A combined high-power and multi-voltage vehicle-mounted power control system and control method

Abstract

The present invention discloses a combined high-power and multi-voltage vehicle-mounted power control system and control method, which adopts a first voltage balancing module, a second voltage balancing module, a first energy storage module, a second energy storage module, a third energy storage module, a fourth energy storage module and a collaborative control module. The input end of the collaborative control module is used to turn off the first voltage balancing module if it is detected that the voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit is less than a preset first voltage threshold; if it is detected that the difference between the voltage detection value of the output end of the third vehicle-mounted energy storage supply circuit and the voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit is less than the preset first voltage threshold, then turn off the second voltage balancing module. The present invention constructs a vehicle-mounted power supply system in a series and parallel manner of energy storage modules, which can greatly improve the vehicle-mounted power supply capacity and output power as well as the reliability and flexibility of the vehicle-mounted power supply; through the voltage balancing of the energy storage modules, the performance and reliability of the vehicle-mounted power supply system can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted high-power energy storage and electric energy supply, and in particular discloses a combined high-power and multi-voltage vehicle-mounted electric energy control system and a control method. Background Art

[0002] Electric vehicles such as electric cars and electric engineering vehicles rely on the energy stored in on-board energy storage batteries to work. When the energy stored in the energy storage battery is consumed to a certain level, the energy storage battery is charged through the charging system to replenish energy. The energy storage battery capacity, energy storage battery charging technology, and on-board power supply adaptation have become important factors affecting the application experience of electric vehicles. At present, there are problems such as unsatisfactory cruising range and working hours due to limited energy storage battery capacity, and the on-board power application efficiency and energy storage battery application performance need to be improved.

[0003] Deficiencies in existing technologies:

[0004] 1. The rated voltage and rated current of existing energy storage modules are relatively low, and the energy storage capacity of the energy storage modules is unsatisfactory;

[0005] 2. Existing electric vehicles take a long time to charge, which does not meet some actual needs;

[0006] 3. The existing on-board energy storage modules have a single combination mode, low redundancy and backup, and the power supply reliability needs to be improved;

[0007] 4. The existing vehicle-mounted power supply voltage is single, which limits the selection range of vehicle-mounted electrical equipment;

[0008] 5. The existing on-board power supply system cannot fully meet the diverse and high reliability requirements of on-board equipment.

[0009] Therefore, the above-mentioned defects in the prior art are technical problems that need to be solved urgently. Summary of the Invention

[0010] The present invention provides a combined high-power and multi-voltage vehicle-mounted power control system and control method, aiming to solve the above-mentioned defects existing in the prior art.

[0011] One aspect of the present invention relates to a combined high-power and multi-voltage vehicle-mounted power control system, comprising a first voltage balancing module, a second voltage balancing module, a first energy storage module, a second energy storage module, a third energy storage module, a fourth energy storage module and a coordinated control module, wherein the first energy storage module and the second energy storage module are connected in parallel to form the output end of the first vehicle-mounted energy storage supply circuit; the third energy storage module and the fourth energy storage module are connected in parallel to form the output end of the second vehicle-mounted energy storage supply circuit; the first energy storage circuit and the second energy storage circuit are connected in series to form the output end of the third vehicle-mounted energy storage supply circuit; the input end of the coordinated control module is respectively connected to the output end of the first vehicle-mounted energy storage supply circuit, the output end of the second vehicle-mounted energy storage supply circuit and the output end of the third vehicle-mounted energy storage supply circuit. The output ends of the circuit are connected, and the output ends of the collaborative control module are respectively connected to the first voltage balancing module and the second voltage balancing module; the collaborative control module is used to control the operation of the first voltage balancing module and the second voltage balancing module according to the detected voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit and the voltage detection value of the output end of the third vehicle-mounted energy storage supply circuit. If it is detected that the voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit is less than the preset first voltage threshold, the first voltage balancing module is turned off; if it is detected that the difference between the voltage detection value of the output end of the third vehicle-mounted energy storage supply circuit and the voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit is less than the preset first voltage threshold, the second voltage balancing module is turned off.

[0012] Furthermore, the combined high-power and multi-voltage on-board power control system also includes a first input port, a second input port, a third input port, a fourth input port, a fifth input port and a sixth input port, a first charging port, a second charging port, a third charging port, a fourth charging port, a first output port, a second output port and a third output port, the first voltage balancing module includes a first DC / DC module, the second voltage balancing module includes a second DC / DC module, the first energy storage module includes a first power battery, the second energy storage module includes a second power battery, the third energy storage module includes a third power battery, and the fourth energy storage module includes a fourth power battery. The first charging port is connected to the first power battery and is used as a charging port for the first power battery; the second charging port is connected to the second power battery and is used as a charging port for the second power battery. ; The third charging port is connected to the third power battery and is used as a charging port for the third power battery. The fourth charging port is connected to the fourth power battery and is used as a charging port for the fourth power battery. The first input port is respectively connected to the negative terminal of the first power battery and the negative terminal of the second power battery. The second input port is connected to the positive terminal of the first power battery. The third input port is connected to the positive terminal of the second power battery. The fourth input port is respectively connected to the negative terminal of the third power battery and the negative terminal of the fourth power battery. The fifth input port is connected to the positive terminal of the third power battery. The sixth input port is connected to the positive terminal of the fourth power battery. The first output port is connected to the first input port, the second output port is connected to the fourth input port, and the third output port is respectively connected to the output terminal of the third energy storage module and the output terminal of the fourth energy storage module.

[0013] Furthermore, the collaborative control module is connected to the first DC / DC module and the second DC / DC module respectively, and is used to start the second DC / DC module if it is detected that the difference between the voltage detection value of the output end of the third on-board energy storage supply circuit and the voltage detection value of the output end of the second on-board energy storage supply circuit is greater than a preset first voltage threshold; if it is identified that the voltage detection value of the output end of the second on-board energy storage supply circuit is greater than the preset first voltage threshold, then start the first DC / DC module.

[0014] Furthermore, the first DC / DC module and the second DC / DC module each include a DC / DC module main circuit, a DC / DC module auxiliary power supply circuit, a DC / DC module detection and protection circuit, a DC / DC module regulation circuit, and a DC / DC module PWM control circuit. The DC / DC module auxiliary power supply circuit is respectively connected to the DC / DC module main circuit, the DC / DC module detection and protection circuit, the DC / DC module regulation circuit, and the DC / DC module PWM control circuit, and is used to serve as a working power supply for the DC / DC module main circuit, the DC / DC module detection and protection circuit, the DC / DC module regulation circuit, and the DC / DC module PWM control circuit.

[0015] Further, the main circuit of the DC / DC module includes a push-pull conversion circuit, a bridge rectifier circuit, an LC filter circuit, and a current-voltage conversion circuit connected in sequence.

[0016] Further, the detection and protection circuit of the DC / DC module includes a voltage detection and isolation circuit, a voltage reference generation circuit, and an overload protection signal formation circuit connected in sequence.

[0017] Further, the regulation circuit of the DC / DC module includes a voltage set signal formation circuit and a PID control signal generation circuit connected in sequence.

[0018] Further, the PWM control circuit of the DC / DC module includes a PWM pulse formation circuit and a pulse drive circuit connected in sequence.

[0019] Further, the cooperative control module includes an auxiliary power supply circuit, a voltage detection circuit, and a control circuit connected in sequence.

[0020] Another aspect of the present invention relates to a combined high-power and multi-voltage vehicle-mounted power control method, which is applied to the above-mentioned combined high-power and multi-voltage vehicle-mounted power control system. The combined high-power and multi-voltage vehicle-mounted power control method includes the following steps:

[0021] Detect the voltage detection value UG2 at the output end of the second vehicle-mounted energy storage supply circuit and the voltage detection value UG3 at the output end of the third vehicle-mounted energy storage supply circuit;

[0022] According to the voltage detection value UG2 at the output end of the second vehicle-mounted energy storage supply circuit and the voltage detection value UG3 at the output end of the third vehicle-mounted energy storage supply circuit, calculate the first voltage detection value UL and the second voltage detection value UH, where UL = UG2 and UH = UG3 - UG2;

[0023] If it is recognized that UL < Umin, then turn off the first DC / DC module, where Umin is a preset first voltage threshold;

[0024] If it is recognized that UH < Umin, then turn off the second DC / DC module;

[0025] If it is recognized that UH - UL > ΔU, then adjust the values of K1 and K2, where K1 is the first adjustment value, K2 is the second adjustment value, and ΔU is a preset second voltage threshold;

[0026] If it is recognized that UL - UH > ΔU, then adjust the values of K2 and K1.

[0027] The beneficial effects achieved by the present invention are:

[0028] The present invention provides a combined high-power and multi-voltage vehicle-mounted electric energy control system and control method, which adopts a first voltage balancing module, a second voltage balancing module, a first energy storage module, a second energy storage module, a third energy storage module, a fourth energy storage module and a coordinated control module. The first energy storage module and the second energy storage module are connected in parallel to form the output end of the first vehicle-mounted energy storage supply circuit; the third energy storage module and the fourth energy storage module are connected in parallel to form the output end of the second vehicle-mounted energy storage supply circuit; the first energy storage circuit and the second energy storage circuit are connected in series to form the output end of the third vehicle-mounted energy storage supply circuit; the input end of the coordinated control module is connected to the output end of the first vehicle-mounted energy storage supply circuit, the output end of the second vehicle-mounted energy storage supply circuit and the output end of the third vehicle-mounted energy storage supply circuit respectively. The output end of the cooperative control module is connected to the first voltage balancing module and the second voltage balancing module respectively; the cooperative control module is used to control the operation of the first voltage balancing module and the second voltage balancing module according to the detected voltage detection value of the output end of the second on-board energy storage supply circuit and the voltage detection value of the output end of the third on-board energy storage supply circuit. If it is detected that the voltage detection value of the output end of the second on-board energy storage supply circuit is less than the preset first voltage threshold, the first voltage balancing module is turned off; if it is detected that the difference between the voltage detection value of the output end of the third on-board energy storage supply circuit and the voltage detection value of the output end of the second on-board energy storage supply circuit is less than the preset first voltage threshold, the second voltage balancing module is turned off.

[0029] The combined high-power and multi-voltage vehicle-mounted power control system and control method provided by the present invention have the following beneficial effects:

[0030] (1) The vehicle-mounted power supply system is built in a modular combination, and standard modules can be fully utilized to build a vehicle-mounted power supply system that meets personalized needs.

[0031] (2) Constructing an on-board power supply system by connecting energy storage modules in series and parallel can greatly improve the on-board power supply capacity and output power as well as the reliability and flexibility of the on-board power supply.

[0032] (3) Each energy storage module is equipped with an independent charging interface, and multiple power batteries can be charged at the same time, which can greatly improve the charging speed of on-board energy storage.

[0033] (4) The system output adopts a three-terminal output method with an intermediate tap, with two or three voltage levels of output, which can simultaneously meet the application requirements of two or three different voltage levels of vehicle-mounted equipment, facilitating the gradual transition of vehicle-mounted equipment in the process of continuous improvement of power battery voltage levels.

[0034] (5) Automatic current sharing of parallel energy storage modules is achieved through nonlinear thermistors to improve reliability.

[0035] (6) Automatic voltage balancing of parallel energy storage modules is achieved through unidirectional isolation diodes.

[0036] (7) Automatic voltage balancing of series-connected energy storage modules is achieved through adaptive control of the output voltage of the DC / DC module.

[0037] (8) The bypass diode can realize the continuous current when the module is abnormal, thereby ensuring the uninterrupted power supply of the vehicle.

[0038] (9) The unidirectional isolation diode is used to achieve directional flow of energy, so that each module can work relatively independently and isolate negative impacts.

[0039] (10) The combination of multiple energy storage modules and multiple voltage output ports improves the reliability of on-board power supply.

[0040] (11) By directional controlling the flow of electric energy through the isolation diode, the performance of the power battery can be optimized and some losses can be reduced.

[0041] (12) The performance and reliability of the vehicle power supply system can be improved by equalizing the voltage and current of the energy storage module.

[0042] (13) The collaborative control module uses dual power supply modules in parallel, each with different inputs, which improves the reliability of collaborative control.

[0043] (14) The current is detected by detecting the potential difference, which avoids the difficulty of directly detecting small signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a functional block diagram of the combined high-power and multi-voltage vehicle-mounted power control system of the present invention;

[0045] Figure 2 This is a circuit diagram of the combined high-power and multi-voltage vehicle-mounted power control system of the present invention;

[0046] Figure 3 This is a circuit diagram of the main circuit of the DC / DC module of the present invention;

[0047] Figure 4 This is a circuit diagram of the auxiliary power supply circuit of the DC / DC module of the present invention;

[0048] Figure 5 This is a circuit diagram of a DC / DC module detection and protection circuit of the present invention;

[0049] Figure 6 This is a circuit diagram of a DC / DC module regulation circuit of the present invention;

[0050] Figure 7 This is a circuit diagram of a PWM control circuit of a DC / DC module of the present invention;

[0051] Figure 8 Schematic diagram of the circuit of the collaborative control module of the present invention;

[0052] Figure 9 Schematic diagram of the flow of the combined high-power and multi-voltage vehicle-mounted power control method of the present invention.

[0053] Description of Figure Numbers:

[0054] 10. First voltage balancing module; 20. Second voltage balancing module; 30. First energy storage module; 40. Second energy storage module; 50. Third energy storage module; 60. Fourth energy storage module; 70. Coordinated control module; 11. First DC / DC module; 21. Second DC / DC module; 31. First power battery; 41. Second power battery; 51. Third power battery; 61. Fourth power battery. DETAILED DESCRIPTION

[0055] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0056] like Figure 1 As shown, the present invention proposes a combined high-power and multi-voltage vehicle-mounted power control system, including a first voltage balancing module 10, a second voltage balancing module 20, a first energy storage module 30, a second energy storage module 40, a third energy storage module 50, a fourth energy storage module 60 and a cooperative control module 70. The first energy storage module 30 and the second energy storage module 40 are connected in parallel to form the output end of the first vehicle-mounted energy storage supply circuit; the third energy storage module 50 and the fourth energy storage module 60 are connected in parallel to form the output end of the second vehicle-mounted energy storage supply circuit; the first energy storage circuit and the second energy storage circuit are connected in series to form the output end of the third vehicle-mounted energy storage supply circuit; the input end of the cooperative control module 70 is respectively connected to the output end of the first vehicle-mounted energy storage supply circuit, the output end of the second vehicle-mounted energy storage supply circuit and the output end of the third vehicle-mounted energy storage supply circuit. The output end of the energy storage supply circuit is connected, and the output end of the collaborative control module 70 is connected to the first voltage balancing module 10 and the second voltage balancing module 20 respectively; the collaborative control module 70 is used to control the operation of the first voltage balancing module 10 and the second voltage balancing module 20 according to the detected voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit and the voltage detection value of the output end of the third vehicle-mounted energy storage supply circuit. If it is detected that the voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit is less than the preset first voltage threshold, the first voltage balancing module 10 is turned off; if it is detected that the difference between the voltage detection value of the output end of the third vehicle-mounted energy storage supply circuit and the voltage detection value of the output end of the second vehicle-mounted energy storage supply circuit is less than the preset first voltage threshold, the second voltage balancing module 20 is turned off. In this embodiment, the first voltage balancing module 10, the second voltage balancing module 20, the first energy storage module 30, the second energy storage module 40, the third energy storage module 50, the fourth energy storage module 60 and the collaborative control module 70 can all adopt existing modules.

[0057] In the above structure, see Figures 1 to 8 The combined high-power and multi-voltage vehicle-mounted power control system provided in this embodiment also includes a first input port G01, a second input port A01, a third input port B01, a fourth input port G02, a fifth input port A02, and a sixth input port B02; a first charging port G01-A01, a second charging port G01-B01, a third charging port G02-A02, a fourth charging port G02-B02; a first output port G11-G12, a second output port G12-G13, and a third output port G11-G13; a first voltage balancing module 10 includes a first DC / DC module 11; a second voltage balancing module 20 includes a second DC / DC module 21; a first energy storage module 30 includes a first power battery 31; a second energy storage module 40 includes a second power battery 41; a third energy storage module 50 includes a third power battery 51; and a fourth energy storage module 60 includes a fourth power battery 61; the first charging port is connected to the first power battery 31 and is used as a charging port for the first power battery 31. The second charging port is connected to the second power battery 41 and is used as a charging port for the second power battery 41; the third charging port is connected to the third power battery 51 and is used as a charging port for the third power battery 51; the fourth charging port is connected to the fourth power battery 61 and is used as a charging port for the fourth power battery 61; the first input port is connected to the negative terminal of the first power battery 31 and the negative terminal of the second power battery 41 respectively, the second input port is connected to the positive terminal of the first power battery 31, the third input port is connected to the positive terminal of the second power battery 41, and the fourth input port is connected to the negative terminal of the third power battery 51 and the negative terminal of the fourth power battery 61 respectively; the fifth input port is connected to the positive terminal of the third power battery 51, and the sixth input port is connected to the positive terminal of the fourth power battery 61; the first output port is connected to the first input port, the second output port is connected to the fourth input port, and the third output port is connected to the output terminal of the third energy storage module 50 and the output terminal of the fourth energy storage module 60 respectively.

[0058] like Figure 1 and Figure 2As shown, the combined high-power and multi-voltage on-vehicle power control system provided in this embodiment is composed of a first power battery 31, a second power battery 41, a third power battery 51, a fourth power battery 61, a first DC / DC module 11, a second DC / DC module 21, a coordinated control module 70, a thermistor PTC1, a thermistor PTC2, a thermistor PTC3, a thermistor PTC4, a unidirectional isolation diode D1, a unidirectional isolation diode D2, a unidirectional isolation diode D3, a unidirectional isolation diode D4, a unidirectional isolation diode D5, a unidirectional isolation diode D6, a bypass diode D7, a bypass diode D8, a bypass diode D9, a bypass diode D10, etc. The system has two groups of input ports: G01-A01-B01 is the first group of charging ports, and G02-A02-B02 is the second group of charging ports, which can form four charging ports, namely G01-A01, G01-B01, G02-A02, and G02-B02 respectively; the system has one group of output ports: G11-G12-G13, which can form three output ports, namely G11-G12, G12-G13, and G11-G13 respectively. The first power battery 31 is connected in series with thermistor PTC1 and unidirectional isolation diode D1, and then in parallel with bypass diode D7, forming the first energy storage module 30. The second power battery 41 is connected in series with thermistor PTC2 and unidirectional isolation diode D2, and then in parallel with bypass diode D8, forming the second energy storage module 40. The third power battery 51 is connected in series with thermistor PTC3 and unidirectional isolation diode D3, and then in parallel with bypass diode D9, forming the third energy storage module 50. The fourth power battery 61 is connected in series with thermistor PTC4 and unidirectional isolation diode D4, and then in parallel with bypass diode D10, forming the fourth energy storage module 60. The first energy storage module 30 is connected in parallel with the second energy storage module 40, and the third energy storage module 50 is connected in parallel with the fourth energy storage module 60. The two parallel energy storage modules are then connected in series. The first DC / DC module 11 is connected to the unidirectional isolation diode D6 to form the first voltage-balancing module 10, with its input connected to the G11-G12 ports and its output connected to the G12-G13 ports. The second DC / DC module 21 is connected to D5 to form the second voltage-balancing module 20, with its input connected to the G12-G13 ports and its output connected to the G11-G12 ports. The three input terminals of the coordinated control module are connected to G11, G12, and G13, respectively, and two sets of output control signals are connected to the first DC / DC module 11 and the second DC / DC module 21, respectively. The first input port G01 is connected to the negative terminals of the third power battery 51 and the fourth power battery 61, the second input port A01 is connected to the positive terminal of the third power battery 51, and the third input port B01 is connected to the positive terminal of the fourth power battery 61. The fourth input port G02 is connected to the negative terminals of the first power battery 31 and the second power battery 41, the fifth input port A02 is connected to the positive terminal of the first power battery 31, and the sixth input port B02 is connected to the positive terminal of the second power battery 41.The system output terminal G11 is connected to the first input port G01 , the system output terminal G12 is connected to the fourth input port G02 , and the system output terminal G13 is connected to the parallel end of the unidirectional isolation diode D1 and the unidirectional isolation diode D2 .

[0059] The series-parallel combination of the system's energy storage modules is responsible for high-power on-board energy storage in electric vehicles. The DC / DC module with an external control interface is responsible for the series voltage balancing of the energy storage module combination. The PTC resistor is responsible for the parallel current balancing of the energy storage module combination. The unidirectional isolation diode is responsible for power flow control. The parallel bypass diode provides a freewheeling channel. The collaborative control module is responsible for the energy storage balance and coordinated control of the power battery.

[0060] Further, see Figures 1 to 8 In the combined high-power and multi-voltage on-board power control system provided in this embodiment, the coordinated control module 70 is connected to the first DC / DC module 11 and the second DC / DC module 21, respectively, and is configured to activate the second DC / DC module 21 if the difference between the voltage detection value at the output end of the third on-board energy storage supply circuit and the voltage detection value at the output end of the second on-board energy storage supply circuit is detected to be greater than a preset first voltage threshold; and to activate the first DC / DC module 11 if the voltage detection value at the output end of the second on-board energy storage supply circuit is identified to be greater than the preset first voltage threshold.

[0061] The coordinated control module 70 completes the coordinated control of the combined high-power and multi-voltage vehicle-mounted power supply circuit, and coordinates the operating status and output voltage of the first DC / DC module 11 and the second DC / DC module 21 according to the detection information. The coordinated control module circuit is as follows Figure 8As shown, the system consists of an auxiliary power supply circuit, a voltage detection circuit, and a control circuit. The auxiliary power supply circuit comprises isolated switching power supply modules PM1 and PM2, unidirectional isolation diodes D11 and D12, filter capacitors E1 and C1, a linear power supply module PM3, and filter capacitors E2 and C2. PM1 uses UG2 as its input, while PM2 uses UG3 as its input. The outputs of PM1 and PM2 are connected in parallel through isolation diodes D1 and D2 to form a 5V operating power supply for the detection circuit. The linear power supply module converts the 5V operating power supply to 3.3V, which powers the digital signal processing module DSPM1. The detection circuit, consisting of optocouplers O1 and O2, resistors R1 and R2, potentiometers RW1 and RW2, and capacitors C4 and C5, electrically isolates and detects voltages UG2 and UG3, respectively, and transmits them to the AD terminal of DSPM1. The control circuit consists of a general digital signal processing module DSPM1, a capacitor combination E3-C3, etc., and generates output control signals K1 and K2 based on the detection values of voltages UG2 and UG3, which are sent to the first DC / DC module 11 and the second DC / DC module 21 via the DA port of DSPM1 respectively. These signals serve as the voltage reference signal K12 of the first DC / DC module 11 and the second DC / DC module 21 (the first DC / DC module 11 is connected to K1, and the second DC / DC module 21 is connected to K2), thereby adjusting the output voltages of the first DC / DC module 11 and the second DC / DC module 21.

[0062] The coordinated control module 70 controls the first DC / DC module 11 and the second DC / DC module 21 based on the voltage detection values UG2 and UG3 at the system output, and calculates and controls the first adjustment value K1 and the second adjustment value K2. When it is detected that (UG3-UG2) is higher than a certain value of UG2, the second DC / DC module 21 starts up and converts the energy at the G12-G13 port to the G11-G12 port for output. When it is detected that UG2 is higher than a certain value of (UG3-UG2), the first DC / DC module 11 starts up and converts the energy at the G11-G12 port to the G12-G13 port for output, thereby achieving voltage balancing for the series-connected energy storage modules.

[0063] Preferably, see Figures 1 to 8In the combined high-power and multi-voltage vehicle-mounted power control system provided in this embodiment, the first DC / DC module 11 and the second DC / DC module 21 each include a DC / DC module main circuit, a DC / DC module auxiliary power supply circuit, a DC / DC module detection and protection circuit, a DC / DC module regulation circuit, and a DC / DC module PWM control circuit. The DC / DC module auxiliary power supply circuit is connected to the DC / DC module main circuit, the DC / DC module detection and protection circuit, the DC / DC module regulation circuit, and the DC / DC module PWM control circuit, respectively, and serves as the working power supply for the DC / DC module main circuit, the DC / DC module detection and protection circuit, the DC / DC module regulation circuit, and the DC / DC module PWM control circuit. The DC / DC module auxiliary power supply circuit is composed of isolated switching power supply modules PM4 and PM5 and filter capacitors, such as Figure 3 The PM4-E6-C9 converts the DC input to 18V DC, which serves as the operating power supply for the DC / DC module's protection, regulation, and control circuits. The PM5-E7-C10 converts the DC input to 15V DC, which serves as the operating power supply for the driver chip in the DC / DC module's control circuit.

[0064] Specifically, see Figures 1 to 8 In the combined high-power and multi-voltage vehicle-mounted power control system provided in this embodiment, the DC / DC module main circuit includes a push-pull conversion circuit, a bridge rectifier circuit, an LC filter circuit, and a current-voltage conversion circuit connected in sequence. The DC / DC module main circuit is composed of a push-pull conversion switch tube, a transformer, a bridge rectifier circuit, an LC filter circuit, a sampling resistor, etc. Figure 3 As shown in the figure, switches Q1-Q2 and windings 12 and 34 of transformer T1 form a push-pull converter circuit. D15-D18 form a bridge rectifier circuit. L1-E4-E5-C8 form an LC filter circuit. R7 is a current sampling resistor. The push-pull converter circuit converts DC to high-frequency AC. The transformer provides electrical isolation and high-frequency AC voltage conversion. The bridge rectifier circuit converts high-frequency AC to pulsating DC. The LC filter converts pulsating DC to DC output. Sampling resistor R7 converts the output current to voltage (UO1-UO+).

[0065] Further, see Figures 1 to 8 In the combined high-power and multi-voltage vehicle-mounted power control system provided in this embodiment, the DC / DC module detection and protection circuit includes a voltage detection and isolation circuit, a voltage reference generation circuit, and an overload protection signal formation circuit connected in sequence. The DC / DC module detection and protection circuit is composed of voltage detection and isolation, voltage reference generation, protection signal formation, etc. Figure 4As shown in the figure, the voltage detection and isolation section implements signal detection and electrical isolation. The voltage reference generation section generates a comparison reference for the protection signal, and the protection signal generation section generates the protection signal through comparison. O3-R8-RW3 detects and electrically isolates the DC voltage UO1, while O4-R9-RW4 detects and electrically isolates the DC voltage UO+. R10-Z1-C11 generates the common reference voltage, RW5-C11 generates the overtemperature protection reference voltage TH, RW6-C13 generates the output overcurrent protection reference voltage IOH, and RW7-C14 generates the output overvoltage protection reference voltage UOH. U2B-R11-R12-R13 converts the voltage detection value into the output current detection value IOF. U2A compares the output current with the overcurrent protection reference voltage. In the event of overcurrent, the overcurrent protection signal is generated and output through unidirectional isolation of D20. U1A compares the output voltage detection value UO1F with the overvoltage reference voltage. In the event of overvoltage, the output overvoltage protection signal is generated and output through unidirectional isolation of D19. RT1 and RT2 are temperature switches. RT1-R14-D22 detects the temperature at the switches Q1-Q2-D23, while RT2-R15 detects the temperature at the bridge rectifier. U1B compares the detected temperature value with the overtemperature protection reference. In the event of an overtemperature condition, an overtemperature protection signal is generated and output after unidirectional isolation via D21. The overtemperature, overvoltage, and overcurrent protection signals are then unidirectionally isolated via diodes and aggregated into a fault protection signal, FAULT, which is sent to the control circuit to promptly shut down the control pulses.

[0066] Preferably, see Figures 1 to 8 In the combined high-power and multi-voltage vehicle-mounted power control system provided in this embodiment, the DC / DC module regulation circuit includes a voltage given signal forming circuit and a PID control signal generating circuit connected in sequence. The DC / DC module regulation circuit is composed of a voltage given signal forming circuit, a PID control signal generating circuit, and other components, such as Figure 6 As shown in the figure, the voltage reference signal generation section generates a reference signal corresponding to the DC / DC output, and the PID control section generates a corresponding control signal based on the reference signal and feedback. U3B-R16-R17-R18 converts the current signal from the coordinated control module's DC / DC regulation module into a voltage signal, which serves as the DC / DC output voltage reference signal UG. U3A-R19-R21-C15-R22-C16-C17 performs PID calculation on the error between the voltage reference signal and the voltage feedback signal to generate the control signal EU+ for the control circuit, which adjusts the output PWM pulse width of the control circuit. R20-Z1-Q3 performs amplitude limiting and compensation on the PID output signal to ensure that the control signal EU+ is reliable and accurate.

[0067] Further, see Figures 1 to 8In the combined high-power and multi-voltage vehicle-mounted power control system provided in this embodiment, the DC / DC module PWM control circuit includes a PWM pulse forming circuit and a pulse driving circuit connected in sequence. The DC / DC module PWM control circuit is composed of PWM pulse forming, pulse driving and other parts, such as Figure 7 As shown in the figure, the PWM pulse generation section determines the output and width of the control pulse based on the fault signal FAULT and the control signal EU+. When the fault signal FAULT is active, the control pulse output is stopped. When the fault signal is inactive, a PWM control pulse of a corresponding width is output based on the EU+ value. The pulse drive section provides electrical isolation of the pulses and enhances the drive capability. The dedicated chip UC3875 serves as the core of the PWM pulse generation. E9-C18 provides filtering and energy storage for the UC3875's operating power supply, R23-C20 provides slope compensation for the UC3875, C21-C22 configures the UC3875's soft-start function, R28-C25 configures the UC3875's operating frequency, and R26-C23 and R28-C25 configure the UC3875's phase shift. The PWM pulse A output by UC3875 is electrically isolated by O6-R32-R33 and the driving capability is enhanced by U6-E11-R34 to form the control pulse PQ1 and send it to the main circuit control switch tube Q1; the PWM pulse C output by UC3875 is electrically isolated by O5-R29-R30 and the driving capability is enhanced by U5-E10-R31 to form the control pulse PQ2 and send it to the main circuit control switch tube Q2.

[0068] Preferably, see Figures 1 to 8 In the combined high-power and multi-voltage vehicle-mounted power control system provided in this embodiment, the coordinated control module 70 includes an auxiliary power supply circuit, a voltage detection circuit, and a control circuit connected in sequence. The coordinated control module 70 completes the coordinated control of the combined high-power and multi-voltage vehicle-mounted power supply circuit, and coordinates the operating status and output voltage of the first DC / DC module 11 and the second DC / DC module 21 according to the detection information. The coordinated control module circuit is as follows: Figure 8As shown in the figure, it consists of an auxiliary power supply circuit, a voltage detection circuit, a control circuit, etc. The auxiliary power supply circuit consists of isolated switching power supply modules PM1 to PM2, unidirectional isolation diodes D11 to D12, filter capacitor combinations E1 - C1, a linear power supply module PM3, filter capacitor combinations E2 - C2, etc. PM1 takes UG2 as the input, PM2 takes UG3 as the input, and the outputs of PM1 and PM2 are connected in parallel through isolation diodes D1 and D2 to form a 5V working power supply to supply power to the detection circuit; the linear power supply module converts the 5V working power supply into a 3.3V working power supply to supply power to the digital signal processing module DSPM1. The detection circuit consists of optocouplers O1 to O2, resistors R1 to R2, potentiometers RW1 to RW2, capacitors C4 to C5, etc., which electrically isolate and detect the voltages UG2 and UG3 respectively, and send them to the AD terminal of DSPM1. The control circuit consists of a general - purpose digital signal processing module DSPM1, capacitor combinations E3 - C3, etc., forms output control signals, the first adjustment value K1 and the second adjustment value K2 according to the detected values of the voltages UG2 and UG3, and sends them to the first DC / DC module 11 and the second DC / DC module 21 through the DA port of DSPM1 respectively, as the voltage given signals K12 of the first DC / DC module 11 and the second DC / DC module 21 (the first DC / DC module 11 is connected to K1, and the second DC / DC module 21 is connected to K2), to adjust the output voltages of the first DC / DC module 11 and the second DC / DC module 21.

[0069] Please refer to Figure 9 , the present invention also provides a combined high - power and multi - voltage vehicle - mounted power control method, which is applied to the above - mentioned combined high - power and multi - voltage vehicle - mounted power control system. The combined high - power and multi - voltage vehicle - mounted power control method includes the following steps:

[0070] Step S100: Detect the voltage detection value UG2 at the output end of the second vehicle - mounted energy storage supply circuit and the voltage detection value UG3 at the output end of the third vehicle - mounted energy storage supply circuit.

[0071] The coordinated control module completes the coordinated control of the combined high - power and multi - voltage vehicle - mounted power supply circuit, and coordinately controls the operating states and output voltages of the first DC / DC module and the second DC / DC module according to the detection information.

[0072] Step S200: Calculate the first voltage detection value UL and the second voltage detection value UH according to the voltage detection value UG2 at the output end of the second vehicle - mounted energy storage supply circuit and the voltage detection value UG3 at the output end of the third vehicle - mounted energy storage supply circuit, where UL = UG2 and UH = UG3 - UG2.

[0073] Step S300: If it is recognized that UL < Umin, then turn off the first DC / DC module, where Umin is a preset first voltage threshold.

[0074] When it is detected that (UG3 - UG2) is higher than UG2 by a certain value, the second DC / DC module 21 is started, and the energy of the G12 - G13 port is converted to the output of the G11 - G12 port.

[0075] Step S400: If it is recognized that UH < Umin, the second DC / DC module is turned off.

[0076] When it is detected that UG2 is higher than (UG3 - UG2) by a certain value, the first DC / DC module 11 is started, and the energy of the G11 - G12 port is converted to the output of the G12 - G13 port, so as to achieve voltage equalization of the series energy storage module.

[0077] Step S500: If it is recognized that UH - UL > ΔU, the values of K1 and K2 are adjusted, where K1 is the first adjustment value, K2 is the second adjustment value, and ΔU is the preset second voltage threshold.

[0078] According to the detected values of voltages UG2 and UG3, the output control signals, the first adjustment value K1 and the second adjustment value K2, are formed and sent to the first DC / DC module and the second DC / DC module through the DA port of DSPM1 respectively, as the voltage given signals K12 (the first DC / DC module is connected to K1, and the second DC / DC module is connected to K2) of the first DC / DC module and the second DC / DC module, to adjust the output voltages of the first DC / DC module and the second DC / DC module.

[0079] When it is recognized that UH - UL > ΔU, the first DC / DC module is connected to K1, and the second DC / DC module is connected to K2, to adjust the output voltages of the first DC / DC module and the second DC / DC module.

[0080] Step S600: If it is recognized that UL - UH > ΔU, the values of K2 and K1 are adjusted.

[0081] When it is recognized that UL - UH > ΔU, the first DC / DC module is connected to K2, and the second DC / DC module is connected to K1, to adjust the output voltages of the first DC / DC module and the second DC / DC module.

[0082] As Figures 1 to 9 shown, for the combined high - power and multi - voltage vehicle - mounted electrical energy control system and control method provided in this embodiment, its working principle is as follows:

[0083] In Figure 2 the block diagram of the combined high - power and multi - voltage vehicle - mounted electrical energy supply circuit and control system shown, the signal descriptions between each component module are as follows:

[0084] G01, A01, B01: charging input terminals of the first power battery 31 and the second power battery 41. G01-A01 are charging input terminals of the first power battery 31, and G01-B01 are charging input terminals of the second power battery 41.

[0085] G02, A02, B02: charging input terminals of the third power battery 51 and the fourth power battery 61. G02-A02 is the charging input terminal of the third power battery 51, and G02-B02 is the charging input terminal of the fourth power battery 61;

[0086] G11: Low potential terminal of the on-board energy storage supply circuit output;

[0087] G12: The intermediate potential terminal of the on-board energy storage supply circuit output;

[0088] G13: High potential terminal of the on-board energy storage supply circuit output;

[0089] UG1: The potential of the output terminal G11 of the on-board energy storage supply circuit;

[0090] UG2: The potential of the output terminal G12 of the on-board energy storage supply circuit;

[0091] UG3: The potential of the output terminal G13 of the on-board energy storage supply circuit;

[0092] GND: Control signal reference potential of collaborative control module;

[0093] K1: external control signal of the collaborative control module controlling the first DC / DC module 11;

[0094] K2: The collaborative control module controls the external control signal of the second DC / DC module 21.

[0095] (2) Working principle of combined high-power and multi-voltage vehicle power supply circuit and control system

[0096] (1) Realization of high current, high voltage, and high power energy storage

[0097] The first power battery 31 is connected in series with thermistor PTC1 and a one-way isolation diode D1, then in parallel with a bypass diode D7, forming the first energy storage module 30. The second power battery 41 is connected in series with thermistor PTC2 and a one-way isolation diode D2, then in parallel with a bypass diode D8, forming the second energy storage module 40. The third power battery 51 is connected in series with thermistor PTC3 and a one-way isolation diode D3, then in parallel with a bypass diode D9, forming the third energy storage module 50. The fourth power battery 61 is connected in series with thermistor PTC4 and a one-way isolation diode D4, then in parallel with a bypass diode D10, forming the energy storage module 4. The first energy storage module 30 is connected in parallel with the second energy storage module 40, and the third energy storage module 50 is connected in parallel with the fourth energy storage module 60. These two parallel energy storage modules are then connected in series. The parallel connection of the energy storage modules increases the rated output current, while the series connection of the energy storage modules increases the rated output voltage, significantly improving the power of the vehicle's power supply circuit.

[0098] (2) Implementation of fast charging

[0099] Each power battery is equipped with an independent charger access port. G01-A01 is the charging port for the first power battery 31, G01-B01 is the charging port for the second power battery 41, G02-A02 is the charging port for the third power battery 51, and G02-B02 is the charging port for the fourth power battery 61. All four power batteries can be charged simultaneously, enabling rapid charging of the vehicle's energy storage.

[0100] (3) Implementation of parallel current and voltage sharing

[0101] Nonlinear thermistors PTC1-PTC4 are connected in series with power batteries 1-4, 61. The nonlinear PTC resistors increase their resistance sharply at rated current, limiting current and achieving a certain degree of current sharing. Unidirectional isolation diodes D1-D4 are connected in series with power batteries 41-4, 61, respectively. The voltages of the individual branches within the parallel module suppress each other, ensuring that the residual voltages of the power batteries in the parallel energy storage modules are consistent.

[0102] (4) Implementation of series voltage balancing

[0103] The input and output of the DC / DC module are cross-connected to the multi-voltage output terminals of the on-board power supply circuit. Through the system control module, when it is detected that (UG3-UG2) is higher than a certain value of UG2, the second DC / DC module 21 is started and the energy of the G12-G13 port is converted to the output of the G11-G12 port. When it is detected that UG2 is higher than a certain value of (UG3-UG2), the first DC / DC module 11 is started and the energy of the G11-G12 port is converted to the output of the G12-G13 port, thereby achieving voltage balancing of the series-connected energy storage modules.

[0104] (5) Implementation of power flow control

[0105] The unidirectional diodes D1 to D6 enable directional power flow, so that each power battery and conversion module can work relatively independently and the state can be controlled.

[0106] (6) Multi-voltage output implementation

[0107] The system consists of two groups of energy storage modules connected in series, providing three output terminals, G11, G12, and G13, which can form three pairs of DC output ports, G11-G12, G12-G13, and G11-G13, providing high and low output voltages, and is suitable for high and low voltage vehicle-mounted equipment.

[0108] Compared with the prior art, the combined high-power and multi-voltage vehicle-mounted power control system and control method provided in this embodiment have the following beneficial effects:

[0109] (1) The vehicle-mounted power supply system is built in a modular combination, and standard modules can be fully utilized to build a vehicle-mounted power supply system that meets personalized needs.

[0110] (2) Constructing an on-board power supply system by connecting energy storage modules in series and parallel can greatly improve the on-board power supply capacity and output power as well as the reliability and flexibility of the on-board power supply.

[0111] (3) Each energy storage module is equipped with an independent charging interface, and multiple power batteries can be charged at the same time, which can greatly improve the charging speed of on-board energy storage.

[0112] (4) The system output adopts a three-terminal output method with an intermediate tap, with two or three voltage levels of output, which can simultaneously meet the application requirements of two or three different voltage levels of vehicle-mounted equipment, facilitating the gradual transition of vehicle-mounted equipment in the process of continuous improvement of power battery voltage levels.

[0113] (5) Automatic current sharing of parallel energy storage modules is achieved through nonlinear thermistors to improve reliability.

[0114] (6) Automatic voltage balancing of parallel energy storage modules is achieved through unidirectional isolation diodes.

[0115] (7) Automatic voltage balancing of series-connected energy storage modules is achieved through adaptive control of the output voltage of the DC / DC module.

[0116] (8) The bypass diode can realize the continuous current when the module is abnormal, thereby ensuring the uninterrupted power supply of the vehicle.

[0117] (9) The unidirectional isolation diode is used to achieve directional flow of energy, so that each module can work relatively independently and isolate negative impacts.

[0118] (10) The combination of multiple energy storage modules and multiple voltage output ports improves the reliability of on-board power supply.

[0119] (11) By directional controlling the flow of electric energy through the isolation diode, the performance of the power battery can be optimized and some losses can be reduced.

[0120] (12) The performance and reliability of the vehicle power supply system can be improved by equalizing the voltage and current of the energy storage module.

[0121] (13) The collaborative control module uses dual power supply modules in parallel, each with different inputs, which improves the reliability of collaborative control.

[0122] (14) The current is detected by detecting the potential difference, which avoids the difficulty of directly detecting small signals.

[0123] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the invention. Thus, the present invention is intended to include such changes and modifications as fall within the scope of the claims and their equivalents.

Claims

1. A combined high-power and multi-voltage vehicle-mounted power control system, characterized in that: The invention comprises a first pressure equalizing module (10), a second pressure equalizing module (20), a first energy storage module (30), a second energy storage module (40), a third energy storage module (50), a fourth energy storage module (60) and a coordinated control module (70), wherein the first energy storage module (30) and the second energy storage module (40) are connected in parallel to form a first on-board energy storage supply circuit output end; the third energy storage module (50) and the fourth energy storage module (60) are connected in parallel to form a second on-board energy storage supply circuit output end; the first on-board energy storage module (30) and the second on-board energy storage module (40) are connected in parallel to form a second on-board energy storage supply circuit output end; The energy supply circuit is connected in series with the second on-board energy storage supply circuit to form the output end of the third on-board energy storage supply circuit; the input end of the collaborative control module (70) is respectively connected to the output end of the first on-board energy storage supply circuit, the output end of the second on-board energy storage supply circuit and the output end of the third on-board energy storage supply circuit, and the output end of the collaborative control module (70) is respectively connected to the first equalizing module (10) and the second equalizing module (20); the input end of the first equalizing module (10) is connected to the output end of the third on-board energy storage supply circuit The output ends of the two on-board energy storage supply circuits are connected, and the output end of the first voltage balancing module (10) is connected in parallel to the output end of the first on-board energy storage supply circuit; the input end of the second voltage balancing module (20) is connected to the output end of the first on-board energy storage supply circuit, and the output end of the second voltage balancing module (20) is connected in parallel to the output end of the second on-board energy storage supply circuit; the collaborative control module (70) is used to control the actions of the first voltage balancing module (10) and the second voltage balancing module (20) according to the detected voltage detection value of the output end of the second on-board energy storage supply circuit and the voltage detection value of the output end of the third on-board energy storage supply circuit; if it is detected that the voltage detection value of the output end of the second on-board energy storage supply circuit is less than a preset first voltage threshold, the first voltage balancing module (10) is turned off; if it is detected that the difference between the voltage detection value of the output end of the third on-board energy storage supply circuit and the voltage detection value of the output end of the second on-board energy storage supply circuit is less than the preset first voltage threshold, the second voltage balancing module (20) is turned off.

2. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 1, characterized in that: The combined high-power and multi-voltage vehicle-mounted electric energy control system further comprises a first input port, a second input port, a third input port, a fourth input port, a fifth input port and a sixth input port, a first charging port, a second charging port, a third charging port, a fourth charging port, a first output port, a second output port and a third output port, the first voltage balancing module (10) comprises a first DC / DC module (11), the second voltage balancing module (20) comprises a second DC / DC module (21), the first charging port is connected to a first power battery (31) and is used as a charging port for the first power battery (31); the second charging port is connected to a second power battery (41) and is used as a charging port for the second power battery (41); the third charging port is connected to a third power battery (51) and is used as a charging port for the third power battery (51), and the fourth charging port is connected to a fourth power battery ( The first input port is connected to the negative terminal of the first power battery (31) and the negative terminal of the second power battery (41), the second input port is connected to the positive terminal of the first power battery (31), the third input port is connected to the positive terminal of the second power battery (41), and the fourth input port is connected to the negative terminal of the third power battery (51) and the negative terminal of the fourth power battery (61); the fifth input port is connected to the positive terminal of the third power battery (51), and the sixth input port is connected to the positive terminal of the fourth power battery (61); the first output port is connected to the first input port, the second output port is connected to the fourth input port, and the third output port is connected to the output terminal of the third energy storage module (50) and the output terminal of the fourth energy storage module (60), respectively.

3. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 2, characterized in that: The collaborative control module (70) is connected to the first DC / DC module (11) and the second DC / DC module (21) respectively, and is used to start the second DC / DC module (21) if it is detected that the difference between the voltage detection value of the output end of the third on-board energy storage supply circuit and the voltage detection value of the output end of the second on-board energy storage supply circuit is greater than a preset first voltage threshold; and to start the first DC / DC module (11) if it is identified that the voltage detection value of the output end of the second on-board energy storage supply circuit is greater than the preset first voltage threshold.

4. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 3, characterized in that: Both the first DC / DC module (11) and the second DC / DC module (21) include a DC / DC module main circuit, a DC / DC module auxiliary power supply circuit, a DC / DC module detection and protection circuit, a DC / DC module regulation circuit, and a DC / DC module PWM control circuit. The DC / DC module auxiliary power supply circuit is respectively connected to the DC / DC module main circuit, the DC / DC module detection and protection circuit, the DC / DC module regulation circuit, and the DC / DC module PWM control circuit, and is used as the working power supply for the DC / DC module main circuit, the DC / DC module detection and protection circuit, the DC / DC module regulation circuit, and the DC / DC module PWM control circuit.

5. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 4, characterized in that: The DC / DC module main circuit includes a push-pull conversion circuit, a bridge rectifier circuit, an LC filter circuit, and a current-voltage conversion circuit connected in sequence.

6. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 4, characterized in that: The DC / DC module detection and protection circuit includes a voltage detection and isolation circuit, a voltage reference generation circuit, and an overload protection signal formation circuit connected in sequence.

7. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 4, characterized in that: The DC / DC module regulation circuit includes a voltage given signal formation circuit and a PID control signal generation circuit connected in sequence.

8. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 4, characterized in that: The DC / DC module PWM control circuit includes a PWM pulse formation circuit and a pulse drive circuit connected in sequence.

9. The combined high-power and multi-voltage vehicle-mounted power control system according to claim 4, characterized in that: The cooperative control module (70) includes an auxiliary power supply circuit, a voltage detection circuit, and a control circuit connected in sequence.

10. A combined high-power and multi-voltage vehicle-mounted power control method, characterized in that: Applied to the combined high-power and multi-voltage vehicle-mounted power control system according to any one of claims 1 to 9, the combined high-power and multi-voltage vehicle-mounted power control method includes the following steps: Detect the voltage detection value UG2 at the output end of the second vehicle-mounted energy storage supply circuit and the voltage detection value UG3 at the output end of the third vehicle-mounted energy storage supply circuit; According to the voltage detection value UG2 at the output end of the second vehicle-mounted energy storage supply circuit and the voltage detection value UG3 at the output end of the third vehicle-mounted energy storage supply circuit, calculate the first voltage detection value UL and the second voltage detection value UH, where UL = UG2 and UH = UG3 - UG2; If it is recognized that UL < Umin, then turn off the first DC / DC module, where Umin is a preset first voltage threshold; If it is recognized that UH < Umin, then turn off the second DC / DC module; If it is recognized that UH - UL > ΔU, then adjust the values of K1 and K2, the first DC / DC module is connected to K1, and the second DC / DC module is connected to K2; K1 is the first adjustment value, K2 is the second adjustment value, and ΔU is a preset second voltage threshold; If it is recognized that UL - UH > ΔU, then adjust the values of K2 and K1, the first DC / DC module is connected to K2, and the second DC / DC module is connected to K1.

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