Direct current charging pile

Abstract

The utility model provides a DC charging pile comprising a power supply module; one end of the output loop is connected with the direct-current end of the power supply module, and the other end is connected with the direct-current charging gun; one end of the feedback type load loop is connected with the AC end of the power supply module, and the other end is connected with the output loop; one end of the resistive load loop is connected with the alternating current end, and the other end is connected with the output loop; and the main control board is used for controlling the opening / closing of the feedback type load loop and the resistive load loop according to the grid-connected state of the power grid so as to consume the discharge electric quantity through the resistive load loop or transmit the discharge electric quantity to the power grid through the feedback type load loop when the vehicle end discharges. According to the utility model, when the grid connection is allowed by the power grid, the discharge electric quantity can be transmitted to the power grid through the feedback type load loop, so that the energy waste can be avoided, a certain economic value can be created, and when the grid connection is not allowed by the power grid and the vehicle end still has the discharge requirement, the electric quantity needing to be released can be consumed through the resistive load loop.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, in particular to a DC charging pile. Background Art

[0002] At present, most DC charging piles can only meet the normal charging needs of the vehicle side, but cannot meet the discharge needs of the vehicle side.

[0003] A small number of V2G (Vehicle to Grid) bidirectional DC charging and discharging stations can achieve grid-connected discharge and normal charging. However, if the grid does not allow grid connection and the vehicle still needs to discharge, for example, when the vehicle is undergoing a discharge test, the discharge needs of the vehicle cannot be met, and the application scenarios are relatively limited. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a DC charging pile.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] The utility model proposes a DC charging pile, comprising: a power module, the AC end of the power module is connected to the power grid; an output circuit, one end of the output circuit is connected to the DC end of the power module, and the other end of the output circuit is connected to a DC charging gun; a feedback load circuit, one end of the feedback load circuit is connected to the AC end of the power module, and the other end of the feedback load circuit is connected to the output circuit; a resistive load circuit, one end of the resistive load circuit is connected to the AC end, and the other end of the resistive load circuit is connected to the output circuit; a main control board, the main control board is connected to the feedback load circuit and the resistive load circuit, and the main control board is used to control the closing / opening of the feedback load circuit and the resistive load circuit according to the grid connection status of the power grid, so that the discharged electricity is consumed through the resistive load circuit when discharging at the vehicle end, or the discharged electricity is transmitted to the power grid through the feedback load circuit.

[0007] The DC charging pile of the present invention also has the following additional technical features:

[0008] Specifically, the feedback load loop includes: a first switch, one end of which is connected to the AC end of the power module; a feedback load, one end of which is connected to the other end of the first switch, and the other end of which is connected to the output loop.

[0009] Specifically, the resistive load circuit includes: a resistive load; a second switch, one end of the second switch is connected to the resistive load, and the other end of the second switch is connected to the output circuit.

[0010] Furthermore, the resistive load circuit and the feedback load circuit are detachably arranged in a hole reserved at the front end of the output circuit.

[0011] Specifically, the feedback load loop and the resistive load loop are arranged at the back of the DC charging pile.

[0012] Specifically, the above-mentioned DC charging pile also includes: a molded case circuit breaker, one end of which is connected to the power grid; an AC contactor, one end of which is connected to the molded case circuit breaker, and the other end of which is connected to the AC end of the power module.

[0013] Specifically, a relay and a fuse are provided in the output circuit.

[0014] Beneficial effects of the utility model:

[0015] When the grid allows connection, the utility model can invert DC power into grid-connectable AC power through a feedback load circuit and transmit it to the grid, thereby avoiding energy waste and creating certain economic value. When the grid does not allow connection but the vehicle still needs to discharge, the required power can be consumed through the resistive load circuit, meeting various discharge scenarios.

[0016] The detachable discharge device can be spliced ​​together with the old DC charging pile. During use, the internal structure of the charging device will not be changed, forming an integrated charging and discharging device, which improves the utilization rate of the equipment and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a DC charging pile according to an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of a DC charging pile according to another embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Figure 1 This is a schematic diagram of the structure of a DC charging pile according to an embodiment of the present invention. Figure 1As shown, the DC charging pile includes: a power module 1, an output circuit, a feedback load circuit 3, a resistive load circuit 4 and a main control board 5.

[0021] Among them, the AC end of the power module 1 is connected to the power grid; one end of the output circuit is connected to the DC end of the power module 1, and the other end of the output circuit is connected to the DC charging gun 2; one end of the feedback load circuit 3 is connected to the AC end of the power module 1, and the other end of the feedback load circuit 3 is connected to the output circuit; one end of the resistive load circuit 4 is connected to the AC end of the power module 1, and the other end of the resistive load circuit 4 is connected to the output circuit; the main control board 5 is connected to the feedback load circuit 3 and the resistive load circuit 4, and the main control board 5 is used to control the closing / opening of the feedback load circuit 3 and the resistive load circuit 4 according to the grid connection status of the power grid, so as to consume the discharged electricity through the resistive load circuit 4 when discharging at the vehicle end, or to transmit the discharged electricity to the power grid through the feedback load circuit 3.

[0022] Specifically, the power module 1 can be an inverter. When the charging pile is charging the vehicle, the power module 1 converts the AC power output from the grid into DC power to charge the vehicle through the DC charging gun. When there is a discharge demand at the vehicle end, the DC charging of the utility model can be applied to the following two different discharge scenarios:

[0023] If the grid allows connection, the main control board 5 closes the regenerative load circuit 3 and disconnects the resistive load circuit 4. The DC power released by the vehicle flows into the regenerative load circuit. The PFC (Power Factor Correction) and PWM (Pulse Width Modulation) modules in the regenerative load circuit invert the DC power into AC power that meets grid connection requirements. The power is then connected to the grid via the copper busbar on the DC charging station input side. This prevents energy waste and creates economic value.

[0024] If the power grid does not allow grid connection, the main control board 5 controls the resistive load circuit 4 to be closed and the feedback load circuit 3 to be disconnected. The current released by the vehicle end will pass through the resistive load circuit 4, which can convert the electrical energy released by the vehicle end into heat energy and finally release it into the air to consume electricity. A variety of discharge scenarios can be met.

[0025] In one embodiment of the present invention, Figure 2 As shown, a relay M and a fuse FC are provided at the front end of the output circuit.

[0026] Specifically, when discharging at the vehicle end, the main control board controls the relay M to disconnect, disconnecting the DC charging gun from the power module 1 to prevent the discharge voltage from impacting the power module and causing damage to the module.

[0027] In one embodiment of the present invention, Figure 2 As shown, the regenerative load circuit 3 includes a first switch K1 and a regenerative load 31. One end of the first switch K1 is connected to the AC terminal of the power module 1; one end of the regenerative load 31 is connected to the other end of the first switch K1, and the other end of the regenerative load 31 is connected to the output circuit. The resistive load circuit 4 includes a resistive load R and a second switch K2. One end of the second switch K2 is connected to the resistive load R, and the other end of the second switch K2 is connected to the output circuit.

[0028] Specifically, the main control board controls the opening / closing of K1 and K2 to control the closing / opening of the feedback load loop 3 and the resistive load loop 4 .

[0029] In one embodiment of the present invention, the resistive load circuit 4 and the feedback load circuit 3 are detachably arranged in a hole reserved at the front end of the output circuit.

[0030] Specifically, the resistive load circuit 4 and the feedback load circuit 3 are detachable, and the detachable discharge device can be spliced ​​together with the old DC charging pile. The internal structure of the charging device will not be changed during use, forming an integrated charging and discharging device, thereby improving the utilization rate of the equipment and saving costs.

[0031] When conducting a discharge test, the resistive load circuit 4 and the regenerative load circuit 3 can be installed according to the current grid connection status. If the grid allows grid connection, only the regenerative load circuit 3 is installed in the reserved hole to connect the regenerative load circuit 3; if the grid does not allow grid connection, only the resistive load circuit 4 is installed in the reserved hole. In this way, the internal structure of the charging equipment will not be changed during use, which can save costs to a certain extent.

[0032] In an embodiment of the present invention, the feedback load circuit and the resistive load circuit are arranged on the back of the DC charging pile, which is convenient for installation.

[0033] In one embodiment of the present invention, Figure 2 As shown, the above-mentioned DC charging pile may further include: a molded case circuit breaker K3 and an AC contactor K4, wherein one end of the molded case circuit breaker K3 is connected to the power grid; one end of the AC contactor K4 is connected to the molded case circuit breaker, and the other end of the AC contactor is connected to the AC end of the power module.

[0034] Specifically, the molded case circuit breaker K3 can perform short circuit protection and overcurrent protection, and the AC contactor K4 can control the connection and disconnection between the power module 1 and the power grid.

[0035] The utility model uses a dual-circuit electric meter inside the charging pile, which can monitor the charging and discharging electricity in real time during charging and discharging.

[0036] In an embodiment of the present invention, the DC charging pile may be a 60kW DC charging pile.

[0037] The charging pile of the present invention can be a single-gun charging pile or a multi-gun charging pile. In the case of a multi-gun charging pile, the front end of the output circuit of each charging gun can be connected to the feedback load circuit 3 and the resistive load circuit 4 accordingly.

[0038] To sum up, according to the DC charging pile of the embodiment of the present invention, when the grid allows grid connection, the DC can be inverted into grid-connected AC through a feedback load circuit and transmitted to the grid, thereby avoiding energy waste and creating certain economic value. When the grid does not allow grid connection and the vehicle end still has a need to discharge, the required amount of electricity can be consumed through the resistive load circuit, and a variety of discharge scenarios can be met; the detachable discharge device can be spliced ​​together with the old DC charging pile, and the internal structure of the charging device will not be changed during use, forming an integrated charging and discharging device, improving the utilization rate of the equipment and saving costs.

[0039] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0042] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A DC charging pile, characterized in that: include: A power module, wherein an AC terminal of the power module is connected to the power grid; an output circuit, one end of which is connected to the DC terminal of the power module, and the other end of which is connected to the DC charging gun; A feedback load loop, one end of which is connected to the AC end of the power module, and the other end of which is connected to the output loop; a resistive load circuit, one end of which is connected to the AC terminal of the power module, and the other end of which is connected to the output circuit; A main control board is connected to the feedback load circuit and the resistive load circuit. The main control board is used to control the closing / opening of the feedback load circuit and the resistive load circuit according to the grid connection status, so as to consume the discharged electricity through the resistive load circuit during vehicle-end discharge or transmit the discharged electricity to the grid through the feedback load circuit.

2. The DC charging pile according to claim 1, characterized in that: The feedback load loop includes: a first switch, one end of the first switch being connected to the AC end of the power module; A feedback load, one end of the feedback load is connected to the other end of the first switch, and the other end of the feedback load is connected to the output loop.

3. The DC charging pile according to claim 1, characterized in that: The resistive load circuit includes: Resistive load; A second switch, one end of the second switch is connected to the resistive load, and the other end of the second switch is connected to the output loop.

4. The DC charging pile according to claim 1, characterized in that: The resistive load circuit and the feedback load circuit are detachably arranged in a hole reserved at the front end of the output circuit.

5. The DC charging pile according to claim 1, characterized in that: The feedback load circuit and the resistive load circuit are arranged on the back of the DC charging pile.

6. The DC charging pile according to claim 1, characterized in that: Also includes: A molded case circuit breaker, one end of which is connected to the power grid; An AC contactor, one end of which is connected to the molded case circuit breaker, and the other end of which is connected to the AC end of the power module.

7. The DC charging pile according to claim 1, characterized in that: A relay and a fuse are provided at the front end of the output circuit.

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