Relay soft start circuit and charging pile system

Abstract

A relay soft start circuit and a charging pile system comprise a first bypass switch module, a second bypass switch module, a third bypass switch module, a first main path switch module, a second main path switch module and a third main path switch module. Wherein the bypass switch module and the main switch module are connected to the same second pulse signal input end and first pulse signal input end so as to receive the same forward pulse signal and reverse pulse signal; the action time of the bypass switch module is different from that of the main path switch module, and the closing time difference of the bypass switch module and the main path switch module can be used for charging a post-stage safety capacitor, so that surge current caused by relatively large voltage difference between contacts when a main path switch device is closed is reduced, and the main path switch device is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the field of power supply modules, and more specifically, to a relay soft-start circuit and a charging pile system comprising the relay soft-start circuit. Background Art

[0002] After the charging pile stops charging, it will generally disconnect the power module of the charging pile from the power grid through a relay, thereby saving the power loss of the power module of the charging pile when it is in standby mode. The relay can be an AC contactor at the input end of the charging pile, or an input relay integrated in the power module (hereinafter referred to as a "bypass relay"). Before the next charging, the system closes the bypass relay through a control signal to complete the subsequent charging action.

[0003] Since there is a safety capacitor between the phase lines of the input EMI circuit of the charging pile power module, the voltage on the safety capacitor is zero before the bypass relay is closed. If the absolute value of the input AC voltage is large or even at the peak and valley at the moment the bypass relay is closed, there will be a large voltage difference with the safety capacitor, thereby generating a large surge current and damaging the contacts of the relay. If things go on like this for a long time, the life of the relay will be affected, and in serious cases, it will cause the relay to stick. Utility Model Content

[0004] The technical problem to be solved by the utility model is that, in view of the above-mentioned defects of the prior art, a relay soft-start circuit and a charging pile system including the relay soft-start circuit are provided, which uses two switch modules with different action times and utilizes the time difference of their closing to charge the subsequent safety capacitor, thereby reducing the surge current caused by the large voltage difference between the contacts when the main switch device is closed, thereby avoiding damage to the main switch device.

[0005] The technical solution adopted by the utility model to solve its technical problems is: construct a relay soft start circuit, including a first bypass switch module, a second bypass switch module, a third bypass switch module, a first main switch module, a second main switch module, a third main switch module and a capacitor module; the first end of the first bypass switch module is connected to the first end of the power grid, the second end is connected to the first end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the second bypass switch module is connected to the second end of the power grid, the second end is connected to the second end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the third bypass switch module is connected to the third end of the power grid, the second end is connected to the third end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the first main switch module is connected The first and second ends of the power grid are connected to the first end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the second main switch module is connected to the second end of the power grid, the second end is connected to the second end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the third main switch module is connected to the third end of the power grid, the second end is connected to the third end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the capacitor module is connected between the first end of the charging pile, the second end of the charging pile and the third end of the charging pile; there is a switching time difference between the first bypass switch module, the second bypass switch module and the third bypass switch module and the first main switch module, the second main switch module and the third main switch module.

[0006] In the relay soft start circuit described in the utility model, the bypass switch module includes a bypass relay, a first resistor and a first diode, the positive pole of the coil of the bypass relay is connected to the fourth end of the bypass switch module, the negative pole of the coil is connected to the anode of the first diode, the cathode of the first diode is connected to the third end of the bypass switch module, the moving contact of the bypass relay is connected to the first end of the bypass switch module, the first static contact is vacant, and the second static contact is connected to the second end of the bypass switch module via the first resistor.

[0007] In the relay soft start circuit described in the utility model, the bypass switch module includes a first switch tube, a second switch tube, a second resistor and a third resistor, the control ends of the first switch tube and the second switch tube are connected to the fourth end of the bypass switch module, the first end of the first switch tube is connected to the first end of the bypass switch module, and the second end is connected to the third end of the bypass switch module and the second end of the second switch tube, the first end of the second switch tube is connected to the second end of the bypass switch module via the second resistor, and the third resistor is connected between the third end and the fourth end of the bypass switch module.

[0008] In the relay soft start circuit described in the utility model, the switch tube includes a MOS tube, an IGBT tube or a triode; the control end of the MOS tube is the gate of the MOS tube, the first end is the drain of the MOS tube, and the second end is the source of the MOS tube; the control end of the IGBT tube is the gate of the IGBT tube, the first end is the drain of the IGBT tube, and the second end is the source of the IGBT tube; the control end of the triode is the base of the triode, the first end is the collector of the triode, and the second end is the emitter of the triode.

[0009] In the relay soft-start circuit described in the utility model, the bypass switch module includes a controlled switch, the moving contact of the controlled switch is connected to the first end and the third end of the bypass switch module, and the static contact of the controlled switch is connected to the second end and the fourth end of the bypass switch module; the relay soft-start circuit further includes a controller for controlling each controlled switch respectively, the first end of the controller is connected to the second pulse signal input end, and the second end is connected to the first pulse signal input end.

[0010] In the relay soft start circuit described in the utility model, the main switch module includes a main relay, the positive pole of the coil of the main relay is connected to the fourth end of the main switch module, the negative pole of the coil is connected to the third end of the main switch module, the moving contact of the main relay is connected to the second end of the main switch module, and the static contact is connected to the first end of the main switch module.

[0011] In the relay soft start circuit described in the utility model, the main switch module includes a first main relay and a second main relay; the positive pole of the coil of the first main relay is connected to the fourth end of the main switch module, and the negative pole of the coil is connected to the third end of the main switch module, and the moving contact of the first main relay is connected to the second end of the main switch module and the static contact is connected to the first end of the main switch module; the positive pole of the coil of the second main relay is connected to the fourth end of the main switch module, and the negative pole of the coil is connected to the third end of the main switch module, and the moving contact of the second main relay is connected to the second end of the main switch module and the static contact is connected to the first end of the main switch module.

[0012] In the relay soft start circuit described in the utility model, the capacitor module includes a first capacitor, a second capacitor and a third capacitor, the first capacitor is connected between the first end of the charging pile and the second end of the charging pile, the second capacitor is connected between the first end of the charging pile and the third end of the charging pile, and the third capacitor is connected between the first end of the charging pile and the third end of the charging pile.

[0013] In the relay soft-start circuit described in the utility model, the bypass relay is a magnetic latching relay, and the main relay is a normally open relay.

[0014] Another technical solution adopted by the utility model to solve its technical problem is: constructing a charging pile system, including a power module and the above-mentioned relay soft start circuit.

[0015] The relay soft start circuit and charging pile system implementing the utility model include a first bypass switch module, a second bypass switch module, a third bypass switch module, a first main switch module, a second main switch module, and a third main switch module, wherein the bypass switch module and the main switch module are connected to the same second pulse signal input terminal and the first pulse signal input terminal to receive the same forward pulse signal and reverse pulse signal; since the action time of the bypass switch module and the main switch module is different, the closing time difference can be used to charge the subsequent safety capacitor, reducing the surge current caused by the large voltage difference between the contacts when the main switch device is closed, thereby avoiding damage to the main switch device. Furthermore, the bypass switch module and the main switch module can adopt different structural designs, so that the circuit structure is flexible and suitable for different application scenarios. Furthermore, different types of relays can be used to construct the main and main switch modules, and a soft-start resistor can be designed after the bypass relay to construct a bypass soft-start circuit. The resistance value of the soft-start resistor can be further adjusted to further coordinate the action time difference of the two relays, so that after the main relay is closed, the voltage difference between the input voltage and the safety capacitor is further greatly reduced, the surge current is further reduced, and the relay is further closed with a small voltage difference. Furthermore, by setting a reverse diode, it can be ensured that the relay will not be opened by mistake. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 It is a principle block diagram of a first preferred embodiment of a relay soft-start circuit of the utility model;

[0018] Figure 2 It is a circuit diagram of a second embodiment of a relay soft-start circuit of the utility model;

[0019] Figure 3 It is a circuit diagram of a third embodiment of a relay soft-start circuit of the utility model;

[0020] Figure 4 1 is a circuit diagram of a fourth embodiment of a relay soft-start circuit of the present utility model;

[0021] Figure 5 It is a circuit diagram of a fifth embodiment of the relay soft-start circuit of the present utility model. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] Figure 1 1 is a principle block diagram of the first preferred embodiment of the relay soft start circuit of the utility model. Figure 1 As shown, the relay soft start circuit of the present utility model includes a first bypass switch module 110, a second bypass switch module 120, a third bypass switch module 130, a first main switch module 210, a second main switch module 220, a third main switch module 230 and a capacitor module 300. Figure 1 As shown, the first end of the first bypass switch module 110 is connected to the first end L1 of the power grid, the second end is connected to the first end PHASE 1 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the second bypass switch module 120 is connected to the second end L2 of the power grid, the second end is connected to the second end PHASE 2 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the third bypass switch module 130 is connected to the third end L3 of the power grid, the second end is connected to the third end PHASE 3 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the first main switch module 210 is connected to the first end L1 of the power grid, the second end is connected to the first end PHASE 1 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the second main switch module 220 is connected to the second end L2 of the power grid, the second end is connected to the second end PHASE 2 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the third main switch module 230 is connected to the third end L3 of the power grid, the second end is connected to the third end PHASE 3 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The capacitor module 300 is connected between the first end PHASE 1 of the charging pile, the second end PHASE 2 of the charging pile, and the third end PHASE 3 of the charging pile.

[0024] In the present invention, the first bypass switch module 110, the second bypass switch module 120 and the third bypass switch module 130 and the first main switch module 210, the second main switch module 220 and the third main switch module 230 use different switch device structures, so there is a switch time difference between them. For example, in a preferred embodiment of the present invention, the first bypass switch module 110, the second bypass switch module 120 and the third bypass switch module 130 respectively include normally open relays. The first main switch module 210, the second main switch module 220 and the third main switch module 230 may include magnetic latching relays. The forward or reverse pulse signal is input through the first pulse signal input terminal RELAY_H and the second pulse signal input terminal RELAY_L to control the closing or opening of the relay. The first bypass switch module 110, the second bypass switch module 120 and the third bypass switch module 130 use a common drive signal with the first main switch module 210, the second main switch module 220 and the third main switch module 230, but because of the different types of relays, their action times have a fixed difference. When a positive pulse signal is input through the first pulse signal input terminal RELAY_H and the second pulse signal input terminal RELAY_L, the first bypass switch module 110, the second bypass switch module 120 and the third bypass switch module 130 are closed in advance, thereby charging the charging module 300. In conjunction with the time difference between the bypass switch module and the main switch module, when the first main switch module 210, the second main switch module 220 and the third main switch module 230 are closed, the voltage difference between the input voltage and the capacitor module is greatly reduced, and the surge current is also significantly reduced.

[0025] The relay soft-start circuit implementing the utility model includes a first bypass switch module, a second bypass switch module, a third bypass switch module, a first main switch module, a second main switch module, and a third main switch module, wherein the bypass switch module and the main switch module are connected to the same second pulse signal input terminal and the first pulse signal input terminal to receive the same forward pulse signal and reverse pulse signal; since the action time of the bypass switch module and the main switch module is different, the closing time difference can be used to charge the subsequent safety capacitor, thereby reducing the surge current caused by the large voltage difference between the contacts when the main switch device is closed, thereby avoiding damage to the main switch device.

[0026] Figure 2 1 is a circuit diagram of the second embodiment of the relay soft start circuit of the utility model. Figure 1-2As shown, the relay soft start circuit of the utility model includes a first bypass switch module 110, a second bypass switch module 120, a third bypass switch module 130, a first main switch module 210, a second main switch module 220, a third main switch module 230 and a capacitor module 300. The first end of the first bypass switch module 110 is connected to the first end L1 of the power grid, the second end is connected to the first end PHASE 1 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the second bypass switch module 120 is connected to the second end L2 of the power grid, the second end is connected to the second end PHASE 2 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the third bypass switch module 130 is connected to the third end L3 of the power grid, the second end is connected to the third end PHASE 3 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the first main switch module 210 is connected to the first end L1 of the power grid, the second end is connected to the first end PHASE 1 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the second main switch module 220 is connected to the second end L2 of the power grid, the second end is connected to the second end PHASE 2 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The first end of the third main switch module 230 is connected to the third end L3 of the power grid, the second end is connected to the third end PHASE 3 of the charging pile, the third end is connected to the second pulse signal input end RELAY_L, and the fourth end is connected to the first pulse signal input end RELAY_H. The capacitor module 300 is connected between the first end PHASE 1 of the charging pile, the second end PHASE 2 of the charging pile, and the third end PHASE 3 of the charging pile.

[0027] exist Figure 2In the preferred embodiment shown, the first bypass switch module 110 includes a bypass relay REL1, a resistor R1 and a diode D1, the positive pole of the coil of the bypass relay REL1 is connected to the fourth end of the first bypass switch module 110 and the first pulse signal input end RELAY_H, the negative pole of the coil is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the third end of the first bypass switch module 110 and the second pulse signal input end RELAY_L, the moving contact of the bypass relay REL1 is connected to the first end of the first bypass switch module 110 and the first end L1 of the power grid, the first static contact is vacant, and the second static contact is connected to the second end of the first bypass switch module 110 and the first end PHASE 1 of the charging pile via the resistor R1. The first main switch module 210 includes a main relay K1, the positive pole of the coil of the main relay K1 is connected to the fourth end of the first main switch module 210 and the first pulse signal input end RELAY_H, the negative pole of the coil is connected to the third end of the first main switch module 210 and the second pulse signal input end RELAY_L, the moving contact of the main relay K1 is connected to the second end of the first main switch module 210 and the first end PHASE 1 of the charging pile, and the static contact is connected to the first end of the first main switch module 210 and the first end L1 of the power grid.

[0028] The second bypass switch module 120 includes a bypass relay REL2, a resistor R2 and a diode D2. The positive pole of the coil of the bypass relay REL2 is connected to the fourth end of the second bypass switch module 120 and the first pulse signal input end RELAY_H, the negative pole of the coil is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the third end of the second bypass switch module 120 and the second pulse signal input end RELAY_L, the moving contact of the bypass relay REL2 is connected to the first end of the second bypass switch module 120 and the second end L2 of the power grid, the first static contact is vacant, and the second static contact is connected to the second end of the second bypass switch module 120 and the second end PHASE 2 of the charging pile via the resistor R2. The second main switch module 220 includes a main relay K2, the positive pole of the coil of the main relay K2 is connected to the fourth end of the second main switch module 220 and the first pulse signal input end RELAY_H, the negative pole of the coil is connected to the third end of the second main switch module 220 and the second pulse signal input end RELAY_L, the moving contact of the main relay K2 is connected to the second end of the second main switch module 220 and the second end PHASE 2 of the charging pile, and the static contact is connected to the first end of the second main switch module 220 and the second end L2 of the power grid.

[0029] The third bypass switch module 130 includes a bypass relay REL3, a resistor R3 and a diode D3. The positive pole of the coil of the bypass relay REL3 is connected to the fourth end of the third bypass switch module 130 and the first pulse signal input end RELAY_H, the negative pole of the coil is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the third end of the third bypass switch module 130 and the second pulse signal input end RELAY_L, the moving contact of the bypass relay REL3 is connected to the first end of the third bypass switch module 130 and the third end L3 of the power grid, the first static contact is vacant, and the second static contact is connected to the second end of the third bypass switch module 130 and the third end PHASE 3 of the charging pile via the resistor R3. The third main switch module 230 includes a main relay K3, the positive pole of the coil of the main relay K3 is connected to the fourth end of the third main switch module 230 and the first pulse signal input end RELAY_H, the negative pole of the coil is connected to the third end of the third main switch module 230 and the second pulse signal input end RELAY_L, the moving contact of the main relay K3 is connected to the second end of the third main switch module 230 and the third end PHASE 3 of the charging pile, and the static contact is connected to the first end of the third main switch module 230 and the third end L3 of the power grid.

[0030] The capacitor module 300 includes a capacitor C2, a capacitor C3 and a capacitor C1, the capacitor C2 is connected between the first end PHASE 1 of the charging pile and the second end PHASE 2 of the charging pile, the capacitor C1 is connected between the first end PHASE 1 of the charging pile and the third end PHASE 3 of the charging pile, and the capacitor C3 is connected between the first end PHASE 1 of the charging pile and the third end PHASE 3 of the charging pile.

[0031] In a preferred embodiment of the utility model, the main relays K1, K2, and K3 can be magnetic latching relays, and the forward or reverse pulse signals are input through the first pulse signal input terminal RELAY_H and the second pulse signal input terminal RELAY_L to control the closing or opening of the relays K1, K2, and K3. The bypass relays REL1, REL2, and REL3 are bypass normally open relays, which respectively form a bypass soft start circuit with resistors R1, R2, and R3. The bypass normally open relays REL1, REL2, and REL3 use a common drive signal with the magnetic latching relays K1, K2, and K3. Because the types of relays are different, their action times have a fixed difference. When a forward pulse signal is input through the first pulse signal input terminal RELAY_H and the second pulse signal input terminal RELAY_L, the bypass normally open relays REL1, REL2, and REL3 are closed in advance, and the capacitors C1, C2, and C3 in the capacitor module 300 are charged through resistors R1, R2, and R3. By adjusting the resistance values ​​of resistors R1, R2, and R3, and coordinating the time difference of the two relays, when the main relays K1, K2, and K3 are closed, the voltage difference between the input voltage and the safety capacitor is greatly reduced, and the surge current is also significantly reduced, so that the relay can be closed with a small voltage difference. When the main relays K1, K2, and K3 are closed, all soft-start circuits are short-circuited, and when the forward drive signal is removed, the bypass normally open relays REL1, REL2, and REL3 are disconnected. When it is necessary to disconnect the input of the charging pile power module, a reverse pulse signal is input through the first pulse signal input terminal RELAY_H and the second pulse signal input terminal RELAY_L. Because the diodes D1, D2, and D3 are reversely cut off, the bypass normally open relays REL1, REL2, and REL3 continue to remain disconnected. The main relays K1, K2, and K3 are disconnected and maintained, and the module is completely powered off.

[0032] In the present invention, generally, the aforementioned beneficial effects can be obtained as long as the action time of the bypass normally open relays REL1, REL2, and REL3 can be ensured to be earlier than the action time of the main relays K1, K2, and K3, so the circuit is very simple and easy to control. Of course, in a further preferred embodiment of the present invention, those skilled in the art can further adjust the resistance values ​​of the resistors R1, R2, and R3 according to actual conditions and based on the common knowledge in the art, so as to coordinate the action time difference of the two relays, further reduce the voltage difference between the input voltage and the safety capacitor, and the surge current, so as to achieve better results. Those skilled in the art can implement the aforementioned technical solution based on the circuit of the present invention and the common knowledge in the art, and will not be repeated here.

[0033] The relay soft start circuit of the utility model includes a first bypass switch module, a second bypass switch module, a third bypass switch module, a first main switch module, a second main switch module, and a third main switch module, wherein the bypass switch module and the main switch module are connected to the same second pulse signal input terminal and the first pulse signal input terminal to receive the same forward pulse signal and reverse pulse signal; since the action time of the bypass switch module and the main switch module is different, the closing time difference can be used to charge the rear-stage safety capacitor, reduce the surge current caused by the large voltage difference between the contacts when the main switch device is closed, thereby avoiding damage to the main switch device. Furthermore, different types of relays can be used to construct the main and main switch modules, and a soft start resistor is designed after the bypass relay to construct a bypass soft start circuit, and the resistance value of the soft start resistor can be further adjusted to further coordinate the action time difference of the two relays, so that the voltage difference between the input voltage and the safety capacitor after the main relay is closed is further greatly reduced, the surge current is further reduced, and the small voltage difference closure of the relay is further achieved. Furthermore, by providing a reverse diode, it can be ensured that the relay will not be turned on by mistake.

[0034] In other preferred embodiments of the present invention, different designs and structures may be used for the first bypass switch module, the second bypass switch module, the third bypass switch module, the first main switch module, the second main switch module, and the third main switch module, such as Figure 3-5 shown. Figure 3-5 The principle of the embodiment shown is Figure 2 Similar, I will not repeat it here.

[0035] Figure 3 1 is a circuit diagram of the third embodiment of the relay soft start circuit of the utility model. Figure 3 In the preferred embodiment shown, it is an internal input circuit of the charging pile power module, wherein the first end L1 of the power grid, the second end L2 of the power grid and the third end L1 of the power grid are connected to the input fuse; the first end PHASE1 of the charging pile, the second end PHASE2 of the charging pile and the third end PHASE3 of the charging pile are connected to the post-stage EMI filter circuit. Figure 3 In the preferred embodiment shown, it is Figure 2 The main difference of the embodiment shown is that the main switch module includes two main relays. Figure 3 As shown, the first main switch module 210 includes a main relay K1 and a main relay K11 connected in parallel. The second main switch module 220 includes a main relay K2 and a main relay K22 connected in parallel. The third main switch module 230 includes a main relay K3 and a main relay K33 connected in parallel.

[0036] like Figure 3As shown, the positive pole of the coil of the main relay K1 is connected to the first pulse signal input terminal RELAY_H, the negative pole of the coil is connected to the second pulse signal input terminal RELAY_L, the moving contact of the main relay K1 is connected to the first end PHASE 1 of the charging pile, and the static contact is connected to the first end L1 of the power grid; the positive pole of the coil of the main relay K11 is connected to the first pulse signal input terminal RELAY_H, the negative pole of the coil is connected to the second pulse signal input terminal RELAY_L, the moving contact of the main relay K11 is connected to the first end PHASE 1 of the charging pile, and the static contact is connected to the first end L1 of the power grid. The positive pole of the coil of the main relay K2 is connected to the first pulse signal input terminal RELAY_H, and the negative pole of the coil is connected to the second pulse signal input terminal RELAY_L. The moving contact of the main relay K2 is connected to the second terminal PHASE2 of the charging pile, and the static contact is connected to the second terminal L2 of the power grid; the positive pole of the coil of the main relay K22 is connected to the first pulse signal input terminal RELAY_H, and the negative pole of the coil is connected to the second pulse signal input terminal RELAY_L. The moving contact of the main relay K22 is connected to the second terminal PHASE 2 of the charging pile, and the static contact is connected to the second terminal L2 of the power grid. The positive pole of the coil of the main relay K3 is connected to the first pulse signal input terminal RELAY_H, and the negative pole of the coil is connected to the second pulse signal input terminal RELAY_L. The moving contact of the main relay K3 is connected to the first terminal PHASE 1 of the charging pile, and the static contact is connected to the third terminal L3 of the power grid; the positive pole of the coil of the main relay K33 is connected to the first pulse signal input terminal RELAY_H, and the negative pole of the coil is connected to the second pulse signal input terminal RELAY_L. The moving contact of the main relay K33 is connected to the third terminal PHASE 3 of the charging pile, and the static contact is connected to the third terminal L3 of the power grid.

[0037] Figure 4 1 is a circuit diagram of the fourth embodiment of the relay soft start circuit of the utility model. Figure 4 In the preferred embodiment shown, it is Figure 2 The main difference between the illustrated embodiments is that the first bypass switch module 110 , the second bypass switch module 120 , and the third bypass switch module 130 use switch tubes, such as MOS tubes, IGBT tubes, or triodes to implement switching.

[0038] like Figure 4As shown, the first bypass switch module 110 includes a switch tube Q1, a switch tube Q11, a resistor R1, and a resistor R11. The control ends of the switch tube Q1 and the switch tube Q11 are connected to the fourth end of the first bypass switch module 110 and the first pulse signal input end RELAY_H. The first end of the switch tube Q1 is connected to the first end of the first bypass switch module 110 and the first end L1 of the power grid, and the second end is connected to the third end of the first bypass switch module 110, the second pulse signal input end RELAY_L and the second end of the switch tube Q11. The first end of the switch tube Q11 is connected to the second end of the first bypass switch module 110 and the first end PHASE 1 of the charging pile via the resistor R1. The resistor R11 is connected between the third end and the fourth end of the first bypass switch module 110, that is, between the second end and the control end of the switch tubes Q1 and Q11.

[0039] The second bypass switch module 120 includes a switch tube Q2, a switch tube Q22, a resistor R2, and a resistor R22. The control end of the switch tube Q2 and the switch tube Q22 is connected to the fourth end of the second bypass switch module 120 and the first pulse signal input end RELAY_H. The first end of the switch tube Q2 is connected to the first end of the second bypass switch module 120 and the second end L2 of the power grid, and the second end is connected to the third end of the second bypass switch module 120, the second pulse signal input end RELAY_L and the second end of the switch tube Q22. The first end of the switch tube Q22 is connected to the second end of the second bypass switch module 120 and the second end PHASE 2 of the charging pile via the resistor R2. The resistor R22 is connected between the third end and the fourth end of the second bypass switch module 120, that is, between the second end and the control end of the switch tubes Q2 and Q22.

[0040] The third bypass switch module 130 includes a switch tube Q3, a switch tube Q33, a resistor R3, and a resistor R33. The control end of the switch tube Q3 and the switch tube Q33 is connected to the fourth end of the third bypass switch module 130 and the first pulse signal input end RELAY_H. The first end of the switch tube Q3 is connected to the first end of the third bypass switch module 130 and the third end L3 of the power grid, and the second end is connected to the third end of the third bypass switch module 130, the second pulse signal input end RELAY_L and the second end of the switch tube Q33. The first end of the switch tube Q33 is connected to the second end of the third bypass switch module 130 and the third end PHASE 3 of the charging pile through the resistor R3. The resistor R33 is connected between the third end and the fourth end of the third bypass switch module 130, that is, between the second end and the control end of the switch tubes Q3 and Q33.

[0041] In a preferred embodiment of the utility model, the switch tubes Q1-Q3, Q11-Q33 may include MOS tubes, IGBT tubes or triodes; the control end of the MOS tube is the gate of the MOS tube, the first end is the drain of the MOS tube, and the second end is the source of the MOS tube; the control end of the IGBT tube is the gate of the IGBT tube, the first end is the drain of the IGBT tube, and the second end is the source of the IGBT tube; the control end of the triode is the base of the triode, the first end is the collector of the triode, and the second end is the emitter of the triode.

[0042] Figure 5 1 is a circuit diagram of the fifth embodiment of the relay soft start circuit of the utility model. Figure 4 In the preferred embodiment shown, it is Figure 2 The main difference of the embodiment shown is that the first bypass switch module 110, the second bypass switch module 120, and the third bypass switch module 130 use controlled switches K1-K3 to implement switching. Figure 5 As shown, the moving contacts of the controlled switches K1-K3 are respectively connected to the first end (i.e., the first end L1-third end L3 of the power grid) and the third end (i.e., the second pulse signal input end RELAY_L) of each bypass switch module, and the static contacts of the controlled switches K1-K3 are connected to the second end (i.e., the first end PHASE 1-third end PHASE 3 of the charging pile) and the fourth end (i.e., the first pulse signal input end RELAY_H) of each bypass switch module. The relay soft start circuit further includes a controller for controlling each controlled switch K1-K3, the first end of the controller is connected to the second pulse signal input end RELAY_L, and the second end is connected to the first pulse signal input end RELAY_H. In a preferred embodiment of the utility model, the controller can adopt any suitable controller chip, such as a delay device, so as to control the delayed opening of the controlled switches K1-K3.

[0043] A further preferred embodiment of the utility model further includes a charging pile system, including a power module and any one of the above-mentioned relay soft-start circuits. Based on the teachings of the utility model, those skilled in the art can apply the relay soft-start circuit of the utility model to any known charging pile system, thereby realizing the charging pile system of the utility model, and no further description is given.

[0044] Although the present invention is described through specific embodiments, it should be understood by those skilled in the art that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation methods that fall within the scope of the claims of the present invention.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A relay soft start circuit, characterized in that: It includes a first bypass switch module, a second bypass switch module, a third bypass switch module, a first main switch module, a second main switch module, a third main switch module and a capacitor module; the first end of the first bypass switch module is connected to the first end of the power grid, the second end is connected to the first end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the second bypass switch module is connected to the second end of the power grid, the second end is connected to the second end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the third bypass switch module is connected to the third end of the power grid, the second end is connected to the third end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the first main switch module is connected to the first end of the power grid, the second end is connected to the charging pile The first end and the third end of the pile are connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the second main switch module is connected to the second end of the power grid, the second end is connected to the second end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the first end of the third main switch module is connected to the third end of the power grid, the second end is connected to the third end of the charging pile, the third end is connected to the second pulse signal input end, and the fourth end is connected to the first pulse signal input end; the capacitor module is connected between the first end of the charging pile, the second end of the charging pile and the third end of the charging pile; there is a switching time difference between the first bypass switch module, the second bypass switch module and the third bypass switch module and the first main switch module, the second main switch module and the third main switch module.

2. The relay soft start circuit according to claim 1, characterized in that: The bypass switch module includes a bypass relay, a first resistor and a first diode. The positive pole of the coil of the bypass relay is connected to the fourth end of the bypass switch module, the negative pole of the coil is connected to the anode of the first diode, the cathode of the first diode is connected to the third end of the bypass switch module, the moving contact of the bypass relay is connected to the first end of the bypass switch module, the first static contact is vacant, and the second static contact is connected to the second end of the bypass switch module via the first resistor.

3. The relay soft start circuit according to claim 1, characterized in that: The bypass switch module includes a first switch tube, a second switch tube, a second resistor and a third resistor. The control ends of the first switch tube and the second switch tube are connected to the fourth end of the bypass switch module. The first end of the first switch tube is connected to the first end of the bypass switch module, and the second end is connected to the third end of the bypass switch module and the second end of the second switch tube. The first end of the second switch tube is connected to the second end of the bypass switch module via the second resistor. The third resistor is connected between the third end and the fourth end of the bypass switch module.

4. The relay soft start circuit according to claim 3, characterized in that: The switch tube includes a MOS tube, an IGBT tube or a triode; the control end of the MOS tube is the gate of the MOS tube, the first end is the drain of the MOS tube, and the second end is the source of the MOS tube; the control end of the IGBT tube is the gate of the IGBT tube, the first end is the drain of the IGBT tube, and the second end is the source of the IGBT tube; the control end of the triode is the base of the triode, the first end is the collector of the triode, and the second end is the emitter of the triode.

5. The relay soft-start circuit according to claim 1, characterized in that: The bypass switch module comprises a controlled switch, a moving contact of the controlled switch is connected to a first end and a third end of the bypass switch module, and a static contact of the controlled switch is connected to a second end and a fourth end of the bypass switch module; The relay soft start circuit further includes a controller for controlling each controlled switch, wherein a first end of the controller is connected to the second pulse signal input end, and a second end of the controller is connected to the first pulse signal input end.

6. The relay soft-start circuit according to any one of claims 1 to 5, characterized in that: The main switch module includes a main relay, the positive pole of the coil of the main relay is connected to the fourth end of the main switch module, the negative pole of the coil is connected to the third end of the main switch module, the moving contact of the main relay is connected to the second end of the main switch module, and the static contact is connected to the first end of the main switch module.

7. The relay soft-start circuit according to any one of claims 1 to 5, characterized in that: The main switch module includes a first main relay and a second main relay; the positive pole of the coil of the first main relay is connected to the fourth end of the main switch module, and the negative pole of the coil is connected to the third end of the main switch module, and the moving contact of the first main relay is connected to the second end of the main switch module, and the static contact is connected to the first end of the main switch module; the positive pole of the coil of the second main relay is connected to the fourth end of the main switch module, and the negative pole of the coil is connected to the third end of the main switch module, and the moving contact of the second main relay is connected to the second end of the main switch module, and the static contact is connected to the first end of the main switch module.

8. The relay soft-start circuit according to any one of claims 1 to 5, characterized in that: The capacitor module includes a first capacitor, a second capacitor and a third capacitor, the first capacitor is connected between the first end of the charging pile and the second end of the charging pile, the second capacitor is connected between the first end of the charging pile and the third end of the charging pile, and the third capacitor is connected between the first end of the charging pile and the third end of the charging pile.

9. The relay soft-start circuit according to claim 6, characterized in that: The bypass relay of the bypass switch module is a magnetic latching relay, and the main relay is a normally open relay.

10. A charging pile system, characterized in that: It comprises a power supply module and a relay soft-start circuit according to any one of claims 1 to 9.

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