CN109390906A - A kind of household electrical appliance leakage protection circuit - Google Patents
A kind of household electrical appliance leakage protection circuit Download PDFInfo
- Publication number
- CN109390906A CN109390906A CN201710653616.2A CN201710653616A CN109390906A CN 109390906 A CN109390906 A CN 109390906A CN 201710653616 A CN201710653616 A CN 201710653616A CN 109390906 A CN109390906 A CN 109390906A
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- triode
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- diode
- control circuit
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- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of household electrical appliance leakage protection circuit; including control circuit, signal receiving circuit and recommend test circuit; the conducting and shutdown of the control circuit control circuit; when leaking electricity; electric current changes in current transformer primary coil in control circuit, to form electric leakage signal, the secondary coil of current transformer receives the electric leakage signal and issues alarm; it can remind and switch off control circuit in time, avoid the person and property loss；Be additionally provided with push-pull-detection circuit, can the detection of electrical leakage ability to the leakage protection circuit test, for actual use in reference is provided.The present invention can accurately detect the electric leakage signal in household electrical appliances use, improve the safety coefficient that household electrical appliances use, it is ensured that the person and property safety, application value with higher.
Description
Technical field
The present invention relates to household electrical appliances to use field technology safely, and in particular to a kind of household electrical appliance leakage protection circuit.
Background technique
With development in science and technology, household electrical appliance integration degree is higher and higher, and function is more and more complete.Following problem
It is that household electrical appliance internal wiring also becomes increasingly complex.Currently, using appliance water, such as sanitary equipment, washing machine, inner wire in the market
Road is extremely complex, and scientific and reasonable route design is also more and more difficult.With the increase for using the time, route can be due to following original
Because leaky occurs: (1) the power supply line crust through a long time use of household electrical appliance after, there are worn-off or exposed conducting wire, these
The conducting wire of naked leakage once contacts shell or other metal positions will result in electric leakage；(2) length between machine lead and shell
Phase vibration friction, touches shell and causes to leak electricity after causing wire sheath to be worn；(3) lead inside electric appliance, connecting line are because of work
Skill is bad, and the leading wire joint for causing wrapping fixed is exposed and leaks electricity.There is no interlock circuit to carry out electric leakage appropriate in circuit pre-
It is alert, electric leakage can be made to cause any property loss, even the serious consequences such as personal injury.
Summary of the invention
It, can be in order to solve the above technical problems, the purpose of the present invention is to provide a kind of household electrical appliance leakage protection circuit
It detects electric leakage signal in time, and issues alarm, improve the safety coefficient that household electrical appliances use.
In order to realize the above technical effect, a kind of household electrical appliance leakage protection circuit provided by the present invention, including control electricity
Road 1 and signal receiving circuit 2, the signal receiving circuit 2 receive the electric leakage signal of control circuit 1 and issue alarm signal,
The control circuit 1 includes current transformer TA, double-contact relay J1 and varistor, and the alternating current L line and N line divide
Not Jing Guo current transformer TA primary coil L1, L2 and relay two contacts connect load；Varistor is parallel to
Between two contacts of relay；The signal receiving circuit 2 include capacitor C8, resistance R3 and R10 and diode D8 and
D9, secondary transformer one end coil L3 ground connection；The capacitor C8, resistance R3, resistance R10, diode D8, diode D9 according to
It is secondary to be parallel to the both ends secondary transformer coil L3, the wherein plus earth of the cathode of diode D8, diode D9；Diode
D9 cathode is leakage-current alarm signal output end.
As a further improvement of the present invention:
It further include push-pull-detection circuit 3, the push-pull-detection circuit 3 includes NPN triode Q2, Q3 and PNP triode Q4, and three
Pole pipe Q2 base stage is input terminal through resistance R27, and collector is through resistance R25 connection supply voltage, emitter ground connection；Triode
Q3 collector is connected through resistance R26 connection supply voltage, emitter with triode Q4 emitter；Triode Q4 collector is through electricity
Hinder R22 ground connection；The base stage of triode Q3 is connected through resistance R23 with triode Q2 collector；Triode Q4 base stage through resistance R24 with
Triode Q2 collector is connected；The anode of the emitter connection electrolytic capacitor E1 of triode Q3, the cathode of electrolytic capacitor E1 is through electricity
The ground terminal of current transformer secondary coil L4 connection secondary transformer coil L3.
From the above technical scheme, a kind of household electrical appliance leakage protection circuit provided by the present invention, signal receive electricity
Road can sense in time the electric leakage signal of control circuit side by current transformer, and issue alarm signal, current transformer
It can will be AC electrically isolated from, and improve the safety of circuit；It is additionally provided with push-pull-detection circuit, is able to detect the leakage of leakage protection circuit
The reliability that the leakage protection circuit uses can be improved in electrical inspection ability.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
As shown in Figure 1, household electrical appliance leakage protection circuit in the present embodiment, including control circuit 1, signal receiving circuit 2, as
It is preferred that the leakage protection circuit in the present embodiment further includes push-pull-detection circuit 3, control circuit 1 controls alternating current and load
Connection, signal receiving circuit 2 receives the electric leakage signal in control circuit, and issues alarm signal in time；Recommending test circuit 3 can
It is leakage protection circuit to test the alarm signal threshold value of signal receiving circuit and detect the working condition of signal receiving circuit
Use reliability provide reference.
Specifically, control circuit 1 includes current transformer TA, double-contact relay J1 and varistor, alternating current L
Line connects load with two contacts of primary coil L1, L2 and relay that N line passes through current transformer TA respectively；Pressure-sensitive electricity
Resistance is parallel between two contacts of relay, can provide protection to successive load；Relay can be by chip signal output control
System conducting and shutdown, supply voltage are+12V.
Signal receiving circuit 2 includes capacitor C8, resistance R3 and R10 and diode D8 and D9, secondary transformer line
Enclose the one end L3 ground connection；Capacitor C8, resistance R3, resistance R10, diode D8, diode D9 are successively parallel to secondary transformer
The both ends coil L3, the wherein plus earth of the cathode of diode D8, diode D9；Diode D9 cathode is that leakage-current alarm signal is defeated
Outlet.Wherein, C8 and R3, R10 form low-pass filter circuit, noise-filtering are prevented erroneous judgement, diode D8 and D9 play guarantor
Die terminals effect is protected, prevents transient voltage is excessively high from puncturing chip.The effect of signal receiving circuit is the electric leakage that primary occurs
Signal becomes the electric leakage signal at the end LEAKAGECUR by the coupling of primary and secondary coil L3, to reach detection effect.
Push-pull-detection circuit 3 includes NPN triode Q2, Q3 and PNP triode Q4, and triode Q2 base stage is through resistance R27
For input terminal, collector is through resistance R25 connection supply voltage, emitter ground connection；Triode Q3 collector connects through resistance R26
Supply voltage is connect, emitter is connected with triode Q4 emitter；Triode Q4 collector is grounded through resistance R22；Triode Q3
Base stage be connected through resistance R23 with triode Q2 collector；Triode Q4 base stage is through resistance R24 and triode Q2 collector phase
Even；The anode of the emitter connection electrolytic capacitor E1 of triode Q3, the cathode of electrolytic capacitor E1 is through the secondary of current transformer TA
The ground terminal of coil L4 connection secondary transformer coil L3.The effect of push-pull-detection circuit be will test square wave signal from
The end LEAKCTEST issues, and carries out amplitude amplification by the push-pull circuit that Q2, Q3, Q4 and all resistance form, become to be not easy by
The signal of interference becomes weak AC signal by the filtering of electrolytic capacitor, simulates drain conditions, pass through secondary transformer line
Circle L4 is coupled to the ground terminal of secondary transformer coil L3, becomes alarm signal, to detect earth detection ability.
The present invention can promptly and accurately detect electric leakage signal, and issue alarm, be that earth leakage protective proposes one kind newly
Circuit design, detection is accurate, timely, and can extend connection related controller, disconnects the connection of control circuit in time, realizes house
The earth leakage protective intelligence of electrical appliance.The present invention has good application value and promotion prospect.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (2)
1. a kind of household electrical appliance leakage protection circuit, it is characterised in that: including control circuit (1) and signal receiving circuit (2),
The signal receiving circuit (2) receives the electric leakage signal of control circuit (1) and issues alarm signal, control circuit (1) packet
Current transformer TA, double-contact relay J1 and varistor are included, the alternating current L line and N line pass through Current Mutual Inductance respectively
Primary coil L1, L2 of device TA and two contacts of relay connect load；Varistor is parallel to two touchings of relay
Between point；The signal receiving circuit (2) includes capacitor C8, resistance R3 and R10 and diode D8 and D9, current transformer
The one end secondary coil L3 ground connection；The capacitor C8, resistance R3, resistance R10, diode D8, diode D9 are successively parallel to electric current
The both ends transformer secondaries L3, the wherein plus earth of the cathode of diode D8, diode D9；Diode D9 cathode is electric leakage
Alarm signal output ends.
2. household electrical appliance leakage protection circuit according to claim 1, it is characterised in that: further include push-pull-detection circuit
(3), the push-pull-detection circuit (3) includes NPN triode Q2, Q3 and PNP triode Q4, and triode Q2 base stage is through resistance
R27 is input terminal, and collector is through resistance R25 connection supply voltage, emitter ground connection；Triode Q3 collector is through resistance
R26 connection supply voltage, emitter are connected with triode Q4 emitter；Triode Q4 collector is grounded through resistance R22；Three poles
The base stage of pipe Q3 is connected through resistance R23 with triode Q2 collector；Triode Q4 base stage is through resistance R24 and triode Q2 collector
It is connected；The anode of the emitter connection electrolytic capacitor E1 of triode Q3, the cathode of electrolytic capacitor E1 is through secondary transformer line
Enclose the ground terminal of L4 connection secondary transformer coil L3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710653616.2A CN109390906B (en) | 2017-08-02 | 2017-08-02 | Leakage protection circuit for household appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710653616.2A CN109390906B (en) | 2017-08-02 | 2017-08-02 | Leakage protection circuit for household appliances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109390906A true CN109390906A (en) | 2019-02-26 |
| CN109390906B CN109390906B (en) | 2024-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710653616.2A Active CN109390906B (en) | 2017-08-02 | 2017-08-02 | Leakage protection circuit for household appliances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109390906B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983505A (en) * | 2019-05-06 | 2020-11-24 | 江苏新安电器股份有限公司 | Washing machine electric leakage detection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488657A (en) * | 2009-02-23 | 2009-07-22 | 深圳创维－Rgb电子有限公司 | Detection and protection apparatus for leakage |
| CN201868846U (en) * | 2010-12-07 | 2011-06-15 | 合肥荣事达三洋电器股份有限公司 | Earth-leakage protection controller |
| CN103326325A (en) * | 2013-06-05 | 2013-09-25 | 广州凯盛电子科技有限公司 | Short-circuit and low-voltage protective circuit of output of switching power source |
| CN104993451A (en) * | 2015-08-03 | 2015-10-21 | 刘圣平 | Very effective leakage protector |
| CN205489453U (en) * | 2016-01-04 | 2016-08-17 | 广州金田瑞麟净化设备制造有限公司 | Leakage protective circuit |
| CN207353822U (en) * | 2017-08-02 | 2018-05-11 | 惠而浦（中国）股份有限公司 | A kind of household electrical appliance leakage protection circuit |
-
2017
- 2017-08-02 CN CN201710653616.2A patent/CN109390906B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488657A (en) * | 2009-02-23 | 2009-07-22 | 深圳创维－Rgb电子有限公司 | Detection and protection apparatus for leakage |
| CN201868846U (en) * | 2010-12-07 | 2011-06-15 | 合肥荣事达三洋电器股份有限公司 | Earth-leakage protection controller |
| CN103326325A (en) * | 2013-06-05 | 2013-09-25 | 广州凯盛电子科技有限公司 | Short-circuit and low-voltage protective circuit of output of switching power source |
| CN104993451A (en) * | 2015-08-03 | 2015-10-21 | 刘圣平 | Very effective leakage protector |
| CN205489453U (en) * | 2016-01-04 | 2016-08-17 | 广州金田瑞麟净化设备制造有限公司 | Leakage protective circuit |
| CN207353822U (en) * | 2017-08-02 | 2018-05-11 | 惠而浦（中国）股份有限公司 | A kind of household electrical appliance leakage protection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983505A (en) * | 2019-05-06 | 2020-11-24 | 江苏新安电器股份有限公司 | Washing machine electric leakage detection system |
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| Publication number | Publication date |
|---|---|
| CN109390906B (en) | 2024-02-09 |
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