier is connected to the common point B11, the non-inverting end of the second amplifier is connected to the common point A2, the inverting end of the second amplifier is connected to the voltage VREF2, the output end of the second amplifier is connected to the common point B21, the non-inverting end of the third amplifier is connected to the common point A3, the inverting end of the third amplifier is connected to the voltage VREF3, and the output end of the third amplifier is connected to the common point B31.

[0022] 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 end of the fourth inverter is connected to the common point B11, the output end of the fourth inverter is connected to the common point B12, the input end of the fifth inverter is connected to the common point B21, the output end of the fifth inverter is connected to the common point B22, the input end of the sixth inverter is connected to the common point B31, and the output end of the sixth inverter is connected to the common point B32.

[0023] As a further solution of the present invention: 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 end of the voltage detection 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 end of the voltage detection control module, and the S pole of the thirty-second MOS transistor is connected to the motor power supply control system.

[0024] 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, thereby avoiding excessive energy consumption of a single battery and affecting the power supply; when the voltage detection control module detects that the battery combination module has insufficient battery power supply, it will control the battery connection of the battery combination module and change it to a traditional generator power supply structure to maintain power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of powering a conventional generator set.

[0026] Figure 2 This is a schematic diagram of a power supply switching circuit for a generator set.

[0027] Figure 3 This is the circuit diagram of the battery combination module.

[0028] Figure 4 This is the circuit diagram of the voltage detection control module and the final power supply module. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] See also Figure 2 , a generator set power supply switching circuit, comprising:

[0031] The battery combination module 1 is used to set three batteries, two of which are connected in series and pass through the final power supply module 3 to power the motor, and the other battery passes through the final power supply module 3 alone to power the motor power supply control system;

[0032] Voltage detection control module 2 is used to detect the voltage of the three batteries. When the voltage of a single battery is lower than the threshold, it controls the other two batteries to form a traditional generator power supply structure, and then supplies power to the motor and motor power supply control system through the final power supply module 3;

[0033] The final power supply module 3 is used to supply power to the motor and the motor power supply control system after the power-on delay;

[0034] The first output end of the battery combination module 1 is connected to the input end of the voltage detection control module 2, the second output end of the battery combination module 1 is connected to the first input end of the final power supply module 3, the first output end of the voltage detection control module 2 is connected to the input end of the battery combination module 1, and the second output end of the voltage detection control module 2 is connected to the second input end of the final power supply module 3.

[0035] In this example: See Figure 3 The battery assembly 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 a common point A1, the D electrode of the third MOS transistor V3, the D electrode of the sixth MOS transistor V6, and the D electrode of the ninth MOS transistor V9. The G electrode of the third MOS transistor V3 is connected to a common point B11. The S electrode of the third MOS transistor V3 is connected to the D electrode of the second MOS transistor V2. The G electrode of the second MOS transistor V2 is connected to a common point B21. The S electrode of the second MOS transistor V2 is connected to the D electrode of the first MOS transistor V1. The G electrode of the first MOS transistor V1 is connected to a common point B32. The S electrode of the first MOS transistor V1 is connected to a voltage VDD. The G electrode of the sixth MOS transistor V6 is connected to a common point B11. The S pole of the 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;

[0036] The negative electrode of the first battery E1 is connected to the D electrode of the tenth MOS transistor V10 and the D electrode of the eleventh MOS transistor V11. The G electrode of the tenth MOS transistor V10 is connected to the common point B31. 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 electrode of the seventeenth MOS transistor V17 and the D electrode of 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 pole is connected to the D pole of the nineteenth MOS tube V19, the G pole of the nineteenth MOS tube V19 is connected to the common point B31, the S pole of the nineteenth MOS tube V19 is grounded, the G pole of the twentieth MOS tube V20 is connected to the common point B11, the S pole of the twentieth MOS tube V20 is connected to the D pole of the twenty-first MOS tube V21, the G pole of the twenty-first MOS tube V21 is connected to the common point B22, the S pole of the twenty-first MOS tube V21 is connected to the D pole of the twenty-second MOS tube V22, the G pole of the twenty-second MOS tube V22 is connected to the common point B31, and the S pole of the twenty-second MOS tube V22 is connected to the common point A3;

[0037] The S pole of the eleventh MOS transistor V11 is connected to the D pole of the twelfth MOS transistor V12, the D pole of the fourteenth MOS transistor V14, the positive pole of the second battery E2, and the common point A2. The G pole of the twelfth MOS transistor V12 is connected to the common point B31. The S pole of the twelfth MOS transistor V12 is connected to the D pole of the thirteenth MOS transistor V13. The G pole of the thirteenth MOS transistor V13 is connected to the common point B21. The S pole of the thirteenth MOS transistor V13 is connected to the voltage VDD. The G pole of the fourteenth MOS transistor V14 is connected to the common point B32. The S pole of the fourteenth MOS transistor V14 is connected to the D pole of the fifteenth MOS transistor V15. The G electrode of the 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 electrode of the twenty-ninth MOS transistor V29, the D electrode of 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;

[0038] The positive electrode of the third battery E3 is connected to the common point A3, the D electrode of the twenty-fifth MOS tube V25, and the D electrode of the twenty-eighth MOS tube V28. The negative electrode of the third battery E3 is grounded. The G electrode of the twenty-fifth MOS tube V25 is connected to the common point B31. The S electrode of the twenty-fifth MOS tube V25 is connected to the D electrode of the twenty-fourth MOS tube V24. The G electrode of the twenty-fourth MOS tube V24 is connected to the common point B22. The S electrode of the twenty-fourth MOS tube V24 is connected to the D electrode of the twenty-third MOS tube V23. The G electrode of the twenty-third MOS tube V23 is connected to the common point B31. 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, and the S-pole of the twenty-sixth MOS transistor V26 is connected to the voltage VCC.

[0039] When the voltages on the first battery E1, the second battery E2, and the third battery E3 are all above the threshold, the common points B11, B21, and B31 are all high, and B12, B22, and B32 are all low. The cathode of the first battery E1 is grounded via the tenth MOS transistor V10, the seventeenth MOS transistor V17, the eighteenth MOS transistor V18, and the nineteenth MOS transistor V19. The anode of the first battery E1 outputs a voltage VCC via the ninth MOS transistor V9, the eighth MOS transistor V8, and the seventh MOS transistor V7. The voltage on the first battery E1 serves as voltage VCC. The second battery E2 is connected in series with the third battery E3 via the twenty-ninth MOS transistor V29. The anode of the second battery E2 outputs a voltage VDD via the twelfth MOS transistor V12 and the thirteenth MOS transistor V13. The sum of the voltages on the second and third batteries E2 and E3 serves as voltage VDD. Here, the first battery E1 supplies power to the motor power control system, while the second and third batteries E2 and E3 are connected in series to power the motor. This prevents excessive energy consumption by a single battery and affects power supply.

[0040] When the voltage of the first battery E1 is lower than the threshold, and the voltages of the second battery E2 and the third battery E3 are higher than the threshold, the common points B12, B21, and B31 are all high, and B11, B22, and B32 are all low. The common point B11 is low, 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 all low. E3 are connected in series, and the positive electrode of the second battery E2 outputs the voltage VDD through the twelfth MOS transistor V12 and the thirteenth MOS transistor V13. At this time, the power supply mode of the second battery E2 and the third battery E3 is a traditional generator power supply structure. The second battery E2 serves as the power supply for the motor and also as the power supply for the motor power supply control system, and the third battery E3 serves only as the power supply for the motor. The second battery E2 consumes power faster than the third battery E3. At the same time, the second battery E2 supplies power to two loads with different voltages, which may cause power supply interference. Therefore, the traditional generator power supply structure is used as an emergency power supply mode.

[0041] When the voltage of the second battery E2 is lower than the threshold, and the voltages of the first battery E1 and the third battery E3 are higher than the threshold, the common points B11, B22, and B31 are all high, and B12, B21, and B32 are all low. The first battery E1 is connected in series with the third battery E3 via 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 a voltage VDD via the sixth MOS transistor V6, the fifth MOS transistor V5, and the fourth MOS transistor V4. The third battery E3 outputs a voltage VCC via the twenty-fifth MOS transistor V25, the twenty-fourth MOS transistor V24, and the twenty-third MOS transistor V23, also adopting a traditional generator power supply structure.

[0042] When the voltage of the third battery E3 is lower than the threshold and the voltages of the first battery E1 and the second battery E2 are higher than the threshold, the common points B11, B21, and B32 are all at high levels, and B12, B22, and B31 are all at low levels. The cathode of the second battery E2 is grounded via the 30th MOS transistor V30, and the anode of the second battery E2 is connected to the cathode of the first battery E1 via the 11th MOS transistor V11. The anode of the first battery E1 is supplied with voltage VDD via the third MOS transistor V3, the second MOS transistor V2, and the first MOS transistor V1. The anode of the second battery E2 is supplied with voltage VCC via the 14th MOS transistor V14, the 15th MOS transistor V15, and the 16th MOS transistor V16, which is also a traditional generator power supply structure.

[0043] In another embodiment, other types of switch tubes may be selected to replace the MOS tube, such as a triode, an IGBT tube, etc.

[0044] In this example: See Figure 4 , the voltage detection control module 2 includes:

[0045] A power supply control unit is configured to supply power to the first amplifier U1 after power-on, supply power to the third amplifier U3 after a first time, supply power to the second amplifier U2 after a second time, and provide a trigger signal to the final power supply module 3 after a third time;

[0046] The size judgment unit is used to detect whether the voltage of the first battery E1, the second battery E2, and the third battery E3 is lower than the threshold value through the first amplifier U1, the second amplifier U2, and the third amplifier U3 respectively; when the battery voltage is lower than the threshold value, the corresponding amplifier outputs a low level; when the battery voltage is higher than the threshold value, the corresponding amplifier outputs a high level;

[0047] The inverting output unit is used 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 the output voltage signal of the corresponding amplifier and outputs it;

[0048] The first output end of the power supply control unit is connected to the second input end of the size judgment unit, the second output end of the power supply control unit is connected to the second input end of the final power supply module 3, the first input end of the size judgment unit is connected to the first output end of the battery combination module 1, the output end of the size judgment unit is connected to the input end of the inverting output unit, and the output end of the inverting output unit is connected to the input end of the battery combination module 1.

[0049] In this example: See Figure 4The 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 a power supply end 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, the second The power supply end of the 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 end 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, and the positive electrode of the second diode D2 is connected to the power supply end of the third amplifier U3.

[0050] Initially, the first battery E1 supplies power independently, while the second and third batteries E2 and E3 supply power together. The voltage at the common point A2 is the sum of the voltages of the second and third batteries E2 and E3. If the voltage at the common point A2 is low, it is difficult to determine whether the second or third battery E2 is undervoltage. Therefore, the voltage of the first battery E1 is first detected (powered independently and without interference), followed by the voltage of the second battery E2, and then the voltage of the third battery E3 is further detected (first determining whether the voltage of the second battery E2 is lower than a threshold, and then determining whether the voltage of the third battery E3 is higher than a threshold based on the voltage at the common point S2). Finally, after all batteries have been tested, the final power supply module 3 is driven to supply power to the motor and the motor power supply control system.

[0051] After the 5V voltage is supplied, the first amplifier U1 is directly powered. The first amplifier U1 determines whether the voltage at the common point A1 reaches a threshold value (greater than the reference voltage VREF1, which can be 90% of the 12V battery); the second capacitor C2 is charged through the second resistor R2, and the time for delaying the conduction of the second diode D2 (voltage-stabilizing diode) is used as the first time. After the first time, the third amplifier U3 is powered. The third amplifier U3 determines whether the voltage at the common point A3 reaches a threshold value (greater than the reference voltage VREF3, which is also 90% of the 12V battery); the first capacitor C1 is charged through the first resistor R1, and the time for delaying the conduction of the first diode D1 (voltage-stabilizing 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 a set value (greater than the reference voltage VREF2, i.e., 90% of the 24V battery voltage). If so, it determines that the voltage of the second battery E2 has reached the threshold. The time it takes for the third diode D3 (a voltage-stabilizing diode) to be turned on after the first resistor R1, the first capacitor C1, the first diode D1, and the third resistor R3 charge the third capacitor C3 is delayed, and as the third time, after the third diode D3 is turned on, the voltage is clamped by the fourth diode D4 (a voltage-stabilizing diode) and filtered by the fourth capacitor C4. A stable voltage is then output to drive the final power supply module 3 to operate. The first time < the second time < the third time, resulting in the first amplifier U1 operating first, the second amplifier U2 operating second, and the third amplifier U3 operating third, ultimately driving the final power supply module 3 to operate. This ensures that all battery voltages are determined before power is supplied.

[0052] In another embodiment, 90% of the rated battery voltage is used as the threshold value, and the threshold value may also be 95%, 85%, etc. of the battery voltage, and is not limited to 90% of the battery voltage.

[0053] In this example: See Figure 4 The size judgment unit includes a first amplifier U1, a second amplifier U2, and a third amplifier U3. The non-inverting terminal of the first amplifier U1 is connected to the common point A1, the inverting 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 terminal of the second amplifier U2 is connected to the common point A2, the inverting 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 terminal of the third amplifier U3 is connected to the common point A3, the inverting 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.

[0054] 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.

[0055] In another embodiment, the voltage VREF1 and the voltage VREF3 have the same magnitude and can use the same marker.

[0056] In this example: See 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 end of the fourth inverter U4 is connected to the common point B11, the output end of the fourth inverter U4 is connected to the common point B12, the input end 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 end of the fifth inverter U5 is connected to the common point B22 and the input end of the seventh inverter U7, the output end 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 anode of the first diode D1, the input end of the sixth inverter U6 is connected to the common point B31, and the output end of the sixth inverter U6 is connected to the common point B32.

[0057] The inverter reverses 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.

[0058] After detecting the voltage at the common point A2, if it is determined to be higher than the threshold, the input terminal of the fifth inverter U5 is at a high level and the output terminal is at a low level. The seventh inverter U7 outputs a high level, driving the thirty-third MOS transistor V33 to conduct, maintaining the input terminal of the fifth inverter U5 at a high level. This prevents erroneous judgment caused by a voltage drop after the negative electrode of the second battery E2 is grounded.

[0059] 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.

[0060] In this example: See Figure 4Finally, 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 end of the voltage detection 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 end of the voltage detection control module 2, and the S pole of the thirty-second MOS transistor V32 is connected to the motor power supply control system.

[0061] After the third time, the G poles of the 31st MOS transistor V31 and the 32nd MOS transistor V32 become high level, the voltage VDD powers the motor through the 31st MOS transistor V31, and the voltage VCC powers the motor power supply control system through the 32nd MOS transistor V32.

[0062] In another embodiment, the voltages VDD and VCC and the working circuits of the motor and the motor power supply control system can also be controlled by relays.

[0063] The working principle of the present invention is: the battery combination module 1 is used to set three batteries, two batteries are connected in series and pass through the final power supply module 3 to power the motor, and the other battery is separately passed through the final power supply module 3 to power the motor power supply control system; the voltage detection control module 2 is used to detect the voltage of the three batteries. When the voltage of a single battery is lower than the threshold, the other two batteries will be controlled to form a traditional generator power supply structure, and power 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 power the motor and the motor power supply control system after the power-on delay.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0065] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods 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 generator set power supply switching circuit includes: A battery combination module is used to set three batteries, two of which are connected in series and pass through the final power supply module to power the motor, and the other battery is connected alone and passes through the final power supply module to power the motor power supply control system; The voltage detection control module is used to detect the voltage of the three batteries. When the voltage of a single battery is lower than the threshold, it controls the other two batteries to form a traditional generator power supply structure, and then supplies power to the motor and motor power supply control system through the final power supply module; The final power supply module is used to power the motor and motor power control system after the power-on delay; The first output end of the battery combination module is connected to the input end of the voltage detection 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 control module is connected to the input end of the battery combination module, and the second output end of the voltage detection control module is connected to the second input end of the final power supply module; 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 a common point A1, the D electrode of the third MOS tube, the D electrode of the sixth MOS tube, and the D electrode of the ninth MOS tube. The G electrode of the third MOS tube is connected to a common point B11. The S electrode of the third MOS tube is connected to the D electrode of the second MOS tube. The G electrode of the second MOS tube is connected to a common point B21. The S electrode of the second MOS tube is connected to the D electrode of the first MOS tube. The G electrode of the first MOS tube is connected to a common point B32. The S electrode of the first MOS tube is connected to a voltage VDD. The G electrode of the sixth MOS tube is connected to a common point B11. The sixth MO The S-pole of the S-tube is connected to the D-pole of the fifth MOS-tube, the G-pole of the fifth MOS-tube is connected to the common point B22, the S-pole of the fifth MOS-tube is connected to the D-pole of the fourth MOS-tube, the G-pole of the fourth MOS-tube is connected to the common point B31, the S-pole of the fourth MOS-tube is connected to the voltage VDD, the G-pole of the ninth MOS-tube is connected to the common point B11, the S-pole of the ninth MOS-tube is connected to the D-pole of the eighth MOS-tube, the G-pole of the eighth MOS-tube is connected to the common point B21, the S-pole of the eighth MOS-tube is connected to the D-pole of the seventh MOS-tube, the G-pole of the seventh MOS-tube is connected to the common point B31, and the S-pole of the seventh MOS-tube is connected to the voltage VCC; The negative electrode of the first battery is connected to the D pole of the tenth MOS tube and the D pole of the eleventh MOS tube, the G pole of the tenth MOS tube is connected to the common point B31, the G pole of the eleventh MOS tube is connected to the common point B32, the S pole of the tenth MOS tube is connected to the D pole of the seventeenth MOS tube and the D pole of the twentieth MOS tube, the G pole of the seventeenth MOS tube is connected to the common point B11, the S pole of the seventeenth MOS tube is connected to the D pole of the eighteenth MOS tube, the G pole of the eighteenth MOS tube is connected to the common point B21, the S pole of the eighteenth MOS tube is connected to the D pole of the nineteenth MOS tube, the G pole of the nineteenth MOS tube is connected to the common point B31, the S pole of the nineteenth MOS tube is grounded, the G pole of the twentieth MOS tube is connected to the common point B11, the S pole of the twentieth MOS tube is connected to the D pole of the twenty-first MOS tube, the G pole of the twenty-first MOS tube is connected to the common point B22, the S pole of the twenty-first MOS tube is connected to the D pole of the twenty-second MOS tube, the G pole of the twenty-second MOS tube is connected to the common point B31, and the S pole of the twenty-second MOS tube is connected to the common point A3; The S-pole of the eleventh MOS tube is connected to the D-pole of the twelfth MOS tube, the D-pole of the fourteenth MOS tube, the positive electrode of the second battery, and the common point A2; the G-pole of the twelfth MOS tube is connected to the common point B31; the S-pole of the twelfth MOS tube is connected to the D-pole of the thirteenth MOS tube; the G-pole of the thirteenth MOS tube is connected to the common point B21; the S-pole of the thirteenth MOS tube is connected to the voltage VDD; the G-pole of the fourteenth MOS tube is connected to the common point B32; the S-pole of the fourteenth MOS tube is connected to the D-pole of the fifteenth MOS tube; and the G-pole of the fifteenth MOS tube is connected to the common point B33. The G electrode of the fifteenth MOS tube is connected to the common point B21, the S electrode of the fifteenth MOS tube is connected to the D electrode of the sixteenth MOS tube, the G electrode of the sixteenth MOS tube is connected to the common point B11, the S electrode of the sixteenth MOS tube is connected to the voltage VCC, the negative electrode of the second battery is connected to the D electrode of the twenty-ninth MOS tube, the D electrode of the thirtieth MOS tube, the G electrode of the twenty-ninth MOS tube is connected to the common point B31, the G electrode of the thirtieth MOS tube is connected to the common point B32, the S electrode of the thirtieth MOS tube is grounded, and the S electrode of the twenty-ninth MOS tube is connected to the common point A3; The positive electrode of the third battery is connected to the common point A3, the D electrode of the twenty-fifth MOS tube, and the D electrode of the twenty-eighth MOS tube. The negative electrode of the third battery is grounded. The G electrode of the twenty-fifth MOS tube is connected to the common point B31. The S electrode of the twenty-fifth MOS tube is connected to the D electrode of the twenty-fourth MOS tube. The G electrode of the twenty-fourth MOS tube is connected to the common point B22. The S electrode of the twenty-fourth MOS tube is connected to the D electrode of the twenty-third MOS tube. The G electrode of the twenty-third MOS tube is connected to the common point B11. The S electrode of the twenty-third MOS tube is connected to the voltage VCC. The G electrode of the twenty-eighth MOS tube is connected to the common point B31. The S electrode of the twenty-eighth MOS tube is connected to the D electrode of the twenty-seventh MOS tube. The G electrode of the twenty-seventh MOS tube is connected to the common point B21. The S electrode of the twenty-seventh MOS tube is connected to the D electrode of the twenty-sixth MOS tube. The G electrode of the twenty-sixth MOS tube is connected to the common point B12. The S electrode of the twenty-sixth MOS tube is connected to the voltage VCC.

2. The generator set power supply switching circuit according to claim 1, characterized in that: The voltage detection control module includes: A power supply control unit, configured to supply power to the first amplifier after power-on, supply power to the third amplifier after a first time, supply power to the second amplifier after a second time, and provide a trigger signal to the final power supply module after a third time; A size judgment unit is used to detect whether the voltage of the first battery, the second battery, and the third battery is lower than a threshold value through the first amplifier, the second amplifier, and the third amplifier respectively; when the battery voltage is lower than the threshold value, the corresponding amplifier outputs a low level; when the battery voltage is higher than the threshold value, the corresponding amplifier outputs a high level; an inverting output unit, configured to set a fourth inverter, a fifth inverter, and a sixth inverter to correspond to the first amplifier, the second amplifier, and the third amplifier, respectively, and the inverter inverts the output voltage signal of the corresponding amplifier and outputs the inverted signal; The first output end of the power supply control unit is connected to the second input end of the size judgment unit, the second output end of the power supply control unit is connected to the second input end of the final power supply module, the first input end of the size judgment unit is connected to the first output end of the battery combination module, the output end of the size judgment unit is connected to the input end of the inverting output unit, and the output end of the inverting output unit is connected to the input end of the battery combination module.

3. The generator set power supply switching circuit according to claim 2, 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 end 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 end 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 end 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 end of the third amplifier.

4. The generator set power supply switching circuit according to claim 2, characterized in that: The size judgment unit includes a first amplifier, a second amplifier, and a third amplifier. The non-inverting terminal of the first amplifier is connected to a common point A1, the inverting terminal of the first amplifier is connected to a voltage VREF1, and the output terminal of the first amplifier is connected to a common point B11. The non-inverting terminal of the second amplifier is connected to a common point A2, the inverting terminal of the second amplifier is connected to a voltage VREF2, and the output terminal of the second amplifier is connected to a common point B21. The non-inverting terminal of the third amplifier is connected to a common point A3, the inverting terminal of the third amplifier is connected to a voltage VREF3, and the output terminal of the third amplifier is connected to a common point B31.

5. The generator set power supply switching circuit according to claim 2, characterized in that: The inverting output unit includes a fourth inverter, a fifth inverter, and a sixth inverter. The input end of the fourth inverter is connected to the common point B11, the output end of the fourth inverter is connected to the common point B12, the input end of the fifth inverter is connected to the common point B21, the output end of the fifth inverter is connected to the common point B22, the input end of the sixth inverter is connected to the common point B31, and the output end of the sixth inverter is connected to the common point B32.

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

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