Auxiliary power supply capable of reducing standby power consumption

Abstract

The utility model belongs to the technical field of charging piles, and discloses an auxiliary power supply capable of reducing standby power consumption, which comprises a primary PFC auxiliary power supply unit, a secondary PFC auxiliary power supply unit, a primary DC-DC auxiliary power supply unit, a PFC chip control unit and a DC-DC chip control unit, the output end of the primary PFC auxiliary power supply unit is respectively connected with the secondary PFC auxiliary power supply unit, the primary DC-DC auxiliary power supply unit and the PFC chip control unit, the secondary PFC auxiliary power supply unit and the primary DC-DC auxiliary power supply unit are connected with the DC-DC chip control unit, and the DC-DC chip control unit is connected with the PFC chip control unit. According to the utility model, low-power and high-power auxiliary sources are used for dual power supply, so that the auxiliary sources can be switched between standby and working states at any time.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, in particular to an auxiliary power supply for reducing standby power consumption. Background Art

[0002] With the development of society, the amount of energy used by humans is increasing, and the need for energy-saving technologies is also getting higher. There are multiple auxiliary power supplies inside the charging pile module. As the power of the charging pile increases, the standby loss of the corresponding auxiliary power supply also becomes larger. The traditional auxiliary power supplies of the charging pile module are divided into PFC auxiliary power supply and DCDC auxiliary power supply. In the non-charging standby state, both the PFC and DCDC auxiliary power supplies are working, thus increasing the standby loss of the charging pile.

[0003] Therefore, it is necessary to provide an auxiliary power supply for reducing standby power consumption to reduce the loss of the auxiliary power supply of the charging pile during standby. Summary of the Utility Model

[0004] The utility model discloses an auxiliary power supply for reducing standby power consumption, belonging to the field of power electronics, 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] An auxiliary power supply for reducing standby power consumption, used for a charging pile. The charging pile includes an AC power input. The output end of the AC power input is connected to the input end of a PFC boost circuit. The output end of the PFC boost circuit is connected to the input end of a DC-DC circuit. The output end of the DC-DC circuit is connected to a charging gun. The auxiliary power supply includes a primary PFC auxiliary power supply unit, a secondary PFC auxiliary power supply unit, a primary DC-DC auxiliary power supply unit, a PFC chip control unit, and a DC-DC chip control unit. The input end of the primary PFC auxiliary power supply unit is connected to the output end of the PFC boost circuit. The output end of the primary PFC auxiliary power supply unit is respectively connected to the secondary PFC auxiliary power supply unit, the primary DC-DC auxiliary power supply unit, and the PFC chip control unit. The secondary PFC auxiliary power supply unit and the primary DC-DC auxiliary power supply unit are connected to the DC-DC chip control unit. The DC-DC chip control unit and the PFC chip control unit are connected.

[0007] As a preferred improvement of the present utility model: The output end of the PFC boost circuit is connected to the PFC_BUS port of the first-stage PFC auxiliary power supply unit. The PFC_BUS port is connected to one end of resistor R1, one end of capacitor C1, one end of resistor R2, and pin 1 of transformer T1. The other end of resistor R1 is connected to port VCC1 and pin 7 of control chip U1. The other end of capacitor C1 is connected to the other end of resistor R2 and the negative end of diode D1. Pin 2 of transformer T1 is connected to the positive end of diode D1 and the drain of MOS transistor Q1. The gate of MOS transistor Q1 is connected to one end of resistor R8. The other end of resistor R8 is connected to pin 6 of control chip U1. The source of MOS transistor Q1 is connected to port CS1 and one end of resistor R3. The other end of resistor R3 is connected to port PGND. Pin 1 of control chip U1 is connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of resistor R6. The other end of resistor R6 is connected to one end of resistor R4, one end of resistor R5, and pin 2 of control chip U1. The other end of resistor R4 is connected to port PFC_AUX1_OUT1. Pin 3 of control chip U1 is connected to port CS1. Pin 4 of control chip U1 is connected to one end of resistor R7 and one end of capacitor C3. The other end of resistor R7 is connected to port VREF1. The other end of capacitor C3 is connected to the other end of resistor R5 and port PGND. Pin 5 of control chip U1 is connected to port PGND. Pin 8 of control chip U1 is connected to port VREF1;

[0008] Pin 3 of transformer T1 is connected to the positive end of diode D2. The negative end of diode D2 is connected to one end of capacitor C4 and port PFC_AUX1_OUT1. Pin 4 of transformer T1 is connected to the other end of capacitor C4 and port PGND. Port PFC_AUX1_OUT1 is connected to the PFC chip control unit;

[0009] Pin 5 of transformer T1 is connected to the positive end of diode D3. The negative end of diode D3 is connected to one end of capacitor C5 and port PFC_AUX1_OUT2. Pin 6 of transformer T1 is connected to the other end of capacitor C5 and port AGND1. Port PFC_AUX1_OUT2 is connected to the first-stage DC-DC auxiliary power supply unit;

[0010] Pin 7 of transformer T1 is connected to the positive end of diode D4. The negative end of diode D4 is connected to one end of capacitor C6 and port PFC_AUX1_OUT3. Pin 8 of transformer T1 is connected to the other end of capacitor C6 and port AGND2. Port PFC_AUX1_OUT3 is connected to the second-stage PFC auxiliary power supply unit;

[0011] Pin 9 of the transformer T1 is connected to the positive terminal of the diode D5, and the negative terminal of the diode D5 is connected to one end of the capacitor C7 and the port PFC_DRIVER. Pin 10 of the transformer T1 is connected to the other end of the capacitor C7 and the port PGND;

[0012] Pin 11 of the transformer T1 is connected to the positive terminal of the diode D6, and the negative terminal of the diode D6 is connected to one end of the capacitor C8 and the port VCC1. Pin 12 of the transformer T1 is connected to the other end of the capacitor C8 and the port PGND. Pins 1 and 2 of the transformer T1 share a coil, pins 3 and 4 of the transformer T1 share a coil, pins 5 and 6 of the transformer T1 share a coil, and so on.

[0013] As a preferred improvement of the present invention: The port PFC_DRIVER is connected to the PFC boost circuit and supplies power to the switching transistor and / or MCU of the PFC boost circuit.

[0014] As a preferred improvement of the present invention: The PFC chip control unit is connected to the port DC_SMPS_SD. One end of the resistor R9 is connected to the port DC_SMPS_SD. The other end of the resistor R9 is connected to the anode of the optocoupler OT1. The cathode of the optocoupler OT1 is connected to the port PGND. The collector of the optocoupler OT1 is connected to the port VREF2. The emitter of the optocoupler OT1 is connected to the port DC_SD and one end of the resistor R10. The other end of the resistor R10 is connected to the port AGND1. The port DC_SD and the port VREF2 are connected to the primary DC-DC auxiliary power supply unit.

[0015] As a preferred improvement of the present utility model: The primary DC-DC auxiliary power supply unit includes a resistor R9. One end of the resistor R9 is connected to port PFC_AUX1_OUT2, one end of a capacitor C9, one end of a resistor R10, and pin 1 of a transformer T2. The other end of the resistor R9 is connected to port VCC2 and pin 7 of a control chip U2. The other end of the capacitor C9 is connected to the other end of the resistor R10 and the negative end of a diode D7. Pin 2 of the transformer T2 is connected to the positive end of the diode D7 and the drain of a MOS transistor Q2. The gate of the MOS transistor Q2 is connected to one end of a resistor R13. The other end of the resistor R13 is connected to pin 6 of the control chip U2. The source of the MOS transistor Q2 is connected to port CS2 and one end of a resistor R14. The other end of the resistor R14 is connected to port AGND1. Pin 1 of the control chip U2 is connected to port DC_SD, one end of a resistor R11, and the collector of an optocoupler OT2. The other end of the resistor R11 is connected to port VREF2. Pin 3 of the control chip U2 is connected to port CS2. Pin 4 of the control chip U2 is connected to one end of a resistor R12 and one end of a capacitor C10. The other end of the resistor R12 is connected to port VREF2. The other end of the capacitor C10 is connected to the emitter of the optocoupler OT2 and port AGND1. Pin 5 of the control chip U2 is connected to port AGND1. Pin 8 of the control chip U2 is connected to port VREF2;

[0016] Pin 3 of the transformer T2 is connected to the positive end of a diode D8. The negative end of the diode D8 is connected to one end of a capacitor C11, one end of a resistor R15, one end of a resistor R16, and port DC_AUX1_OUT1. Pin 4 of the transformer T2 is connected to the other end of the capacitor C11 and port DGND1. The other end of the resistor R15 is connected to the anode of the optocoupler OT2. The cathode of the optocoupler OT2 is connected to pin 3 of a voltage regulator diode Z1. The other end of the resistor R16 is connected to pin 1 of the voltage regulator diode Z1 and one end of a resistor R17. Pin 2 of the voltage regulator diode Z1 is connected to the other end of the resistor R17 and port DGND1. Port DC_AUX1_OUT1 is connected to a DC-DC chip control unit;

[0017] Pin 5 of the transformer T2 is connected to the positive end of a diode D9. The negative end of the diode D9 is connected to one end of a capacitor C12 and port DC_DRIVER. Pin 6 of the transformer T2 is connected to the other end of the capacitor C12 and port DGND2;

[0018] Pin 7 of the transformer T2 is connected to the positive end of a diode D10. The negative end of the diode D10 is connected to one end of a capacitor C13 and port VCC2. Pin 8 of the transformer T2 is connected to the other end of the capacitor C13 and port AGND1.

[0019] As a preferred improvement of the present utility model: The port DC_DRIVER is connected to a DC-DC boost circuit and supplies power to the switching tube and / or MCU of the DC-DC boost circuit.

[0020] As a preferred improvement of the present utility model: The secondary PFC auxiliary power supply unit includes a resistor R26. One end of the resistor R26 is connected to the port PFC_AUX1_OUT3, one end of a capacitor C14, one end of a resistor R18, and pin 1 of a transformer T3. The other end of the resistor R26 is connected to the port VCC3 and pin 7 of a control chip U3. The other end of the capacitor C14 is connected to the other end of the resistor R18 and the negative end of a diode D11. Pin 2 of the transformer T3 is connected to the positive end of the diode D11 and the drain of a MOS tube Q3. The gate of the MOS tube Q3 is connected to one end of a resistor R21. The other end of the resistor R21 is connected to pin 6 of the control chip U3. The source of the MOS tube Q3 is connected to the port CS3 and one end of a resistor R22. The other end of the resistor R22 is connected to the port AGND2. Pin 1 of the control chip U3 is connected to one end of a resistor R19 and the collector of an optocoupler OT3. The other end of the resistor R19 is connected to the port VREF3. Pin 2 of the control chip U3 is connected to the port AGND2. Pin 3 of the control chip U3 is connected to the port CS3. Pin 4 of the control chip U3 is connected to one end of a resistor R20 and one end of a capacitor C15. The other end of the resistor R20 is connected to the port VREF3. The other end of the capacitor C15 is connected to the emitter of the optocoupler OT3 and the port AGND2. Pin 5 of the control chip U3 is connected to the port AGND2. Pin 8 of the control chip U3 is connected to the port VREF3;

[0021] Pin 3 of the transformer T3 is connected to the positive end of a diode D12. The negative end of the diode D12 is connected to one end of a capacitor C16, one end of a resistor R23, one end of a resistor R24, and the port PFC_AUX2_OUT1. Pin 4 of the transformer T3 is connected to the other end of the capacitor C16 and the port DGND1. The other end of the resistor R23 is connected to the anode of the optocoupler OT3. The cathode of the optocoupler OT3 is connected to pin 3 of a voltage regulator diode Z2. The other end of the resistor R24 is connected to pin 1 of the voltage regulator diode Z2 and one end of a resistor R25. Pin 2 of the voltage regulator diode Z2 is connected to the other end of the resistor R25 and the port DGND1. The port PFC_AUX2_OUT1 is connected to a DC-DC chip control unit;

[0022] Pin 5 of the transformer T3 is connected to the positive terminal of the diode D13. The negative terminal of the diode D13 is connected to one end of the capacitor C17 and the port VCC3. Pin 6 of the transformer T3 is connected to the other end of the capacitor C17 and the port AGND1.

[0023] The beneficial effects of the present utility model are as follows:

[0024] By controlling the level of the COMP pin of the power supply chip through the I / O of the single-chip microcomputer controller, the opening and closing of the auxiliary power supply are controlled, thereby reducing the loss of the auxiliary power supply of the charging pile in standby. The small-power and large-power auxiliary power supplies are used for dual power supply. When the large auxiliary power supply stops working, the small-power auxiliary power supply can still maintain the power supply for controlling the micro single-chip microcomputer, realizing the switching of the auxiliary power supply between standby and working states at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 is a connection schematic diagram of an auxiliary power supply for reducing standby power consumption of the present utility model;

[0027] Figure 2 is a schematic structural diagram of a primary PFC auxiliary power supply unit of the present utility model;

[0028] Figure 3 is a schematic structural diagram of a primary DC-DC auxiliary power supply unit of the present utility model;

[0029] Figure 4 is a schematic structural diagram of a secondary PFC auxiliary power supply unit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0031] It should be noted that all 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.

[0032] In addition, in the present invention, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly specified and defined, terms such as "connection", "fixation", etc. 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 can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. 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.

[0034] In addition, the technical solutions between 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.

[0035] Please refer to Figure 1 As shown, an auxiliary power supply and a charging pile for reducing standby power consumption include an AC power input unit, a PFC boost circuit unit, a DCDC circuit unit, a charging gun unit, a primary PFC auxiliary power supply unit, a secondary PFC auxiliary power supply unit, a primary DC-DC auxiliary power supply unit, a PFC chip control unit, and a DC-DC chip control unit. The connection relationships between the units are as shown. The PFC boost circuit unit outputs voltage to the primary PFC auxiliary power supply unit. The primary PFC auxiliary power supply unit supplies power to the PFC chip control unit and outputs voltage to the secondary PFC auxiliary power supply unit and the primary DC-DC auxiliary power supply unit. The secondary PFC auxiliary power supply unit and the primary DC-DC auxiliary power supply unit supply power to the DC-DC chip control unit. The primary DC-DC auxiliary power supply unit and the primary PFC auxiliary power supply unit also supply power to the switching tubes, control chips, sampling circuits, etc. inside the PFC boost circuit unit and the DCDC circuit unit.

[0036] The following specifically introduces how the charging pile achieves the function of reducing standby.

[0037] Please refer to Figure 2As shown, T1-A is the primary winding of flyback transformer T1. The non-polarity end is connected to the positive input PFC_BUS, and the polarity end is connected to the drain of switch MOS transistor Q1. The source of Q1 is connected to ground PGND through current sampling resistor R3. The anode of diode D1 is connected to the drain of Q1, and the cathode of D1 is connected to the parallel combination of R2 and C1 and then to PFC_BUS, forming an RCD absorption circuit. Port CS1 is connected to pin 3 of chip U1. Resistor R1 is a high-voltage start-up resistor, with one end connected to PFC_BUS and the other end connected to pin 7 of U1 and port VCC1. The drive output OUTPUT (pin 6) of U1 is connected to the gate of Q1 through current-limiting resistor R8. The reference voltage VREF1 of U1 is connected to pin 4 of U1 through R7. Pin 4 is connected to ground PGND through capacitor C3. R7 and C3 form an oscillation circuit. The output PFC_AUX1_OUT1 of the flyback circuit is connected to pin 2 of U1 through R4. Pin 2 is connected to ground through R5, and pin 2 is connected to pin 1 of U1 through the series combination of R6 and C2. Pin 5 of U1 is connected to PGND. The polarity end of the secondary winding T1_B of the flyback transformer is connected to the anode of D2, and the cathode of D2 is connected to the output PFC_AUX1_OUT1. Capacitor C4 is a filter capacitor, and the non-polarity end of T1_B is connected to PGND. The polarity end of the secondary winding T1_C of the flyback transformer is connected to the anode of D3, and the cathode of D3 is connected to the output PFC_AUX1_OUT2. C5 is a filter capacitor, and the non-polarity end of T1_C is connected to AGND1. The polarity end of the secondary winding T1_D of the flyback transformer is connected to the anode of D4, and the cathode of D4 is connected to the output PFC_AUX1_OUT3. C6 is a filter capacitor, and the non-polarity end of T1_D is connected to AGND2. The polarity end of the secondary winding T1_E of the flyback transformer is connected to the anode of D5, and the cathode of D5 is connected to the output PFC_DRIVER (for power supply to components such as the main circuit switch transistor and MCU). C7 is a filter capacitor, and the non-polarity end of T1_E is connected to PGND. The polarity end of the secondary winding T1_F of the flyback transformer is connected to the anode of D6, and the cathode of D6 is connected to the output VCC1. C8 is a filter capacitor, and the non-polarity end of T1_F is connected to PGND. PFC_AUX1_OUT1 supplies power to the PFC_MUC chip. The PFC_MUC chip controls the I / O port DC_SMPS_SD and is connected to pin 1 of optocoupler OT1 through resistor R9. Pin 2 of OT1 is connected to PGND, pin 3 of OT1 is connected to VREF2, pin 4 of OT1 is connected to DC_SD, and is connected to AGND1 through resistor R10.

[0038] Please refer to Figure 3As shown, T2-A is the primary winding of the flyback transformer T2. The terminal of opposite polarity is connected to PFC_AUX1_OUT2, and the terminal of the same polarity is connected to the drain of the switching MOS transistor Q2. The source of Q2 is connected to the ground AGND1 through the current sampling resistor R14. The anode of the diode D7 is connected to the drain of Q2, and the cathode of D7 is connected to the parallel combination of R10 and C9 and then to PFC_AUX1_OUT2, forming an RCD absorption circuit. CS2 is connected to pin 3 of U2. R9 is a high-voltage start-up resistor, one end of which is connected to PFC_AUX1_OUT2, and the other end is connected to pin 7 and VCC2 of the chip U2. The drive output OUTPUT of U2 is connected to the gate of Q2 through the current-limiting resistor R13. The reference voltage VREF2 of U2 is connected to pin 4 of U2 through the resistor R12. Pin 4 is connected to the ground AGND1 through C10. R7 and C3 form an oscillation circuit. VREF2 is connected to the port DC_SD through R11. The port DC_SD is connected to pin 1 of U2. Pin 1 of U2 is connected to pin 3 of the optocoupler OT2. Pin 4 of OT2 is connected to AGND1. Pin 5 of U2 is connected to AGND1. The terminal of the same polarity of the secondary winding T2_B of the flyback transformer is connected to the anode of D8, and the cathode of D8 is connected to the output DC_AUX1_OUT1. C11 is a filter capacitor. The terminal of opposite polarity of T2_B is connected to DGND1. DC_AUX1_OUT1 supplies power to DCDC_MUC. DC_AUX1_OUT1 is connected to pin 1 of OT2 through R15. Pin 2 of OT2 is connected to pin 3 of Z1. Pin 2 of Z1 is connected to DGND1. DC_AUX1_OUT1 is connected to pin 1 of Z1 through R16. Pin 1 of Z1 is connected to DGND1 through R17. The terminal of the same polarity of the secondary winding T2_C of the flyback transformer is connected to the anode of D9, and the cathode of D9 is connected to the output DC_DRIVER. C12 is a filter capacitor. The terminal of opposite polarity of T2_C is connected to DGND2. The terminal of the same polarity of the secondary winding T2_D of the flyback transformer is connected to the anode of D10, and the cathode of D10 is connected to the output VCC2. C13 is a filter capacitor. The terminal of opposite polarity of T2_D is connected to AGND1 together with the capacitor C13.

[0039] Please refer to Figure 4As shown, T3-A is the primary winding of the flyback transformer T3. The non-inverting terminal is connected to PFC_AUX1_OUT3, and the inverting terminal is connected to the drain of the switching MOS transistor Q3. The source of Q3 is connected to the ground AGND2 through the current sampling resistor R22. The anode of the diode D11 is connected to the drain of Q3, and the cathode of D11 is connected to the parallel-connected R18 and C14, and then connected to PFC_AUX1_OUT3, forming an RCD absorption circuit. The port CS3 is connected to the 3rd pin of the control chip U3. The resistor R26 is a high-voltage start-up resistor, one end is connected to PFC_AUX1_OUT3, and the other end is connected to the 7th pin and VCC3 of U3. The drive output OUTPUT of U3 is connected to the gate of Q3 through the current-limiting resistor R21. The reference voltage VREF3 of U3 is connected to the 4th pin of U2 through R20. The 4th pin is connected to the ground AGND2 through the capacitor C15. R20 and C15 form an oscillation circuit. VREF3 is connected to the 1st pin of U3 through R19. The 1st pin of U3 is connected to the 3rd pin of the optocoupler OT3. The 4th pin of OT3 is connected to AGND2, and the 5th pin of U3 is connected to AGND2. The inverting terminal of the secondary winding T3_B of the flyback transformer is connected to the anode of D12, and the cathode of D12 is connected to the output PFC_AUX2_OUT1. C16 is a filter capacitor. The non-inverting terminal of T3_B is connected to DGND1. PFC_AUX2_OUT1 provides power for DCDC_MUC. PFC_AUX2_OUT1 is connected to the 1st pin of OT3 through R23. The 2nd pin of OT3 is connected to the 3rd pin of Z2, and the 2nd pin of Z2 is connected to DGND1. PFC_AUX2_OUT1 is connected to the 1st pin of Z2 through R24. The 1st pin of Z2 is connected to the port DGND1 through the resistor R25.

[0040] Among them, the main control chip models of PFC_MCU and DC-DC_MCU are TI28035, the optocoupler OT1, OT2, OT3 models are LTV-1009, the Z1 and Z2 models are AZ431AN-ATRE, and the chip U1, U2, U3 models are UC2843BD1R2G.

[0041] Working principle:

[0042] Step 1: The AC power input of the charging pile is powered on. The primary PFC auxiliary power supply unit PFC_AUX1, the secondary PFC auxiliary power supply unit PFC_AUX2, the primary DC-DC auxiliary power supply unit DC_AUX1, the PFC chip control unit, and the DCDC chip control unit are all operating normally. Among them, the output PFC_AUX2_OUT1 of the secondary PFC auxiliary power supply unit PFC_AUX2 and the output DC_AUX1_OUT1 of the primary DC-DC auxiliary power supply unit DC_AUX1 are in a competitive relationship, and the one with the higher voltage supplies power to U2. The standby power of the primary PFC auxiliary power supply unit is 6W, the standby power of the secondary PFC auxiliary power supply unit PFC_AUX2 is 2W, the standby power of the primary DC-DC auxiliary power supply unit is 10W, and the total standby power consumption of the entire charging pile is 18W.

[0043] Step 2: When the charging pile DC-DC_MCU works normally for 30S and does not receive a startup instruction, DCDC_MCU enters the standby mode. The I / O port DC_SMPS_SD of PFC_MCU sends a high level, the voltages of the primary side pins 1 and 2 of the optocoupler OT1 are high levels, and the secondary side pin 4 DC_SD of the optocoupler is a low level. The port DC_SD is connected to pin 1 of the control chip U2 of the primary DC-DC auxiliary power supply unit. According to the chip working principle, when pin 1 is at a low level, the chip stops sending drive signals, and the entire primary DC-DC auxiliary power supply unit stops working.

[0044] Step 3: After DC_AUX1 stops working, since DC-DC_MCU receives the startup instruction from the electric vehicle BMS and needs to maintain the working state all the time, the power supply of DC-DC_MCU is maintained by PFC_AUX2. The auxiliary system of the charging pile changes from the simultaneous operation of the primary PFC auxiliary power supply unit PFC_AUX1, the secondary PFC auxiliary power supply unit PFC_AUX2, and the primary DC-DC auxiliary power supply unit DC_AUX1 to the simultaneous operation of only the primary PFC auxiliary power supply unit PFC_AUX1 and the secondary PFC auxiliary power supply unit PFC_AUX2. The total standby power consumption of the entire charging pile is reduced from 18W to 8W.

[0045] Step 4: When DC-DC_MCU receives the startup instruction from the electric vehicle BMS, DC-DC_MCU sends a startup instruction to PFC_MCU through SCI communication. After PFC_MCU receives the startup instruction, the I / O port DC_SMPS_SD sends a low level, the voltages of the primary side pins 1 and 2 of the optocoupler OT1 are low levels, the pins 3 and 4 of OT1 are in a high-impedance state, and the chip U2 enters the normal working mode. The primary DC-DC auxiliary power supply unit DC_AUX1 resumes normal operation, the entire auxiliary power supply system works normally, and the charging pile resumes from the standby mode to the normal charging mode.

[0046] The level of the COMP pin of the power supply chip is controlled through the I / O of the single-chip microcomputer controller, and the opening and closing of the auxiliary power supply are controlled, so as to reduce the loss of the auxiliary power supply of the charging pile in standby. The small-power and large-power auxiliary power supplies are used for dual power supply. When the large auxiliary power supply stops working, the small-power auxiliary power supply can still maintain the power supply for controlling the micro single-chip microcomputer, realizing the switching of the auxiliary power supply between standby and working states at any time.

[0047] 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 examples shown and described here.

Claims

1. An auxiliary power supply for reducing standby power consumption, which is used for a charging pile. The charging pile includes an AC power input, the output end of the AC power input is connected to the input end of a PFC boost circuit, the output end of the PFC boost circuit is connected to the input end of a DC-DC circuit, and the output end of the DC-DC circuit is connected to a charging gun. It is characterized in that: The auxiliary power supply includes a first-stage PFC auxiliary power supply unit, a second-stage PFC auxiliary power supply unit, a first-stage DC-DC auxiliary power supply unit, a PFC chip control unit, and a DC-DC chip control unit. The input end of the first-stage PFC auxiliary power supply unit is connected to the output end of the PFC boost circuit. The output end of the first-stage PFC auxiliary power supply unit is respectively connected to the second-stage PFC auxiliary power supply unit, the first-stage DC-DC auxiliary power supply unit, and the PFC chip control unit. The second-stage PFC auxiliary power supply unit and the first-stage DC-DC auxiliary power supply unit are connected to the DC-DC chip control unit, and the DC-DC chip control unit is connected to the PFC chip control unit.

2. The auxiliary power supply for reducing standby power consumption according to claim 1, wherein: The output end of the PFC boost circuit is connected to the PFC_BUS port of the first-stage PFC auxiliary power supply unit. The PFC_BUS port is connected to one end of resistor R1, one end of capacitor C1, one end of resistor R2, and pin 1 of transformer T1. The other end of resistor R1 is connected to port VCC1 and pin 7 of control chip U1. The other end of capacitor C1 is connected to the other end of resistor R2 and the negative end of diode D1. Pin 2 of transformer T1 is connected to the positive end of diode D1 and the drain of MOS transistor Q1. The gate of MOS transistor Q1 is connected to one end of resistor R8. The other end of resistor R8 is connected to pin 6 of control chip U1. The source of MOS transistor Q1 is connected to port CS1 and one end of resistor R3. The other end of resistor R3 is connected to port PGND. Pin 1 of control chip U1 is connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of resistor R6. The other end of resistor R6 is connected to one end of resistor R4, one end of resistor R5, and pin 2 of control chip U1. The other end of resistor R4 is connected to port PFC_AUX1_OUT1. Pin 3 of control chip U1 is connected to port CS1. Pin 4 of control chip U1 is connected to one end of resistor R7 and one end of capacitor C3. The other end of resistor R7 is connected to port VREF1. The other end of capacitor C3 is connected to the other end of resistor R5 and port PGND. Pin 5 of control chip U1 is connected to port PGND. Pin 8 of control chip U1 is connected to port VREF1; Pin 3 of transformer T1 is connected to the positive end of diode D2. The negative end of diode D2 is connected to one end of capacitor C4 and port PFC_AUX1_OUT1. Pin 4 of transformer T1 is connected to the other end of capacitor C4 and port PGND. Port PFC_AUX1_OUT1 is connected to the PFC chip control unit; Pin 5 of transformer T1 is connected to the positive end of diode D3. The negative end of diode D3 is connected to one end of capacitor C5 and port PFC_AUX1_OUT2. Pin 6 of transformer T1 is connected to the other end of capacitor C5 and port AGND1. Port PFC_AUX1_OUT2 is connected to the first-stage DC-DC auxiliary power supply unit; Pin 7 of the transformer T1 is connected to the positive terminal of the diode D4. The negative terminal of the diode D4 is connected to one end of the capacitor C6 and the port PFC_AUX1_OUT3. Pin 8 of the transformer T1 is connected to the other end of the capacitor C6 and the port AGND2. The port PFC_AUX1_OUT3 is connected to the secondary PFC auxiliary power supply unit. Pin 9 of the transformer T1 is connected to the positive terminal of the diode D5. The negative terminal of the diode D5 is connected to one end of the capacitor C7 and the port PFC_DRIVER. Pin 10 of the transformer T1 is connected to the other end of the capacitor C7 and the port PGND. Pin 11 of the transformer T1 is connected to the positive terminal of the diode D6. The negative terminal of the diode D6 is connected to one end of the capacitor C8 and the port VCC1. Pin 12 of the transformer T1 is connected to the other end of the capacitor C8 and the port PGND.

3. The auxiliary power supply for reducing standby power consumption according to claim 2, characterized in that: The port PFC_DRIVER is connected to the PFC boost circuit and supplies power to the switching transistor and / or MCU of the PFC boost circuit.

4. The auxiliary power supply for reducing standby power consumption according to claim 2, characterized in that: The PFC chip control unit is connected to the port DC_SMPS_SD. The port DC_SMPS_SD is connected to one end of the resistor R9. The other end of the resistor R9 is connected to the anode of the optocoupler OT1. The cathode of the optocoupler OT1 is connected to the port PGND. The collector of the optocoupler OT1 is connected to the port VREF2. The emitter of the optocoupler OT1 is connected to the port DC_SD and one end of the resistor R10. The other end of the resistor R10 is connected to the port AGND1. The port DC_SD and the port VREF2 are connected to the primary DC-DC auxiliary power supply unit.

5. An auxiliary power supply for reducing standby power consumption according to claim 4, characterized in that: The primary DC-DC auxiliary power supply unit includes a resistor R9. One end of the resistor R9 is connected to port PFC_AUX1_OUT2, one end of a capacitor C9, one end of a resistor R10, and pin 1 of a transformer T2. The other end of the resistor R9 is connected to port VCC2 and pin 7 of a control chip U2. The other end of the capacitor C9 is connected to the other end of the resistor R10 and the negative end of a diode D7. Pin 2 of the transformer T2 is connected to the positive end of the diode D7 and the drain of a MOS transistor Q2. The gate of the MOS transistor Q2 is connected to one end of a resistor R13. The other end of the resistor R13 is connected to pin 6 of the control chip U2. The source of the MOS transistor Q2 is connected to port CS2 and one end of a resistor R14. The other end of the resistor R14 is connected to port AGND1. Pin 1 of the control chip U2 is connected to port DC_SD, one end of a resistor R11, and the collector of an optocoupler OT2. The other end of the resistor R11 is connected to port VREF2. Pin 3 of the control chip U2 is connected to port CS2. Pin 4 of the control chip U2 is connected to one end of a resistor R12 and one end of a capacitor C10. The other end of the resistor R12 is connected to port VREF2. The other end of the capacitor C10 is connected to the emitter of the optocoupler OT2 and port AGND1. Pin 5 of the control chip U2 is connected to port AGND1. Pin 8 of the control chip U2 is connected to port VREF2; Pin 3 of the transformer T2 is connected to the positive end of a diode D8. The negative end of the diode D8 is connected to one end of a capacitor C11, one end of a resistor R15, one end of a resistor R16, and port DC_AUX1_OUT1. Pin 4 of the transformer T2 is connected to the other end of the capacitor C11 and port DGND1. The other end of the resistor R15 is connected to the anode of the optocoupler OT2. The cathode of the optocoupler OT2 is connected to pin 3 of a voltage regulator diode Z1. The other end of the resistor R16 is connected to pin 1 of the voltage regulator diode Z1 and one end of a resistor R17. Pin 2 of the voltage regulator diode Z1 is connected to the other end of the resistor R17 and port DGND1. Port DC_AUX1_OUT1 is connected to a DC-DC chip control unit; Pin 5 of the transformer T2 is connected to the positive end of a diode D9. The negative end of the diode D9 is connected to one end of a capacitor C12 and port DC_DRIVER. Pin 6 of the transformer T2 is connected to the other end of the capacitor C12 and port DGND2; Pin 7 of the transformer T2 is connected to the positive end of a diode D10. The negative end of the diode D10 is connected to one end of a capacitor C13 and port VCC2. Pin 8 of the transformer T2 is connected to the other end of the capacitor C13 and port AGND1.

6. The auxiliary power supply for reducing standby power consumption according to claim 5, wherein: The port DC_DRIVER is connected to a DC-DC boost circuit and supplies power to the switching transistor and / or MCU of the DC-DC boost circuit.

7. An auxiliary power supply for reducing standby power consumption according to claim 2, characterized in that: The secondary PFC auxiliary power supply unit includes a resistor R26. One end of the resistor R26 is connected to port PFC_AUX1_OUT3, one end of a capacitor C14, one end of a resistor R18, and pin 1 of a transformer T3. The other end of the resistor R26 is connected to port VCC3 and pin 7 of a control chip U3. The other end of the capacitor C14 is connected to the other end of the resistor R18 and the negative end of a diode D11. Pin 2 of the transformer T3 is connected to the positive end of the diode D11 and the drain of a MOS transistor Q3. The gate of the MOS transistor Q3 is connected to one end of a resistor R21. The other end of the resistor R21 is connected to pin 6 of the control chip U3. The source of the MOS transistor Q3 is connected to port CS3 and one end of a resistor R22. The other end of the resistor R22 is connected to port AGND2. Pin 1 of the control chip U3 is connected to one end of a resistor R19 and the collector of an optocoupler OT3. The other end of the resistor R19 is connected to port VREF3. Pin 2 of the control chip U3 is connected to port AGND2. Pin 3 of the control chip U3 is connected to port CS3. Pin 4 of the control chip U3 is connected to one end of a resistor R20 and one end of a capacitor C15. The other end of the resistor R20 is connected to port VREF3. The other end of the capacitor C15 is connected to the emitter of the optocoupler OT3 and port AGND2. Pin 5 of the control chip U3 is connected to port AGND2. Pin 8 of the control chip U3 is connected to port VREF3; Pin 3 of the transformer T3 is connected to the positive end of a diode D12. The negative end of the diode D12 is connected to one end of a capacitor C16, one end of a resistor R23, one end of a resistor R24, and port PFC_AUX2_OUT1. Pin 4 of the transformer T3 is connected to the other end of the capacitor C16 and port DGND1. The other end of the resistor R23 is connected to the anode of the optocoupler OT3. The cathode of the optocoupler OT3 is connected to pin 3 of a voltage regulator diode Z2. The other end of the resistor R24 is connected to pin 1 of the voltage regulator diode Z2 and one end of a resistor R25. Pin 2 of the voltage regulator diode Z2 is connected to the other end of the resistor R25 and port DGND1. Port PFC_AUX2_OUT1 is connected to a DC-DC chip control unit; Pin 5 of the transformer T3 is connected to the positive end of a diode D13. The negative end of the diode D13 is connected to one end of a capacitor C17 and port VCC3. Pin 6 of the transformer T3 is connected to the other end of the capacitor C17 and port AGND1.

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