CN105403756A - Circuit device having ground wire live detection function - Google Patents

Circuit device having ground wire live detection function Download PDF

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Publication number
CN105403756A
CN105403756A CN201510831845.XA CN201510831845A CN105403756A CN 105403756 A CN105403756 A CN 105403756A CN 201510831845 A CN201510831845 A CN 201510831845A CN 105403756 A CN105403756 A CN 105403756A
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China
Prior art keywords
electric capacity
power supply
scr
controllable silicon
end pin
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CN201510831845.XA
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CN105403756B (en
Inventor
罗永任
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FOSHAN SHUNDE AOJUN ELECTRONIC TECHNOLOGY Co Ltd
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FOSHAN SHUNDE AOJUN ELECTRONIC TECHNOLOGY Co Ltd
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Abstract

The invention relates to a circuit device having a ground wire live detection function. The circuit device comprises a power supply circuit, a level signal control circuit, and a high-level and low-level switching circuit. When a voltage difference between the ground (an E wire) and a zero line is larger than over 50 VAC, a voltage is triggered by series connection of a fifth capacitor (C5) and a third current-limiting resistor (R3) to a G electrode of a silicon controlled rectifier (SCR) and the SCR is conducted; and then the voltage is outputted to an OUT port by a switching diode (D2), so that the level state of the OUT port to a power ground (GND) is changed from the low level state to the high level state. On the basis of the structure, a detection circuit only includes the fifth capacitor C5, the third current-limiting resistor (R3), and a filter third capacitor C3 and less components are used; and the level switching circuit includes the silicon controlled rectifier (SCR), a switching diode D2, a capacitor C2, and the filter third capacitor C3. Therefore, the number of components is reduced; the structure is simple; and the cost is low.

Description

A kind of circuit arrangement with ground wire electrification detection function
Technical field
The present invention relates to a kind of earth wire charged testing device of household electrical appliance.
Background technology
Currently available technology, a kind of circuit arrangement with ground wire electrification detection function it comprise power circuit, level signal control circuit and low and high level commutation circuit.Existing problems are: complex structure, and cost is high, and assembling is inconvenient.
Summary of the invention
The object of the invention is: provide a kind of circuit arrangement with ground wire electrification detection function, it is simple that it has structure, the feature that cost is low and easy to assembly.
The present invention is achieved in that a kind of circuit arrangement with ground wire electrification detection function, it is characterized in that: it comprises power circuit, level signal control circuit and low and high level commutation circuit,
Described power circuit receives zero line through voltage stabilizing diode ZD1 by phase line after commutation diode D1 and the first current-limiting resistance R1 contacts, and the power supply after voltage stabilizing meets power supply ground GND by first capacitor C1 one end pin, other end pin meets power vd D and power supply is carried out filtering;
Described level signal control circuit meets power vd D by second current-limiting resistance R2 one end pin, other end pin is connected with the A pole of controllable silicon SCR, the K pole of controllable silicon SCR is connected with one end pin of the 3rd electric capacity C3 of filtering, and the 3rd electric capacity C3 other end pin of filtering meets power supply ground GND;
Low and high level commutation circuit: be the G pole that the 5th electric capacity C5 that closed through lotus root by the earth E line and the 3rd current-limiting resistance R3 are connected to controllable silicon SCR, filter one end pin of the 4th electric capacity C4 of making an uproar by parallel connection to be connected with the G pole of controllable silicon SCR, GND is connected and carries out making an uproar anti-interference to the filter of controllable silicon SCR with filtering the other end pin of the 4th electric capacity C4 of making an uproar and power supply, be connected to by the A pole of switching diode D2 again and carry out level signal between the K pole of controllable silicon SCR and the 3rd electric capacity C3 of filtering and detect and export, second electric capacity C2 is and is connected in the filter capacitor between output port OUT and power supply ground GND,
Be by the earth E line relative to exist between zero line voltage difference be greater than more than 50VAC time, the G pole that voltage is connected to controllable silicon SCR through the 5th electric capacity C5 and the 3rd current-limiting resistance R3 is triggered, controllable silicon SCR conducting, go here and there again and output to OUT port by switching diode D2, make OUT port be high level state to the level state of power supply ground GND by low transition.
Described a kind of circuit arrangement with ground wire electrification detection function, its special character is: also comprise the second voltage stabilizing diode ZD2, and the 4th electric capacity C4 that the second voltage stabilizing diode ZD and described filter are made an uproar is in parallel.
A kind of circuit arrangement with ground wire electrification detection function of the present invention, owing to adopting such structure, 3rd electric capacity C3 parts of testing circuit the 5th electric capacity C5, the 3rd current-limiting resistance R3 and filtering are few, level switching circuit is made up of the 3rd electric capacity C3 of controllable silicon SCR, switching diode D2, the second electric capacity C2 and filtering, therefore parts of the present invention are few, structure is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of circuit arrangement with ground wire electrification detection function, is characterized in that: it comprises power circuit, level signal control circuit and low and high level commutation circuit,
Described power circuit receives zero line N through voltage stabilizing diode ZD1 by phase line L after commutation diode D1 and the first current-limiting resistance R1 contacts, and the power supply after voltage stabilizing meets power supply ground GND by first capacitor C1 one end pin, other end pin meets power vd D and power supply is carried out filtering;
Described level signal control circuit meets power vd D by second current-limiting resistance R2 one end pin, other end pin is connected with the A pole of controllable silicon SCR, the K pole of controllable silicon SCR is connected with one end pin of the 3rd electric capacity C3 of filtering, and the 3rd electric capacity C3 other end pin of filtering meets power supply ground GND;
Low and high level commutation circuit: be the G pole that the 5th electric capacity C5 that closed through lotus root by geodesic line E and the 3rd current-limiting resistance R3 are connected to controllable silicon SCR, filter one end pin of the 4th electric capacity C4 of making an uproar by parallel connection to be connected with the G pole of controllable silicon SCR, GND is connected and carries out making an uproar anti-interference to the filter of controllable silicon SCR with filtering the other end pin of the 4th electric capacity C4 of making an uproar and power supply, be connected to by the A pole of switching diode D2 again and carry out level signal between the K pole of controllable silicon SCR and the 3rd electric capacity C3 of filtering and detect and export, second electric capacity C2 is and is connected in the filter capacitor between output port OUT and power supply ground GND,
Be by the earth E line relative to exist between zero line N voltage difference be greater than more than 50VAC time, the G pole that voltage is connected to controllable silicon SCR through the 5th electric capacity C5 and the 3rd current-limiting resistance R3 is triggered, controllable silicon SCR conducting, go here and there again and output to OUT port by switching diode D2, make OUT port be high level state to the level state of power supply ground GND by low transition.
As further improvement:: also comprise the second voltage stabilizing diode ZD2, the 4th electric capacity C4 that the second voltage stabilizing diode ZD and described filter are made an uproar is in parallel.
During use, the level state of this output terminal OUT can realize sound and light alarm and switch of cutting off the electricity supply through single-chip microcomputer process simultaneously, can avoid injures and deaths of leaking electricity more in time.
Above-described is only preferred embodiments of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the principles of the present invention, can also make some improvement and modification, this is also considered as protection scope of the present invention.

Claims (2)

1. there is a circuit arrangement for ground wire electrification detection function, it is characterized in that: it comprises power circuit, level signal control circuit and low and high level commutation circuit,
Described power circuit receives zero line through voltage stabilizing diode (ZD1) by phase line after commutation diode (D1) and the first current-limiting resistance (R1) are contacted, and by the first capacitor (C1) one end pin, (GND), other end pin connect power supply (VDD) and power supply is carried out filtering the power supply after voltage stabilizing with connecing power supply;
Described level signal control circuit connects power supply (VDD) by the second current-limiting resistance (R2) one end pin, other end pin is connected with the A pole of controllable silicon (SCR), the K pole of controllable silicon (SCR) is connected with one end pin of the 3rd electric capacity (C3) of filtering, and the 3rd electric capacity (C3) other end pin of filtering with connecing power supply (GND);
Low and high level commutation circuit: be that the 5th electric capacity (C5) that closed through lotus root by geodesic line (E) is connected to the G pole of controllable silicon (SCR) with the 3rd current-limiting resistance (R3), one end pin being filtered the 4th electric capacity (C4) of making an uproar by parallel connection is connected with the G pole of controllable silicon (SCR), the other end pin filtering the 4th electric capacity (C4) of making an uproar is connected with power supply ground (GND) filter carried out controllable silicon (SCR) and makes an uproar anti-interference, be connected to by the A pole of switching diode (D2) again and carry out level signal between the K pole of controllable silicon (SCR) and the 3rd electric capacity (C3) of filtering and detect and export, second electric capacity (C2) is and is connected in the filter capacitor between output port (OUT) and power supply ground (GND),
Be by the earth (E line) relative to exist between zero line voltage difference be greater than more than 50VAC time, the G pole that voltage is connected to controllable silicon (SCR) through the 5th electric capacity (C5) and the 3rd current-limiting resistance (R3) is triggered, controllable silicon (SCR) conducting, go here and there again and output to OUT port by switching diode (D2), make OUT port to power supply the level state of (GND) be high level state by low transition.
2. a kind of circuit arrangement with ground wire electrification detection function according to claim 1, is characterized in that: also comprise the second voltage stabilizing diode (ZD2), and the 4th electric capacity (C4) that the second voltage stabilizing diode (ZD2) and described filter are made an uproar is in parallel.
CN201510831845.XA 2015-11-25 2015-11-25 A kind of circuit arrangement with ground wire electrification detection function Active CN105403756B (en)

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CN105403756B CN105403756B (en) 2018-01-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958439A (en) * 2016-05-30 2016-09-21 深圳市良辉科技有限公司 Leakage protection device having ground wire live-line indication function

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CN104466896A (en) * 2013-09-18 2015-03-25 成都昊地科技有限责任公司 Electric appliance multipurpose protective device
CN104898015A (en) * 2015-06-27 2015-09-09 佛山市顺德万和电气配件有限公司 Alternating-current null-line and firing-line reverse connection and ground line abnormality detection circuit
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CN2845263Y (en) * 2005-08-01 2006-12-06 梁文起 The security appliance protective device
US20080123227A1 (en) * 2006-06-30 2008-05-29 Leviton Manufacturing Company, Inc. Circuit interrupter with live ground detector
CN102890184A (en) * 2012-10-25 2013-01-23 德讯科技股份有限公司 Optocoupler-based zero passage detecting circuit
CN104466896A (en) * 2013-09-18 2015-03-25 成都昊地科技有限责任公司 Electric appliance multipurpose protective device
CN104332946A (en) * 2014-11-13 2015-02-04 陈泽 Ground fault protecting circuit and ground fault breaker
CN104898015A (en) * 2015-06-27 2015-09-09 佛山市顺德万和电气配件有限公司 Alternating-current null-line and firing-line reverse connection and ground line abnormality detection circuit
CN205280807U (en) * 2015-11-25 2016-06-01 佛山市顺德区澳骏电子科技有限公司 Circuit arrangement with electrification of ground wire detects function

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958439A (en) * 2016-05-30 2016-09-21 深圳市良辉科技有限公司 Leakage protection device having ground wire live-line indication function

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