Control circuit, control method and circuit control system

Abstract

The invention provides a control circuit, a control method and a circuit control system, a main control unit controls a high-voltage power supply device to output a first direct-current voltage, the first direct-current voltage is converted by a direct-current conversion unit, a second direct-current voltage is output, and the first direct-current voltage and the second direct-current voltage are sent to three single-phase inversion units, so that the three single-phase inversion units are driven according to pre-received second driving signals respectively; processing the second direct-current voltage, outputting corresponding inversion voltage, and outputting three-phase alternating current or single-phase alternating current through a switching converter; according to the control circuit, the three independent single-phase inversion units are used for carrying out inversion processing on the second direct-current voltage, the needed three-phase alternating current or single-phase alternating current can be output by controlling the switch converter, various electricity utilization requirements are met, and in addition, the control circuit is convenient to use. The circuit can ensure that the power when a single-phase alternating current is output is the same as the power when a three-phase alternating current is output; the circuit structure formed by the three independent single-phase inversion units can ensure three-phase balance, and the output voltage precision and the fuel economy are improved.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to a control circuit, a control method and a circuit control system. Background Art

[0002] Currently, the power supply vehicles used for emergency support can only provide a single three-phase AC power. If single-phase AC power is needed, it can only provide one-third of the power of three-phase AC power, which greatly reduces the power. In addition, the three-phase imbalance of the generator of the power supply vehicle leads to a significant reduction in output voltage accuracy and fuel economy. Summary of the invention

[0003] The object of the present invention is to provide a control circuit, a control method and a circuit control system to meet various power requirements, increase the power of the output single-phase alternating current, ensure three-phase balance, and improve the output voltage accuracy and fuel economy.

[0004] The present invention provides a control circuit, which includes: a main control unit, which is used to receive a power supply startup instruction, control the connected high-voltage power supply equipment to output a first DC voltage according to the power supply startup instruction, and send the first DC voltage to a DC conversion unit; the main control unit sends a first drive signal to the DC conversion unit; the DC conversion unit is used to perform DC conversion on the first DC voltage according to the first drive signal, output a second DC voltage, and send the second DC voltage to three single-phase inverter units; the three single-phase inverter units are used to perform inversion processing on the second DC voltage according to the second drive signal received in advance, output the inverter voltages corresponding to the three single-phase inverter units respectively, and output three-phase alternating current or single-phase alternating current through a switching converter; wherein the power of the three-phase alternating current is the same as the power of the single-phase alternating current; when used to output three-phase alternating current, the phases of the second drive signals corresponding to each single-phase inverter unit are 120° different in phase; when used to output single-phase alternating current, the phases of the second drive signals corresponding to each single-phase inverter unit are the same.

[0005] Further, the switch converter includes: three sub-switches; the three sub-switches correspond to three single-phase inverter units one by one; each single-phase inverter unit includes: an H-bridge inverter circuit composed of power switches, having a first input end, a second input end, a driving end, a first output end, and a second output end; the first input end and the second input end of the H-bridge inverter circuit are used to receive a second DC voltage; the driving end of the H-bridge inverter circuit is connected to the main control unit, and is used to receive a second driving signal sent by the main control unit; the second driving signal is used to control the conduction and shutdown of the four power switches in the H-bridge inverter circuit according to the timing set by the program, and outputs the first high-frequency modulated voltage after inversion;

[0006] The filter module has a first input end, a second input end, a first output end and a second output end. The first input end of the filter module is connected to the first output end of the H-bridge inverter circuit, the second input end of the filter module is connected to the second output end of the H-bridge inverter circuit, and the first output end of the filter module is connected to the input end of the switch converter; the second output end of the filter module serves as a neutral line; the filter module is used to filter the first high-frequency modulated voltage and output an inverter voltage; wherein the first output end of the filter module in each single-phase inverter unit is respectively connected to the input end of the corresponding sub-switching switch.

[0007] Furthermore, each sub-switching switch has an input end, a control end, a first output end, and a second output end. The input end of the sub-switching switch is connected to the first output end of the filter module in the corresponding single-phase inverter unit; the second output ends of each sub-switching switch are connected to each other, and the control end of the sub-switching switch is connected to the main control unit; if a first switching instruction sent by the main control unit is received, the input end of the sub-switching switch and the first output end of the sub-switching switch are connected, and three-phase alternating current is output through the first output end of each sub-switching switch and the second output end of each filter module; if a second switching instruction sent by the main control unit is received, the input end of the sub-switching switch and the second output end of the sub-switching switch are connected, and single-phase alternating current is output through the second output ends of each sub-switching switch that are connected to each other and the second output end of each filter module.

[0008] Furthermore, the filtering module includes: a first inductor having a first end and a second end, the first end of the first inductor being connected to the first output end of the H-bridge inverter circuit; a second inductor having a first end and a second end, the first end of the second inductor being connected to the second output end of the H-bridge inverter circuit; a first capacitor having a first end and a second end, the first end of the first capacitor being respectively connected to the second end of the first inductor and the first output end of the filtering module; and the second end of the first capacitor being respectively connected to the second end of the second inductor and the second output end of the filtering module.

[0009] Further, the DC conversion unit includes: a first switch having a first end, a second end and a control end, the first end of the first switch being connected to a first voltage output end of the high-voltage power supply device, the control end of the first switch being connected to the main control unit, and being used to turn on the first switch if a first turn-on instruction sent by the main control unit is received; and to turn off the first switch if a first turn-off instruction sent by the main control unit is received;

[0010] A DC / DC module, comprising a first input terminal, a second input terminal, a driving terminal, a first output terminal and a second output terminal, wherein the first input terminal of the DC / DC module is connected to the second terminal of the first switch; the second input terminal of the DC / DC module is connected to the second voltage output terminal of the high-voltage power supply device; the driving terminal of the DC / DC module is connected to the main control unit for receiving a first driving signal; the first driving signal is used to control the on and off of four power switches in the DC / DC module according to a timing sequence set by a program, and output a second DC voltage; the second output terminal of the DC / DC module is connected to the second input terminal of each H-bridge inverter circuit; wherein the first voltage output terminal and the second voltage output terminal of the high-voltage power supply device are used to output the first DC voltage;

[0011] The second switch has an input end, a control end, a first output end, and a second output end. The input end of the second switch is connected to the first output end of the DC / DC module; the control end of the second switch is connected to the main control unit, and is used to connect the input end of the second switch and the first output end of the second switch if a third switching instruction sent by the main control unit is received; if a fourth switching instruction sent by the main control unit is received, the input end of the second switch and the second output end of the second switch are connected; the first output end of the second switch is connected to the first input end of each H-bridge inverter circuit.

[0012] Further, the circuit also includes: a third switch, having a first input end, a second input end, a first output end, a second output end and a control end; the first input end of the third switch is connected to the second output end of the second switch; the second input end of the third switch is connected to the second output end of the DC / DC module; the control end of the third switch is connected to the main control unit, and is used to connect the first input end of the third switch and the first output end of the third switch, and connect the second input end of the third switch and the second output end of the third switch if a second turn-on instruction sent by the main control unit is received; and disconnect the first input end of the third switch and the first output end of the third switch, and disconnect the second input end of the third switch and the second output end of the third switch if a second turn-off instruction sent by the main control unit is received;

[0013] A DC charging interface comprises a first input terminal, a second input terminal, a ground terminal and a signal terminal; the first input terminal of the DC charging interface is connected to the first output terminal of the third switch; the second input terminal of the DC charging interface is connected to the second output terminal of the third switch; the ground terminal of the DC charging interface is grounded; the signal terminal of the DC charging interface is connected to the main control unit for receiving a signal instruction sent by the main control unit; the DC charging interface is used to connect a device to be charged so as to charge the device to be charged.

[0014] Furthermore, the main control unit and the high voltage power supply device are connected via a CAN bus communication.

[0015] Furthermore, the high voltage power supply equipment is a range-extended electric vehicle.

[0016] A control method provided by the present invention comprises: a main control unit receives a power startup instruction, controls the connected high-voltage power supply device to output a first DC voltage according to the power startup instruction, and sends the first DC voltage to a DC conversion unit; the main control unit sends a first drive signal to the DC conversion unit; the DC conversion unit performs DC conversion on the first DC voltage according to the first drive signal, outputs a second DC voltage, and sends the second DC voltage to three single-phase inverter units; the three single-phase inverter units respectively invert the second DC voltage according to the second drive signal received in advance, output the inverter voltages respectively corresponding to the three single-phase inverter units, and output three-phase AC power or single-phase AC power through a switch converter;

[0017] Among them, the power of three-phase alternating current is the same as the power of single-phase alternating current; when used to output three-phase alternating current, the phases of the second drive signals corresponding to each single-phase inverter unit differ by 120° respectively; when used to output single-phase alternating current, the phases of the second drive signals corresponding to each single-phase inverter unit are the same.

[0018] A circuit control system provided by the present invention comprises: a high voltage power supply device and a control circuit according to any one of claims 1 to 9.

[0019] The control circuit, control method and circuit control system provided by the present invention include a main control unit for receiving a power supply startup instruction, controlling the connected high-voltage power supply device to output a first DC voltage according to the power supply startup instruction, and sending the first DC voltage to a DC conversion unit; the main control unit sends a first drive signal to the DC conversion unit; the DC conversion unit is used to perform DC conversion on the first DC voltage according to the first drive signal, output a second DC voltage, and send the second DC voltage to three single-phase inverter units; the three single-phase inverter units are used to perform inversion processing on the second DC voltage according to the pre-received second drive signal, output the inverter voltages respectively corresponding to the three single-phase inverter units, and output three-phase AC power or single-phase AC power through a switch converter; the control circuit performs inversion processing on the second DC voltage by three independent single-phase inverter units respectively, and can output the required three-phase AC power or single-phase AC power by controlling the switch converter to meet various power requirements, and the circuit can ensure that the power when outputting single-phase AC power is the same as the power when outputting three-phase AC power; the circuit structure composed of three independent single-phase inverter units can ensure three-phase balance, improve the output voltage accuracy and fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a control circuit provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of another control circuit provided by an embodiment of the present invention;

[0023] Figure 3 A flow chart of a control method provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a circuit control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] At present, the power supply vehicle used for emergency support can only provide a single three-phase AC power. For example, a 45kW power supply vehicle can only output three-phase four-wire AC power. If the load end requires a single-phase power supply, the power supply vehicle can only provide a 15kW single-phase power supply. In addition, the three-phase generator of the power supply vehicle is seriously unbalanced, resulting in a significant reduction in output voltage accuracy and fuel economy. Based on this, the embodiment of the present invention provides a control circuit, a control method and a circuit control system, which can be applied to scenarios that need to meet multiple power requirements.

[0027] To facilitate understanding of this embodiment, a control circuit disclosed in an embodiment of the present invention is first introduced. Figure 1 As shown, where the dotted line represents a signal connection and the solid line represents a power connection, the control circuit 41 includes: a main control unit 10, a DC conversion unit 11, three single-phase inverter units and a switch converter SW3; the main control unit 10 is used to receive a power startup instruction, control the connected high-voltage power supply device to output a first DC voltage according to the power startup instruction, and send the first DC voltage to the DC conversion unit 11; the main control unit 10 sends a first drive signal to the DC conversion unit 11;

[0028] The main function of the main control unit 10 is to control the coordinated work of various components. It is mainly composed of an intelligent chip, an acquisition circuit, a drive circuit, a human-machine interface (touch display screen), a communication, a control interface, a power conversion, etc. The above-mentioned power startup instruction can be used to instruct the high-voltage power supply device to send a first DC voltage; the high-voltage power supply device can be used as a power supply to power other electrical devices. In actual implementation, the user can operate the touch screen or operation button connected to the main control unit 10 to send a power startup instruction to the main control unit 10; the power requirements corresponding to different electrical devices may be the same or different, and the power startup instructions corresponding to different power requirements are usually different. The user can issue a corresponding power startup instruction according to the specific power requirements. For example, if the electrical device requires three-phase alternating current, the power startup instruction usually carries relevant information about the three-phase alternating current, such as the voltage, current, power, etc. of the three-phase alternating current; if single-phase alternating current is required, the power startup instruction usually carries relevant information about the single-phase alternating current, such as the voltage, current, power, etc. of the single-phase alternating current.

[0029] In actual implementation, after receiving the power start-up instruction, the main control unit 10 can send a high-voltage output start-up request to the high-voltage power supply device. After receiving the high-voltage output start-up request, the high-voltage power supply device can start the power supply and output a first DC voltage. In order to adapt to the voltage requirements of different devices, it is usually necessary to first send the first DC voltage to the DC conversion unit 11. In the control circuit, the DC conversion unit 11 usually includes a power switch, such as an IGBT, a MOSFET, etc. Therefore, the main control unit 10 will also send a first drive signal to the DC conversion unit 11, which is used to control the conduction or shutdown of the four power switches in the DC conversion unit 11 according to the timing set by the program.

[0030] The DC conversion unit 11 is used to perform DC conversion on the first DC voltage according to the first driving signal, output a second DC voltage, and send the second DC voltage to the three single-phase inverter units;

[0031] The above-mentioned second DC voltage is usually different from the first DC voltage. In actual implementation, after the DC conversion unit 11 receives the first drive signal, it can perform DC conversion on it to obtain a converted second DC voltage. The second DC voltage can be sent to three independent single-phase inverter units respectively as the power supply voltage of each single-phase inverter unit.

[0032] The three single-phase inverter units are used to invert the second DC voltage according to the second drive signal received in advance, output the inverter voltages corresponding to the three single-phase inverter units respectively, and output three-phase AC power or single-phase AC power through the switching converter SW3; wherein the power of the three-phase AC power is the same as the power of the single-phase AC power; when used to output three-phase AC power, the phases of the second drive signals corresponding to each single-phase inverter unit are 120° apart in sequence; when used to output single-phase AC power, the phases of the second drive signals corresponding to each single-phase inverter unit are the same.

[0033] The above-mentioned single-phase inverter unit usually includes a power switch, such as IGBT, MOSFET, etc. Therefore, it is necessary to provide a second drive signal for each single-phase inverter unit, which is used to control the conduction or shutdown of the four power switches in each single-phase inverter unit according to the timing set by the program to achieve the inverter processing; in this embodiment, when the power demand is different, the second drive signal driving each single-phase inverter unit is usually different. Specifically, when it is necessary to output three-phase alternating current, it is necessary to control the phase of the second drive signal corresponding to each single-phase inverter unit to differ by 120° in sequence, so that the phase of the inverter voltage output by each single-phase inverter unit differs by 120° in sequence. When it is necessary to output single-phase alternating current, it is necessary to control the phase of the second drive signal corresponding to each single-phase inverter unit to be the same, that is, the same second drive signal can be used to drive each single-phase inverter unit, so that the phase of the inverter voltage output by each single-phase inverter unit is the same.

[0034] The main control unit 10 can switch the switch converter SW3 according to different power requirements to output three-phase AC power or single-phase AC power that meets the power requirements. In this embodiment, by using three independent single-phase inverter units and the switch converter SW3 in combination, the power when the single-phase AC power is output can be the same as the power when the three-phase AC power is output, and the power when the single-phase AC power is output will not be only one-third of the power when the three-phase AC power is output, thus solving the problem of power reduction.

[0035] The control circuit is composed of three independent single-phase inverter units that perform inversion processing on the second DC voltage respectively. By controlling the switch converter SW3, the required three-phase AC power or single-phase AC power can be output to meet various power needs. In addition, the circuit can ensure that the power when outputting single-phase AC power is the same as the power when outputting three-phase AC power. This circuit structure composed of three independent single-phase inverter units can ensure three-phase balance and improve the output voltage accuracy and fuel economy.

[0036] Further, such as Figure 2The schematic diagram of another control circuit shown in FIG. 1 shows that the switch converter SW3 includes: three sub-switches; the three sub-switches correspond to three single-phase inverter units one by one; the three sub-switches can be implemented by single-pole double-throw switches; each single-phase inverter unit includes:

[0037] An H-bridge inverter circuit composed of power switches has a first input terminal, a second input terminal, a driving terminal, a first output terminal and a second output terminal; the power switch may be an IGBT, a MOSFET, etc. The first input terminal and the second input terminal of the H-bridge inverter circuit are used to receive a second DC voltage; that is, the second DC voltage output by the DC conversion unit 11 can be used as the power supply voltage of each H-bridge inverter circuit respectively. The driving terminal of the H-bridge inverter circuit is connected to the main control unit 10, and is used to receive a second driving signal sent by the main control unit 10; the second driving signal is used to control the conduction and shutdown of the four power switches in the H-bridge inverter circuit according to the timing set by the program, and outputs the first high-frequency modulated voltage after inversion; the main control unit 10 can send the corresponding second driving signal to the driving terminal of each H-bridge inverter circuit according to the power demand, and each H-bridge inverter circuit performs inversion processing to output the first high-frequency modulated voltage after inversion. Figure 2 In the embodiment, the H-bridge inverter circuit Q1 in the first single-phase inverter unit, the H-bridge inverter circuit Q2 in the second single-phase inverter unit and the H-bridge inverter circuit Q3 in the third single-phase inverter unit.

[0038] The filter module has a first input end, a second input end, a first output end and a second output end. The first input end of the filter module is connected to the first output end of the H-bridge inverter circuit, the second input end of the filter module is connected to the second output end of the H-bridge inverter circuit, and the first output end of the filter module is connected to the input end of the switch converter SW3; the second output end of the filter module serves as a neutral line; the second output ends of the three filter modules in the three single-phase inverter units can be connected to each other and led out as a neutral line; the filter module is used to filter the first high-frequency modulated voltage and output an inverter voltage.

[0039] In this embodiment, the filter module is usually a low-pass filter, and the first high-frequency modulation voltage output by each H-bridge inverter circuit is usually a high-frequency PWM voltage. The filter module can extract a sinusoidal wave voltage from the high-frequency PWM voltage as an inverter voltage; wherein the first output end of the filter module in each single-phase inverter unit is respectively connected to the input end of the corresponding sub-switching switch; that is, the first output end of the filter module LF1 in the first single-phase inverter unit is connected to the input end (contact 1-2) of the first sub-switching switch; the first output end of the filter module LF2 in the second single-phase inverter unit is connected to the input end (contact 2-2) of the second sub-switching switch; the first output end of the filter module LF3 in the third single-phase inverter unit is connected to the input end (contact 3-2) of the third sub-switching switch.

[0040] Furthermore, each sub-switching switch has an input end, a control end, a first output end, and a second output end. The input end of the sub-switching switch is connected to the first output end of the filter module in the corresponding single-phase inverter unit; the second output ends of each sub-switching switch are connected to each other, that is, the second output ends of the three sub-switching switches are connected together, that is, the contact 1-1 of the first sub-switching switch, the contact 2-1 of the second sub-switching switch and the contact 3-1 of the third sub-switching switch are connected to each other, as one of the output ends L when the power demand is single-phase AC power; the control end of the sub-switching switch is connected to the main control unit 10; it is used to connect the input end of the sub-switching switch and the first output end of the sub-switching switch if a first switching instruction sent by the main control unit 10 is received, and output three-phase AC power through the first output end of each sub-switching switch and the second output end of each filter module; when When the power demand is three-phase alternating current, the main control unit 10 can send a first switching instruction to each sub-switching switch, so that each sub-switching switch is switched to be connected to its corresponding first output terminal, and one phase of the three-phase alternating current can be output through the first output terminal of each sub-switching switch, such as the first output terminal (contact 1-3) of the first sub-switching switch outputs A-phase voltage La, the first output terminal (contact 2-3) of the second sub-switching switch outputs B-phase voltage Lb, and the first output terminal (contact 3-3) of the third sub-switching switch outputs C-phase voltage Lc. The second output terminal of each filtering module serves as a neutral line, that is, the three-phase alternating current outputted in this embodiment is specifically three-phase four-wire alternating current. By setting the neutral line, it can be achieved that there is no current in the neutral line when the three phases are balanced, so that the three-phase four-wire alternating current has significant advantages in power distribution, flexibility of use and safety.

[0041] If the second switching instruction sent by the main control unit 10 is received, the input end of the sub-switch and the second output end of the sub-switch are turned on, and single-phase AC power is output through the second output ends of each sub-switch connected to each other and the second output end of each filter module. When the power demand is single-phase AC power, the main control unit 10 can send a second switching instruction to each sub-switch, so that each sub-switch is switched to connect to the corresponding second output end. Since the second output ends of each sub-switch are connected to each other, single-phase AC power can be output through the second output ends connected to each other and the second output end of each filter module; that is, in this embodiment, the switch converter SW3 is a three-phase / single-phase output conversion switch.

[0042] Further, the filter module includes: a first inductor L1, a second inductor L2 and a first capacitor C1; the first inductor L1 has a first end and a second end, and the first end of the first inductor L1 is connected to the first output end of the H-bridge inverter circuit; the inductance value of the first inductor L1 can be set according to actual needs; the second inductor L2 has a first end and a second end, and the first end of the second inductor L2 is connected to the second output end of the H-bridge inverter circuit; the inductance value of the second inductor L2 can be set according to actual needs; the inductance value of the second inductor L2 can be the same as or different from the inductance value of the first inductor L1. The first capacitor C1 has a first end and a second end, and the first end of the first capacitor C1 is respectively connected to the second end of the first inductor L1 and the first output end of the filter module; the second end of the first capacitor C1 is respectively connected to the second end of the second inductor L2 and the second output end of the filter module. The capacitance value of the first capacitor C1 can be set according to actual needs. Preferably, to ensure control accuracy, the inductance value of each first inductor L1 in each filter module is usually the same, the inductance value of each second inductor L2 is usually the same, and the capacitance value of each first capacitor C1 is usually the same.

[0043] Further, the DC conversion unit 11 includes: a first switch SW1, a DC / DC module and a second switch SW2;

[0044] The first switch SW1 has a first end, a second end and a control end. The first end of the first switch SW1 is connected to the first voltage output end DC1+ of the high-voltage power supply device. The control end of the first switch SW1 is connected to the main control unit 10, and is used to turn on the first switch SW1 if a first turn-on instruction sent by the main control unit 10 is received; if a first turn-off instruction sent by the main control unit 10 is received, the first switch SW1 is turned off; in actual implementation, the first switch SW1 can be used as the main power switch of the control circuit, and its main function is to cut off or connect the first DC voltage provided by the high-voltage power supply device. When the main control module determines that the other switches in the control circuit are connected to the corresponding positions, the first turn-on instruction can be sent to the control end of the first switch SW1, and the first switch SW1 can be closed after receiving the first turn-on instruction. When the power is used up, the main control unit 10 can send a first turn-off instruction to the control end of the first switch SW1, and the first switch SW1 can be turned off after receiving the first turn-off instruction.

[0045] A DC / DC module has a first input terminal, a second input terminal, a driving terminal, a first output terminal and a second output terminal. The first input terminal of the DC / DC module is connected to the second terminal of the first switch SW1; the second input terminal of the DC / DC module is connected to the second voltage output terminal DC1- of the high-voltage power supply device; the driving terminal of the DC / DC module is connected to the main control unit 10 for receiving a first driving signal; the first driving signal is used to control the on and off of four power switches in the DC / DC module according to the timing set by the program, and output a second DC voltage; the power switch can be an IGBT, a MOSFET, etc.; the second output terminal of the DC / DC module is connected to the second input terminal of each H-bridge inverter circuit; wherein the first voltage output terminal DC1+ and the second voltage output terminal DC1- of the high-voltage power supply device are used to output the first DC voltage;

[0046] In this embodiment, the circuit design of the DC / DC module can be flexibly designed as needed, as long as the DC conversion function can be realized and the converted second DC voltage meets the application requirements; in one embodiment, the DC / DC module may include an H-bridge inverter circuit Q4, a filter isolation circuit and a rectifier circuit, wherein the power switch in the H-bridge inverter circuit Q4 may be implemented by IGBT, MOSFET, etc., the output end of the H-bridge inverter circuit Q4 is connected to the input end of the filter isolation circuit, and the filter isolation circuit may be composed of a second capacitor Cr, a third inductor Lr, a fourth inductor Lm and an isolation transformer T1; the output end of the filter isolation circuit is connected to the input end of the rectifier circuit, and the rectifier circuit may include a single-phase rectifier circuit composed of four diodes D1, D2, D3, and D4, the output end of the rectifier circuit is connected to the third capacitor Cm, etc., and the second DC voltage can be output through the rectifier circuit.

[0047] The second switch SW2 has an input end, a control end, a first output end, and a second output end. The input end of the second switch SW2 is connected to the first output end of the DC / DC module; the control end of the second switch SW2 is connected to the main control unit 10, and is used to connect the input end of the second switch SW2 and the first output end of the second switch SW2 if the third switching instruction sent by the main control unit 10 is received; when the power demand is three-phase AC or single-phase AC, the main control unit 10 can send a third switching instruction to the second switch SW2, so that the second switch SW2 is switched to the first output end of the second switch SW2 (i.e., the contact 2-3 is connected); if the fourth switching instruction sent by the main control unit 10 is received, the input end of the second switch SW2 and the second output end of the second switch SW2 are connected (i.e., the contact 2-1 is connected); the first output end of the second switch SW2 is connected to the first input end of each H-bridge inverter circuit. When the power demand is to realize the charging pile function, the main control unit 10 can send a fourth switching instruction to the second switch SW2, so that the second switch SW2 is switched to the second output end of the second switch SW2. That is, in this embodiment, the second switch SW2 is a charging / inverting conversion switch.

[0048] Further, the circuit also includes: a third switch SW4 and a DC charging interface;

[0049] The third switch SW4 has a first input terminal, a second input terminal, a first output terminal, a second output terminal and a control terminal; the first input terminal of the third switch SW4 is connected to the second output terminal of the second switch SW2; the second input terminal of the third switch SW4 is connected to the second output terminal of the DC / DC module; the control terminal of the third switch SW4 is connected to the main control unit 10, and is used for connecting the first input terminal of the third switch SW4 and the first output terminal of the third switch SW4, and connecting the second input terminal of the third switch SW4 and the second output terminal of the third switch SW4 if a second turn-on instruction sent by the main control unit 10 is received; in actual implementation, when the power demand is to realize the charging pile function, the main control module can send a second turn-on instruction to the third switch SW4, and after the third switch SW4 receives the second turn-on instruction, the first input terminal and the first output terminal of the third switch SW4 are connected, and the second input terminal and the second output terminal of the third switch SW4 are connected; at this time, the charging pile function works.

[0050] If the second disconnection instruction sent by the main control unit 10 is received, the first input end of the third switch SW4 and the first output end of the third switch SW4 are disconnected, and the second input end of the third switch SW4 and the second output end of the third switch SW4 are disconnected; when the charging pile function is not needed, the main control module can send a second disconnection instruction to the third switch SW4, and after the third switch SW4 receives the second disconnection instruction, the first input end and the first output end of the third switch SW4 are disconnected, and the second input end and the second output end of the third switch SW4 are disconnected, that is, the charging pile function does not work. That is, the third switch SW4 acts as a DC charging switch, which can connect or disconnect the DC charging source.

[0051] The DC charging interface has a first input terminal DC+, a second input terminal DC-, a ground terminal GND and a signal terminal; the first input terminal DC+ of the DC charging interface is connected to the first output terminal of the third switch SW4; the second input terminal DC- of the DC charging interface is connected to the second output terminal of the third switch SW4; the ground terminal GND of the DC charging interface is grounded; the signal terminal of the DC charging interface is connected to the main control unit 10, and is used to receive the signal instruction sent by the main control unit 10; the above-mentioned signal terminal may include: A+, A- are low-voltage power supply interfaces, providing auxiliary power for communication; S+, S- are CAN communication interfaces (S+ corresponds to CANH, S- corresponds to CANL), which are used for charging communication between the charging pile and the vehicle battery end BMS; CC1, CC2 are charging gun combination signals (CC1 for charging piles, CC2 for batteries); the DC charging interface is used to connect the device to be charged to charge the device to be charged. The device to be charged may include electric vehicles, etc. The DC charging interface usually refers to the automotive DC charging interface, which is a standard interface that meets national standards and can provide charging for electric vehicles, including a power supply interface, a detection interface, a communication protocol interface, etc.

[0052] Furthermore, the main control unit 10 is connected to the high voltage power supply device via a CAN (Controller Area Network) bus.

[0053] The CAN bus is a serial communication protocol bus for real-time applications. It can use twisted pair cables to transmit signals and is one of the most widely used field buses. The CAN protocol is used for communication between various components in the car, replacing expensive and bulky distribution harnesses.

[0054] Furthermore, the high-voltage power supply device is an extended-range electric vehicle. An extended-range electric vehicle is a plug-in series hybrid vehicle that is driven by pure electric power, and its power system consists of a power battery system, a power drive system, a range extender, and a vehicle control system.

[0055] like Figure 2As shown, the control circuit integrates the inverter structure block diagram of three-phase, single-phase power supply and charging pile function. The high-voltage first DC voltage of the current range-extended electric vehicle (REEV) can be used as a power source. With this control, it can output three-phase four-wire 380V / 400V / 50Hz40kW AC power, single-phase 220V / 230V / 50Hz 40kW AC power, and can also provide charging pile functions that meet national standards. It can provide emergency charging services for new energy vehicles (three functions, one of three, that is, only one function can be provided at the same time). The control circuit is combined with the current range-extended electric vehicle and can be legally converted into a multi-functional power supply vehicle. The control circuit is small in size and light in weight. When it is converted into a power supply vehicle, the amount of modification to the original vehicle is very small, and it has a high cost-effectiveness.

[0056] Figure 2 The main function of the DC / DC module is to convert the high-voltage first DC voltage output by the extended-range electric vehicle into the required second DC voltage. Figure 2 The working process of the control circuit is described as follows:

[0057] 1. Three-phase four-wire AC output

[0058] The user starts the three-phase power supply by operating the touch screen of the main control unit 10. The main control unit 10 requests the extended-range electric vehicle to start the high-voltage output through the CAN. After the main control unit 10 detects that the high-voltage power supply is normal, the first sub-switch in the control switch converter SW3 is connected to the 1-2 and 1-3 contacts, the second sub-switch is connected to the 2-2 and 2-3 contacts, and the third sub-switch is connected to the 3-2 and 3-3 contacts; the second switch SW2 is controlled to connect the 2-3 contacts, and finally the first switch SW1 is connected, the DC / DC module obtains the first DC high voltage, and then the main control unit 10 sends the first drive to the DC / DC module. Signal, to start the DC / DC module to output the second DC voltage that meets the power demand, the main control unit 10 controls the H-bridge inverter circuit Q1 in the first single-phase inverter unit, the H-bridge inverter circuit Q2 in the second single-phase inverter unit, and the H-bridge inverter circuit Q3 in the third single-phase inverter unit to start the inverter to generate a high-frequency PWM voltage wave (corresponding to the above-mentioned first high-frequency modulation voltage), which passes through the first low-pass filter module LF1, the second low-pass filter module LF2 and the third low-pass filter module LF3 respectively, and obtains three sinusoidal AC voltage outputs with a phase difference of 120° (La, Lb, Lc, N-terminal output three-phase four-wire AC). At this time, there is no output at the single-phase output end, and the charging pile does not work.

[0059] 2. Single-phase AC output

[0060] The user starts the single-phase power supply by operating the touch screen of the main control unit 10. The main control unit 10 requests the extended-range electric vehicle to start the high-voltage output through the CAN. After the main control unit 10 detects that the high-voltage power supply is normal, the first sub-switch in the control switch converter SW3 is connected to the 1-2 and 1-1 contacts, the second sub-switch is connected to the 2-2 and 2-1 contacts, the third sub-switch is connected to the 3-2 and 3-1 contacts, the second switch SW2 is controlled to connect the 2-3 contacts, and finally the first switch SW1 is connected. The DC / DC module obtains the first DC high voltage, and then the main control unit 10 sends a first drive signal to the DC / DC module to start the DC / DC module to output a second DC voltage that meets the power demand. The main control unit 10 controls the first single-phase inverter unit Q1, the second single-phase inverter unit Q2, and the third single-phase inverter unit Q3 to start the inverter to generate a high-frequency PWM voltage wave (corresponding to the above-mentioned first high-frequency modulation voltage), which passes through the first low-pass filter module LF1, the second low-pass filter module LF2, and the third low-pass filter module LF3 respectively to obtain three sinusoidal AC voltage outputs with the same phase and voltage amplitude (L, N terminals output single-phase AC). At this time, there is no output at the three-phase output terminal, and the charging pile does not work.

[0061] 3. Charging pile function

[0062] The user starts the charging pile by operating the touch screen of the main control unit 10. The main control unit 10 requests the extended-range electric vehicle to start the high-voltage output through CAN. After the main control unit 10 detects that the high-voltage power supply is normal, it controls the switch converter SW3, each sub-switch is empty, controls the second switch SW2 to connect the 2-1 contact, and finally connects the first switch SW1. The DC / DC module obtains the first DC high voltage, and then the main control unit 10 starts the DC / DC module to send the first drive signal to start the DC / DC module to output the second DC voltage that meets the standard requirements of the charging pile. The main control unit 10 establishes communication with the device to be charged through CAN, and controls the third switch SW4 to be turned on after agreeing on the charging voltage and current curve to complete the charging function. At this time, there is no output at the three-phase output end.

[0063] The present invention provides a control method, such as Figure 3 As shown, the method includes:

[0064] Step S302: the main control unit receives a power startup instruction, controls the connected high-voltage power supply device to output a first DC voltage according to the power startup instruction, and sends the first DC voltage to the DC conversion unit; the main control unit sends a first drive signal to the DC conversion unit;

[0065] Step S304, the DC conversion unit performs DC conversion on the first DC voltage according to the first driving signal, outputs a second DC voltage, and sends the second DC voltage to three single-phase inverter units;

[0066] Step S306, the three single-phase inverter units respectively invert the second DC voltage according to the second drive signal received in advance, output the inverter voltages corresponding to the three single-phase inverter units respectively, and output three-phase AC power or single-phase AC power through the switching converter; wherein the power of the three-phase AC power is the same as the power of the single-phase AC power; when used to output three-phase AC power, the phases of the second drive signals corresponding to each single-phase inverter unit are 120° apart in sequence; when used to output single-phase AC power, the phases of the second drive signals corresponding to each single-phase inverter unit are the same.

[0067] In the above control method, three independent single-phase inverter units are used to invert the second DC voltage respectively. By controlling the switch converter, the required three-phase AC power or single-phase AC power can be output to meet various power needs. In addition, the circuit can ensure that the power when outputting single-phase AC power is the same as the power when outputting three-phase AC power. This circuit structure composed of three independent single-phase inverter units can ensure three-phase balance and improve the output voltage accuracy and fuel economy.

[0068] The present invention provides a circuit control system, such as Figure 4 As shown, it includes: a high-voltage power supply device 40 and a control circuit 41 of any of the above items.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control circuit, characterized in that: The circuit comprises: A main control unit, configured to receive a power startup instruction, control the connected high-voltage power supply device to output a first DC voltage according to the power startup instruction, and send the first DC voltage to a DC conversion unit; the main control unit sends a first drive signal to the DC conversion unit; The DC conversion unit is used to perform DC conversion on the first DC voltage according to the first driving signal, output a second DC voltage, and send the second DC voltage to three single-phase inverter units; The three single-phase inverter units are used to invert the second DC voltage according to the second driving signal received in advance, output the inverter voltages corresponding to the three single-phase inverter units, and output three-phase AC power or single-phase AC power through the switching converter; Among them, the power of the three-phase alternating current is the same as the power of the single-phase alternating current; when used to output the three-phase alternating current, the phases of the second drive signals corresponding to each of the single-phase inverter units differ by 120° respectively; when used to output the single-phase alternating current, the phases of the second drive signals corresponding to each of the single-phase inverter units are the same.

2. The circuit according to claim 1, characterized in that The switch converter comprises: three sub-switches; the three sub-switches correspond to three single-phase inverter units one by one; each single-phase inverter unit comprises: An H-bridge inverter circuit composed of power switches has a first input terminal, a second input terminal, a driving terminal, a first output terminal, and a second output terminal; the first input terminal and the second input terminal of the H-bridge inverter circuit are used to receive the second DC voltage; the driving terminal of the H-bridge inverter circuit is connected to the main control unit, and is used to receive the second driving signal sent by the main control unit; the second driving signal is used to control the conduction and shutdown of four power switches in the H-bridge inverter circuit according to the timing set by the program, and outputs the inverted first high-frequency modulated voltage; A filter module has a first input end, a second input end, a first output end and a second output end. The first input end of the filter module is connected to the first output end of the H-bridge inverter circuit, the second input end of the filter module is connected to the second output end of the H-bridge inverter circuit, and the first output end of the filter module is connected to the input end of the switch converter; the second output end of the filter module serves as a neutral line; the filter module is used to filter the first high-frequency modulation voltage and output an inverter voltage; wherein the first output end of the filter module in each single-phase inverter unit is respectively connected to the input end of the corresponding sub-switching switch.

3. The circuit according to claim 1, characterized in that Each sub-switch has an input end, a control end, a first output end, and a second output end. The input end of the sub-switch is connected to the first output end of the filter module in the corresponding single-phase inverter unit; the second output ends of each sub-switch are connected to each other, and the control end of the sub-switch is connected to the main control unit; if a first switching instruction sent by the main control unit is received, the input end of the sub-switch and the first output end of the sub-switch are connected, and three-phase AC power is output through the first output end of each sub-switch and the second output end of each filter module; If a second switching instruction sent by the main control unit is received, the input end of the sub-switching switch and the second output end of the sub-switching switch are connected, and single-phase AC power is output through the second output end of each sub-switching switch connected to each other and the second output end of each filtering module.

4. The circuit according to claim 2, characterized in that The filtering module comprises: A first inductor having a first end and a second end, wherein the first end of the first inductor is connected to the first output end of the H-bridge inverter circuit; A second inductor having a first end and a second end, wherein the first end of the second inductor is connected to the second output end of the H-bridge inverter circuit; The first capacitor has a first end and a second end, wherein the first end of the first capacitor is respectively connected to the second end of the first inductor and the first output end of the filter module; the second end of the first capacitor is respectively connected to the second end of the second inductor and the second output end of the filter module.

5. The circuit according to claim 2, characterized in that The DC conversion unit comprises: A first switch, having a first end, a second end and a control end, wherein the first end of the first switch is connected to the first voltage output end of the high-voltage power supply device, and the control end of the first switch is connected to the main control unit, and is used to turn on the first switch if a first turn-on instruction sent by the main control unit is received; and to turn off the first switch if a first turn-off instruction sent by the main control unit is received; A DC / DC module, having a first input terminal, a second input terminal, a driving terminal, a first output terminal and a second output terminal, wherein the first input terminal of the DC / DC module is connected to the second terminal of the first switch; the second input terminal of the DC / DC module is connected to the second voltage output terminal of the high-voltage power supply device; the driving terminal of the DC / DC module is connected to the main control unit for receiving the first driving signal; the first driving signal is used to control the on and off of the four power switches in the DC / DC module according to the timing set by the program, and output the second DC voltage; the second output terminal of the DC / DC module is connected to the second input terminal of each of the H-bridge inverter circuits; wherein the first voltage output terminal and the second voltage output terminal of the high-voltage power supply device are used to output the first DC voltage; The second switch has an input end, a control end, a first output end and a second output end, wherein the input end of the second switch is connected to the first output end of the DC / DC module; the control end of the second switch is connected to the main control unit, and is used for connecting the input end of the second switch and the first output end of the second switch if a third switching instruction sent by the main control unit is received; and connecting the input end of the second switch and the second output end of the second switch if a fourth switching instruction sent by the main control unit is received; the first output end of the second switch is connected to the first input end of each of the H-bridge inverter circuits.

6. The circuit according to claim 5, characterized in that The circuit further comprises: A third switch has a first input end, a second input end, a first output end, a second output end and a control end; the first input end of the third switch is connected to the second output end of the second switch; the second input end of the third switch is connected to the second output end of the DC / DC module; the control end of the third switch is connected to the main control unit, and is used for connecting the first input end of the third switch and the first output end of the third switch, and connecting the second input end of the third switch and the second output end of the third switch if a second turn-on instruction sent by the main control unit is received; and disconnecting the first input end of the third switch and the first output end of the third switch, and disconnecting the second input end of the third switch and the second output end of the third switch if a second turn-off instruction sent by the main control unit is received; A DC charging interface, comprising a first input terminal, a second input terminal, a ground terminal and a signal terminal; the first input terminal of the DC charging interface is connected to the first output terminal of the third switch; the second input terminal of the DC charging interface is connected to the second output terminal of the third switch; the ground terminal of the DC charging interface is grounded; the signal terminal of the DC charging interface is connected to the main control unit for receiving a signal instruction sent by the main control unit; the DC charging interface is used to connect a device to be charged so as to charge the device to be charged.

7. The circuit according to claim 1, characterized in that The main control unit is connected to the high-voltage power supply device via a CAN bus communication.

8. The circuit according to claim 1, characterized in that The high-voltage power supply equipment is an extended-range electric vehicle.

9. A control method, characterized in that: The method comprises: The main control unit receives a power startup instruction, controls the connected high-voltage power supply device to output a first DC voltage according to the power startup instruction, and sends the first DC voltage to the DC conversion unit; the main control unit sends a first drive signal to the DC conversion unit; The DC conversion unit performs DC conversion on the first DC voltage according to the first driving signal, outputs a second DC voltage, and sends the second DC voltage to three single-phase inverter units; The three single-phase inverter units respectively invert the second DC voltage according to the second driving signal received in advance, output the inverter voltages corresponding to the three single-phase inverter units respectively, and output three-phase AC power or single-phase AC power through the switch converter; Among them, the power of the three-phase alternating current is the same as the power of the single-phase alternating current; when used to output the three-phase alternating current, the phases of the second drive signals corresponding to each of the single-phase inverter units differ by 120° respectively; when used to output the single-phase alternating current, the phases of the second drive signals corresponding to each of the single-phase inverter units are the same.

10. A circuit control system, characterized in that: include: A high voltage power supply device and a control circuit as claimed in any one of claims 1 to 8.

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