Circuit for reducing standby power consumption of charging pile module

Abstract

The utility model belongs to the technical field of circuits, and discloses a circuit for reducing standby power consumption of a charging pile module, which comprises five power relays, two auxiliary source circuits, two EMC (Electro Magnetic Compatibility) filters, a three-phase rectifying circuit, a three-phase PFC (Power Factor Correction) rectifying circuit, a DCDC (Direct Current-Direct Current) conversion circuit and the like. A three-phase EMC filter circuit (EMC filter 1), a PFC / DCDC conversion circuit and an auxiliary source of the charging pile module stop working and are separated from a three-phase power grid, three-phase alternating current passes through a small EMC filter 2 and a three-phase rectification circuit and then is supplied to a standby auxiliary source for working, and output of the standby auxiliary source is supplied to an MCU of the PFC, an MCU of the DCDC converter and a communication circuit for working. The beneficial effects of the utility model are that the standby power consumption and the reactive power loss of the charging pile module can be reduced in the process, thereby satisfying the goals of energy saving and operation cost reduction.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a circuit for reducing the standby power consumption of a charging pile module. Background Art

[0002] In the field of high-power AC-DC charging piles, in order to effectively reduce the standby power consumption and reactive power loss of the charging piles after a large number of charging piles are deployed, a circuit for reducing the standby power consumption of the charging pile module is required. In current traditional charging pile devices, the charging pile module generally uses an auxiliary power supply to complete functions such as PFC / DCDC signal control and sampling. Moreover, this auxiliary power supply still needs to provide relatively large power consumption to supply the PFC / DCDC voltage, current and other signal sampling circuits during standby. In current traditional new energy charging piles, the standby power consumption of the charging module is between 8W and 15W. Under the background of the country's promotion of the construction of charging piles, in the future, many charging piles will still consume a large amount of electric energy in the standby mode. And the input EMC filter 1 on the main power loop of the traditional charging pile is directly connected to the power grid, and it contains a relatively large-capacity safety capacitor. At this time, the capacitor in the EMC filter also generates a relatively large reactive power loss during the standby mode, which is not conducive to energy conservation and emission reduction and is a relatively large loss for the charging pile operation enterprise.

[0003] Therefore, it is necessary to provide a circuit for reducing the standby power consumption of the charging pile module, which can reduce the standby power consumption and standby reactive power loss of the charging pile module to meet the requirements of energy conservation and reduction of operation costs. Summary of the Utility Model

[0004] The utility model discloses a circuit for reducing the standby power consumption of a charging pile module, which can effectively solve the technical problems involved in the background art.

[0005] To achieve the above object, the technical solution of the utility model is as follows:

[0006] A circuit for reducing the standby power consumption of a charging pile module includes a U-line port, a V-line port and a W-line port. The U-line port is connected to one end of a relay K1, the V-line port is connected to one end of a relay K2, and the W-line port is connected to one end of a relay K3. The other ends of the relay K1, the relay K2 and the relay K3 are connected to the input end of an EMC filter 1. The output end of the EMC filter 1 is connected to the input end of a three-phase PFC rectification circuit. The output end of the three-phase PFC rectification circuit is connected to the input end of a DC / DC conversion circuit and the input end of an auxiliary power supply circuit. The output end of the auxiliary power supply circuit is connected to the controllers of the three-phase PFC rectification circuit and the DC / DC conversion circuit;

[0007] The U-line port is connected to pin 1 of the common-mode inductor L6, the V-line port is connected to pin 3 of the common-mode inductor L6, the W-line port is connected to pin 5 of the common-mode inductor L6, pin 2 of the common-mode inductor L6 is connected to the positive end of diode D5 and the negative end of diode D8, pin 4 of the common-mode inductor L6 is connected to the positive end of diode D6 and the negative end of diode D9, pin 6 of the common-mode inductor L6 is connected to the positive end of diode D7 and the negative end of diode D10, the negative end of diode D5 is connected to the negative ends of diode D6 and diode D7, and the positive end of diode D8 is connected to the positive ends of diode D9 and diode D10;

[0008] The negative end of diode D7 is connected to pin 1 of transformer T2, pin 2 of transformer T2 is connected to the drain of MOS transistor Q11, the source of MOS transistor Q11 is connected to the positive end of diode D10 and port GND2, pin 3 of transformer T2 is connected to one end of capacitor C23 and port GND3, pin 4 of transformer T2 is connected to the positive end of diode D11, the negative end of diode D11 is connected to the other end of capacitor C23, and capacitor C23 is connected to the controller of the three-phase PFC rectifier circuit and the DC / DC conversion circuit.

[0009] In traditional charging pile system equipment, an auxiliary power supply is often used to supply power to signal sampling circuits such as PFC / DCDC voltage, current, and communication, and at the same time, the input EMC filter 1 is directly connected to the power grid. In order to reduce the standby power consumption and standby reactive power loss of the charging pile module to meet the higher requirements of the charging pile industry for energy conservation and emission reduction, a circuit for reducing the standby power consumption of the charging pile module has been developed. By using three groups of power relays and a standby auxiliary power supply circuit, when the charging pile is working normally and charging, three power relays K1, K2, and K3 in the three phases connected to the power grid are connected, and the module is connected to the power grid by controlling the closing of the contacts of the three relays. When the charging pile module is on standby, the three power relays K1, K2, and K3 are controlled to disconnect. At this time, the EMC filter 1 is disconnected from the power grid, and the standby auxiliary power supply only supplies power to the MCU and communication circuits of PFC / DCDC, thus achieving the reduction of the standby power consumption and standby reactive power loss of the charging pile module by using only one standby auxiliary power supply circuit and three power relays, so as to meet the requirements of energy conservation and reduction of operating costs.

[0010] As a preferred improvement of the present invention: the output end of the auxiliary power supply circuit is connected to the voltage sampling circuits of the three-phase PFC rectifier circuit and the DC / DC conversion circuit.

[0011] As a preferred improvement of the present utility model: The EMC filter 1 includes a common-mode inductor L1 and a common-mode inductor L2. The other end of the relay K1 is connected to one end of the capacitor C1, one end of the capacitor C3, and the pin 1 of the common-mode inductor L1. The other end of the relay K2 is connected to the other end of the capacitor C1, one end of the capacitor C2, and the pin 3 of the common-mode inductor L1. The other end of the relay K3 is connected to the other end of the capacitor C2, the other end of the capacitor C3, one end of the capacitor C10, one end of the capacitor C11, one end of the capacitor C12, and the pin 5 of the common-mode inductor L1. The other ends of the capacitor C10, the capacitor C11, and the capacitor C12 are connected to the port GND1;

[0012] The pin 2 of the common-mode inductor L1 is connected to one end of the capacitor C4, one end of the capacitor C6, and the pin 1 of the common-mode inductor L2. The pin 4 of the common-mode inductor L1 is connected to the other end of the capacitor C4, one end of the capacitor C5, and the pin 3 of the common-mode inductor L2. The pin 6 of the common-mode inductor L1 is connected to the other end of the capacitor C5, the other end of the capacitor C6, one end of the capacitor C13, one end of the capacitor C14, one end of the capacitor C15, and the pin 5 of the common-mode inductor L2. The other ends of the capacitor C13, the capacitor C14, and the capacitor C15 are connected to the port GND1;

[0013] The pin 2 of the common-mode inductor L2 is connected to one end of the capacitor C7 and one end of the capacitor C9. The pin 4 of the common-mode inductor L2 is connected to the other end of the capacitor C7 and one end of the capacitor C8. The pin 6 of the common-mode inductor L2 is connected to the other end of the capacitor C8, the other end of the capacitor C9, one end of the capacitor C16, one end of the capacitor C17, and one end of the capacitor C18. The other ends of the capacitor C16, the capacitor C17, and the capacitor C18 are connected to the port GND1. One end of the capacitor C9, one end of the capacitor C8, and one end of the capacitor C18 are connected to the input end of the three-phase PFC rectifier circuit.

[0014] As a preferred improvement of the present utility model: One end of the capacitor C9 is connected to one end of the resistor R1 and one end of the relay K4. The other end of the resistor R1 is connected to the other end of the relay K4. One end of the capacitor C8 is connected to one end of the resistor R2 and one end of the relay K5. The other end of the resistor R2 is connected to the other end of the relay K5. The other end of the relay K4, the other end of the relay K5, and one end of the capacitor C18 are connected to the input end of the three-phase PFC rectifier circuit.

[0015] As a preferred improvement of the present utility model: One end of an inductor L3, one end of an inductor L4, and one end of an inductor L5 are connected to the input end of the three-phase PFC rectifier circuit. The other end of the inductor L3 is connected to the source electrode of a MOS transistor Q1 and the drain electrode of a MOS transistor Q4. The other end of the inductor L4 is connected to the source electrode of a MOS transistor Q2 and the drain electrode of a MOS transistor Q5. The other end of the inductor L5 is connected to the source electrode of a MOS transistor Q3 and the drain electrode of a MOS transistor Q6. The drain electrode of the MOS transistor Q1 is connected to the drain electrodes of the MOS transistor Q2, the MOS transistor Q3, and one end of a capacitor C19. The source electrode of the MOS transistor Q4 is connected to the source electrodes of the MOS transistor Q5, the MOS transistor Q6, and one end of a capacitor C20. The other end of the capacitor C19 is connected to the other end of the capacitor C20. One end of the capacitor C19 and one end of the capacitor C20 are connected to the output end of the three-phase PFC rectifier circuit.

[0016] As a preferred improvement of the present utility model: The input end of the DC / DC conversion circuit is connected to the drain electrode of a MOS transistor Q7 and the source electrode of a MOS transistor Q9. The drain electrode of the MOS transistor Q7 is connected to the drain electrode of a MOS transistor Q8. The source electrode of the MOS transistor Q7 is connected to the drain electrode of the MOS transistor Q9 and one end of a capacitor C100. The source electrode of the MOS transistor Q8 is connected to one end of an inductor L7 and the drain electrode of a MOS transistor Q10. The source electrode of the MOS transistor Q9 is connected to the source electrode of the MOS transistor Q10. The other end of the inductor L7 is connected to pin 1 of a transformer T1. The other end of the capacitor C100 is connected to pin 2 of the transformer T1. Pin 3 of the transformer T1 is connected to the positive end of a diode D2 and the negative end of a diode D4. Pin 4 of the transformer T1 is connected to the positive end of a diode D1 and the negative end of a diode D3. The negative end of the diode D1 is connected to the negative end of the diode D2 and one end of a capacitor C22. The positive end of the diode D3 is connected to the positive end of the diode D4 and one end of a capacitor C21. The other end of the capacitor C22 is connected to the other end of the capacitor C21.

[0017] As a preferred improvement of the present utility model: The input end of the auxiliary power supply circuit is connected to pin 1 of a transformer T3 and the source electrode of a MOS transistor Q12. Pin 2 of the transformer T3 is connected to the drain electrode of the MOS transistor Q12. The source electrode of the MOS transistor Q12 is connected to port GND2. Pin 3 of the transformer T3 is connected to one end of a capacitor C24 and port GND3. Pin 4 of the transformer T3 is connected to the positive end of a diode D12. The negative end of the diode D12 is connected to the other end of the capacitor C24. The capacitor C24 is connected to the controllers of the three-phase PFC rectifier circuit and the DC / DC conversion circuit.

[0018] As a preferred improvement of the present utility model: the specification of the transformer T3 is EF2525, and the specification of the transformer T2 is EE10.

[0019] The beneficial effects of the present utility model are as follows:

[0020] Through a circuit for reducing the standby power consumption of the charging pile module, the charging pile module can have lower standby power consumption and reactive power loss. By adding three power relays, a small three-phase EMC filter, a three-phase rectifier circuit, and a standby auxiliary power source in the charging pile module, and controlling the opening and closing of the three power relays and the low power consumption of the standby auxiliary power source, the standby power consumption and reactive power loss of the charging pile module are reduced, thereby achieving energy conservation and reducing operating costs, and increasing market competitiveness. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, where:

[0022] Figure 1 It is a schematic diagram of a circuit for reducing the standby power consumption of a charging pile module of the present utility model;

[0023] Figure 2 It is a schematic diagram of the EMC filter 1 circuit of the present utility model;

[0024] Figure 3 It is a schematic diagram of the three-phase PFC rectifier circuit of the present utility model;

[0025] Figure 4 It is a schematic diagram of the DC / DC conversion circuit of the present utility model;

[0026] Figure 5 It is a schematic diagram of the three-phase rectifier connection of the present utility model;

[0027] Figure 6 It is a schematic diagram of the standby auxiliary power source circuit of the present utility model;

[0028] Figure 7 It is a schematic diagram of the auxiliary power source circuit of the present utility model. Detailed Embodiments

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0034] Please refer to Figure 1As shown in the figure, the present utility model provides a circuit for reducing the standby power consumption of a charging pile module, including a U-line port, a V-line port, and a W-line port. The U-line port is connected to one end of a relay K1, the V-line port is connected to one end of a relay K2, and the W-line port is connected to one end of a relay K3. The other ends of the relay K1, the relay K2, and the relay K3 are connected to the input end of an EMC filter 1. The output end of the EMC filter 1 is connected to the input end of a three-phase PFC rectifier circuit. The output end of the three-phase PFC rectifier circuit is connected to the input end of a DC / DC conversion circuit and the input end of an auxiliary power source circuit. The output end of the auxiliary power source circuit is connected to the controllers of the three-phase PFC rectifier circuit and the DC / DC conversion circuit. The output end of the auxiliary power source circuit is connected to the voltage sampling circuits of the three-phase PFC rectifier circuit and the DC / DC conversion circuit, as well as a communication circuit for power supply. The U-line port, the V-line port, and the W-line port are connected to an EMC filter 2. The EMC filter 2 is connected to a three-phase rectifier circuit. The three-phase rectifier circuit is connected to a standby auxiliary power source circuit. The standby auxiliary power source circuit is connected to the controllers of the three-phase PFC rectifier circuit and the DC / DC conversion circuit for power supply.

[0035] Specifically, a circuit for reducing the standby power consumption of a charging pile module is disclosed, including five power relays, two auxiliary power source circuits, two EMC filters, a three-phase rectifier circuit, a three-phase PFC rectifier circuit, a DC / DC conversion circuit, etc. Three power relays (K1, K2, K3) are added at the three-phase power grid port of the charging pile module. A small three-phase EMC filter circuit (EMC filter 2) is connected in front of the three power relays (K1, K2, K3). After the small three-phase EMC filter circuit (EMC filter 2), it passes through a three-phase bridge rectifier circuit (three-phase rectification) to provide an input voltage for the standby auxiliary power source circuit (standby auxiliary power source). Relays K4 and K5 are used as AC input relays, and relays K1, K2, and K3 are used as control standby relays. In the rectification mode (AC-DC): The three AC input power relays (K1, K2, K3) are closed. The three-phase alternating current passes through the three-phase EMC filter circuit (EMC filter 1), then through pre-charge resistors R1 and R2, and then through the three-phase PFC rectifier circuit to supply power to the auxiliary power source. The auxiliary power source works normally to supply power to the voltage and current sampling signals in the PFC / DC-DC. In the standby mode, the three-phase input power relays K1, K2, and K3 are disconnected. The three-phase EMC filter circuit (EMC filter 1), the PFC / DC-DC conversion circuit, and the auxiliary power source of the charging pile module stop working and are disconnected from the three-phase power grid. The three-phase alternating current passes through the small EMC filter 2 and the three-phase rectifier circuit to supply power to the standby auxiliary power source. The output of the standby auxiliary power source is provided to the MCU of the PFC, the MCU of the DC-DC converter, and the communication circuit to work. This process can achieve the reduction of the standby power consumption and reactive power loss of the charging pile module, thus meeting the goals of energy conservation and reducing operating costs.

[0036] Please refer to Figure 2 As shown, the EMC filter 1 includes a common-mode inductor L1 and a common-mode inductor L2. The other end of the relay K1 is connected to one end of the capacitor C1, one end of the capacitor C3, and the pin 1 of the common-mode inductor L1. The other end of the relay K2 is connected to the other end of the capacitor C1, one end of the capacitor C2, and the pin 3 of the common-mode inductor L1. The other end of the relay K3 is connected to the other end of the capacitor C2, the other end of the capacitor C3, one end of the capacitor C10, one end of the capacitor C11, one end of the capacitor C12, and the pin 5 of the common-mode inductor L1. The other ends of the capacitor C10, the capacitor C11, and the capacitor C12 are connected to the port GND1. The pin 2 of the common-mode inductor L1 is connected to one end of the capacitor C4, one end of the capacitor C6, and the pin 1 of the common-mode inductor L2. The pin 4 of the common-mode inductor L1 is connected to the other end of the capacitor C4, one end of the capacitor C5, and the pin 3 of the common-mode inductor L2. The pin 6 of the common-mode inductor L1 is connected to the other end of the capacitor C5, the other end of the capacitor C6, one end of the capacitor C13, one end of the capacitor C14, one end of the capacitor C15, and the pin 5 of the common-mode inductor L2. The other ends of the capacitor C13, the capacitor C14, and the capacitor C15 are connected to the port GND1. The pin 2 of the common-mode inductor L2 is connected to one end of the capacitor C7 and one end of the capacitor C9. The pin 4 of the common-mode inductor L2 is connected to the other end of the capacitor C7 and one end of the capacitor C8. The pin 6 of the common-mode inductor L2 is connected to the other end of the capacitor C8, the other end of the capacitor C9, one end of the capacitor C16, one end of the capacitor C17, and one end of the capacitor C18. The other ends of the capacitor C16, the capacitor C17, and the capacitor C18 are connected to the port GND1. One ends of the capacitor C9, the capacitor C8, and the capacitor C18 are connected to the input end of the three-phase PFC rectifier circuit. One end of the capacitor C9 is connected to one end of the resistor R1 and one end of the relay K4. The other end of the resistor R1 is connected to the other end of the relay K4. One end of the capacitor C8 is connected to one end of the resistor R2 and one end of the relay K5. The other end of the resistor R2 is connected to the other end of the relay K5. The other ends of the relay K4, the relay K5, and one end of the capacitor C18 are connected to the input end of the three-phase PFC rectifier circuit.

[0037] Please refer to Figure 3As shown, one end of the inductor L3 (connected to the relay K4), one end of the inductor L4 (connected to the relay K5), and one end of the inductor L5 (connected to one end of the capacitor C18) are connected to the input end of the three-phase PFC rectifier circuit. The other end of the inductor L3 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q4. The other end of the inductor L4 is connected to the source of the MOS transistor Q2 and the drain of the MOS transistor Q5. The other end of the inductor L5 is connected to the source of the MOS transistor Q3 and the drain of the MOS transistor Q6. The drain of the MOS transistor Q1 is connected to the drain of the MOS transistor Q2, the drain of the MOS transistor Q3, and one end of the capacitor C19. The source of the MOS transistor Q4 is connected to the source of the MOS transistor Q5, the source of the MOS transistor Q6, and one end of the capacitor C20. The other end of the capacitor C19 is connected to the other end of the capacitor C20. One end of the capacitor C19 and one end of the capacitor C20 are connected to the output end of the three-phase PFC rectifier circuit.

[0038] Please refer to Figure 4 As shown, the input end of the DC / DC conversion circuit is connected to the drain of the MOS transistor Q7 (connected to one end of the capacitor C19) and the source of the MOS transistor Q9 (connected to one end of the capacitor C20). The drain of the MOS transistor Q7 is connected to the drain of the MOS transistor Q8. The source of the MOS transistor Q7 is connected to the drain of the MOS transistor Q9 and one end of the capacitor C100. The source of the MOS transistor Q8 is connected to one end of the inductor L7 and the drain of the MOS transistor Q10. The source of the MOS transistor Q9 is connected to the source of the MOS transistor Q10. The other end of the inductor L7 is connected to pin 1 of the transformer T1. The other end of the capacitor C100 is connected to pin 2 of the transformer T1. Pin 3 of the transformer T1 is connected to the positive end of the diode D2 and the negative end of the diode D4. Pin 4 of the transformer T1 is connected to the positive end of the diode D1 and the negative end of the diode D3. The negative end of the diode D1 is connected to the negative end of the diode D2 and one end of the capacitor C22. The positive end of the diode D3 is connected to the positive end of the diode D4 and one end of the capacitor C21. The other end of the capacitor C22 is connected to the other end of the capacitor C21. One end of the capacitor C21 and one end of the capacitor C22 are the output ports of the circuit.

[0039] Please refer to Figures 5-6As shown, the U-line port is connected to pin 1 of the common-mode inductor L6, the V-line port is connected to pin 3 of the common-mode inductor L6, the W-line port is connected to pin 5 of the common-mode inductor L6. Pin 2 of the common-mode inductor L6 is connected to the positive terminal of diode D5 and the negative terminal of diode D8. Pin 4 of the common-mode inductor L6 is connected to the positive terminal of diode D6 and the negative terminal of diode D9. Pin 6 of the common-mode inductor L6 is connected to the positive terminal of diode D7 and the negative terminal of diode D10. The negative terminal of diode D5 is connected to the negative terminals of diode D6 and diode D7. The positive terminal of diode D8 is connected to the positive terminals of diode D9 and diode D10. The negative terminal of diode D7 is connected to pin 1 of transformer T2. Pin 2 of transformer T2 is connected to the drain of MOS transistor Q11. The source of MOS transistor Q11 is connected to the positive terminal of diode D10 and port GND2. Pin 3 of transformer T2 is connected to one end of capacitor C23 and port GND3. Pin 4 of transformer T2 is connected to the positive terminal of diode D11. The negative terminal of diode D11 is connected to the other end of capacitor C23. Capacitor C23 is connected to the controller of the three-phase PFC rectifier circuit and the DC / DC conversion circuit.

[0040] Please refer to Figure 7 As shown, the input terminal of the auxiliary power source circuit is connected to pin 1 of transformer T3 and the source of MOS transistor Q12. Pin 2 of transformer T3 is connected to the drain of MOS transistor Q12. The source of MOS transistor Q12 is connected to port GND2. Pin 3 of transformer T3 is connected to one end of capacitor C24 and port GND3. Pin 4 of transformer T3 is connected to the positive terminal of diode D12. The negative terminal of diode D12 is connected to the other end of capacitor C24. Capacitor C24 is connected to the controller of the three-phase PFC rectifier circuit and the DC / DC conversion circuit. As an implementation, the specification of transformer T3 is EF2525, and the specification of transformer T2 is EE10. The difference between the standby auxiliary power source and the auxiliary power source is that the standby auxiliary power source circuit only powers the PFC DSP and DCDC DSP during standby, and its power consumption is much smaller than that of the auxiliary power source circuit. In addition to powering the PFC DSP and DCDC DSP, the auxiliary power source circuit is also responsible for powering circuits such as voltage and current sampling and power MOS transistor driving. The transformer size and power device selection of the standby auxiliary power source are also much smaller than those of the auxiliary power source circuit.

[0041] Working principle: A circuit for reducing the standby power consumption of a charging pile module includes five power relays, several power resistors, a three-phase rectifier circuit, an auxiliary power source circuit, a standby auxiliary power source circuit, a three-phase PFC rectifier circuit, and a DCDC conversion circuit, etc. One side of the contacts of three power relays (K1, K2, K3) is connected to the three-phase power grid, and the other side of the contacts is connected to a three-phase power EMC filter (EMC filter 1). Two phases on one side of the three-phase power EMC filter (EMC filter 1) are connected to one side of the contacts of power relays (K4, K5). Power resistors are connected in parallel between the contacts of power relays K4 and K5 as pre-charge resistors to provide a power supply loop for the auxiliary power source of the charging pile module. A small filter is selected as the EMC filter (EMC filter 2) in the standby auxiliary power source loop. The three-phase voltage is rectified by the three-phase rectifier to provide input for the standby auxiliary power source, and the standby auxiliary power source provides power supply for the MCU of the three-phase PFC rectifier circuit / DCDC conversion circuit. In the normal working mode (AC-DC): The three AC input relays (K1, K2, K3) are closed. The three-phase voltage passes through the EMC filter 1 and then through the power resistors (R1, R2) connected in parallel with the input relays (K4, K5), and the three-phase PFC rectifier circuit provides the voltage source for the auxiliary power source circuit. The auxiliary power source circuit provides the working voltage for each signal such as voltage and current sampling, control, and communication in the three-phase PFC rectification and DCDC conversion circuits. When the charging pile module receives the startup instruction, the power relays K4 and K5 are closed, and the charging pile module can work normally and output with load. In the standby mode: The three-phase input power relays K1, K2, and K3 of the charging pile module system are disconnected. The three-phase PFC rectifier circuit, the auxiliary power source circuit, and the DCDC conversion circuit are all disconnected from the power grid and enter the standby mode, and the large-capacity safety capacitors in the EMC filter 1 are also disconnected from the power grid. The three-phase alternating current passes through the small EMC filter (EMC filter 2) and then through the three-phase rectifier circuit to provide input for the standby auxiliary power source. The standby auxiliary power source provides the working voltage for the minimum control units (i.e., PFC DSP and DCDC DSP) and the communication circuit in the three-phase PFC rectification and DCDC conversion circuits. That is, the charging pile module enters the minimum standby unit mode, and the power consumption can be reduced to a great extent. And because the large-capacity safety capacitors in the three-phase filter (EMC filter 1) are disconnected from the power grid, the reactive power loss during the standby of the charging pile module is also reduced to a great extent. The requirements for energy conservation and reduction of operating costs in commercial applications are realized, and the market competitiveness of the charging pile module products is improved.

[0042] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. A circuit for reducing the standby power consumption of a charging pile module, characterized in that: It includes a U-line port, a V-line port, and a W-line port. The U-line port is connected to one end of relay K1, the V-line port is connected to one end of relay K2, and the W-line port is connected to one end of relay K3. The other ends of relay K1, relay K2, and relay K3 are connected to the input end of EMC filter 1. The output end of EMC filter 1 is connected to the input end of a three-phase PFC rectifier circuit. The output end of the three-phase PFC rectifier circuit is connected to the input end of a DC / DC conversion circuit and the input end of an auxiliary power supply circuit. The output end of the auxiliary power supply circuit is connected to the controllers of the three-phase PFC rectifier circuit and the DC / DC conversion circuit; The U-line port is connected to pin 1 of common-mode inductor L6, the V-line port is connected to pin 3 of common-mode inductor L6, and the W-line port is connected to pin 5 of common-mode inductor L6. Pin 2 of common-mode inductor L6 is connected to the positive end of diode D5 and the negative end of diode D8. Pin 4 of common-mode inductor L6 is connected to the positive end of diode D6 and the negative end of diode D9. Pin 6 of common-mode inductor L6 is connected to the positive end of diode D7 and the negative end of diode D10. The negative end of diode D5 is connected to the negative ends of diode D6 and diode D7. The positive end of diode D8 is connected to the positive ends of diode D9 and diode D10; The negative end of diode D7 is connected to pin 1 of transformer T2. Pin 2 of transformer T2 is connected to the drain of MOS transistor Q11. The source of MOS transistor Q11 is connected to the positive end of diode D10 and port GND2. Pin 3 of transformer T2 is connected to one end of capacitor C23 and port GND3. Pin 4 of transformer T2 is connected to the positive end of diode D11. The negative end of diode D11 is connected to the other end of capacitor C23. Capacitor C23 is connected to the controllers of the three-phase PFC rectifier circuit and the DC / DC conversion circuit.

2. The circuit for reducing the standby power consumption of a charging pile module according to claim 1, wherein: The output end of the auxiliary power supply circuit is connected to the voltage sampling circuits of the three-phase PFC rectifier circuit and the DC / DC conversion circuit.

3. A circuit for reducing the standby power consumption of a charging pile module according to claim 1, characterized in that: EMC filter 1 includes common-mode inductor L1 and common-mode inductor L2. The other end of relay K1 is connected to one end of capacitor C1, one end of capacitor C3, and pin 1 of common-mode inductor L1. The other end of relay K2 is connected to the other end of capacitor C1, one end of capacitor C2, and pin 3 of common-mode inductor L1. The other end of relay K3 is connected to the other end of capacitor C2, the other end of capacitor C3, one end of capacitor C10, one end of capacitor C11, one end of capacitor C12, and pin 5 of common-mode inductor L1. The other ends of capacitor C10, capacitor C11, and capacitor C12 are connected to port GND1; Pin 2 of the common-mode inductor L1 is connected to one end of capacitor C4, one end of capacitor C6, and pin 1 of the common-mode inductor L2. Pin 4 of the common-mode inductor L1 is connected to the other end of capacitor C4, one end of capacitor C5, and pin 3 of the common-mode inductor L2. Pin 6 of the common-mode inductor L1 is connected to the other end of capacitor C5, the other end of capacitor C6, one end of capacitor C13, one end of capacitor C14, one end of capacitor C15, and pin 5 of the common-mode inductor L2. The other ends of capacitor C13, capacitor C14, and capacitor C15 are connected to port GND1; Pin 2 of the common-mode inductor L2 is connected to one end of capacitor C7 and one end of capacitor C9. Pin 4 of the common-mode inductor L2 is connected to the other end of capacitor C7 and one end of capacitor C8. Pin 6 of the common-mode inductor L2 is connected to the other end of capacitor C8, the other end of capacitor C9, one end of capacitor C16, one end of capacitor C17, and one end of capacitor C18. The other ends of capacitor C16, capacitor C17, and capacitor C18 are connected to port GND1. One end of capacitor C9, one end of capacitor C8, and one end of capacitor C18 are connected to the input end of the three-phase PFC rectifier circuit.

4. A circuit for reducing the standby power consumption of a charging pile module according to claim 3, characterized in that: One end of capacitor C9 is connected to one end of resistor R1 and one end of relay K4. The other end of resistor R1 is connected to the other end of relay K4. One end of capacitor C8 is connected to one end of resistor R2 and one end of relay K5. The other end of resistor R2 is connected to the other end of relay K5. The other end of relay K4, the other end of relay K5, and one end of capacitor C18 are connected to the input end of the three-phase PFC rectifier circuit.

5. A circuit for reducing the standby power consumption of a charging pile module according to claim 1, characterized in that: The input end of the three-phase PFC rectifier circuit is connected to one end of inductor L3, one end of inductor L4, and one end of inductor L5. The other end of inductor L3 is connected to the source of MOS transistor Q1 and the drain of MOS transistor Q4. The other end of inductor L4 is connected to the source of MOS transistor Q2 and the drain of MOS transistor Q5. The other end of inductor L5 is connected to the source of MOS transistor Q3 and the drain of MOS transistor Q6. The drain of MOS transistor Q1 is connected to the drains of MOS transistor Q2, MOS transistor Q3, and one end of capacitor C19. The source of MOS transistor Q4 is connected to the sources of MOS transistor Q5, MOS transistor Q6, and one end of capacitor C20. The other end of capacitor C19 is connected to the other end of capacitor C20. One end of capacitor C19 and one end of capacitor C20 are connected to the output end of the three-phase PFC rectifier circuit.

6. The circuit for reducing the standby power consumption of a charging pile module according to claim 1, wherein: The input terminal of the DC / DC conversion circuit is connected to the drain of MOS transistor Q7 and the source of MOS transistor Q9. The drain of MOS transistor Q7 is connected to the drain of MOS transistor Q8. The source of MOS transistor Q7 is connected to the drain of MOS transistor Q9 and one end of capacitor C100. The source of MOS transistor Q8 is connected to one end of inductor L7 and the drain of MOS transistor Q10. The source of MOS transistor Q9 is connected to the source of MOS transistor Q10. The other end of inductor L7 is connected to pin 1 of transformer T1. The other end of capacitor C100 is connected to pin 2 of transformer T1. Pin 3 of transformer T1 is connected to the positive terminal of diode D2 and the negative terminal of diode D4. Pin 4 of transformer T1 is connected to the positive terminal of diode D1 and the negative terminal of diode D3. The negative terminal of diode D1 is connected to the negative terminal of diode D2 and one end of capacitor C22. The positive terminal of diode D3 is connected to the positive terminal of diode D4 and one end of capacitor C21. The other end of capacitor C22 is connected to the other end of capacitor C21.

7. A circuit for reducing the standby power consumption of a charging pile module according to claim 1, characterized in that: The input terminal of the auxiliary source circuit is connected to pin 1 of transformer T3 and the source of MOS transistor Q12. Pin 2 of transformer T3 is connected to the drain of MOS transistor Q12. The source of MOS transistor Q12 is connected to port GND2. Pin 3 of transformer T3 is connected to one end of capacitor C24 and port GND3. Pin 4 of transformer T3 is connected to the positive terminal of diode D12. The negative terminal of diode D12 is connected to the other end of capacitor C24. Capacitor C24 is connected to the controller of the three-phase PFC rectification circuit and the DC / DC conversion circuit.

8. A circuit for reducing the standby power consumption of a charging pile module according to claim 7, characterized in that: The specification of transformer T3 is EF2525, and the specification of transformer T2 is EE10.

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