Charging pile dual-power switching circuit

Abstract

The utility model discloses a dual-power switching circuit of a charging pile, and belongs to the technical field of charging piles. According to the utility model, five relays are connected among the main power supply, the standby power supply and the charging controller, two relays are arranged in the charging controller, and the purpose of automatically switching power supplies is achieved through the ingenious connection of each relay coil and a normally open and normally closed contact. In addition, after the charging controller receives a remote instruction, power supply switching and system restarting are achieved by controlling power-on and power-off of a relay coil in the charging controller. The charging controller and the communication main control module serve as loads of the main power supply and the standby power supply, an independent power supply is not needed, and the problems that in the prior art, an ATS needs an independent power supply, and the independent power supply is not available, and power supply switching faults are possibly caused are solved. The charging pile dual power supply switching circuit provided by the scheme is simple and reliable in design, low in cost, wide in application range, high in power supply stability, and capable of automatically or remotely switching power supplies.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, in particular to a dual-power switching circuit for a charging pile. Background Technique

[0002] An ATS (Automatic Transfer Switch) is a device used for automatically switching between two power sources. It is mainly used to ensure that critical loads can obtain power from the backup power source without interruption when the main power fails. ATSs are usually installed in places that require highly reliable power supply, such as hospitals, data centers, communication centers, airports, and other important infrastructures.

[0003] The ATS can achieve fast switching between two power sources, but its disadvantages are also very obvious: the control circuit of the ATS requires an independent power source that is energized for a long time, resulting in large power consumption, and if the secondary circuit power supply is disconnected, the ATS will not be able to work properly.

[0004] The ATS in the charging pile is of great significance for ensuring the continuity and reliability of the electric vehicle charging process. If the ATS cannot work properly due to the disconnection of the secondary circuit power supply, the continuity and reliability of the charging process will be affected, affecting the user charging experience, and even causing serious economic losses to the charging pile operator and the vehicle owner. Content of the Utility Model

[0005] Aiming at the above problems in the background technique, the utility model provides a dual-power switching circuit for a charging pile.

[0006] The dual-power switching circuit for a charging pile provided by the utility model includes a main power source, a backup power source, a charging controller, a communication main control module, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay;

[0007] After the positive output terminal of the main power source is connected to the first normally open contact of the fourth relay, it is respectively connected to the fourth end and the second end of the first wiring terminal of the charging controller through the coil of the second relay and the coil of the third relay; after the positive output terminal of the main power source is connected to the first normally open contact of the fourth relay, it is also connected to the power positive input terminals of the charging controller and the communication main control module;

[0008] The positive output terminal of the main power source is also sequentially connected to the negative output terminal of the main power source through the normally open contact of the first relay and the coil of the fourth relay; the normally closed contact of the second relay is connected in series with the coil of the first relay and is connected in parallel with the branch where the normally open contact of the first relay and the coil of the fourth relay are located;

[0009] After the negative output terminal of the main power supply is connected to the second normally open contact of the fourth relay, it is respectively connected to the first end and the third end of the first terminal of the charging controller; after the negative output terminal of the main power supply is connected to the second normally open contact of the fourth relay, it is also connected to the negative power input terminals of the charging controller and the communication main control module;

[0010] After the positive output terminal of the standby power supply is connected to the first normally open contact of the fifth relay, it is respectively connected to the fourth end and the second end of the first terminal of the charging controller through the coil of the second relay and the coil of the third relay; after the positive output terminal of the standby power supply is connected to the first normally open contact of the fifth relay, it is also connected to the positive power input terminals of the charging controller and the communication main control module;

[0011] The positive output terminal of the standby power supply is also sequentially connected to the negative output terminal of the standby power supply through the normally closed contact of the third relay, the normally closed contact of the first relay, and the coil of the fifth relay;

[0012] After the negative output terminal of the standby power supply is connected to the second normally open contact of the fifth relay, it is respectively connected to the first end and the third end of the first terminal of the charging controller; after the negative output terminal of the standby power supply is connected to the second normally open contact of the fifth relay, it is also connected to the negative power input terminals of the charging controller and the communication main control module;

[0013] The communication main control module is used to receive a remote power supply switching instruction and send it to the charging controller;

[0014] The coils of the sixth relay and the seventh relay are arranged in the charging controller, and a normally open contact of the sixth relay is connected between the third end and the fourth end of the terminal of the charging controller, and a normally open contact of the seventh relay is connected between the first end and the second end of the terminal of the charging controller;

[0015] The charging controller is electrically connected to the coils of the sixth relay and the seventh relay, and the charging controller controls the on-off of the coils of the sixth relay and the seventh relay according to the remote power supply switching instruction to perform dual power supply switching.

[0016] Preferably, both the main power supply and the standby power supply are switching power supplies.

[0017] Preferably, the circuit further includes a first AC incoming line protection circuit breaker and a second AC incoming line protection circuit breaker. The first AC incoming line protection circuit breaker is connected between the output terminal of the AC power supply and the input terminal of the main power supply, and the second AC incoming line protection circuit breaker is connected between the output terminal of the AC power supply and the input terminal of the standby power supply.

[0018] Preferably, the circuit further includes a first DC output protection fuse and a second DC output protection fuse. The first DC output protection fuse is connected to the output terminal of the main power supply, and the second DC output protection fuse is connected to the output terminal of the backup power supply.

[0019] Preferably, the charging controller and the communication main control module are connected through a CAN bus.

[0020] Preferably, the charging controller further includes a switching device for controlling the on / off of the coils of the sixth relay and the seventh relay.

[0021] Preferably, other electrical equipment is also connected to the output terminals of the main power supply and the backup power supply.

[0022] Preferably, the communication main control module includes a SIM card slot, a 4G module, and a 4G antenna.

[0023] The utility model has the following beneficial effects: In the utility model, a first relay, a second relay, a third relay, a fourth relay, and a fifth relay are connected between the main power supply, the backup power supply, and the charging controller. A sixth relay and a seventh relay are arranged in the charging controller. Through the ingenious connection of the coils of each relay and the normally open and normally closed contacts of the relay, the purpose of automatically switching the power supply is achieved. In addition, after receiving the remote power supply switching instruction forwarded by the communication main control module, the charging controller realizes power supply switching and system restart by controlling the energization and de-energization of the coils of the sixth relay and the seventh relay. The charging controller and the communication main control module simultaneously serve as loads of the main power supply and the backup power supply, without the need for an independent power supply, solving the problem in the prior art that the ATS requires an independent power supply, and the power supply switching failure may occur when the independent power supply is unavailable. In summary, the dual-power switching circuit of the charging pile provided by this solution is simple and reliable in design, low in cost, wide in application range, has high power supply stability, can automatically or remotely switch the power supply, reduces the on-site maintenance and after-sales costs of the charging pile, and improves the use efficiency of customers. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the dual-power switching circuit of the charging pile provided by the embodiment of the utility model. Detailed Embodiments

[0025] In order to have a clearer understanding of the technical features, objectives, and effects of the utility model, the specific embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0026] The main function of the switching power supply in the charging pile is to convert the alternating current (AC) provided by the power grid into direct current (DC) suitable for charging the electric vehicle battery, and to provide a stable DC power supply for the auxiliary system inside the charging pile. To ensure the continuity and reliability of the electric vehicle charging process, usually two sets of switching power supplies are set inside the charging pile, serving as the main power supply and the backup power supply respectively, and the automatic switching of the dual power supplies is realized through the ATS. The ATS can achieve fast switching between the two power supplies, but its disadvantages are also very obvious: the control circuit of the ATS requires an independent power supply that is energized for a long time. If the power supply of the secondary circuit is disconnected, the ATS will not work properly.

[0027] The dual-power switching circuit of the charging pile provided by the solution of the present utility model is used to solve the problem in the prior art that the control circuit of the ATS requires an independent power supply, and the ATS cannot work properly if the power supply of the secondary circuit is disconnected.

[0028] As Figure 1 shown, the embodiment of the present utility model provides a dual-power switching circuit of a charging pile. The circuit includes a main power supply, a backup power supply, a charging controller, a communication main control module, a first relay KA1, a second relay KA2, a third relay KA3, a fourth relay KA11, a fifth relay KA22, a sixth relay KA33, and a seventh relay KA44.

[0029] In the embodiment of the present utility model, both the main power supply and the backup power supply are switching power supplies, and the output voltage is 12V.

[0030] The output terminals of the main power supply and the backup power supply are also connected to other electrical equipment. The other electrical equipment includes a battery management system, an indicator light, and a display screen.

[0031] After the positive output terminal of the main power supply is connected to the first normally open contact of the fourth relay KA11, it is respectively connected to the fourth terminal and the second terminal of the first wiring terminal J8 of the charging controller through the coil of the second relay KA2 and the coil of the third relay KA3; after the positive output terminal of the main power supply is connected to the first normally open contact of the fourth relay KA11, it is also connected to the power positive input terminals of the charging controller and the communication main control module.

[0032] The positive output terminal of the main power supply is also sequentially connected to the negative output terminal of the main power supply through the normally open contact of the first relay KA1 and the coil of the fourth relay KA11; the normally closed contact of the second relay KA2 is connected in series with the coil of the first relay KA1 and is connected in parallel with the branch where the normally open contact of the first relay KA1 and the coil of the fourth relay KA11 are located.

[0033] After the negative output terminal of the main power supply is connected to the second normally open contact of the fourth relay KA11, it is respectively connected to the first end and the third end of the first wiring terminal J8 of the charging controller; after the negative output terminal of the main power supply is connected to the second normally open contact of the fourth relay KA11, it is also connected to the negative power input terminals of the charging controller and the communication main control module.

[0034] After the positive output terminal of the standby power supply is connected to the first normally open contact of the fifth relay KA22, it is respectively connected to the fourth end and the second end of the first wiring terminal J8 of the charging controller through the coil of the second relay KA2 and the coil of the third relay KA3; after the positive output terminal of the standby power supply is connected to the first normally open contact of the fifth relay KA22, it is also connected to the positive power input terminals of the charging controller and the communication main control module.

[0035] The positive output terminal of the standby power supply is also sequentially connected to the negative output terminal of the standby power supply through the normally closed contact of the third relay KA3, the normally closed contact of the first relay KA1, and the coil of the fifth relay KA22.

[0036] After the negative output terminal of the standby power supply is connected to the second normally open contact of the fifth relay KA22, it is respectively connected to the first end and the third end of the first wiring terminal J8 of the charging controller; after the negative output terminal of the standby power supply is connected to the second normally open contact of the fifth relay KA22, it is also connected to the negative power input terminals of the charging controller and the communication main control module.

[0037] Connect the output terminals of the main power supply and the standby power supply to the power input terminals of the charging controller and the communication main control module, so that the dual-power switching control part is directly powered by the main power supply and the backup power supply without an independent power supply.

[0038] The coils of the sixth relay K33 and the seventh relay K44 are arranged in the charging controller. A normally open contact of the sixth relay K33 is connected between the third end and the fourth end of the first wiring terminal J8 of the charging controller, and a normally open contact of the seventh relay K44 is connected between the first end and the second end of the first wiring terminal J8 of the charging controller.

[0039] The charging controller is electrically connected to the coil of the sixth relay K33 and the coil of the seventh relay K44, and the charging controller controls the on and off of the coil of the sixth relay K33 and the coil of the seventh relay K44 according to the remote power switching instruction to perform dual power switching. In the embodiment of the utility model, the charging controller provided inside the charging pile is used as the execution module of the dual power switching, and the charging controller is also used for the switching input and output of the charging pile equipment, voltage and current, temperature signal acquisition, charging process control, status monitoring and reporting and other functions.

[0040] In an embodiment of the utility model, the dual power switching circuit of the charging pile also includes a first AC incoming line protection circuit breaker QF1 and a second AC incoming line protection circuit breaker QF2. The first AC incoming line protection circuit breaker QF1 is connected between the output end of the AC power supply and the input end of the main power supply, and the second AC incoming line protection circuit breaker QF2 is connected between the output end of the AC power supply and the input end of the backup power supply.

[0041] In an embodiment of the utility model, the dual power switching circuit of the charging pile also includes a first DC output protection fuse FU1 and a second DC output protection fuse FU2. The first DC output protection fuse FU1 is connected to the output end of the main power supply, and the second DC output protection fuse FU2 is connected to the output end of the backup power supply.

[0042] In the embodiment of the utility model, the charging controller and the communication main control module are connected via a CAN bus. Figure 1 As shown, a wiring terminal J2 and a wiring terminal J24 are respectively provided in the charging controller and the communication main control module, and terminals 1 and 2 of the wiring terminal J2 and the wiring terminal J24 are respectively connected correspondingly for CAN bus data transmission.

[0043] The present invention does not impose any special restrictions on the communication method between the communication main control module and the external control system. Figure 1 As shown, in some embodiments of the utility model, the communication main control module includes a SIM card slot, a 4G module, and a 4G antenna. The communication main control module is connected to an external control system through the SIM card slot, the 4G module, and the 4G antenna. In other embodiments of the utility model, the communication main control module can also be connected to an external control system through Bluetooth, WIFI, 5G, Lora, etc.

[0044] In the embodiment of the present utility model, the charging controller further includes a switching device for controlling the on / off of the coils of the sixth relay K33 and the seventh relay K44. The charging controller controls the on / off of the coils of the sixth relay K33 and the seventh relay K44 through the switching device. As the coils of the sixth relay K33 and the seventh relay K44 are energized and de-energized, the states of the normally open contacts of the coils of the sixth relay K33 and the seventh relay K44 change, thereby affecting the switching of the power supply.

[0045] The dual-power switching circuit of the charging pile provided by the present utility model can automatically switch the power supply or perform power supply switching and system restart under the remote control of an external control system. The specific control logic is as follows:

[0046] (1) When both the main power supply and the standby power supply are working normally, the main power supply is preferentially used for power supply: As Figure 1 shown, in the default state, the coils of the sixth relay K33 and the seventh relay K44 inside the charging controller are de-energized, the normally open contacts of the sixth relay K33 and the seventh relay K44 are normally open, the coils of the second relay KA2 and the third relay KA3 are de-energized, and the normally closed contact of the second relay KA2 is closed. If the main power supply is working normally at this time, the coil of the first relay KA1 is energized, the normally open contact of the first relay KA1 is closed, the normally closed contact is opened, the coil of the fourth relay KA11 is energized, and the coil of the fifth relay KA22 is de-energized, and the system is powered by the main power supply.

[0047] (2) When the standby power supply is normal and the main power supply fails, it automatically switches to the standby power supply for power supply: When the main power supply fails, the coil of the first relay KA1 is de-energized, the normally open contact of the first relay KA1 returns to being normally open, the normally closed contact returns to being normally closed, the coil of the fourth relay KA11 is de-energized, and the coil of the fifth relay KA22 is energized, and the system automatically switches to being powered by the standby power supply.

[0048] (3) When the main power supply fails and is powered by the standby power supply, when the main power supply resumes power supply, it automatically switches to the main power supply for power supply: After the main power supply resumes, the coil of the first relay KA1 is energized, the normally open contact of the first relay KA1 is closed, the normally closed contact is opened, the coil of the fourth relay KA11 is energized, and the coil of the fifth relay KA22 is de-energized, and the system automatically switches to being powered by the main power supply.

[0049] (4) The main power supply and the backup power supply can be remotely selected by an external control system to be powered by the main power supply or the backup power supply: when both the main power supply and the backup power supply are working properly, the default is to be powered by the main power supply. If the charging controller receives a remote power supply switching control instruction, the charging controller controls the coil of the sixth relay K33 to be energized, then the normally open contact of the sixth relay K33 closes, and the coil of the second relay KA2 is energized, and the system automatically switches to the backup power supply; if the system is powered by the backup power supply and the charging controller receives a remote power supply switching control instruction, the charging controller controls the coil of the sixth relay K33 to lose power, then the normally open contact of the sixth relay K33 remains open, and the system automatically switches to the main power supply for power supply.

[0050] (5) The system can be remotely restarted through an external control system: if the charging controller receives a remote restart instruction, the charging controller controls the coils of the sixth relay K33 and the seventh relay K44 to be energized simultaneously, then the coils of the fourth relay KA11 and the fifth relay KA22 lose power, and the output terminals of the main power supply and the backup power supply are both disconnected from the subsequent equipment. Then, the coils of the second relay KA2 and the third relay KA3 lose power, and the system resumes power supply. The entire power supply control system is powered off for milliseconds and then immediately resumes power supply. When the device freezes, the device needs to be remotely upgraded and restarted, or other faults that require restarting occur, the remote device can be directly reset and restarted through the external control system.

[0051] In some embodiments of the present invention, the charging controller is further configured to monitor the usage conditions of the main power supply and the backup power supply and automatically perform power supply switching control through an internal algorithm.

[0052] In other embodiments of the present invention, the charging controller feeds back the usage conditions of the main power supply and the backup power supply to the external control system through the communication main control module, and the external control system remotely performs power supply switching control.

[0053] Currently, ATS is usually applied to the power supply and distribution power system circuits with high requirements for power supply. For small-current and low-power micro-systems, its cost is relatively high. The power supply switching circuit provided by the present invention is composed of multiple relays, with a simple and reliable design, high usability and cost performance. In addition to being used in power supply and distribution power systems with high requirements for power supply such as charging piles, it can also be applied to small-current and low-power micro-systems.

[0054] The utility model has the following beneficial effects: the utility model connects the first relay, the second relay, the third relay, the fourth relay, and the fifth relay between the main power supply, the backup power supply, and the charging controller, and sets the sixth relay and the seventh relay in the charging controller. Through the ingenious connection of each relay coil and the normally open and normally closed contacts of the relay, the purpose of automatically switching the power supply is achieved. In addition, after receiving the remote power switching instruction forwarded by the communication main control module, the charging controller realizes power switching and system restart by controlling the power on and off of the sixth relay and the seventh relay coil. The charging controller and the communication main control module serve as the load of the main power supply and the backup power supply at the same time, without the need for an independent power supply, which solves the problem that the ATS in the prior art needs an independent power supply, and the unavailability of the independent power supply may cause a power switching failure. In summary, the dual power supply switching circuit design of the charging pile provided by this scheme is simple and reliable, low in cost, and has a wide range of applications. It has high power supply stability, can automatically or remotely switch the power supply, reduces the on-site maintenance and after-sales costs of the charging pile, and improves the customer's use efficiency.

[0055] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms of deformation without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A dual-power switching circuit for a charging pile, characterized in that The circuit includes a main power supply, a backup power supply, a charging controller, a communication main control module, a first relay (KA1), a second relay (KA2), a third relay (KA3), a fourth relay (KA11), a fifth relay (KA22), a sixth relay (KA33), and a seventh relay (KA44); After the positive output terminal of the main power supply is connected to the first normally open contact of the fourth relay (KA11), it is respectively connected to the fourth end and the second end of the first connection terminal (J8) of the charging controller through the coil of the second relay (KA2) and the coil of the third relay (KA3); after the positive output terminal of the main power supply is connected to the first normally open contact of the fourth relay (KA11), it is also connected to the positive power input terminals of the charging controller and the communication main control module; The positive output terminal of the main power supply is also sequentially connected to the negative output terminal of the main power supply through the normally open contact of the first relay (KA1) and the coil of the fourth relay (KA11); the normally closed contact of the second relay (KA2) is connected in series with the coil of the first relay (KA1) and is connected in parallel with the branch where the normally open contact of the first relay (KA1) and the coil of the fourth relay (KA11) are located; After the negative output terminal of the main power supply is connected to the second normally open contact of the fourth relay (KA11), it is respectively connected to the first end and the third end of the first connection terminal (J8) of the charging controller; after the negative output terminal of the main power supply is connected to the second normally open contact of the fourth relay (KA11), it is also connected to the negative power input terminals of the charging controller and the communication main control module; After the positive output terminal of the backup power supply is connected to the first normally open contact of the fifth relay (KA22), it is respectively connected to the fourth end and the second end of the first connection terminal (J8) of the charging controller through the coil of the second relay (KA2) and the coil of the third relay (KA3); after the positive output terminal of the backup power supply is connected to the first normally open contact of the fifth relay (KA22), it is also connected to the positive power input terminals of the charging controller and the communication main control module; The positive output terminal of the backup power supply is also sequentially connected to the negative output terminal of the backup power supply through the normally closed contact of the third relay (KA3), the normally closed contact of the first relay (KA1), and the coil of the fifth relay (KA22); After the negative output terminal of the backup power supply is connected to the second normally open contact of the fifth relay (KA22), it is respectively connected to the first end and the third end of the first connection terminal (J8) of the charging controller; after the negative output terminal of the backup power supply is connected to the second normally open contact of the fifth relay (KA22), it is also connected to the negative power input terminals of the charging controller and the communication main control module; The communication main control module is used to receive a remote power supply switching instruction and send it to the charging controller; The coils of the sixth relay (KA33) and the seventh relay (KA44) are arranged inside the charging controller. A normally open contact of the sixth relay (KA33) is connected between the third terminal and the fourth terminal of the wiring terminal (J8) of the charging controller, and a normally open contact of the seventh relay (KA44) is connected between the first terminal and the second terminal of the wiring terminal (J8) of the charging controller; The charging controller is electrically connected to the coils of the sixth relay (KA33) and the seventh relay (KA44), and the charging controller controls the on-off of the coils of the sixth relay (KA33) and the seventh relay (KA44) according to the remote power supply switching instruction to perform dual power supply switching.

2. The dual-power switching circuit of the charging pile according to claim 1, wherein Both the main power supply and the standby power supply are switching power supplies.

3. The dual-power switching circuit of the charging pile according to claim 2, wherein The circuit further includes a first AC incoming line protection circuit breaker (QF1) and a second AC incoming line protection circuit breaker (QF2). The first AC incoming line protection circuit breaker (QF1) is connected between the output terminal of the AC power supply and the input terminal of the main power supply, and the second AC incoming line protection circuit breaker (QF2) is connected between the output terminal of the AC power supply and the input terminal of the standby power supply.

4. The dual-power switching circuit of the charging pile according to claim 1, characterized in that, The circuit further includes a first DC output protection fuse (FU1) and a second DC output protection fuse (FU2). The first DC output protection fuse (FU1) is connected to the output terminal of the main power supply, and the second DC output protection fuse (FU2) is connected to the output terminal of the standby power supply.

5. The dual-power switching circuit of the charging pile according to claim 1, wherein The charging controller and the communication main control module are connected through a CAN bus.

6. The dual-power switching circuit of the charging pile according to claim 1, wherein The charging controller further includes a switching device for controlling the on-off of the coils of the sixth relay (K33) and the seventh relay (K44).

7. The dual-power switching circuit of the charging pile according to claim 1, characterized in that, Other electrical equipment is also connected to the output terminals of the main power supply and the standby power supply.

8. The dual-power switching circuit of the charging pile according to claim 1, characterized in that The communication main control module includes a SIM card slot, a 4G module, and a 4G antenna.

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