CN106229942A - A control circuit of a leakage protection device - Google Patents

A control circuit of a leakage protection device Download PDF

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Publication number
CN106229942A
CN106229942A CN201610877264.4A CN201610877264A CN106229942A CN 106229942 A CN106229942 A CN 106229942A CN 201610877264 A CN201610877264 A CN 201610877264A CN 106229942 A CN106229942 A CN 106229942A
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module
resistance
alternating current
zero
control signal
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曾昭立
郭兰旺
黄远媚
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Zhongshan To Head Electrical Co ltd
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Zhongshan To Head Electrical Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors

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  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a control circuit of a leakage protection device, which comprises an alternating current input interface for connecting a zero line and a live line, a relay switch capable of being reset and disconnected and an alternating current output interface for outputting the zero line and the live line which are connected in sequence, a zero-sequence current transformer module used for detecting leakage current and outputting a tripping control signal when the leakage current is detected to exceed a preset value is arranged on a zero-live line between the relay switch and the alternating current output interface, the control circuit also comprises a relay coil corresponding to the relay switch and an alternating current-direct current conversion module which is connected on the alternating current input interface in parallel and is used for supplying power to the relay coil and the zero sequence current transformer module in parallel, the output end of the alternating current-direct current conversion module is also connected with a controlled shunt module in parallel, and the control signal input end of the controlled shunt module is connected with the tripping control signal output end of the zero sequence current transformer module. The present case simple structure easily realizes that the practicality is good.

Description

一种漏电保护装置的控制电路A control circuit of a leakage protection device

[技术领域][technical field]

本发明涉及一种漏电保护装置的控制电路。The invention relates to a control circuit of a leakage protection device.

[背景技术][Background technique]

现有的漏电保护开关的控制电路，其结构复杂，有必要进行改进。The existing control circuit of the leakage protection switch has a complicated structure and needs to be improved.

[发明内容][Content of the invention]

本发明克服了上述技术的不足，提供了一种漏电保护装置的控制电路，其结构简单易实现，实用性好。The invention overcomes the disadvantages of the above-mentioned technologies, and provides a control circuit of an electric leakage protection device, which has a simple structure, is easy to realize, and has good practicability.

为实现上述目的，本发明采用了下列技术方案：To achieve the above object, the present invention adopts the following technical solutions:

一种漏电保护装置的控制电路，包括有顺次连接的用于零火线接入的交流电输入接口1、可复位断开的继电器开关2、以及用于零火线输出的交流电输出接口3，所述继电器开关2与交流电输出接口3之间的零火线上设有用于漏电流检测并且在检测到漏电流超过预设值时输出脱扣控制信号的零序电流互感器模块4，所述控制电路还包括有与所述继电器开关2对应的继电器线圈5、以及并联在所述交流电输入接口1上用于向所述继电器线圈5和所述零序电流互感器模块4并列供电的交直流转换模块6，所述交直流转换模块6输出端还并联有受控分流模块7，所述受控分流模块7控制信号输入端与所述零序电流互感器模块4的脱扣控制信号输出端相连接。A control circuit of a leakage protection device, comprising an alternating current input interface 1 connected in sequence for connecting a neutral and live wire, a relay switch 2 that can be reset and disconnected, and an alternating current output interface 3 for outputting a neutral and live wire, the A zero-sequence current transformer module 4 is provided on the zero live line between the relay switch 2 and the AC output interface 3 for leakage current detection and outputs a trip control signal when the leakage current exceeds a preset value, and the control circuit also It includes a relay coil 5 corresponding to the relay switch 2, and an AC/DC conversion module 6 connected in parallel to the AC input interface 1 for supplying power to the relay coil 5 and the zero-sequence current transformer module 4 in parallel The output end of the AC-DC conversion module 6 is also connected in parallel with a controlled shunt module 7 , and the control signal input end of the controlled shunt module 7 is connected to the tripping control signal output end of the zero-sequence current transformer module 4 .

如上所述的一种漏电保护装置的控制电路，所述交直流转换模块6包括有压敏电阻MOV、电阻R1、电阻R2A、电阻R2B、二极管D1、二极管D2、电容C1、以及极性电容C2，所述压敏电阻MOV一端作为所述交直流转换模块6一电源输入端与所述交流电输入接口1零线连接端、二极管D1正极、极性电容C2负极相连接后作为所述交直流转换模块6负极电源输出端，所述压敏电阻MOV另一端作为所述交直流转换模块6另一电源输入端与所述交流电输入接口1火线连接端、电阻R1一端相连接，所述电阻R1另一端与所述电阻R2A一端、电容C1一端相连接，所述电阻R2A另一端通过所述电阻R2B与所述二极管D1负极、电容C1另一端、二极管D2正极相连接，所述二极管D2负极与所述极性电容C2正极相连接后作为所述交直流转换模块6正极电源输出端相连接。In the control circuit of a leakage protection device as described above, the AC-DC conversion module 6 includes a piezoresistor MOV, a resistor R1, a resistor R2A, a resistor R2B, a diode D1, a diode D2, a capacitor C1, and a polar capacitor C2 , one end of the varistor MOV is used as the power input end of the AC-DC conversion module 6 and is connected to the neutral line connection end of the AC input interface 1, the positive pole of the diode D1, and the negative pole of the polarity capacitor C2 to serve as the AC-DC conversion Module 6 negative power supply output end, the other end of the varistor MOV is used as the other power input end of the AC-DC conversion module 6, connected to the live wire connection end of the AC input interface 1, and one end of the resistor R1, and the other end of the resistor R1 One end is connected to one end of the resistor R2A and one end of the capacitor C1, the other end of the resistor R2A is connected to the cathode of the diode D1, the other end of the capacitor C1, and the anode of the diode D2 through the resistor R2B, and the cathode of the diode D2 is connected to the anode of the diode D2. The positive polarity of the polarity capacitor C2 is connected as the output terminal of the positive power supply of the AC-DC conversion module 6 .

如上所述的一种漏电保护装置的控制电路，所述受控分流模块7包括有电阻R3、电容C3、以及三端可控硅SCR，所述电阻R3一端作为所述受控分流模块7一电源连接端与所述交直流转换模块6一电源输出端相连接，所述电阻R3另一端与所述三端可控硅SCR正极连接端，所述三端可控硅SCR负极连接端与所述电容C3一端相连接后作为所述受控分流模块7另一电源连接端与所述交直流转换模块6另一电源输出端相连接，所述三端可控硅SCR控制信号输入端与所述电容C3另一端相连接后作为所述受控分流模块7控制信号输入端与所述零序电流互感器模块4的脱扣控制信号输出端相连接。In the control circuit of a leakage protection device as described above, the controlled shunt module 7 includes a resistor R3, a capacitor C3, and a triac SCR, and one end of the resistor R3 serves as a control circuit of the controlled shunt module 7 The power supply connection end is connected to a power output end of the AC-DC conversion module 6, the other end of the resistor R3 is connected to the positive connection end of the three-terminal thyristor SCR, and the negative connection end of the three-terminal thyristor SCR is connected to the three-terminal thyristor SCR. One end of the capacitor C3 is connected as the other power connection end of the controlled shunt module 7 to the other power output end of the AC-DC conversion module 6, and the triac SCR control signal input end is connected to the The other end of the capacitor C3 is connected as the control signal input end of the controlled shunt module 7 to the trip control signal output end of the zero-sequence current transformer module 4 .

如上所述的一种漏电保护装置的控制电路，所述交流电输入接口1与所述交流电输出接口3之间还连接有用于产生漏电流的测试开关模块8，所述测试开关模块8包括有电阻R8和手动测试开关TEST，所述电阻R8一端与所述交流电输入接口1零线连接端相连接，所述电阻R8另一端通过所述手动测试开关TEST与所述交流电输出接口3火线连接端相连接。In the control circuit of a leakage protection device as described above, a test switch module 8 for generating leakage current is also connected between the AC input interface 1 and the AC output interface 3, and the test switch module 8 includes a resistor R8 and a manual test switch TEST, one end of the resistor R8 is connected to the neutral wire connection end of the AC input interface 1, and the other end of the resistor R8 is connected to the live wire connection end of the AC output interface 3 through the manual test switch TEST. connect.

与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:

1、本案结构简单易实现，使用时，所述交流电输入接口接通外部交流电，所述交直流转换模块进行交直流转换后向所述继电器线圈和所述零序电流互感器模块供电，当手动使所述继电器开关接通时，所述继电器线圈在所述交直流转换模块的供电作用下吸住所述继电器开关而维持其接通；某时若所述零序电流互感器模块检测到漏电流超过预设值则向输出脱扣控制信号，控制所述受控分流模块导通进行分流，使得所述继电器线圈上电流降低而不能维持所述继电器开关的接通，所述继电器开关复位断开，实现安全保护控制。1. The structure of this case is simple and easy to implement. When in use, the AC input interface is connected to an external AC power, and the AC-DC conversion module supplies power to the relay coil and the zero-sequence current transformer module after performing AC-DC conversion. When the relay switch is turned on, the relay coil absorbs the relay switch under the power supply of the AC-DC conversion module to keep it turned on; if the zero-sequence current transformer module detects a leakage current If the preset value is exceeded, a tripping control signal is output to control the controlled shunt module to turn on and shunt, so that the current on the relay coil is reduced and the relay switch cannot be maintained, and the relay switch is reset and turned off. , to achieve security protection control.

2、交直流转换模块采用阻容降压电路，其有利于减少工作时的发热。2. The AC-DC conversion module adopts a resistance-capacity step-down circuit, which is beneficial to reduce heat generation during work.

[附图说明][Description of drawings]

图1是本案的结构框图。Figure 1 is a structural block diagram of the case.

图2是本案的具体实施电路图之一。Fig. 2 is one of the specific implementation circuit diagrams of this case.

图3是本案的具体实施电路图之二。Fig. 3 is the second of the concrete implementation circuit diagram of this case.

图4是本案的具体实施电路图之三。Fig. 4 is the third of the concrete implementation circuit diagram of this case.

图5是本案的具体实施电路图之四。Fig. 5 is the fourth of the concrete implementation circuit diagram of this case.

[具体实施方式][detailed description]

以下结合附图通过实施例对本发明特征及其它相关特征作进一步详细说明，以便于同行业技术人员的理解：The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

如图1-5所示，一种漏电保护装置的控制电路，包括有顺次连接的用于零火线接入的交流电输入接口1、可复位断开继电器开关2、以及用于零火线输出的交流电输出接口3，所述继电器开关2与交流电输出接口3之间的零火线上设有用于漏电流检测并且在检测到漏电流超过预设值时输出脱扣控制信号的零序电流互感器模块4，所述控制电路还包括有与所述继电器开关2对应的继电器线圈5、以及并联在所述交流电输入接口1上用于向所述继电器线圈5和所述零序电流互感器模块4并列供电的交直流转换模块6，所述交直流转换模块6输出端还并联有受控分流模块7，所述受控分流模块7控制信号输入端与所述零序电流互感器模块4的脱扣控制信号输出端相连接。As shown in Figure 1-5, a control circuit of a leakage protection device includes an AC input interface 1 connected in sequence for the connection of the neutral and live wires, a resettable disconnection relay switch 2, and an output for the neutral and live wires. AC output interface 3, a zero-sequence current transformer module for detecting leakage current and outputting a tripping control signal when the leakage current is detected to exceed a preset value is provided on the neutral line between the relay switch 2 and the AC output interface 3 4. The control circuit also includes a relay coil 5 corresponding to the relay switch 2, and connected in parallel to the AC input interface 1 for paralleling the relay coil 5 and the zero-sequence current transformer module 4 The AC-DC conversion module 6 for power supply, the output end of the AC-DC conversion module 6 is also connected in parallel with a controlled shunt module 7, and the controlled shunt module 7 controls the tripping of the signal input end and the zero-sequence current transformer module 4 connected to the control signal output.

如上所述，本案的工作原理如下：As mentioned above, this case works as follows:

使用时，所述交流电输入接口1接通外部交流电，所述交直流转换模块6进行交直流转换后向所述继电器线圈5和所述零序电流互感器模块4供电，当手动使所述继电器开关2接通时，所述继电器线圈5在所述交直流转换模块6的供电作用下吸住所述继电器开关2而维持其接通；某时若所述零序电流互感器模块4检测到漏电流超过预设值则向输出脱扣控制信号，控制所述受控分流模块7导通进行分流，使得所述继电器线圈5上电流降低而不能维持所述继电器开关2的接通，所述继电器开关2复位断开，实现安全保护控制。When in use, the AC input interface 1 is connected to an external AC power, and the AC-DC conversion module 6 supplies power to the relay coil 5 and the zero-sequence current transformer module 4 after performing AC-DC conversion. When the switch 2 is turned on, the relay coil 5 absorbs the relay switch 2 under the power supply of the AC-DC conversion module 6 to keep it turned on; If the current exceeds the preset value, a tripping control signal is output to control the controlled shunt module 7 to conduct shunting, so that the current on the relay coil 5 decreases and cannot maintain the connection of the relay switch 2, and the relay Switch 2 is reset and disconnected to realize safety protection control.

如上所述，具体实施时，所述交直流转换模块6包括有压敏电阻MOV、电阻R1、电阻R2A、电阻R2B、二极管D1、二极管D2、电容C1、以及极性电容C2，所述压敏电阻MOV一端作为所述交直流转换模块6一电源输入端与所述交流电输入接口1零线连接端、二极管D1正极、极性电容C2负极相连接后作为所述交直流转换模块6负极电源输出端，所述压敏电阻MOV另一端作为所述交直流转换模块6另一电源输入端与所述交流电输入接口1火线连接端、电阻R1一端相连接，所述电阻R1另一端与所述电阻R2A一端、电容C1一端相连接，所述电阻R2A另一端通过所述电阻R2B与所述二极管D1负极、电容C1另一端、二极管D2正极相连接，所述二极管D2负极与所述极性电容C2正极相连接后作为所述交直流转换模块6正极电源输出端相连接。As mentioned above, during specific implementation, the AC/DC conversion module 6 includes a piezoresistor MOV, a resistor R1, a resistor R2A, a resistor R2B, a diode D1, a diode D2, a capacitor C1, and a polar capacitor C2. One end of the resistor MOV is used as the power input end of the AC-DC conversion module 6 and is connected to the neutral line connection end of the AC input interface 1, the positive pole of the diode D1, and the negative pole of the polarity capacitor C2, and then serves as the negative power supply output of the AC-DC conversion module 6. end, the other end of the varistor MOV is used as the other power input end of the AC-DC conversion module 6 and is connected to the live wire connection end of the AC input interface 1 and one end of the resistor R1, and the other end of the resistor R1 is connected to the resistor R1 One end of R2A is connected to one end of capacitor C1, the other end of the resistor R2A is connected to the cathode of the diode D1, the other end of the capacitor C1, and the anode of the diode D2 through the resistor R2B, and the cathode of the diode D2 is connected to the polarity capacitor C2 After the positive pole is connected, it is connected as the positive power supply output terminal of the AC-DC conversion module 6 .

如上所述，本案交直流转换模块6采用阻容降压电路，其有利于减少工作时的发热。As mentioned above, the AC/DC conversion module 6 in this case adopts a resistance-capacitance step-down circuit, which is beneficial to reduce heat generation during operation.

如上所述，具体实施时，所述受控分流模块7包括有电阻R3、电容C3、以及三端可控硅SCR，所述电阻R3一端作为所述受控分流模块7一电源连接端与所述交直流转换模块6一电源输出端相连接，所述电阻R3另一端与所述三端可控硅SCR正极连接端，所述三端可控硅SCR负极连接端与所述电容C3一端相连接后作为所述受控分流模块7另一电源连接端与所述交直流转换模块6另一电源输出端相连接，所述三端可控硅SCR控制信号输入端与所述电容C3另一端相连接后作为所述受控分流模块7控制信号输入端与所述零序电流互感器模块4的脱扣控制信号输出端相连接。As mentioned above, during specific implementation, the controlled shunt module 7 includes a resistor R3, a capacitor C3, and a triac SCR. The AC-DC conversion module 6 is connected to a power supply output end, the other end of the resistor R3 is connected to the positive terminal of the three-terminal thyristor SCR, and the negative terminal of the three-terminal thyristor SCR is connected to one end of the capacitor C3. After being connected, the other power connection end of the controlled shunt module 7 is connected to the other power output end of the AC-DC conversion module 6, and the control signal input end of the triac SCR is connected to the other end of the capacitor C3 After being connected, it serves as the control signal input terminal of the controlled shunt module 7 and is connected to the tripping control signal output terminal of the zero-sequence current transformer module 4 .

如上所述，具体实施时，所述交流电输入接口1与所述交流电输出接口3之间还连接有用于产生漏电流的测试开关模块8，所述测试开关模块8包括有电阻R8和手动测试开关TEST，所述电阻R8一端与所述交流电输入接口1零线连接端相连接，所述电阻R8另一端通过所述手动测试开关TEST与所述交流电输出接口3火线连接端相连接。As mentioned above, during specific implementation, a test switch module 8 for generating leakage current is also connected between the AC input interface 1 and the AC output interface 3, and the test switch module 8 includes a resistor R8 and a manual test switch TEST, one end of the resistor R8 is connected to the neutral wire connection end of the AC input interface 1, and the other end of the resistor R8 is connected to the live wire connection end of the AC output interface 3 through the manual test switch TEST.

如上所述，在本案的图2-图5中，给出了零序电流互感器模块4的几种不同实施方式，其都是用于漏电流检测，不作为对本案保护范围的限定。As mentioned above, in Figures 2 to 5 of this case, several different implementations of the zero-sequence current transformer module 4 are given, all of which are used for leakage current detection and are not intended to limit the scope of protection of this case.

如上所述，本案保护的是一种漏电保护装置的控制电路，一切与本案结构相同或相近的技术方案都应示为落入本案的保护范围内。As mentioned above, what this case protects is a control circuit of a leakage protection device, and all technical solutions with the same or similar structure as this case shall be deemed to fall within the protection scope of this case.

Claims (4)

1. the control circuit of an earth leakage protective device, it is characterised in that include the friendship accessed for zero live wire being sequentially connected with Stream electricity input interface (1), the relay switch (2) of the disconnection that can reset and the alternating current output interface for zero live wire output (3), zero live wire between described relay switch (2) and alternating current output interface (3) be provided with for leakage current test and The zero sequence current mutual inductor module (4) of output dropout control signal when detecting that leakage current exceedes preset value, described controls electricity Road also includes the relay coil (5) corresponding with described relay switch (2) and is connected in parallel on described alternating current input interface (1) upper for described relay coil (5) and the AC-DC conversion mould of described zero sequence current mutual inductor module (4) power supply side by side Block (6), described AC-DC conversion module (6) outfan is also parallel with controlled diverter module (7), described controlled diverter module (7) Control signal input is connected with the dropout control signal outfan of described zero sequence current mutual inductor module (4).
The control circuit of a kind of earth leakage protective device the most according to claim 1, it is characterised in that described AC-DC conversion Module (6) include varistor MOV, resistance R1, resistance R2A, resistance R2B, diode D1, diode D2, electric capacity C1 and Polar capacitor C2, described varistor MOV one end exchanges with described as described AC-DC conversion module (6) power input As described AC-DC conversion after electricity input interface (1) zero line connects end, diode D1 positive pole, polar capacitor C2 negative pole are connected Module (6) negative power supply outfan, the described varistor MOV other end is as described another power supply of AC-DC conversion module (6) Input is connected end with described alternating current input interface (1) live wire, resistance R1 one end is connected, the described resistance R1 other end and institute Stating resistance R2A one end, electric capacity C1 one end to be connected, the described resistance R2A other end is by described resistance R2B and described diode D1 Negative pole, the electric capacity C1 other end, diode D2 positive pole are connected, and described diode D2 negative pole is connected with described polar capacitor C2 positive pole It is connected as described AC-DC conversion module (6) cathode power supply outfan after connecing.
The control circuit of a kind of earth leakage protective device the most according to claim 1, it is characterised in that described controlled divergent die Block (7) includes resistance R3, electric capacity C3 and triode-thyristor SCR, and described resistance R3 one end is as described controlled diverter module (7) one power connector ends are connected with described AC-DC conversion module (6) power output end, the described resistance R3 other end and institute State triode-thyristor SCR anode connection terminal, after described triode-thyristor SCR negative pole connection end is connected with described electric capacity C3 one end As described another power connector end of controlled diverter module (7) and described another power output end phase of AC-DC conversion module (6) Connect, described triode-thyristor SCR control signal input be connected with the described electric capacity C3 other end after as described controlled point Flow module (7) control signal input is connected with the dropout control signal outfan of described zero sequence current mutual inductor module (4).
4. according to the control circuit of a kind of earth leakage protective device described in claim 1-3 any one, it is characterised in that described The test switch for producing leakage current it is also associated with between alternating current input interface (1) and described alternating current output interface (3) Module (8), described test switch module (8) includes resistance R8 and manual test switch TEST, described resistance R8 one end and institute Stating alternating current input interface (1) zero line connection end to be connected, the described resistance R8 other end switchs TEST by described manual test It is connected end is connected with described alternating current output interface (3) live wire.
CN201610877264.4A 2016-09-30 2016-09-30 A control circuit of a leakage protection device Pending CN106229942A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106773994A (en) * 2017-01-09 2017-05-31 浙江新涛电子科技股份有限公司 The circuit and control method of a kind of SECO PE ground wires

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Publication number Priority date Publication date Assignee Title
CN2387649Y (en) * 1999-08-10 2000-07-12 李多赐 Automatic protective instrument for preventing fraudulent use of electricity
CN101478099A (en) * 2008-01-04 2009-07-08 创奇科技有限公司 Neutral grounding fault creepage protecting plug
CN101834428A (en) * 2010-05-20 2010-09-15 刘昭利 AC mains over-voltage power-off protector
CN102231462A (en) * 2011-04-19 2011-11-02 刘睿刚 Leakage protection plug
CN103311884A (en) * 2013-04-23 2013-09-18 上海良信电器股份有限公司 Non-stick overvoltage and under-voltage protector with leakage protection function
CN206076917U (en) * 2016-09-30 2017-04-05 中山市拓昊电器有限公司 A control circuit of leakage protection switch device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2387649Y (en) * 1999-08-10 2000-07-12 李多赐 Automatic protective instrument for preventing fraudulent use of electricity
CN101478099A (en) * 2008-01-04 2009-07-08 创奇科技有限公司 Neutral grounding fault creepage protecting plug
CN101834428A (en) * 2010-05-20 2010-09-15 刘昭利 AC mains over-voltage power-off protector
CN102231462A (en) * 2011-04-19 2011-11-02 刘睿刚 Leakage protection plug
CN103311884A (en) * 2013-04-23 2013-09-18 上海良信电器股份有限公司 Non-stick overvoltage and under-voltage protector with leakage protection function
CN206076917U (en) * 2016-09-30 2017-04-05 中山市拓昊电器有限公司 A control circuit of leakage protection switch device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106773994A (en) * 2017-01-09 2017-05-31 浙江新涛电子科技股份有限公司 The circuit and control method of a kind of SECO PE ground wires

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