CN201504086U - Water heater leakage current detection circuit - Google Patents
Water heater leakage current detection circuit Download PDFInfo
- Publication number
- CN201504086U CN201504086U CN2009201372881U CN200920137288U CN201504086U CN 201504086 U CN201504086 U CN 201504086U CN 2009201372881 U CN2009201372881 U CN 2009201372881U CN 200920137288 U CN200920137288 U CN 200920137288U CN 201504086 U CN201504086 U CN 201504086U
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- water heater
- current detection
- leakage
- main winding
- detection coil
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a water heater leakage current detection circuit. A power fire wire and a null wire of a water heater simultaneously pass through a current detection coil. An output end of a main winding of the current detection coil is connected with a control chip. When the leakage of electricity does not occur on the water heater, a resultant current of the power fire wire and the null wire in the current detection coil is 0, and an output voltage signal induced by the main winding on the left of the current detection coil is 0; and when the leakage of electricity occurs on the water heater, the resultant current of the power fire wire and the null wire is a leakage current. When the leakage current is larger than 10mA, a voltage signal induced by the main winding 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 relay.
Description
Technical field the utility model relates to the leakage protection circuit of water heater, relates in particular to a kind of water heater leakage current testing circuit that adopts the current 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 leakage current is during greater than earth leakage protective start-up parameter, the water heater leakage current testing circuit that leakage protection circuit starts.
The utility model is by the following technical solutions: the leakage current testing circuit passes electric current detecting coil simultaneously by water heater power supply live wire and zero line, and the main winding output of electric current detecting coil connects control chip.
When above-mentioned water heater did not leak electricity, power firestreak and the zero line resultant current in electric current detecting coil was 0, and the output voltage signal that the main winding induction in electric current detecting coil left side obtains is 0; When electric leakage takes place in water heater, the resultant current of power firestreak and zero line is a leakage current, when leakage current during greater than 10mA, the voltage signal that the main winding induction of electric current detecting coil obtains 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 utility model adopts above circuit; when in a single day electric leakage takes place in water heater; electric current in opposite directions in live wire and the zero line is just unequal; their resultant current is called the leakage current of back level; leakage current makes the main winding induction of electric current detecting coil obtain voltage; and change voltage signal over to control chip; when leakage current during greater than 10mA; the voltage signal that the main winding induction of electric current detecting coil obtains is greater than 10MV; 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.
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 leakage current testing circuit;
Embodiment sees also shown in Fig. 1 or 2, and the utility model passes electric current detecting coil ZCT simultaneously by water heater power supply live wire L and zero line N, and the main winding Z1 output of electric current detecting coil ZCT connects control chip IC1.When water heater did not leak electricity, power firestreak L and the resultant current of zero line N in electric current detecting coil ZCT were 0, and the output voltage signal that the main winding Z1 induction in electric current detecting coil ZCT left side obtains is 0; When electric leakage takes place in water heater, the resultant current of power firestreak L and zero line N is a leakage current, when leakage current during greater than 10mA, the voltage signal that the main winding Z1 induction of electric current detecting coil ZCT obtains 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, and driving amplifier Q2 and Q3 control relay KJ1, KJ2 power supply disconnect, and cut off the power supply of water heater.
Claims (1)
1. water heater leakage current testing circuit, it is characterized in that: it passes electric current detecting coil simultaneously by water heater power supply live wire and zero line, and the main winding output of electric current detecting coil connects control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201372881U CN201504086U (en) | 2009-03-27 | 2009-03-27 | Water heater leakage current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201372881U CN201504086U (en) | 2009-03-27 | 2009-03-27 | Water heater leakage current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201504086U true CN201504086U (en) | 2010-06-09 |
Family
ID=42455015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201372881U Expired - Fee Related CN201504086U (en) | 2009-03-27 | 2009-03-27 | Water heater leakage current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201504086U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904210A (en) * | 2012-10-08 | 2013-01-30 | 广东美的电器股份有限公司 | Leakage protection method, leakage protection device and water heater |
| CN103175303A (en) * | 2013-02-28 | 2013-06-26 | 宁波奥克斯空调有限公司 | Electrical control system used for heat-pump water heater and control method thereof |
| CN103743114A (en) * | 2013-12-27 | 2014-04-23 | 柳州职业技术学院 | Water temperature automatic control circuit for temperature constant water heater |
| CN106849006A (en) * | 2017-04-13 | 2017-06-13 | 广州心敢享节能科技有限公司 | A kind of intelligence is with earth leakage protective electric water heater controller |
-
2009
- 2009-03-27 CN CN2009201372881U patent/CN201504086U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904210A (en) * | 2012-10-08 | 2013-01-30 | 广东美的电器股份有限公司 | Leakage protection method, leakage protection device and water heater |
| CN103175303A (en) * | 2013-02-28 | 2013-06-26 | 宁波奥克斯空调有限公司 | Electrical control system used for heat-pump water heater and control method thereof |
| CN103743114A (en) * | 2013-12-27 | 2014-04-23 | 柳州职业技术学院 | Water temperature automatic control circuit for temperature constant water heater |
| CN106849006A (en) * | 2017-04-13 | 2017-06-13 | 广州心敢享节能科技有限公司 | A kind of intelligence is with earth leakage protective electric water heater controller |
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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 |
Granted publication date: 20100609 Termination date: 20150327 |
|
| EXPY | Termination of patent right or utility model |