阅读说明：本技术 一种交流充电桩接地检测与控制装置及交流充电桩 (Alternating-current charging stake ground connection detects and controlling means and alternating-current charging stake ) 是由 杨文东 谢芳 廖宏伟 黄照昆 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种交流充电桩接地检测与控制装置,包括主控芯片、接地检测模块、电源控制模块；接地检测模块包括第一光耦、接地检测信号端以及接地检测电路,接地检测电路通过第一光耦连接至接地检测信号端,接地检测信号端与主控芯片的信号输入端连接；电源控制模块包括交流接触器,主控芯片的控制端与交流接触器连接；在接地检测电路检测到接地故障时,导通第一光耦以输出接地故障信号至接地检测信号端,主控芯片根据接收到的接地故障信号控制交流接触器断开以切断电源。本发明能够实现充电桩的接地故障检测并及时断电,从而完善充电桩的接地故障检测功能,进而提高充电桩的安全性和可靠性。(The invention discloses a grounding detection and control device of an alternating current charging pile, which comprises a main control chip, a grounding detection module and a power supply control module; the grounding detection module comprises a first optical coupler, a grounding detection signal end and a grounding detection circuit, the grounding detection circuit is connected to the grounding detection signal end through the first optical coupler, and the grounding detection signal end is connected with the signal input end of the main control chip; the power supply control module comprises an alternating current contactor, and the control end of the main control chip is connected with the alternating current contactor; when the ground fault is detected by the ground fault detection circuit, the first optocoupler is switched on to output a ground fault signal to the ground fault detection signal end, and the main control chip controls the alternating current contactor to be switched off according to the received ground fault signal so as to cut off a power supply. The ground fault detection and power-off of the charging pile can be realized, so that the ground fault detection function of the charging pile is perfected, and the safety and reliability of the charging pile are improved.)

1. The grounding detection and control device of the alternating current charging pile is characterized by comprising a main control chip, a grounding detection module and a power supply control module;

the grounding detection module comprises a first optical coupler, a grounding detection signal end and a grounding detection circuit, the grounding detection circuit is provided with a ground wire interface used for being connected with a ground wire, a zero line interface used for being connected with a zero line and/or a phase line interface used for being connected with a phase line, the grounding detection circuit is connected to the grounding detection signal end through the first optical coupler, and the grounding detection signal end is connected with the signal input end of the main control chip;

the power supply control module comprises an alternating current contactor, and the control end of the main control chip is connected with the alternating current contactor; when the ground fault is detected by the ground fault detection circuit, the first optocoupler is switched on to output a ground fault signal to the ground fault detection signal end, and the main control chip controls the alternating current contactor to be switched off according to the received ground fault signal so as to cut off a power supply.

2. The ac charging post ground detection and control device of claim 1, wherein the ground detection module further comprises a first power supply, the first power supply is connected to a connection line between a collector of the phototriode in the first optical coupler and the ground detection signal terminal through a first resistor, and an emitter of the phototriode in the first optical coupler is grounded.

3. The ac charging pile ground detection and control device according to claim 1 or 2, wherein the ground detection circuit further comprises a rectifier bridge, a first ac input terminal of the rectifier bridge is connected to the neutral line interface and/or the phase line interface through a first capacitor, and a second ac input terminal of the rectifier bridge is connected to the ground line interface; the positive pole of the direct current output end of the rectifier bridge is connected with the positive pole of the light emitting diode in the first optical coupler, and the negative pole of the light emitting diode in the first optical coupler is connected with the negative pole of the direct current output of the rectifier bridge.

4. The ac charging post ground detection and control device of claim 3, wherein the ground detection circuit further comprises a first zener diode, a second zener diode;

the positive pole of the direct current output end of the rectifier bridge is connected with the positive pole of the light emitting diode in the first optical coupler through the first voltage stabilizing diode, and the negative pole of the light emitting diode in the first optical coupler is connected with the negative pole of the direct current output of the rectifier bridge through the second voltage stabilizing diode.

5. The ac charging post ground detection and control device of claim 4, wherein the ground detection circuit further comprises a current limiting module, and the current limiting module is connected to a connection line between the second ac input terminal of the rectifier bridge and the ground line interface.

6. The ac charging post ground detection and control device of claim 5, wherein said current limiting module comprises a current limiting resistor.

7. The alternating-current charging pile ground detection and control device of claim 1 or 2, wherein the ground detection circuit further comprises a charging power supply, a charging capacitor, a second optical coupler and a charging control module;

the anode of a light emitting diode in the second optocoupler is connected with a second power supply, the cathode of the light emitting diode in the second optocoupler is connected with the control end of the charging control module through a second resistor, the collector of a phototriode in the second optocoupler is connected with the anode of the light emitting diode in the first optocoupler, and the emitter of a phototriode in the second optocoupler is connected with the first end of the charging capacitor;

the output end of the charging power supply is respectively connected with the first end of the charging capacitor and the negative electrode of a third voltage stabilizing diode, and the positive electrode of the third voltage stabilizing diode, the second end of the charging capacitor and the negative electrode of the light emitting diode in the second optocoupler are connected with the ground wire interface.

8. The ac charging post ground detection and control device of claim 7, wherein the ground detection circuit further comprises a third resistor and a fourth resistor, and a negative electrode of the third zener diode is connected to the first end of the charging capacitor through a diode;

one end of the third resistor is connected to a connection line between the cathode of the third zener diode and the diode, and the other end of the third resistor is connected to a connection line between the anode of the third zener diode and the second end of the charging capacitor;

and the fourth resistor is connected in series on a connecting circuit between the first end of the charging capacitor and the emitting electrode of the phototriode in the second optocoupler.

9. The ac charging post ground detection and control device of claim 7, wherein a connection line between said second resistor and a control terminal of said charging control module is grounded through a second capacitor;

one end of the first resistor is connected with the first power supply, and the other end of the first resistor is respectively connected with a collector of a phototriode in the first optocoupler and the grounding detection signal end and is grounded through a third capacitor.

10. An alternating current charging pile characterized by comprising the alternating current charging pile ground fault detection and control device according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of electric vehicle charging, in particular to an alternating current charging pile grounding detection and control device and an alternating current charging pile.

Background

Along with the attention of people to green trip, electric automobile is more and more popular, and corresponding charging equipment such as electric pile also is more and more, and these charging equipment's the security and the reliability of charging also receive much attention. At present, the electric pile industry regulation is not sound, ground fault detection function is the unnecessary item that satisfies, the inventor surveys and researches the current electric pile that fills, partly fill electric pile and does not carry out ground fault detection or existing ground fault detection has unsatisfied safety regulation risk, and along with filling the long-time normal work of electric pile, cable rubber and thermoplastic material ageing resistance reduction often can appear, the condition such as insulating layer spalling appears even, if can't detect and control and fill electric pile and cut off alternating current output when ground connection is suspended like this, the safety incident of charging can produce, have uncontrollable potential harm to user and vehicle.

Disclosure of Invention

The invention provides an alternating-current charging pile ground fault detection and control device and an alternating-current charging pile, which are used for solving the problem that the existing charging pile ground fault detection technology is incomplete.

In order to solve the technical problem, an embodiment of the invention provides a grounding detection and control device for an alternating current charging pile, which comprises a main control chip, a grounding detection module and a power control module;

the grounding detection module comprises a first optical coupler, a grounding detection signal end and a grounding detection circuit, the grounding detection circuit is provided with a ground wire interface used for being connected with a ground wire, a zero line interface used for being connected with a zero line and/or a phase line interface used for being connected with a phase line, the grounding detection circuit is connected to the grounding detection signal end through the first optical coupler, and the grounding detection signal end is connected with the signal input end of the main control chip;

the power supply control module comprises an alternating current contactor, and the control end of the main control chip is connected with the alternating current contactor; when the ground fault is detected by the ground fault detection circuit, the first optocoupler is switched on to output a ground fault signal to the ground fault detection signal end, and the main control chip controls the alternating current contactor to be switched off according to the received ground fault signal so as to cut off a power supply.

In one embodiment, the ground detection module further includes a first power supply, the first power supply is connected to a connection line between a collector of the phototransistor in the first optocoupler and the ground detection signal terminal through a first resistor, and an emitter of the phototransistor in the first optocoupler is grounded.

In one embodiment, the ground detection circuit further includes a rectifier bridge, a first ac input end of the rectifier bridge is connected to the neutral line interface and/or the phase line interface through a first capacitor, and a second ac input end of the rectifier bridge is connected to the ground line interface;

the positive pole of the direct current output end of the rectifier bridge is connected with the positive pole of the light emitting diode in the first optical coupler, and the negative pole of the light emitting diode in the first optical coupler is connected with the negative pole of the direct current output of the rectifier bridge.

In one embodiment, the ground detection circuit further comprises a first zener diode, a second zener diode;

the positive pole of the direct current output end of the rectifier bridge is connected with the positive pole of the light emitting diode in the first optical coupler through the first voltage stabilizing diode, and the negative pole of the light emitting diode in the first optical coupler is connected with the negative pole of the direct current output of the rectifier bridge through the second voltage stabilizing diode.

In one embodiment, the ground detection circuit further includes a current limiting module, and the current limiting module is connected to a connection line between the second ac input terminal of the rectifier bridge and the ground line interface.

In one embodiment, the current limiting module includes a current limiting resistor.

In one embodiment, the ground detection circuit further comprises a charging power supply, a charging capacitor, a second optical coupler and a charging control module;

the anode of a light emitting diode in the second optocoupler is connected with a second power supply, the cathode of the light emitting diode in the second optocoupler is connected with the control end of the charging control module through a second resistor, the collector of a phototriode in the second optocoupler is connected with the anode of the light emitting diode in the first optocoupler, and the emitter of a phototriode in the second optocoupler is connected with the first end of the charging capacitor;

the output end of the charging power supply is respectively connected with the first end of the charging capacitor and the negative electrode of a third voltage stabilizing diode, and the positive electrode of the third voltage stabilizing diode, the second end of the charging capacitor and the negative electrode of the light emitting diode in the second optocoupler are connected with the ground wire interface.

In one embodiment, the ground detection circuit further includes a third resistor and a fourth resistor, and a cathode of the third zener diode is connected to the first end of the charging capacitor through a diode;

one end of the third resistor is connected to a connection line between the cathode of the third zener diode and the diode, and the other end of the third resistor is connected to a connection line between the anode of the third zener diode and the second end of the charging capacitor;

and the fourth resistor is connected in series on a connecting circuit between the first end of the charging capacitor and the emitting electrode of the phototriode in the second optocoupler.

In one embodiment, a connection line between the second resistor and the control end of the charging control module is grounded through a second capacitor;

one end of the first resistor is connected with the first power supply, and the other end of the first resistor is respectively connected with a collector of a phototriode in the first optocoupler and the grounding detection signal end and is grounded through a third capacitor.

The embodiment of the invention also provides the alternating-current charging pile, which comprises the alternating-current charging pile grounding detection and control device.

Compared with the prior art, the embodiment of the invention provides a grounding detection and control device for an alternating current charging pile, which comprises a main control chip, a grounding detection module and a power supply control module; the grounding detection module comprises a first optical coupler, a grounding detection signal end and a grounding detection circuit, the grounding detection circuit is provided with a ground wire interface used for being connected with a ground wire, a zero line interface used for being connected with a zero line and/or a phase line interface used for being connected with a phase line, the grounding detection circuit is connected to the grounding detection signal end through the first optical coupler, and the grounding detection signal end is connected with the signal input end of the main control chip; the power supply control module comprises an alternating current contactor, and the control end of the main control chip is connected with the alternating current contactor; when the ground fault is detected by the ground fault detection circuit, the first optocoupler is switched on to output a ground fault signal to the ground fault detection signal end, and the main control chip controls the alternating current contactor to be switched off according to the received ground fault signal so as to cut off a power supply. Through alternating-current charging stake ground connection detection and controlling means can effectively discern whether ground fault takes place to cut off alternating current power supply output fast when ground fault, in order to reach the protection purpose. Meanwhile, the photoelectric coupler is used for signal isolation, the anti-interference capacity is high, the requirements of the charging system on working safety and insulating performance can be met, the ground fault detection function of the charging pile can be perfected, the safety and the reliability of the charging pile are improved, and the safety of users and the safety of vehicle charging are guaranteed.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an ac charging pile ground fault detection and control apparatus according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of an ac charging pile ground fault detection and control apparatus according to a second embodiment of the present invention;

fig. 3 is a schematic diagram of an ac charging pile ground fault detection and control apparatus according to a second embodiment of the present invention;

fig. 4 is a schematic structural diagram of an ac charging pile ground fault detection and control apparatus according to a third embodiment of the present invention;

fig. 5 is a schematic diagram of an ac charging pile ground fault detection and control apparatus according to a third embodiment of the present invention.

Detailed Description

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The first embodiment of the present invention:

referring to fig. 1, an embodiment of the present invention provides a grounding detection and control device for an ac charging pile, including a main control chip, a grounding detection module, and a power control module; the main control chip can be a control board of the alternating current charging pile, can also be a controller special for grounding detection and control, and can control an alternating current power supply switch to cut off a power supply through an alternating current contactor in time;

the grounding detection module comprises a first optical coupler OC1, a grounding detection signal end signal and a grounding detection circuit, the grounding detection circuit is provided with a ground wire interface used for being connected with a ground wire PE, a zero line interface used for being connected with a zero line ACN and/or a phase line interface used for being connected with a phase line, the grounding detection circuit is connected to the grounding detection signal end signal through the first optical coupler OC1, and the grounding detection signal end signal is connected with a signal input end of the main control chip; the power supply control module comprises an alternating current contactor, and the control end of the main control chip is connected with the alternating current contactor;

in this embodiment, when the ground fault is detected by the ground fault detection circuit, that is, when the ground is disconnected, the ground fault detection circuit turns on the first optocoupler OC1 to output a ground fault signal to the ground fault detection signal terminal signal, so that the main control chip controls the ac contactor to be disconnected according to the received ground fault signal to cut off the power supply.

The alternating-current charging pile can effectively identify whether the ground fault occurs or not through the alternating-current charging pile ground detection and control device, so that the output of an alternating-current power supply is quickly cut off when the ground fault occurs, and the protection purpose is achieved. Meanwhile, the photoelectric coupler is used for signal isolation, the anti-interference capacity is high, the requirements of the charging system on working safety and insulating performance can be met, the ground fault detection function of the charging pile can be perfected, the safety and the reliability of the charging pile are improved, and the safety of users and the safety of vehicle charging are guaranteed.

In one embodiment, the ground detection module further includes a first power VCC1, the first power VCC1 is connected to a connection line between a collector of the phototransistor in the first optocoupler OC1 and the ground detection signal terminal signal through a first resistor R1, and an emitter of the phototransistor in the first optocoupler OC1 is grounded.

In this embodiment, main control chip can judge through the high low level of ground connection detection signal end signal output whether ground connection fills electric pile's pile body, works as emitting diode switches on in the first opto-coupler OC1, when ground connection detection signal end signal output is the low level, main control chip can this judge ground connection disconnection, and discernment pile body ground connection is unusual, and passes through ac contactor cuts off relay K1, K2 disconnect-type power, and the ground fault who fills electric pile through effective discernment cuts off the response of ac power supply input like this, guarantees user charging safety. The following are the second and third embodiments further optimizing the first embodiment, specifically as follows:

second embodiment of the invention:

referring to fig. 2, the grounding detection and control device of the ac charging pile according to the first embodiment of the present invention is further optimized in the second embodiment of the present invention, where the grounding detection circuit further includes a rectifier bridge, a first ac input end of the rectifier bridge is connected to a neutral line ACN through a first capacitor C8, and a second ac input end of the rectifier bridge is connected to a ground line PE through the ground line interface; the positive pole of the direct current output end of the rectifier bridge is connected with the positive pole of a light emitting diode in the first optical coupler OC1, and the negative pole of the light emitting diode in the first optical coupler OC1 is connected with the negative pole of the direct current output of the rectifier bridge. The first power supply is selected to be 3.3V, so that when the first optical coupler is in ground fault, the first optical coupler is not conducted, and a high level is output to a signal of the ground detection signal end.

Referring to fig. 3, in the present embodiment, ac-dc conversion is implemented through the rectifier bridge, when grounding is good, the light emitting diode in the first optocoupler OC1 is not turned on, and then the grounding detection signal terminal signal is at a high level and is input to the main control chip of the ac charging pile, and the main control chip determines that the grounding state is normal according to a preset program. And when the grounding is disconnected, the light emitting diode in the first optical coupler OC1 is conducted, so that the signal of the grounding detection signal end is low level and is input to the main control chip of the alternating current charging pile, the main control chip identifies the grounding abnormality of the pile body, and after the charging pile identifies the grounding abnormality, the contacts K1 and K2 of the alternating current output relay are controlled to be disconnected so as to cut off the alternating current output power supply. It can be understood that the main control chip controls the on/off of the ac output power through the contacts K1, K2 (not shown in the figure) of the ac output relay.

Preferably, in order to stabilize the voltage of the loop and improve the stability of the loop, the ground detection circuit further includes a first zener diode D1, a second zener diode D2; the anode of the direct current output end of the rectifier bridge is connected with the anode of a light emitting diode in the first optical coupler OC1 through the first voltage stabilizing diode D1, and the cathode of the light emitting diode in the first optical coupler OC1 is connected with the cathode of the direct current output of the rectifier bridge through the second voltage stabilizing diode D2.

In one preferred embodiment, in order to improve the safety of the circuit, the ground fault detection circuit further includes a current limiting module, and the current limiting module is connected to a connection line between the second ac input end of the rectifier bridge and the ground line interface. According to the embodiment, the current limiting module can effectively cause a discharging event due to overlarge current when the ground wire is disconnected due to the fault of the ground wire and the loop is short-circuited, so that the safety of an operator is protected. Preferably, as shown in fig. 2, the current limiting module includes a current limiting resistor, and a resistance value of the current limiting resistor may be selected to be 1 kilo-ohm.

In the second embodiment of the invention, the grounding detection and control device of the alternating current charging pile is optimized through the first power supply VCC1, the rectifier bridge, the first resistor R1, the first optical coupler OC1, grounding and the like, and whether a grounding fault occurs or not is rapidly identified through a detection signal of a signal at a grounding detection signal end and the main control chip, so that the output of the alternating current power supply is cut off, and the protection purpose is realized. When will alternating-current charging stake ground connection detection and controlling means is applied to alternating-current charging stake back, can effectively discern alternating-current charging stake's ground fault, carry out the response of cutting off alternating current power supply input to alternating-current charging stake's ground fault, improve the security and the reliability of filling electric pile, ensure user's safety and vehicle charging safety.

Third embodiment of the invention:

referring to fig. 4, a grounding detection and control device of an ac charging pile according to a first embodiment of the present invention is further optimized in a third embodiment, where the grounding detection circuit further includes a charging power supply, a charging capacitor C5, a second optocoupler OC2, and a charging control module; the phase line interface is used for connecting the charging power supply, and the charging power supply comprises a power supply AC and four capacitors C1, C2, C3 and C4;

the anode of a light emitting diode in the second optical coupler OC2 is connected with a second power supply VCC2, the cathode of the light emitting diode in the second optical coupler OC2 is connected with the control end of the charging control module through a second resistor R2, the collector of a phototriode in the second optical coupler OC2 is connected with the anode of the light emitting diode in the first optical coupler OC1, and the emitter of a phototriode in the second optical coupler OC2 is connected with the first end of the charging capacitor C5;

the output end of the charging power supply is respectively connected with the first end of the charging capacitor C5 and the cathode of a third voltage-stabilizing diode D3, and the anode of the third voltage-stabilizing diode D3, the second end of the charging capacitor C5 and the cathode of a light-emitting diode in the second optical coupler OC2 are connected with the ground wire interface. The charging control module is an MCU. Wherein the second power supply is selected to be 3.3V.

Referring to fig. 5, in the present embodiment, the charging control module controls the on/off of the second optocoupler OC2, so as to control the charging and discharging processes of the charging capacitor C5 in the main circuit.

When the charging control module controls the second optical coupler OC2 to be conducted to enter a grounding detection mode, at this time, the charging capacitor C5 is in a discharging process, if grounding is good, a light emitting diode in the first optical coupler OC1 is conducted, and a signal at a grounding detection signal end outputs a low level; if the grounding is disconnected, the light emitting diode in the first optical coupler OC1 is not conducted, the grounding detection signal end signal outputs high level, the main control chip judges that the grounding fault occurs according to the high level signal, and after the grounding fault is identified, the contacts K1 and K2 of the alternating current output relay are controlled to be disconnected so as to cut off the alternating current output power supply.

Preferably, in order to improve the stability of the loop, the ground detection circuit further includes a third resistor R3 and a fourth resistor R4, and a cathode of the third zener diode D3 is connected to the first end of the charging capacitor C5 through a diode;

one end of the third resistor R3 is connected to a connection line between the cathode of the third zener diode D3 and the diode, and the other end of the third resistor R3 is connected to a connection line between the anode of the third zener diode D3 and the first end of the charging capacitor C5;

the fourth resistor R4 is connected in series to a connection line between the first end of the charging capacitor C5 and the emitter of the photo-transistor in the second optocoupler OC 2.

In this embodiment, the third resistor R3 is connected in parallel with the charging capacitor C5, so that the charging capacitor C5 can be filtered, and the output in the loop can be smoother, which is beneficial to enhancing the anti-interference capability of the circuit and improving the stability of the loop.

In order to further optimize the circuit structure, the connection line between the second resistor R2 and the control terminal of the charging control module is grounded through a second capacitor C6;

one end of the first resistor R1 is connected with the first power supply VCC1, and the other end of the first resistor R1 is respectively connected with a collector of a phototriode in the first optocoupler OC1 and a signal at the ground detection signal end and is grounded through a third capacitor C7.

The third embodiment of the invention is optimized by a power supply, the second optical coupler OC2, a capacitor, a resistor, a diode, the third voltage stabilizing diode and the like, and the charging and discharging processes of the charging capacitor C5 in the main loop can be effectively controlled by the on and off of the second optical coupler OC 2. In the discharge process of C5, if ground connection is good, the first opto-coupler OC1 is conducted, the ground connection detection signal end signal outputs low level, otherwise, high level is output, and ground fault occurs. This embodiment can adopt optoelectronic coupling to keep apart as the signal on effective ground fault's that detects basis, and the stability and the interference killing feature of circuit are strong, and work safety, satisfy and fill electric pile insulating properties requirement, safety standard requirement, and the components and parts lectotype wide range.

The fourth embodiment of the present invention:

the fourth embodiment of the invention provides an alternating-current charging pile, which is applied to the alternating-current charging pile ground fault detection and control device, so that ground fault detection of the charging pile can be realized, and power can be cut off in time, so that the ground fault detection function of the charging pile is perfected, the safety and reliability of the charging pile are improved, and the safety of users and the safety of vehicle charging are guaranteed.

It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.