CN207353822U - A kind of household electrical appliance leakage protection circuit - Google Patents
A kind of household electrical appliance leakage protection circuit Download PDFInfo
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- CN207353822U CN207353822U CN201720957967.8U CN201720957967U CN207353822U CN 207353822 U CN207353822 U CN 207353822U CN 201720957967 U CN201720957967 U CN 201720957967U CN 207353822 U CN207353822 U CN 207353822U
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- triode
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- control circuit
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Abstract
The utility model provides a kind of household electrical appliance leakage protection circuit; including control circuit, signal receiving circuit and recommend test circuit; the conducting and shut-off of the control circuit control circuit; when leaking electricity; electric current changes in current transformer primary coil in control circuit, so as to form electric leakage signal, the secondary coil of current transformer receives the electric leakage signal and sends alarm; it can in time remind and switch off control circuit, avoid the person and property loss；Push-pull-detection circuit is additionally provided with, the detection of electrical leakage ability of the leakage protection circuit can be tested, to provide reference in actual use.The utility model 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, have higher application value.
Description
Technical field
It the utility model is related to household electrical appliances safe handling field technology, and in particular to a kind of household electrical appliance leakage protection circuit.
Background technology
With development in science and technology, household electrical appliance integration degree is higher and higher, and function is more and more complete.The problem of following
It is that household electrical appliance internal wiring also becomes increasingly complex.At present, in the market appliance water, such as sanitary equipment, washing machine, inner wire
Road is extremely complex, and the design of scientific and reasonable circuit is also more and more difficult.With the increase of usage time, circuit can be due to following original
Because leaky occurs：(1) after the power cord crust through a long time use of household electrical appliance, 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 housing
Phase vibration friction, causes wire sheath to touch housing after being worn and causes to leak electricity；(3) lead inside electric appliance, connecting line are because of work
Skill is bad, causes the fixed leading wire joint of wrapping exposed and leaks electricity.There is no interlock circuit to carry out appropriate electric leakage in circuit pre-
It is alert, electric leakage can be made to cause any property loss, even the serious consequence such as personal injury.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is to provide a kind of household electrical appliance leakage protection circuit,
Electric leakage signal can be detected in time, and sends alarm, improve the safety coefficient that household electrical appliances use.
To realize above-mentioned technique effect, a kind of household electrical appliance leakage protection circuit provided by the utility model, including control
Circuit 1 processed and signal receiving circuit 2, the signal receiving circuit 2 receive the electric leakage signal of control circuit 1 and send alarm
Signal, the control circuit 1 include current transformer TA, double-contact relay J1 and varistor Rv, the L lines of alternating current and
N lines connect by primary coil L1, L2 of the current transformer TA and two contacts of the double-contact relay J1 respectively
Connect load；Varistor RvIt is parallel between two contacts of double-contact relay J1；The signal receiving circuit 2 includes capacitance
C8, resistance R3 and R10 and diode D8 and D9, secondary transformer coil L3 one end ground connection；The capacitance C8, resistance
R3, resistance R10, diode D8, diode D9 are parallel to secondary transformer coil L3 both ends, wherein diode D8 successively
Cathode, diode D9 plus earth；Diode D9 cathodes are leakage-current alarm signal output part.
As further improvement of the utility model：
Push-pull-detection circuit 3 is further included, the push-pull-detection circuit 3 includes NPN triode Q2, Q3 and PNP triode
Q4, triode Q2 base stages are input terminal through resistance R27, its collector is through resistance R25 connection supply voltages, its emitter ground connection；
Triode Q3 collectors are connected through resistance R26 connection supply voltages, its emitter with triode Q4 emitters；Triode Q4 current collections
Pole is grounded through resistance R22；The base stage of triode Q3 is connected through resistance R23 with triode Q2 collectors；Triode Q4 base stages are through electricity
Resistance R24 is connected with triode Q2 collectors；The cathode of the emitter connection electrolytic capacitor E1 of triode Q3, electrolytic capacitor E1's
Ground terminal of the anode through secondary transformer coil L4 connection secondary transformer coils L3.
From above technical scheme, a kind of household electrical appliance leakage protection circuit provided by the utility model, signal connects
The electric leakage signal of control circuit side can be sensed in time by current transformer by receiving circuit, and send alarm signal, and electric current is mutual
Sensor will can be AC electrically isolated from, and improve the safety of circuit；Push-pull-detection circuit is additionally provided with, leakage protection circuit can be detected
Earth detection ability, the reliability that the leakage protection circuit uses can be improved.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：
As shown in Figure 1, household electrical appliance leakage protection circuit in the present embodiment, including control circuit 1, signal receiving circuit 2,
Preferably, the leakage protection circuit in the present embodiment further includes push-pull-detection circuit 3, control circuit 1 controls alternating current with bearing
The connection of load, signal receiving circuit 2 receives the electric leakage signal in control circuit, and sends alarm signal in time；Recommend test electricity
Road 3 can be protected with the alarm signal threshold value of test signal receiving circuit and the working status of detection signal receiving circuit for electric leakage
The use reliability of protection circuit provides reference.
Specifically, control circuit 1 includes current transformer TA, double-contact relay J1 and varistor Rv, exchange
Two contact portions of primary coil L1, L2 Jing Guo current transformer TA and relay load respectively for electric L lines and N lines；Pressure
Quick resistance RvIt is parallel between two contacts of relay, protection can be provided to successive load；Relay can be exported by chip
Signal control conducting and shut-off, supply voltage is+12V.
Signal receiving circuit 2 includes capacitance C8, resistance R3 and R10 and diode D8 and D9, secondary transformer line
Enclose L3 one end ground connection；Capacitance C8, resistance R3, resistance R10, diode D8, diode D9 are parallel to secondary transformer successively
Coil L3 both ends, the wherein plus earth of the cathode of diode D8, diode D9；Diode D9 cathodes are defeated for leakage-current alarm signal
Outlet.Wherein, C8 and R3, R10 composition low-pass filter circuit, prevent erroneous judgement, diode D8 and D9 play guarantor by noise-filtering
Die terminals effect is protected, prevents transient voltage is excessive from puncturing chip.The effect of signal receiving circuit is the electric leakage that primary occurs
Signal, by the coupling of primary and secondary coil L3, becomes the electric leakage signal at LEAKAGECUR ends, so as to reach detection effect.
Push-pull-detection circuit 3 includes NPN triode Q2, Q3 and PNP triode Q4, and triode Q2 base stages are through resistance R27
For input terminal, its collector is through resistance R25 connection supply voltages, its emitter ground connection；Triode Q3 collectors connect through resistance R26
Supply voltage is connect, its emitter is connected with triode Q4 emitters；Triode Q4 collectors are grounded through resistance R22；Triode Q3
Base stage be connected through resistance R23 with triode Q2 collectors；Triode Q4 base stages are through resistance R24 and triode Q2 collector phases
Even；The cathode of the emitter connection electrolytic capacitor E1 of triode Q3, secondary of the anode of electrolytic capacitor E1 through current transformer TA
The ground terminal of coil L4 connection secondary transformer coils L3.The effect of push-pull-detection circuit be will test square wave signal from
LEAKCTEST ends are sent, and the push-pull circuit being made up of Q2, Q3, Q4 and all resistance carries out amplitude amplification, 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, so as to detect earth detection ability.
The utility model can promptly and accurately detect electric leakage signal, and send alarm, and one kind is proposed for earth leakage protective
New circuit design, detection is accurate, timely, and can extend connection related controller, disconnects the connection of control circuit in time, real
The earth leakage protective intelligence of existing household electrical appliance.The utility model has good application value and promotion prospect.
Embodiment described above is only that the preferred embodiment of the utility model is described, not to this practicality
New scope is defined, and on the premise of the spirit of the design of the utility model is not departed from, those of ordinary skill in the art are to this
The various modifications and improvement that the technical solution of utility model is made, should all fall into the protection that the utility model claims book determines
In the range of.
Claims (2)
- A kind of 1. 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 sends alarm signal, control circuit (1) bag Include current transformer TA, double-contact relay J1 and varistor Rv, the L lines and N lines of alternating current pass through the electric current respectively Two contact portions of primary coil L1, L2 of mutual inductor TA and the double-contact relay J1 load；Varistor RvAnd It is coupled between two contacts of double-contact relay J1；The signal receiving circuit (2) include capacitance C8, resistance R3 and R10 with And diode D8 and D9, secondary transformer coil L3 one end ground connection；The capacitance C8, resistance R3, resistance R10, diode D8, diode D9 are parallel to secondary transformer coil L3 both ends, the wherein cathode of diode D8, the sun of diode D9 successively Pole is grounded；Diode D9 cathodes are leakage-current alarm signal output part.
- 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 stages are through resistance R27 is input terminal, its collector is through resistance R25 connection supply voltages, its emitter ground connection；Triode Q3 collectors are through resistance R26 connection supply voltages, its emitter are connected with triode Q4 emitters；Triode Q4 collectors are grounded through resistance R22；Three poles The base stage of pipe Q3 is connected through resistance R23 with triode Q2 collectors；Triode Q4 base stages are through resistance R24 and triode Q2 collectors It is connected；The cathode of the emitter connection electrolytic capacitor E1 of triode Q3, the anode of electrolytic capacitor E1 is through secondary transformer line Enclose the ground terminal of L4 connection secondary transformer coils L3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720957967.8U CN207353822U (en) | 2017-08-02 | 2017-08-02 | A kind of household electrical appliance leakage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720957967.8U CN207353822U (en) | 2017-08-02 | 2017-08-02 | A kind of household electrical appliance leakage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207353822U true CN207353822U (en) | 2018-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720957967.8U Active CN207353822U (en) | 2017-08-02 | 2017-08-02 | A kind of household electrical appliance leakage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207353822U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390906A (en) * | 2017-08-02 | 2019-02-26 | 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 CN201720957967.8U patent/CN207353822U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390906A (en) * | 2017-08-02 | 2019-02-26 | 惠而浦（中国）股份有限公司 | A kind of household electrical appliance leakage protection circuit |
| CN109390906B (en) * | 2017-08-02 | 2024-02-09 | 惠而浦（中国）股份有限公司 | Leakage protection circuit for household appliances |
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