CN204651887U - A kind of detection of electrical leakage and protective circuit - Google Patents
A kind of detection of electrical leakage and protective circuit Download PDFInfo
- Publication number
- CN204651887U CN204651887U CN201520278277.0U CN201520278277U CN204651887U CN 204651887 U CN204651887 U CN 204651887U CN 201520278277 U CN201520278277 U CN 201520278277U CN 204651887 U CN204651887 U CN 204651887U
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- operational amplifier
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- chip microcomputer
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- 230000001681 protective effect Effects 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 14
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000005406 washing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a kind of detection of electrical leakage and protective circuit, belongs to Electronic Control and daily life technical field.The utility model comprises Signal Collection and amplify device, rectifier filter, A/D converter, single-chip microcomputer, liquid crystal display 5, relay, voltage stabilizing circuit; Described Signal Collection and amplify device is connected with rectifier filter, and rectifier filter is connected with A/D converter, and A/D converter is connected with single-chip microcomputer, and single-chip microcomputer is connected with relay with liquid crystal display, and voltage stabilizing circuit is connected with Signal Collection and amplify device.The utility model is applied widely, practical; Accuracy of detection is high, and this electric circuit inspection precision is 0.02mA; Intuitively can show leakage current; Safety; Energy-conservation.
Description
Technical field
The utility model relates to a kind of detection of electrical leakage and protective circuit, belongs to Electronic Control and daily life technical field.
Background technology
Although earth leakage protective device all installed by existing most of residential building, and Zheng Zhuan building can be caused to have a power failure when there is electric leakage, can widen one's influence area, affects other normal users electricity consumptions.If install protective circuit after each household ammeter, electric leakage user only can be made to have a power failure and not affect other users when there is electric leakage accident.This circuit can also be used for various household electrical appliance, and our life now all be unable to do without electrical equipment, often can cause power-off because of indivedual apparatus failure.Such as: washing machine, water heater, electric cooker etc.Washing machine, after service life is long, even if joint safety, also can damages because of internal wiring ageing of insulation and cause electric leakage, and in laundry processes, contacts water greatly can increase electric shock possibility, and general family expenses protection switch can not be made a response and cut off whole circuit.Use this protective circuit automatically can cut off washing machine when generation electric leakage power and do not affect the use of other electrical appliances; Water heater, electric cooker cause human electric shock possibly when leaking electricity equally, damage, and use protective circuit can adding users Electrical Safety greatly, and prevent leaky from existing, thus save electric energy.And this protective circuit can not affect the normal use of electrical equipment when electrical equipment is normal.This leakage protection circuit can adjust electric leakage permissible value according to actual needs, makes protective circuit cut off electric current when leakage current reaches set definite value.
Summary of the invention
The utility model provides a kind of detection of electrical leakage and protective circuit, for the problem of carrying out in time detecting and protecting when solving and electric leakage occurs.
The technical solution of the utility model is: a kind of detection of electrical leakage and protective circuit, comprises Signal Collection and amplify device 1, rectifier filter 2, A/D converter 3, single-chip microcomputer 4, liquid crystal display 5, relay 6, voltage stabilizing circuit 7;
Described Signal Collection and amplify device 1 is connected with rectifier filter 2, and rectifier filter 2 is connected with A/D converter 3, and A/D converter 3 is connected with single-chip microcomputer 4, and single-chip microcomputer 4 is connected with relay 6 with liquid crystal display 5, and voltage stabilizing circuit 7 is connected with Signal Collection and amplify device 1.
The resistance R1 two ends of described Signal Collection and amplify device 1 are connected with the vice-side winding of current transformer, one end of electric capacity C1 other end that is connected with resistance R1 is connected with the other end of resistance R1, one end of resistance R2 is connected with electric capacity C1 one end, the other end is connected with operational amplifier T1 inverting input, one end of resistance R3 is connected with the electric capacity C1 other end, the other end is connected with the in-phase input end of operational amplifier T1, and the two ends of resistance R4 receive inverting input and the output of operational amplifier T1 respectively;
The output other end connecting resistance R5 of the electric capacity C2 mono-termination operational amplifier T1 of rectifier filter 2, the other end ground connection of resistance R5, the one termination capacitor C2 other end connecting resistance R6 of diode D1, resistance R7 receives the other end of resistance R6 and the in-phase input end of operational amplifier T2 respectively, the negative terminal other end connecting resistance R8 of electric capacity C3 mono-terminating diode D1, electric capacity C4 receives one end of resistance R6 and resistance R8 respectively, electric capacity C5 mono-terminating resistor R7 other end connecting resistance R8, the inverting input of another termination operational amplifier T2 of resistance R8, resistance R9 connects inverting input and the output of operational amplifier T2 respectively,
A/D converter 3 receives the output of operational amplifier T2; Resistance R10 mono-terminating diode D2 mono-termination power of voltage stabilizing circuit 7, a terminating resistor R3 other end ground connection of diode D2.
The course of work of the present utility model is:
Current transformer is sampled to electric current and the current signal collected is converted to digital signal sends to single-chip microcomputer 4 through the signal after amplifying being delivered to A/D converter 3 after Signal Collection and amplify device 1 carries out signal amplification; liquid crystal display 5 pairs of leakage currents show; single-chip microcomputer 4 detects leakage current in real time and whether is greater than set point; if be greater than set point; single-chip microcomputer 4 sends the signal of cut-out circuit to relay 6; electric current is cut off in relay 6 action, thus the protection of realizing circuit, wait Awaiting Overhaul.
Wherein, " designing based on the automatic temperature-controlling electric fan of AT89S52 single-chip microcomputer ", Zhang Zhaopeng, observation and control technology.Paper in set forth single-chip microcomputer and can realize controlling the cut-out of electric current and closed.
The beneficial effects of the utility model are:
1, existing earth leakage protective device is all that the earth leakage protective device of different model has its scope of application according to inner member electric parameter action open circuit.And the earth leakage protective device that uses of general domestic circuit can not action when leakage current is less, is in the effect in this case run and can not reach saves energy for a long time.And this leakage protection circuit is applied widely, practical.
2, accuracy of detection is high, and this electric circuit inspection precision is 0.02mA.
3, this leakage protection circuit has leakage current Presentation Function, intuitively can show leakage current.
4, safety: in electrical equipment use procedure leakage current very little in; general earth leakage protective device can not action; but have obvious electric shock feeling during this electrical equipment of human contact, this leakage current detection protection circuit just can make up the deficiency of this respect, reaches the object of safeguard protection.
5, energy-conservation: this circuit just can cut off electric current when leakage current is very little, compensate for now the deficiency of other earth detectors on the market, the object of abundant saves energy can be realized.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model;
Each label in figure: 1 be Signal Collection and amplify device, 2 be rectifier filter, 3 be A/D converter, 4 be single-chip microcomputer, 5 be liquid crystal display, 6 be relay, 7 for voltage stabilizing circuit.
Embodiment
Embodiment 1: as shown in Figure 1, a kind of detection of electrical leakage and protective circuit, comprise Signal Collection and amplify device 1, rectifier filter 2, A/D converter 3, single-chip microcomputer 4, liquid crystal display 5, relay 6, voltage stabilizing circuit 7;
Described Signal Collection and amplify device 1 is connected with rectifier filter 2, and rectifier filter 2 is connected with A/D converter 3, and A/D converter 3 is connected with single-chip microcomputer 4, and single-chip microcomputer 4 is connected with relay 6 with liquid crystal display 5, and voltage stabilizing circuit 7 is connected with Signal Collection and amplify device 1.
The resistance R1 two ends of described Signal Collection and amplify device 1 are connected with the vice-side winding of current transformer, one end of electric capacity C1 other end that is connected with resistance R1 is connected with the other end of resistance R1, one end of resistance R2 is connected with electric capacity C1 one end, the other end is connected with operational amplifier T1 inverting input, one end of resistance R3 is connected with the electric capacity C1 other end, the other end is connected with the in-phase input end of operational amplifier T1, and the two ends of resistance R4 receive inverting input and the output of operational amplifier T1 respectively;
The output other end connecting resistance R5 of the electric capacity C2 mono-termination operational amplifier T1 of rectifier filter 2, the other end ground connection of resistance R5, the one termination capacitor C2 other end connecting resistance R6 of diode D1, resistance R7 receives the other end of resistance R6 and the in-phase input end of operational amplifier T2 respectively, the negative terminal other end connecting resistance R8 of electric capacity C3 mono-terminating diode D1, electric capacity C4 receives one end of resistance R6 and resistance R8 respectively, electric capacity C5 mono-terminating resistor R7 other end connecting resistance R8, the inverting input of another termination operational amplifier T2 of resistance R8, resistance R9 connects inverting input and the output of operational amplifier T2 respectively,
A/D converter 3 receives the output of operational amplifier T2; Resistance R10 mono-terminating diode D2 mono-termination power of voltage stabilizing circuit 7, a terminating resistor R3 other end ground connection of diode D2.
Embodiment 2: as shown in Figure 1, a kind of detection of electrical leakage and protective circuit, comprise Signal Collection and amplify device 1, rectifier filter 2, A/D converter 3, single-chip microcomputer 4, liquid crystal display 5, relay 6, voltage stabilizing circuit 7;
Described Signal Collection and amplify device 1 is connected with rectifier filter 2, and rectifier filter 2 is connected with A/D converter 3, and A/D converter 3 is connected with single-chip microcomputer 4, and single-chip microcomputer 4 is connected with relay 6 with liquid crystal display 5, and voltage stabilizing circuit 7 is connected with Signal Collection and amplify device 1.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (2)
1. detection of electrical leakage and a protective circuit, is characterized in that: comprise Signal Collection and amplify device (1), rectifier filter (2), A/D converter (3), single-chip microcomputer (4), liquid crystal display (5), relay (6), voltage stabilizing circuit (7);
Described Signal Collection and amplify device (1) is connected with rectifier filter (2), rectifier filter (2) is connected with A/D converter (3), A/D converter (3) is connected with single-chip microcomputer (4), single-chip microcomputer (4) is connected with relay (6) with liquid crystal display (5), and voltage stabilizing circuit (7) is connected with Signal Collection and amplify device (1).
2. detection of electrical leakage according to claim 1 and protective circuit, it is characterized in that: the resistance R1 two ends of described Signal Collection and amplify device (1) are connected with the vice-side winding of current transformer, one end of electric capacity C1 other end that is connected with resistance R1 is connected with the other end of resistance R1, one end of resistance R2 is connected with electric capacity C1 one end, the other end is connected with operational amplifier T1 inverting input, one end of resistance R3 is connected with the electric capacity C1 other end, the other end is connected with the in-phase input end of operational amplifier T1, the two ends of resistance R4 receive inverting input and the output of operational amplifier T1 respectively,
The output other end connecting resistance R5 of the electric capacity C2 mono-termination operational amplifier T1 of rectifier filter (2), the other end ground connection of resistance R5, the one termination capacitor C2 other end connecting resistance R6 of diode D1, resistance R7 receives the other end of resistance R6 and the in-phase input end of operational amplifier T2 respectively, the negative terminal other end connecting resistance R8 of electric capacity C3 mono-terminating diode D1, electric capacity C4 receives one end of resistance R6 and resistance R8 respectively, electric capacity C5 mono-terminating resistor R7 other end connecting resistance R8, the inverting input of another termination operational amplifier T2 of resistance R8, resistance R9 connects inverting input and the output of operational amplifier T2 respectively,
A/D converter (3) receives the output of operational amplifier T2; Resistance R10 mono-terminating diode D2 mono-termination power of voltage stabilizing circuit (7), a terminating resistor R3 other end ground connection of diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520278277.0U CN204651887U (en) | 2015-05-04 | 2015-05-04 | A kind of detection of electrical leakage and protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520278277.0U CN204651887U (en) | 2015-05-04 | 2015-05-04 | A kind of detection of electrical leakage and protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204651887U true CN204651887U (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520278277.0U Expired - Fee Related CN204651887U (en) | 2015-05-04 | 2015-05-04 | A kind of detection of electrical leakage and protective circuit |
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| Country | Link |
|---|---|
| CN (1) | CN204651887U (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 |
-
2015
- 2015-05-04 CN CN201520278277.0U patent/CN204651887U/en not_active Expired - Fee Related
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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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20170504 |