CN201504087U - Water heater leakage voltage detection circuit - Google Patents
Water heater leakage voltage detection circuit Download PDFInfo
- Publication number
- CN201504087U CN201504087U CN2009201372932U CN200920137293U CN201504087U CN 201504087 U CN201504087 U CN 201504087U CN 2009201372932 U CN2009201372932 U CN 2009201372932U CN 200920137293 U CN200920137293 U CN 200920137293U CN 201504087 U CN201504087 U CN 201504087U
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- water heater
- ground wire
- control chip
- winding
- current detection
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- Expired - Fee Related
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- Control Of Resistance Heating (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a water heater leakage voltage detection circuit. An input end of an optical coupler is connected between a ground wire and a null wire of a water heater by a current-limiting resistance. An output end of the optical coupler is connected with a testing winding on the right of a current detection coil. An output end of a main winding of the current detection coil is connected with a control chip. When a potential difference between the ground wire and the null wire of the water heater is larger than 42V, legs (1 and 2) of the optical coupler are conducted so that the testing winding is conducted, an output voltage signal induced by the main winding on the left of the current detection coil is larger than 10MV, a signal generated by the main winding of the current detection coil is transferred to the control chip, and the control chip generates a high level output signal to drive and control to switch off the power of a rely, and then the power of the water heater is switched off so as to achieve the effect of water heater leakage protection.
Description
Technical field the utility model relates to the leakage protection circuit of water heater, relates in particular to a kind of water heater electrical leakage voltage testing circuit that adopts the voltage detecting electrical leakage.
Background technology water heater earth leakage protective is general to adopt two kinds of methods: a kind of is that turnover water end (W.E.) at water heater adopts one section insulated tube or other insulator; to prevent the metallic water pipe conduction; perhaps when the electric leakage situation takes place, utilize the current value in the insulator reduction water.When this structure can't prevent earth wire failure, the danger that the water heater metal shell is charged can't reach safe earth leakage protective function.Another kind is to adopt the detection of electrical leakage circuit, normally utilizes electric mutual inductor to detect the electrical leakage value, and wherein an end connects ground wire, and when electrical leakage surpassed safety value, earth leakage protective device is work just.When this structure still can't be protected ground wire grounded inefficacy, water heater housing accident was charged, and the earth leakage protective device function just lost efficacy.The patent No. is 02138389.8 " a kind of leakage protection circuit of electric heater "; there is not earth leakage protective problem under the effective grounding situation in order to solve ground wire; it is detected and change-over circuit by electric power polarity; the polar switching latching circuit; the earth leakage protective relay; detection of electrical leakage comparison circuit and protection executive circuit are formed; civil power is imported by the electric power polarity testing circuit; at last to electric heater; the earth leakage protective relay is set between electric power polarity change-over circuit and electric heater; the polar switching latching circuit is connected in the electric power polarity testing circuit; between the electric power polarity change-over circuit; detection of electrical leakage comparison circuit input connects zero line and ground wire and compares both potential differences; the holding wire of output is connected to the input of earth leakage protective executive circuit, and the output of earth leakage protective executive circuit is connected to the earth leakage protective relay; the break-make of control earth leakage protective relay.But this leakage protection circuit complex structure.
Summary of the invention the utility model purpose provides a kind of when water heater leaks electricity, and electrical leakage voltage is during greater than earth leakage protective start-up parameter, the water heater electrical leakage voltage testing circuit that leakage protection circuit starts.
The utility model is by the following technical solutions: the electrical leakage voltage testing circuit is by the input that is connected to the light lotus root between the ground wire of water heater and the zero line by current-limiting resistance, the output of light lotus root connects the test winding on electric current detecting coil right side, and the main winding output of electric current detecting coil connects control chip.
When above-mentioned ground wire and the potential difference between the zero line during greater than 42V, 1, the 2 pin conductings of light lotus root, make and test the winding conducting, the output voltage signal of the main winding induction in electric current detecting coil left side is greater than 10MV, the signal that the main winding of electric current detecting coil produces changes control chip over to, control chip produces the high level output signal, and the power supply of drive controlling relay disconnects, and cuts off the power supply of water heater.
The other end of above-mentioned ground wire is connected with water heater outlet with metal shell.
The utility model adopts above circuit, and ground wire electrification has following reason usually: 1, the external environment condition earth connection is charged; 2, metal shell is charged; 3, water outlet is charged; 4, zero line N is charged; 5, live wire is inserted zero line N.When water heater did not have electric leakage, ground wire was not charged, and it is zero that potential difference is arranged between ground wire and the zero line; Charged when zero line, or when live wire inserted zero line, the potential difference between ground wire and the zero line was greater than 42V, electric current detecting coil changes signal over to control chip, control chip produces the high level output signal, and the power supply of drive controlling relay disconnects, and cuts off the power supply of water heater; Local tape electricity, the potential difference between ground wire and the zero line are during greater than 42V, and electric current detecting coil changes signal over to control chip; control chip produces the high level output signal; the power supply of drive controlling relay disconnects, and cuts off the power supply of water heater, so can reach the earth leakage protective effect of water heater.Adopt ground wire to be connected with outlet pipe, can avoid metal shell and outlet pipe accident charged, produce leakage current, the more effective safety of guaranteeing that water heater uses with metal shell.
Description of drawings now is further elaborated the utility model in conjunction with the accompanying drawings:
Fig. 1 is the schematic diagram of the utility model electrical leakage voltage testing circuit;
Fig. 2 is the schematic diagram of the way circuit of the utility model water heater.
Embodiment sees also shown in Fig. 1 or 2, the utility model is by the input that is connected to light lotus root IC2 between the ground wire PE of water heater and the zero line N by current-limiting resistance R, the output of light lotus root IC2 connects the test winding Z2 on electric current detecting coil ZCT right side, and the main winding Z1 output of electric current detecting coil ZCT connects control chip IC1.When the potential difference between ground wire PE and the zero line N during greater than 42V; 1 of light lotus root IC2; 2 pin conductings; make and test winding Z2 conducting; the output voltage signal of the main winding Z1 induction in electric current detecting coil ZCT left side is greater than 10MV; the signal that the main winding Z1 of electric current detecting coil ZCT produces changes control chip IC1 over to; control chip IC1 produces the high level output signal; driving amplifier Q01 conducting; luminous tube LED01 is lighted; the collector electrode of amplifier Q01 produces the earth leakage protective signal; send control chip IC1 to, control chip IC1 driving amplifier Q2 and Q3 control relay KJ1; the KJ2 power supply disconnects, and cuts off the power supply of water heater.
The other end of above-mentioned ground wire PE is connected with the outlet pipe 2 of metal shell 1 and water heater.
Claims (2)
1. water heater electrical leakage voltage testing circuit, it is characterized in that: it is by the input that is connected to the light lotus root between the ground wire of water heater and the zero line by current-limiting resistance, the output of light lotus root connects the test winding on electric current detecting coil right side, and the main winding output of electric current detecting coil connects control chip.
2. a kind of water heater electrical leakage voltage testing circuit according to claim 1, it is characterized in that: the other end of its ground wire is connected with water heater outlet with metal shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201372932U CN201504087U (en) | 2009-03-27 | 2009-03-27 | Water heater leakage voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201372932U CN201504087U (en) | 2009-03-27 | 2009-03-27 | Water heater leakage voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201504087U true CN201504087U (en) | 2010-06-09 |
Family
ID=42455016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201372932U Expired - Fee Related CN201504087U (en) | 2009-03-27 | 2009-03-27 | Water heater leakage voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201504087U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074927A (en) * | 2010-12-13 | 2011-05-25 | 南京民盛电子仪器有限公司 | Earth leakage protection circuit of withstand voltage tester |
| CN103187706A (en) * | 2011-12-28 | 2013-07-03 | 樱花卫厨（中国）股份有限公司 | Voltage detection leakage protection device for electric water heater |
| CN106322767A (en) * | 2015-06-23 | 2017-01-11 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
-
2009
- 2009-03-27 CN CN2009201372932U patent/CN201504087U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074927A (en) * | 2010-12-13 | 2011-05-25 | 南京民盛电子仪器有限公司 | Earth leakage protection circuit of withstand voltage tester |
| CN103187706A (en) * | 2011-12-28 | 2013-07-03 | 樱花卫厨（中国）股份有限公司 | Voltage detection leakage protection device for electric water heater |
| CN103187706B (en) * | 2011-12-28 | 2016-05-11 | 樱花卫厨（中国）股份有限公司 | Electrical water heater electric is pressed detection type earth leakage protective device |
| CN106322767A (en) * | 2015-06-23 | 2017-01-11 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
| CN106322767B (en) * | 2015-06-23 | 2019-11-05 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
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Legal Events
| 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: 20100609 Termination date: 20170327 |