Device for absorbing output surge and direct current charging equipment

Abstract

A device for absorbing output surges comprises a surge absorption capacitor and a surge absorption resistor. The surge absorption resistor multiplexes a bleeder resistor in a bleeder circuit connected in parallel at the two ends of the output capacitor; the first end of the bleeder resistor is connected with the first end of a load through the surge absorption capacitor, and the second end of the bleeder resistor is connected with the second end of the load. The direct current charging equipment comprises a voltage conversion module, a bleeder circuit, an output capacitor and a device for absorbing output surges. According to the device for absorbing the output surge and the direct-current charging equipment comprising the device for absorbing the output surge, the high-power resistor in the bleeder circuit is ingeniously utilized, an RC absorption circuit can be formed at the output port of the module, and surge voltage generated by output is absorbed, so that the problem of the output surge is perfectly solved, and the service life of the output surge is prolonged. And moreover, devices are saved, the size is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of direct current charging piles, and more specifically, to a device for absorbing output surges, and direct current charging equipment comprising the device for absorbing output surges. Background Art

[0002] In the current DC charging piles, some charging cables are very long. During the charging process, if there is an abnormal situation, the charging pile will be shut down in an emergency. In this process, a large surge voltage will be generated at the output. The anti-reverse diode of the DC charging module in the DC charging pile will be subjected to a relatively large voltage stress, so it is necessary to consider reducing the surge voltage of the anti-reverse diode in the design. The traditional surge voltage solution is to connect an RC absorption circuit in parallel (series) at the switch end to reduce overvoltage shock. However, adding series-parallel RC absorption circuits will inevitably increase the volume and cost of the entire circuit. Utility Model Content

[0003] The technical problem to be solved by the utility model is that, in view of the above-mentioned defects of the prior art, a device for absorbing output surge is provided, which cleverly utilizes the high-power resistor in the discharge circuit to form an RC absorption circuit at the module output port to absorb the surge voltage generated by the output.

[0004] The utility model adopts the technical solution to solve the technical problem as follows: construct a device for absorbing output surges, including a surge absorption capacitor and a surge absorption resistor; the surge absorption resistor reuses a discharge resistor in a discharge circuit connected in parallel at both ends of the output capacitor; the first end of the discharge resistor is connected to the first end of a load via the surge absorption capacitor, and the second end is connected to the second end of the load.

[0005] The device for absorbing output surges described in the utility model further comprises an anti-reverse diode, wherein the anode of the anti-reverse diode is connected to the first end of the output capacitor and the cathode is connected to the first end of the load.

[0006] The utility model adopts the following technical scheme to solve the technical problem: construct a device for absorbing output surge, which is composed of a discharge switch tube, a discharge resistor, a surge absorption capacitor and an anti-reverse diode; the control end of the discharge switch tube receives a control signal, the first end is connected to the first end of the discharge resistor and the first end of the surge absorption capacitor, and the second end is connected to the first end of the output capacitor; the second end of the discharge resistor is connected to the second end of the output capacitor and the second end of the load; the second end of the surge absorption capacitor is connected to the first end of the load; the anode of the anti-reverse diode is connected to the first end of the output capacitor, and the cathode is connected to the first end of the load; when the discharge switch tube is closed, the surge absorption capacitor and the discharge resistor form an RC surge absorption circuit for absorbing output surge.

[0007] The technical solution adopted by the utility model to solve its technical problems is: construct a DC charging device, including a voltage conversion module, a discharge circuit and an output capacitor, the discharge circuit is connected to the two ends of the output capacitor and includes a discharge resistor; the DC charging device further includes a device for absorbing output surges; the device for absorbing output surges includes a surge absorption capacitor; the first end of the discharge resistor is connected to the first end of the load through the surge absorption capacitor, and the second end is connected to the second end of the load; when the discharge circuit is turned on, the surge absorption capacitor and the discharge resistor form an RC surge absorption circuit for absorbing output surges.

[0008] In the DC charging device described in the utility model, the discharge circuit further includes a discharge switch tube; the control end of the discharge switch tube receives a control signal, the first end is connected to the first end of the discharge resistor and the first end of the surge absorption capacitor, and the second end is connected to the first end of the output capacitor.

[0009] The DC charging device described in the utility model further includes an anti-reverse diode, wherein the anode of the anti-reverse diode is connected to the first end of the output capacitor and the cathode is connected to the first end of the load.

[0010] In the DC charging device described in the utility model, the voltage conversion module includes an AC / DC conversion circuit and a DC / DC conversion circuit.

[0011] In the DC charging device described in the utility model, the voltage conversion module includes a first DC / DC conversion circuit and a second DC / DC conversion circuit.

[0012] The device for absorbing output surges and the DC charging device including the device for absorbing output surges of the utility model cleverly utilize the high-power resistor in the discharge circuit to form an RC absorption circuit at the module output port to absorb the surge voltage generated by the output, thereby perfectly solving the output surge problem and saving components, reducing the volume and reducing the cost. And because of its sophisticated design, it can be widely used in various DC charging devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0014] Figure 1 It is a circuit diagram of a preferred embodiment of the output surge absorbing device and the DC charging device of the utility model;

[0015] Figure 2 It is a circuit diagram of another preferred embodiment of the output surge absorbing device and DC charging equipment of the utility model. DETAILED DESCRIPTION

[0016] 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.

[0017] In DC charging equipment, according to the requirements of the charging standard, the voltage on the output capacitor has a prescribed discharge time requirement, so a discharge circuit is generally added. The discharge circuit usually includes a high-power discharge resistor. The discharge circuit is turned on after receiving the discharge instruction, and then the voltage on the output capacitor is discharged through the high-power resistor. The device for absorbing output surges in the present application, by multiplexing the high-power discharge resistors in the discharge circuit connected in parallel at both ends of the output capacitor, cleverly utilizes the high-power resistors in the discharge circuit, and can form an RC absorption circuit at the module output port to absorb the surge voltage generated by the output. Therefore, it not only perfectly solves the output surge problem, but also saves devices, reduces the size, and reduces costs. And because of its sophisticated design, it can be widely used in various DC charging equipment.

[0018] Figure 1 FIG. 1 is a circuit diagram of a preferred embodiment of the output surge absorbing device and the DC charging device of the utility model. Figure 1 As shown, the device for absorbing output surge of the utility model includes a surge absorption capacitor C1 and a surge absorption resistor R1; the surge absorption resistor R1 reuses the discharge resistor R1 in the discharge circuit connected in parallel at both ends of the output capacitor C2. That is, the resistor R1 is used as a surge absorption resistor and a discharge resistor at the same time. The first end of the surge absorption resistor / discharge resistor R1 is connected to the first end of the load through the surge absorption capacitor C1, and the second end is connected to the second end of the load.

[0019] exist Figure 1 In the preferred embodiment shown, the device for absorbing output surge may further include an anti-reverse diode D1, the anode of the anti-reverse diode is connected to the first end of the output capacitor C2, and the cathode of the anti-reverse diode is connected to the first end of the load.

[0020] Figure 1A device for absorbing output surge is further shown, which is composed of a discharge switch tube Q1, a discharge resistor R1, a surge absorption capacitor C1 and an anti-reverse diode D1. The control end of the discharge switch tube Q1 receives a control signal, the first end is connected to the first end of the discharge resistor R1 and the first end of the surge absorption capacitor C1, and the second end is connected to the first end of the output capacitor; the second end of the discharge resistor R1 is connected to the second end of the output capacitor C2 and the second end of the load; the second end of the surge absorption capacitor C1 is connected to the second end of the load; the anode of the anti-reverse diode D1 is connected to the first end of the output capacitor C2, and the cathode is connected to the first end of the load. When the discharge switch tube Q1 is closed, the surge absorption capacitor C1 and the discharge resistor R1 form an RC surge absorption circuit for absorbing output surges.

[0021] In a preferred embodiment of the utility model, the discharge switch tube Q1 is a triode, an IGBT tube, a MOS tube, etc. When the discharge switch tube is a triode, its control end is the base, the first end is the emitter, and the second end is the collector; when the discharge switch tube is an IGBT tube or a MOS tube, its control end is the gate, the first end is the source, and the second end is the drain.

[0022] Figure 1 A DC charging device is further shown, including an AC / DC conversion circuit, a DC / DC conversion circuit, a discharge circuit and an output capacitor C2, and a device for absorbing output surges. The device for absorbing output surges includes a surge absorbing capacitor C1. Figure 1 As shown, the discharge circuit is connected to both ends of the output capacitor C2 and includes a discharge resistor R1. When the discharge circuit is turned on, the surge absorption capacitor C1 and the discharge resistor R1 form an RC surge absorption circuit for absorbing output surges.

[0023] exist Figure 1 In the preferred embodiment shown, the discharge circuit further includes a discharge switch tube Q1. The first end of the discharge resistor R1 is connected to the first end of the load via the surge absorption capacitor C1, and the second end is connected to the second end of the load. The control end of the discharge switch tube Q1 receives a control signal, the first end is connected to the first end of the discharge resistor R1 and the first end of the surge absorption capacitor C1, and the second end is connected to the first end of the output capacitor. When the control end of the discharge switch tube Q1 receives the discharge control signal, the discharge switch tube Q1 is turned on, so the surge absorption capacitor C1 and the discharge resistor R1 form an RC surge absorption circuit for absorbing output surges, and discharge the voltage on the output capacitor C2.

[0024] Therefore, in Figure 1In the DC charging device shown, by reusing the high-power discharge resistor R1, the surge absorption capacitor C1 and the discharge resistor R1 form an RC surge absorption circuit for absorbing output surges, which can absorb the surge voltage generated by the output port.

[0025] In a preferred embodiment of the present invention, the discharge switch tube Q1 is a triode, an IGBT tube, a MOS tube, etc. When the discharge switch tube is a triode, its control end is the base, the first end is the emitter, and the second end is the collector; when the discharge switch tube is an IGBT tube or a MOS tube, its control end is the gate, the first end is the source, and the second end is the drain. In other preferred embodiments of the present invention, other suitable switching devices may be used to replace the discharge switch tube, such as a relay, etc.

[0026] In the present invention, the AC / DC conversion circuit and the DC / DC conversion circuit may adopt any suitable conversion circuit known in the art, which are all applicable to the present invention and will not be described again here.

[0027] Figure 1 The DC charging device shown preferably further includes an anti-reverse diode D1, an anode of the anti-reverse diode is connected to the first end of the output capacitor C2, and a cathode of the anti-reverse diode is connected to the first end of the load.

[0028] The device for absorbing output surges and the DC charging device including the device for absorbing output surges of the utility model cleverly utilize the high-power resistor in the discharge circuit to form an RC absorption circuit at the module output port to absorb the surge voltage generated by the output, thereby not only perfectly solving the output surge problem, but also saving devices, reducing the volume and reducing the cost.

[0029] Figure 2 It is a circuit diagram of another preferred embodiment of the output surge absorbing device and DC charging equipment of the utility model. Figure 2 The DC charging equipment shown is Figure 1 The DC charging device shown is a two-stage DC / DC converter, that is, it includes a first DC / DC conversion circuit, a second DC / DC conversion circuit, a discharge circuit and an output capacitor C2, and the aforementioned device for absorbing output surges.

[0030] In the present invention, the first and second DC / DC conversion circuits may adopt any suitable conversion circuits known in the art, which are all applicable to the present invention and will not be described again herein. Figure 2 The DC charging equipment shown is Figure 1 The DC charging device shown is similar in principle and construction.

[0031] The device for absorbing output surges and the DC charging device including the device for absorbing output surges of the utility model cleverly utilize the high-power resistor in the discharge circuit to form an RC absorption circuit at the module output port to absorb the surge voltage generated by the output, thereby perfectly solving the output surge problem and saving components, reducing the volume and reducing the cost. And because of its sophisticated design, it can be widely used in various DC charging devices.

[0032] 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.

[0033] 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 device for absorbing output surge, characterized in that: It includes a surge absorption capacitor and a surge absorption resistor; the surge absorption resistor reuses the discharge resistor in the discharge circuit connected in parallel at both ends of the output capacitor; the first end of the discharge resistor is connected to the first end of the load through the surge absorption capacitor, and the second end is connected to the second end of the load.

2. The device for absorbing output surge according to claim 1, characterized in that: It further includes an anti-reverse diode, wherein the anode of the anti-reverse diode is connected to the first end of the output capacitor and the cathode of the anti-reverse diode is connected to the first end of the load.

3. A device for absorbing output surge, characterized in that: It is composed of a discharge switch tube, a discharge resistor, a surge absorption capacitor and an anti-reverse diode; the control end of the discharge switch tube receives a control signal, the first end is connected to the first end of the discharge resistor and the first end of the surge absorption capacitor, and the second end is connected to the first end of the output capacitor; the second end of the discharge resistor is connected to the second end of the output capacitor and the second end of the load; the second end of the surge absorption capacitor is connected to the first end of the load; the anode of the anti-reverse diode is connected to the first end of the output capacitor, and the cathode is connected to the first end of the load; when the discharge switch tube is closed, the surge absorption capacitor and the discharge resistor form an RC surge absorption circuit for absorbing output surges.

4. A DC charging device, comprising a voltage conversion module, a discharge circuit and an output capacitor, wherein the discharge circuit is connected to both ends of the output capacitor and comprises a discharge resistor; characterized in that: The DC charging device further includes a device for absorbing output surges; the device for absorbing output surges includes a surge absorption capacitor; the first end of the discharge resistor is connected to the first end of the load via the surge absorption capacitor, and the second end is connected to the second end of the load; when the discharge circuit is turned on, the surge absorption capacitor and the discharge resistor form an RC surge absorption circuit for absorbing output surges.

5. The DC charging device according to claim 4, characterized in that: The discharge circuit further includes a discharge switch tube; the control end of the discharge switch tube receives a control signal, the first end is connected to the first end of the discharge resistor and the first end of the surge absorption capacitor, and the second end is connected to the first end of the output capacitor.

6. The DC charging device according to claim 5, characterized in that: It further includes an anti-reverse diode, wherein the anode of the anti-reverse diode is connected to the first end of the output capacitor and the cathode of the anti-reverse diode is connected to the first end of the load.

7. The DC charging device according to claim 5, characterized in that: The voltage conversion module includes an AC / DC conversion circuit and a DC / DC conversion circuit.

8. The DC charging device according to claim 5, characterized in that: The voltage conversion module includes a first DC / DC conversion circuit and a second DC / DC conversion circuit.

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