Charging module zero-power standby control circuit with pre-charge function

Abstract

The present application relates to a kind of zero-power standby control circuit of charging module with pre-charging function, including relay starting circuit, pre-charging starting circuit, shutdown switching circuit, pre-charging relay and magnetic latching relay.Circuit works, by charging controller provides +12V signal, charging module first closes pre-charging relay, then closes magnetic latching relay, realizes module wake-up.Module is stopped, and charging controller provides-12V signal, and charging module disconnects magnetic latching relay, at this time, the active power and the reactive power of charging module input are 0W.Effectively reduce the active power consumption and the reactive power consumption under the whole pile standby mode.After power factor is improved, operator can avoid the additional cost generated by reactive loss, by reducing implicit cost, prolonging equipment life, reducing carbon emissions, help operator to reduce cost and increase efficiency, the present application is applicable to various high-voltage fast charging or super charging pile and other facilities.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and specifically to a zero-power standby control circuit for a charging module with pre-charging function. Background Technology

[0002] With the increasing popularity of electric vehicles, charging power is gradually increasing to shorten charging time. To meet the growing demand for high-power charging of electric vehicles, the construction of supercharging stations is becoming increasingly widespread. At this point, the power consumption generated by supercharging piles in standby mode becomes a significant factor, which can be divided into active power and reactive power. Supercharging piles are generally composed of multiple charging modules operating in parallel. A traditional charging module has an active power of around 10W in standby mode, and its reactive power can reach as high as 1000W. The power consumption generated by supercharging piles in standby mode increases the operating costs of supercharging stations and prolongs the payback period. With the large-scale construction of supercharging stations, the reactive power loss generated during standby can even affect the power grid quality.

[0003] Existing methods involve adding an AC contactor inside the supercharging station to cut off the power supply to the charging module, thus achieving zero power consumption for the module. However, this method suffers from high cost, large space occupation within the station, and inflexible scheduling. Therefore, achieving zero standby power consumption for the charging module has significant practical implications. Summary of the Invention

[0004] In view of this, a zero-power standby control circuit with pre-charge function for a charging module is provided, which is energy-saving, emission-reducing, low-cost, and has efficient and stable circuit control.

[0005] A zero-power standby control circuit for a charging module with pre-charge function is used for standby pre-charge control of the charging module in a charging pile. It includes a relay start circuit, a pre-charge start circuit, a stop switching circuit, a pre-charge relay, and a magnetic latching relay.

[0006] The relay starting circuit includes a 25th diode D25, a 55th resistor R55, a 51st current-limiting resistor R51, a first filter circuit, and a 35th MOSFET Q35. The anode of the 25th diode D25 is connected to the initial high-level terminal RLYH. One end of the first filter circuit is connected to the cathode of the 25th diode D25, and the other end is connected to the initial low-level terminal RLYL. The 51st current-limiting resistor R51 is connected to the gate of the 35th MOSFET Q35. The 55th resistor R55 is connected in parallel between the input terminal of the 51st current-limiting resistor R51 and the source of the 35th MOSFET Q35. The parallel node of the 55th resistor R55 and the 51st current-limiting resistor R51 is connected to the cathode of the 25th diode D25. The drain of the 35th MOSFET Q35 is connected to the second high-level terminal RLYH2, the source of the 35th MOSFET Q35 is connected to the initial low-level terminal RLYL, and the cathode of the 25th diode D25 is connected to the second low-level terminal RLYL2.

[0007] The pre-charge relay is connected between the second high-level terminal RLYH2 and the second low-level terminal RLYL2. The pre-charge relay is used for switching control of the charging of the internal capacitor of the charging module. When the thirty-fifth MOS transistor Q35 is turned on, the pre-charge relay is triggered to close to charge the internal capacitor of the charging module.

[0008] The pre-charge startup circuit includes a 32nd diode D32, a 50th resistor R50, a 56th current-limiting resistor R56, a second filter circuit, and a 28th MOSFET Q28. The anode of the 32nd diode D32 is connected to the initial high-level terminal RLYH. One end of the second filter circuit is connected to the cathode of the 32nd diode D32, and the other end is connected to the initial low-level terminal RLYL. The 56th current-limiting resistor R56 is connected to the gate of the 28th MOSFET Q28. The 50th resistor R50 is connected in parallel between the input terminal of the 56th current-limiting resistor R56 and the source of the 28th MOSFET Q28. The parallel node of the 50th resistor R50 and the 56th current-limiting resistor R56 is connected to the cathode of the 32nd diode D32. The drain of the 28th MOSFET Q28 is connected to the first low-level terminal RLYL1, the source of the 28th MOSFET Q28 is connected to the initial low-level terminal RLYL, and the cathode of the 32nd diode D32 is connected to the first high-level terminal RLYH1.

[0009] The magnetic latching relay is connected between the first high-level terminal RLYH1 and the first low-level terminal RLYL1. The magnetic latching relay is used for the switching control of the pre-charging circuit. When the 28th MOS transistor Q28 is turned on, the magnetic latching relay is triggered to close so that the charging module enters the pre-charging environment.

[0010] The shutdown switching circuit includes a 35th diode D35, a 53rd resistor R53, a 54th current-limiting resistor R54, a third filter circuit, and a 34th MOSFET Q34. The anode of the 35th diode D35 is connected to the initial low-level terminal RLYL. One end of the third filter circuit is connected to the cathode of the 35th diode D35, and the other end is connected to the initial high-level terminal RLYH. The 54th current-limiting resistor R54 is connected to the gate of the 34th MOSFET Q34. The 53rd resistor R53 is connected in parallel with the input of the 54th current-limiting resistor R54 and the 34th MOSFET Q34. Between the sources of 4; the parallel node of the fifty-third resistor R53 and the fifty-fourth current-limiting resistor R54 is connected to the negative terminal of the thirty-fifth diode D35; the drain of the thirty-fourth MOSFET Q34 is connected to the first high-level terminal RLYH1, the source of the thirty-fourth MOSFET Q34 is connected to the initial high-level terminal RLYH, and the negative terminal of the thirty-fourth MOSFET Q34 is connected to the first low-level terminal RLYL1. When the charging module stops, the level of the initial low-level terminal RLYL is higher than that of the initial high-level terminal RLYH to turn on the thirty-fourth MOSFET Q34, thereby causing the magnetic latching relay to disconnect.

[0011] Preferably, the pre-charge start-up circuit further includes a fourth filter capacitor C84. One end of the fourth filter capacitor C84 is connected to the node between the fifty-sixth current-limiting resistor R56 and the gate of the twenty-eighth MOS transistor Q28, and the other end is connected to the initial low-level terminal RLYL. The pre-charge start-up circuit and the relay start-up circuit are synchronously connected to the initial high-level terminal RLYH to synchronously input the required voltage. The pre-charge start-up circuit performs delay control by adding the fourth filter capacitor C84. The delay control refers to the magnetic latching relay closing with a delay relative to the pre-charge relay.

[0012] Furthermore, the charging pile is connected to three-phase AC power, and there are three magnetic latching relays; each magnetic latching relay includes a magnetic latching winding and a magnetic latching switch, and each magnetic latching switch has a first standby contact and a second standby contact; the first standby contacts of the three magnetic latching relays are respectively connected to the three-phase lines; the second standby contacts of each magnetic latching relay are respectively connected to the charging module; the two ends of the magnetic latching winding of each magnetic latching relay are respectively connected to a first high-level terminal RLYH1 and a first low-level terminal RLYL1.

[0013] Furthermore, there are three precharge relays, each of which includes a precharge winding and a precharge switch. Each precharge switch has a first precharge contact and a second precharge contact. The first precharge contacts of the three precharge relays are respectively connected to the three-phase lines. The second precharge contacts of each precharge relay are respectively connected to the charging module. The two ends of the precharge winding of each precharge relay are respectively connected to the second low-level terminal RLYL2 and the second high-level terminal RLYH2. A tenth forward diode D10 is connected in front of the second low-level terminal RLYL2 before it is connected to the first precharge contact of each precharge relay.

[0014] Furthermore, each of the magnetic latching relays is connected in parallel with a corresponding precharge relay between one of the three-phase lines and the charging module; each of the precharge relays has a precharge resistance between its first precharge contact and each phase line.

[0015] Furthermore, a freewheeling diode is connected in parallel to each end of the magnetic latching winding in each magnetic latching relay; and a discharge protection diode is connected in parallel to each end of the precharge winding in each precharge relay.

[0016] Furthermore, the first filter circuit includes a first filter capacitor C85 and a first damping resistor R61 connected in parallel; the relay start circuit also includes a first bypass filter capacitor C75; one end of the first bypass filter capacitor C75 is connected to the negative terminal of the twenty-fifth diode D25, and the other end is connected to the first terminal of the fifty-fifth resistor R55 and the first terminal of the fifty-first current-limiting resistor R51; the second terminal of the fifty-fifth resistor R55 is connected to the initial low-level terminal RLYL, and the second terminal of the fifty-first current-limiting resistor R51 is connected to the gate of the thirty-fifth MOS transistor Q35.

[0017] Furthermore, the second filter circuit includes a second filter capacitor C69 and a second damping resistor R60 connected in parallel; the pre-charge start-up circuit also includes a second bypass filter capacitor C67; one end of the second bypass filter capacitor C67 is connected to the negative terminal of the thirty-second diode D32, and the other end is connected to the first terminal of the fiftieth resistor R50 and the first terminal of the fifty-sixth current-limiting resistor R56; the second terminal of the fiftieth resistor R50 is connected to the initial low-level terminal RLYL, and the second terminal of the fifty-sixth current-limiting resistor R56 is connected to the gate of the twenty-eighth MOS transistor Q28.

[0018] Specifically, the third filter circuit includes a third filter capacitor C74 and a third damping resistor R62 connected in parallel; the shutdown switching circuit also includes a third bypass filter capacitor C71; one end of the third bypass filter capacitor C71 is connected to the negative terminal of the thirty-fifth diode D35, and the other end is connected to the first terminal of the fifty-third resistor R53 and the first terminal of the fifty-fourth current-limiting resistor R54; the second terminal of the fifty-third resistor R53 is connected to the initial high-level terminal RLYH, and the second terminal of the fifty-fourth current-limiting resistor R54 is connected to the gate of the thirty-fourth MOSFET Q34; when the charging module is shut down and the input current is close to zero, the shutdown switching circuit inputs -12V to the initial high-level terminal RLYH and the initial low-level terminal RLYL, the thirty-fourth MOSFET Q34 is turned on, and -12V is applied between the first high-level terminal RLYH1 and the first low-level terminal RLYL1, and each of the magnetic latching relays is disconnected, so that both active power consumption and reactive power consumption are zero.

[0019] Furthermore, the initial high-level terminal RLYH and the initial low-level terminal RLYL are connected to a charging controller, which provides a +12V signal or a -12V signal between the initial high-level terminal RLYH and the initial low-level terminal RLYL.

[0020] In the zero-power standby control circuit of the charging module with pre-charge function described above, when a voltage such as +12V is applied, the relay start circuit turns on the 35th MOSFET Q35, triggering the pre-charge relay to close and connect the charging module to charge the internal capacitor. After a certain delay after the pre-charge relay closes, the magnetic latching relay closes, allowing the charging module to enter the pre-charge environment. After pre-charge is completed, the internal relay closes, and the module responds to the voltage request from the controller, enabling normal output. When the charging module stops and the input current approaches 0A, the charging controller applies -12V between the initial high-level terminal RLYH and the initial low-level terminal RLYL, driving the 34th MOSFET Q34 to turn on. -12V is applied between RLYH1 and RLYL1, and the magnetic latching relay opens, achieving zero active and reactive power consumption. Therefore, this application can achieve zero standby power consumption of the charging module, reduce the standby power consumption of the supercharging pile without adding an additional AC contactor, enable more flexible hibernation standby of the charging module inside the supercharging pile, make the supercharging pile with production and design more cost-effective and more competitive in the market, reduce the operating cost of the supercharging station, and reduce the impact on the power grid quality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the relay control section of the zero-power standby control circuit for a charging module with pre-charge function according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the relay start circuit of the zero-power standby control circuit of the charging module with pre-charge function according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the precharge start-up circuit of the zero-power standby control circuit of the charging module with precharge function according to an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the shutdown switching circuit of the zero-power standby control circuit of the charging module with pre-charge function according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram illustrating the principle of the zero-power standby control circuit for a charging module with pre-charging function applied to a charging pile, according to an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1 to 4 This diagram illustrates the circuit principles of a zero-power standby control circuit for a charging module with pre-charge function, provided by an embodiment of the present invention. The entire circuit is used for pre-charge control of the charging module in a charging pile, and includes a relay start circuit, a pre-charge start circuit, a stop switching circuit, a pre-charge relay, and a magnetic latching relay. This enables the charging module to have zero-power standby functionality, which, in conjunction with a charging controller, achieves zero-power standby. In practical applications, this circuit is equipped with a charging controller. When the charging controller provides a +12V signal, the charging module first closes the pre-charge relay, then closes the magnetic latching relay, waking the module up. After the module stops, the charging controller provides a -12V signal, and the charging module disconnects the magnetic latching relay. At this time, both the active and reactive power inputs of the charging module are 0W. This effectively reduces active and reactive power consumption in the standby mode of the entire charging pile. After improving the power factor, operators can avoid additional costs caused by reactive power loss, thereby reducing hidden costs, extending equipment lifespan, and reducing carbon emissions, helping operators reduce costs and increase efficiency. In the future, with the popularization of high-voltage fast charging technology and the intensification of market competition, zero standby design will become the standard feature of charging modules, reshaping the industry ecosystem.

[0028] Specifically, such as Figure 1 and Figure 2As shown, the relay starting circuit includes a 25th diode D25, a 55th resistor R55, a 51st current-limiting resistor R51, a first filter circuit, and a 35th MOSFET Q35. The anode of the 25th diode D25 is connected to the initial high-level terminal RLYH. One end of the first filter circuit is connected to the cathode of the 25th diode D25, and the other end is connected to the initial low-level terminal RLYL. The 51st current-limiting resistor R51 is connected to the gate of the 35th MOSFET Q35. The 55th resistor R55 is connected in parallel between the input terminal of the 51st current-limiting resistor R51 and the source of the 35th MOSFET Q35. The parallel node of the 55th resistor R55 and the 51st current-limiting resistor R51 is connected to the cathode of the 25th diode D25. The drain of the 35th MOSFET Q35 is connected to the second high-level terminal RLYH2, the source of the 35th MOSFET Q35 is connected to the initial low-level terminal RLYL, and the cathode of the 25th diode D25 is connected to the second low-level terminal RLYL2.

[0029] The pre-charge relay is connected between the second high-level terminal RLYH2 and the second low-level terminal RLYL2. The pre-charge relay is used for switching control of the charging of the internal capacitor of the charging module. When the thirty-fifth MOS transistor Q35 is turned on, the pre-charge relay is triggered to close to charge the internal capacitor of the charging module.

[0030] like Figure 1 and Figure 3 As shown, the pre-charge startup circuit includes a 32nd diode D32, a 50th resistor R50, a 56th current-limiting resistor R56, a second filter circuit, and a 28th MOSFET Q28. The anode of the 32nd diode D32 is connected to the initial high-level terminal RLYH. One end of the second filter circuit is connected to the cathode of the 32nd diode D32, and the other end is connected to the initial low-level terminal RLYL. The 56th current-limiting resistor R56 is connected to the gate of the 28th MOSFET Q28. The 50th resistor R50 is connected in parallel between the input terminal of the 56th current-limiting resistor R56 and the source of the 28th MOSFET Q28. The parallel node of the 50th resistor R50 and the 56th current-limiting resistor R56 is connected to the cathode of the 32nd diode D32. The drain of the 28th MOSFET Q28 is connected to the first low-level terminal RLYL1, the source of the 28th MOSFET Q28 is connected to the initial low-level terminal RLYL, and the cathode of the 32nd diode D32 is connected to the first high-level terminal RLYH1.

[0031] The magnetic latching relay is connected between the first high-level terminal RLYH1 and the first low-level terminal RLYL1. The magnetic latching relay is used for switching control of the pre-charging circuit. When the 28th MOS transistor Q28 is turned on, the magnetic latching relay is triggered to close so that the charging module enters the pre-charging environment.

[0032] The shutdown switching circuit includes a 35th diode D35, a 53rd resistor R53, a 54th current-limiting resistor R54, a third filter circuit, and a 34th MOSFET Q34. The anode of the 35th diode D35 is connected to the initial low-level terminal RLYL. One end of the third filter circuit is connected to the cathode of the 35th diode D35, and the other end is connected to the initial high-level terminal RLYH. The 54th current-limiting resistor R54 is connected to the gate of the 34th MOSFET Q34. The 53rd resistor R53 is connected in parallel with the input of the 54th current-limiting resistor R54 and the 34th MOSFET Q34. Between the sources of 4; the parallel node of the fifty-third resistor R53 and the fifty-fourth current-limiting resistor R54 is connected to the negative terminal of the thirty-fifth diode D35; the drain of the thirty-fourth MOSFET Q34 is connected to the first high-level terminal RLYH1, the source of the thirty-fourth MOSFET Q34 is connected to the initial high-level terminal RLYH, and the negative terminal of the thirty-fourth MOSFET Q34 is connected to the first low-level terminal RLYL1. When the charging module stops, the level of the initial low-level terminal RLYL is higher than that of the initial high-level terminal RLYH to turn on the thirty-fourth MOSFET Q34, thereby causing the magnetic latching relay to disconnect.

[0033] Specifically, the charging pile is connected to three-phase AC power, and there are three magnetic latching relays. For example, Figure 1The three magnetic latching relays shown are RLY1, RLY4, and RLY5. The three magnetic latching relays have essentially the same structure and function. Each magnetic latching relay includes a magnetic latching winding and a magnetic latching switch. The magnetic latching winding refers to the winding that maintains the switch in a closed state when there is a positive input at the first high-level terminal RLYH1 and the first low-level terminal RLYL1 (i.e., when the voltage at the first high-level terminal RLYH1 is higher than the voltage at the first low-level terminal RLYL1, such as a +12V range). In other words, once there is a positive input, the magnetic latching switch remains closed until a reverse input is applied (i.e., when the voltage at the first high-level terminal RLYH1 is lower than the voltage at the first low-level terminal RLYL1, such as a -12V range). As shown in the figure, the magnetic latching switch is preferably a single-pole double-throw switch. Each magnetic latching switch has a first standby contact and a second standby contact, which can also be referred to as the two terminals of the magnetic latching switch. The first standby contacts of the three magnetic latching relays are respectively connected to the three-phase lines; the second standby contacts of each magnetic latching relay are respectively connected to the charging module, that is, to the rear part of the charging circuit of the charging module. Figure 5 As shown, in phase A, the two standby contacts of the magnetic latching relay are connected between A0 and A00 of the charging module, respectively; in phase B, the two standby contacts of the magnetic latching relay are connected between B0 and B00 of the charging module, respectively; and in phase C, the two standby contacts of the magnetic latching relay are connected between C0 and C00 of the charging module, respectively. Of course, as... Figure 5 As shown, it can be understood that the latter part of the charging circuit is not limited to the structure shown in the diagram. Figure 5 This example only illustrates some relevant circuits, such as capacitors and inductors. In actual applications, other capacitors, inductors, and resistors are connected between each inductor L2-B, L2-C, L2-A and the connection terminals A1, B1, C1, which will not be elaborated here. The two ends of the magnetic latching winding in each magnetic latching relay are respectively connected to the first high-level terminal RLYH1 and the first low-level terminal RLYL1. Specifically, when there is a positive voltage or positive input between the first high-level terminal RLYH1 and the first low-level terminal RLYL1, for example, when the voltage between them is +12V, the magnetic latching switch is closed and remains in this state until a reverse voltage is applied across it.

[0034] Similarly, there are three precharge relays, for example, Figure 1The three precharge relays shown are precharge relays K1, K2, and K3. The three precharge relays have essentially the same structure and function. Each precharge relay includes a precharge winding K1-A (or K2-A, K3-A) and a precharge switch K1-B (or K2-B, K3-B). Each precharge switch K1-B, K2-B, and K3-B has a first precharge contact and a second precharge contact. The first precharge contacts of the three precharge relays K1, K2, and K3 are respectively connected to the three-phase lines. The second precharge contacts of each precharge relay are respectively connected to the charging module; that is, the two ends of the precharge switches K1-B, K2-B, and K3-B are respectively connected to the three-phase lines and the charging module. The two ends of the precharge winding in each of the precharge relays are respectively connected to the second low-level terminal RLYL2 and the second high-level terminal RLYH2; a tenth forward diode D10 is connected before the second low-level terminal RLYL2 connected to the first precharge contact of each of the precharge relays, that is, the precharge relay is triggered to close only when the level of the second low-level terminal RLYL2 is higher than that of the second high-level terminal RLYH2, which is equivalent to applying a negative voltage, for example, -12V, between the second high-level terminal RLYH2 and the second low-level terminal RLYL2 to trigger the closure of the precharge relay. Figure 2 As shown, when a high level, such as +12V, is applied to the initial high-level terminal RLYH, only a diode D25 passes between the initial high-level terminal RLYH and the second low-level terminal RLYL2. Therefore, the level of the second low-level terminal RLYL2 is close to +12V. At this time, after the 35th MOSFET Q35 is turned on, as... Figure 1 As shown, the level of the second low-level terminal RLYL2 is higher than that of the second high-level terminal RLYH2. After passing through the tenth forward diode D10, it connects to the pre-charge relays K1, K2, and K3, triggering the pre-charge relays K1, K2, and K3 to close. That is, the pre-charge switches K1-B, K2-B, and K3-B close, thereby connecting the three-phase AC power to the charging module. Figure 5 As shown, after connection, each X capacitor inside the charging module is charged, for example, Figure 5 The first capacitor C1, the second capacitor C2, and the third capacitor C3 are charged respectively.

[0035] Furthermore, each of the precharge relays has a precharge resistor between its first precharge contact and each phase line. For example, there is an eighty-ninth precharge resistor R89 ​​between phase A and precharge relay K1, a tenth precharge resistor R10 between phase B and precharge relay K2, and an eleventh precharge resistor R11 between phase C and precharge relay K3. Each precharge resistor R89, R10, and R11 serves a current-limiting function. Even further, a discharge protection diode is connected in parallel across the two ends of the precharge winding in each precharge relay. For example, Figure 1As shown, a sixty-seventh discharge protection diode D67 is connected in parallel across the two ends of the precharge winding K1-A of precharge relay K1; a sixteenth discharge protection diode D16 is connected in parallel across the two ends of the precharge winding K2-A of precharge relay K2; and a twenty-eighth discharge protection diode D28 is connected in parallel across the two ends of the precharge winding K3-A of precharge relay K3. Each discharge protection diode D67, D16, and D28 serves to protect its respective relay. Preferably, a freewheeling diode is also connected in parallel across the two ends of the magnetic latching winding in each magnetic latching relay. For example, Figure 1 As shown, a seventh freewheeling diode D7 is connected in parallel across the magnetic latching winding of magnetic latching relay RLY4; a sixth freewheeling diode D6 is connected in parallel across the magnetic latching winding of magnetic latching relay RLY1; and a third freewheeling diode D3 is connected in parallel across the magnetic latching winding of magnetic latching relay RLY5. Each freewheeling diode D7, D6, and D3 serves to protect its respective relay. Specifically, when the thirty-fifth MOSFET Q35 is turned off, it provides a discharge circuit for the reverse electromotive force of the inductor coil, preventing high voltage from damaging the drive components.

[0036] Furthermore, the first filtering circuit includes a first filtering capacitor C85 and a first damping resistor R61 connected in parallel. The first filtering capacitor C85 is used to filter out voltage fluctuations at the initial high-level terminal RLYH, stabilizing the circuit. The relay starting circuit also includes a first bypass filtering capacitor C75. One end of the first bypass filtering capacitor C75 is connected to the cathode of the twenty-fifth diode D25, and the other end is connected to the first terminal of the fifty-fifth resistor R55 and the first terminal of the fifty-first current-limiting resistor R51. The second terminal of the fifty-fifth resistor R55 is connected to the initial low-level terminal RLYL, and the second terminal of the fifty-first current-limiting resistor R51 is connected to the gate of the thirty-fifth MOSFET Q35. The first bypass filtering capacitor C75 filters the node voltage connected by the fifty-first current-limiting resistor R51 and the fifty-fifth resistor R55, filtering out high-frequency interference, making the voltage applied to the gate of the thirty-fifth MOSFET Q35 more stable, and ensuring that the MOSFET operates in a controllable state.

[0037] Furthermore, the second filter circuit includes a second filter capacitor C69 and a second damping resistor R60 connected in parallel; the pre-charge startup circuit also includes a second bypass filter capacitor C67. The functions of the second filter capacitor C69 and the second bypass filter capacitor C67 are similar to those of the first filter capacitor C85 and the first bypass filter capacitor C75, and their functions will not be described again here. One end of the second bypass filter capacitor C67 is connected to the negative terminal of the thirty-second diode D32, and the other end is connected to the first terminal of the fiftieth resistor R50 and the first terminal of the fifty-sixth current-limiting resistor R56. The second terminal of the fiftieth resistor R50 is connected to the initial low-level terminal RLYL, and the second terminal of the fifty-sixth current-limiting resistor R56 is connected to the gate of the twenty-eighth MOS transistor Q28.

[0038] Furthermore, the third filter circuit includes a third filter capacitor C74 and a third damping resistor R62 connected in parallel; the shutdown switching circuit also includes a third bypass filter capacitor C71; one end of the third bypass filter capacitor C71 is connected to the negative terminal of the thirty-fifth diode D35, and the other end is connected to the first terminal of the fifty-third resistor R53 and the first terminal of the fifty-fourth current-limiting resistor R54; the second terminal of the fifty-third resistor R53 is connected to the initial high-level terminal RLYH, and the second terminal of the fifty-fourth current-limiting resistor R54 is connected to the gate of the thirty-fourth MOSFET Q34; when the charging module is shut down and the input current is close to zero, the shutdown switching circuit inputs -12V to the initial high-level terminal RLYH and the initial low-level terminal RLYL, the thirty-fourth MOSFET Q34 is turned on, and -12V is applied between the first high-level terminal RLYH1 and the first low-level terminal RLYL1, and each of the magnetic latching relays is disconnected, so that both active power consumption and reactive power consumption are zero.

[0039] Preferably, as shown in Figure 3, the pre-charge startup circuit further includes a fourth filter capacitor C84. One end of the fourth filter capacitor C84 is connected to the node between the fifty-sixth current-limiting resistor R56 and the gate of the twenty-eighth MOSFET Q28, and the other end is connected to the initial low-level terminal RLYL. The pre-charge startup circuit and the relay startup circuit are synchronously connected to the initial high-level terminal RLYH to synchronously input the required voltage. The pre-charge startup circuit uses the fourth filter capacitor C84 for delay control, which means that the magnetic latching relay closes with a delay relative to the pre-charge relay. Therefore, when a +12V voltage is synchronously input to the pre-charge startup circuit and the relay startup circuit, the thirty-fifth MOSFET Q35 turns on first. In the pre-charge startup circuit, after the voltage on the fourth filter capacitor C84 reaches the conduction level of the twenty-eighth MOSFET Q28, each magnetic latching relay is triggered to close.

[0040] Furthermore, each of the magnetic latching relays is connected in parallel with a corresponding pre-charge relay between one of the three-phase lines and the charging module. The pre-charge relay's switch front end is connected in series with pre-charge resistors such as R89, R10, and R11. The magnetic latching relay closes only after a predetermined delay period following the pre-charge relay's closure. At this time, the magnetic latching relay is short-circuited, and the current will not pass through the pre-charge relay and pre-charge resistors R89, R10, and R11. The magnetic latching relay then keeps the switch closed, allowing the charging module to continue operating.

[0041] Therefore, during operation, when a voltage such as +12V is applied to the relay starting circuit, i.e., the voltage difference between the initial high-level terminal RLYH and the initial low-level terminal RLYL is +12V, the 35th MOSFET Q35 turns on, triggering the pre-charge relays K1, K2, and K3 to close, thus connecting the charging module to charge the internal X capacitor. After a certain delay after the pre-charge relays K1, K2, and K3 close, the magnetic latching relay closes next, putting the charging module into the pre-charge environment. After pre-charge is completed, the internal relays of the module close, and the module responds to the voltage request sent by the controller, enabling normal output. When the charging module stops and the input current approaches 0A, the charging controller applies -12V between the initial high-level terminal RLYH and the initial low-level terminal RLYL, driving the 34th MOSFET Q34 to turn on. -12V is applied between RLYH1 and RLYL1, and the magnetic latching relays RLY1, RLY4, and RLY5 open, achieving zero active and reactive power consumption. Therefore, this application can achieve zero standby power consumption of the charging module, reduce the standby power consumption of the supercharging pile without adding an additional AC contactor, enable more flexible hibernation standby of the charging module inside the supercharging pile, make the supercharging pile with production and design more cost-effective and more competitive in the market, reduce the operating cost of the supercharging station, and reduce the impact on the power grid quality.

[0042] It should be noted that the present invention is not limited to the above-described embodiments. Based on the inventive spirit of the present invention, those skilled in the art can make other changes, and these changes made in accordance with the inventive spirit of the present invention should be included within the scope of protection claimed by the present invention.

Claims

1. A zero-power standby control circuit with pre-charge function for a charging module standby pre-charge control of a charging pile, characterized in that, The relay starting circuit, the pre-charge starting circuit, the shutdown switching circuit, the pre-charge relay and the magnetic latching relay are included. The relay starting circuit includes the twenty-fifth diode D25, the fifty-fifth resistor R55, the fifty-first current-limiting resistor R51, a first filter circuit and a thirty-fifth MOS tube Q35; the positive electrode of the twenty-fifth diode D25 is connected to an initial high-level terminal RLYH, one end of the first filter circuit is connected to the negative electrode of the twenty-fifth diode D25, and the other end is connected to an initial low-level terminal RLYL; the fifty-first current-limiting resistor R51 is connected to the gate of the thirty-fifth MOS tube Q35; the fifty-fifth resistor R55 is connected in parallel between the input end of the fifty-first current-limiting resistor R51 and the source of the thirty-fifth MOS tube Q35; the parallel node of the fifty-fifth resistor R55 and the fifty-first current-limiting resistor R51 is connected to the negative electrode of the twenty-fifth diode D25; the drain of the thirty-fifth MOS tube Q35 is connected to a second high-level terminal RLYH2, the source of the thirty-fifth MOS tube Q35 is connected to the initial low-level terminal RLYL, and the negative electrode of the twenty-fifth diode D25 is connected to a second low-level terminal RLYL2; The pre-charge relay is connected between the second high-level terminal RLYH2 and the second low-level terminal RLYL2, and is used for switch control of charging of the internal capacitor of the charging module; when the thirty-fifth MOS tube Q35 is turned on, the closing of the pre-charge relay is triggered to charge the internal capacitor of the charging module; The pre-charge starting circuit includes a thirty-second diode D32, a fiftieth resistor R50, a fifty-sixth current-limiting resistor R56, a second filter circuit and a twenty-eighth MOS tube Q28; the positive electrode of the thirty-second diode D32 is connected to the initial high-level terminal RLYH, one end of the second filter circuit is connected to the negative electrode of the thirty-second diode D32, and the other end is connected to the initial low-level terminal RLYL; the fifty-sixth current-limiting resistor R56 is connected to the gate of the twenty-eighth MOS tube Q28; the fiftieth resistor R50 is connected in parallel between the input end of the fifty-sixth current-limiting resistor R56 and the source of the twenty-eighth MOS tube Q28; the parallel node of the fiftieth resistor R50 and the fifty-sixth current-limiting resistor R56 is connected to the negative electrode of the thirty-second diode D32; the drain of the twenty-eighth MOS tube Q28 is connected to a first low-level terminal RLYL1, the source of the twenty-eighth MOS tube Q28 is connected to the initial low-level terminal RLYL, and the negative electrode of the thirty-second diode D32 is connected to a first high-level terminal RLYH1; The magnetic latching relay is connected between the first high-level terminal RLYH1 and the first low-level terminal RLYL1, and is used for switch control of the pre-charge circuit; when the twenty-eighth MOS tube Q28 is turned on, the closing of the magnetic latching relay is triggered to make the charging module enter the pre-charge environment. The shutdown switching circuit comprises a thirty-fifth diode D35, a fifty-third resistor R53, a fifty-fourth current-limiting resistor R54, a third filter circuit and a thirty-fourth MOS tube Q34; a positive electrode of the thirty-fifth diode D35 is connected to the initial low-level end RLYL, one end of the third filter circuit is connected to a negative electrode of the thirty-fifth diode D35, and the other end of the third filter circuit is connected to the initial high-level end RLYH; the fifty-fourth current-limiting resistor R54 is connected to a gate of the thirty-fourth MOS tube Q34; the fifty-third resistor R53 is connected in parallel between an input end of the fifty-fourth current-limiting resistor R54 and a source of the thirty-fourth MOS tube Q34; a parallel node of the fifty-third resistor R53 and the fifty-fourth current-limiting resistor R54 is connected to the negative electrode of the thirty-fifth diode D35; a drain of the thirty-fourth MOS tube Q34 is connected to the first high-level end RLYH1, a source of the thirty-fourth MOS tube Q34 is connected to the initial high-level end RLYH, and a negative electrode of the thirty-fourth MOS tube Q34 is connected to the first low-level end RLYL1; when the charging module is shutdown, a level of the initial low-level end RLYL is higher than that of the initial high-level end RLYH to turn on the thirty-fourth MOS tube Q34 so as to make the magnetic latching relay be disconnected.

2. The zero power standby control circuit for a pre-charge enabled charge module of claim 1, wherein, The pre-charge starting circuit further comprises a fourth filter capacitor C84, one end of the fourth filter capacitor C84 is connected to a node between the fifty-sixth current-limiting resistor R56 and a gate of the twenty-eighth MOS tube Q28, and the other end of the fourth filter capacitor C84 is connected to the initial low-level end RLYL; the pre-charge starting circuit and the relay starting circuit are synchronously connected to the initial high-level end RLYH to synchronously input a required voltage, the pre-charge starting circuit controls a delay by increasing the fourth filter capacitor C84, and the delay control means that the magnetic latching relay is delayed to be closed relative to the pre-charge relay.

3. The zero standby power control circuit for a pre-charge enabled charging module of claim 1, wherein, The charging pile is connected to three-phase alternating current, and the magnetic latching relay has three; each of the magnetic latching relays comprises a magnetic latching winding and a magnetic latching switch, each of the magnetic latching switches has a first standby contact and a second standby contact; the first standby contacts of the three magnetic latching relays are respectively connected to three-phase lines; the second standby contacts of the three magnetic latching relays are respectively connected to the charging module; and two ends of the magnetic latching winding of each of the magnetic latching relays are respectively connected to the first high-level end RLYH1 and the first low-level end RLYL1.

4. The zero power standby control circuit for a pre-charge enabled charge module of claim 3, wherein, The pre-charge relays are three, each of the pre-charge relays comprises a pre-charge winding and a pre-charge switch, each of the pre-charge switches has a first pre-charge contact and a second pre-charge contact; the first pre-charge contacts of the three pre-charge relays are respectively connected to three-phase lines; the second pre-charge contacts in each of the pre-charge relays are respectively connected to a charging module; two ends of the pre-charge winding in each of the pre-charge relays are respectively connected to a second low-level terminal RLYL2 and a second high-level terminal RLYH2; the second low-level terminal RLYL2 is connected with a tenth forward diode D10 in front of the first pre-charge contact of each of the pre-charge relays.

5. The zero power standby control circuit for a pre-charge enabled charge module of claim 4, wherein, Each of the magnetic latching relays is connected in parallel with a corresponding one of the pre-charge relays between a line of the three-phase lines and the charging module; each of the pre-charge relays has a pre-charge resistor between the first pre-charge contact and the line.

6. The zero power standby control circuit for a pre-charge enabled charge module of claim 4, wherein, Two ends of the magnetic latching winding in each of the magnetic latching relays are respectively connected in parallel with a freewheeling diode; two ends of the pre-charge winding in each of the pre-charge relays are respectively connected in parallel with a discharge protection diode.

7. The zero standby power control circuit for a pre-charge enabled charging module of claim 1, wherein, The first filter circuit comprises a first filter capacitor C85 and a first damping resistor R61 connected in parallel; the relay starting circuit further comprises a first bypass filter capacitor C75; one end of the first bypass filter capacitor C75 is connected to a negative electrode of a twenty-fifth diode D25, the other end is connected to a first end of a fifty-fifth resistor R55 and a first end of a fifty-first current-limiting resistor R51; a second end of the fifty-fifth resistor R55 is connected to an initial low-level terminal RLYL, and a second end of the fifty-first current-limiting resistor R51 is connected to a gate of the thirty-fifth MOS tube Q35.

8. The zero standby power control circuit for a pre-charge enabled charging module of claim 1, wherein, The second filter circuit comprises a second filter capacitor C69 and a second damping resistor R60 connected in parallel; the pre-charge starting circuit further comprises a second bypass filter capacitor C67; one end of the second bypass filter capacitor C67 is connected to a negative electrode of a thirty-second diode D32, the other end is connected to a first end of a fiftieth resistor R50 and a first end of a fifty-sixth current-limiting resistor R56; a second end of the fiftieth resistor R50 is connected to the initial low-level terminal RLYL, and a second end of the fifty-sixth current-limiting resistor R56 is connected to a gate of the twenty-eighth MOS tube Q28.

9. The zero standby power control circuit for a pre-charge enabled charging module of claim 1, wherein, The third filter circuit comprises a third filter capacitor C74 and a third damping resistor R62 connected in parallel; the shutdown switching circuit further comprises a third bypass filter capacitor C71; one end of the third bypass filter capacitor C71 is connected to the negative electrode of a thirty-fifth diode D35, and the other end is connected to the first end of a fifty-third resistor R53 and the first end of a fifty-fourth current-limiting resistor R54; the second end of the fifty-third resistor R53 is connected to the initial high-level end RLYH, and the second end of the fifty-fourth current-limiting resistor R54 is connected to the gate of the thirty-fourth MOS tube Q34; when the charging module is shut down and the input current is close to zero, the initial high-level end RLYH and the initial low-level end RLYL input -12V, the thirty-fourth MOS tube Q34 is turned on, -12V is applied between the first high-level end RLYH1 and the first low-level end RLYL1, and each magnetic latching relay is disconnected, so that the active power consumption and the reactive power consumption are both zero.

10. The zero power standby control circuit for a pre-charge enabled charge module of claim 1, wherein, The initial high-level end RLYH and the initial low-level end RLYL are connected to a charging controller, and +12V or -12V signals are provided between the initial high-level end RLYH and the initial low-level end RLYL through the charging controller.

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