CN103799857A - Water boiling automatic power-off device for electric kettle - Google Patents
Water boiling automatic power-off device for electric kettle Download PDFInfo
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- CN103799857A CN103799857A CN201410084240.4A CN201410084240A CN103799857A CN 103799857 A CN103799857 A CN 103799857A CN 201410084240 A CN201410084240 A CN 201410084240A CN 103799857 A CN103799857 A CN 103799857A
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Abstract
The invention relates to a water boiling automatic power-off device for an electric kettle, which is characterized by comprising a 5V DC (Direct Current) power supply, a temperature detection and transistor biasing circuit, a DC relay driving circuit, a 220V AC (Alternating Current) power supply and an electric heating circuit, wherein the temperature detection and transistor biasing circuit consists of a temperature switch WK and a linear potentiometer RP; the DC relay driving circuit consists of a NPN-type transistor VT1, a DC relay J and a switching diode D1; in the electric heating circuit, one end of a power supply socket CZ is connected with a zero line end N of the 220V DC power supply, the other end of the power supply socket CZ is connected with a normally-closed-contact J-1 stationary contact of the DC relay J, and a normally-closed-contact J-1 movable contact of the DC relay J is connected with a fire wire end L of the 220V DC power supply. According to the principle that an object expands by heat and contracts by cold, a temperature controller is arranged on the lower surface of the electric kettle; due to a low control current of the temperature controller, one stage of signal amplification is increased for driving the DC relay.
Description
Technical field
The invention belongs to temperature control technology field, is to open auto-power-off device about a kind of electric kettle for water.
Background technology
The present invention is according to object rising-heat contracting-cold principle, below insulating pot, place a temperature controller, it makes contact with metal copper sheet, because metal copper sheet is more responsive to rising-heat contracting-cold, so when temperature does not arrive setting value, metallic copper plate shape is bending, at this moment switch contact is closed connects, 220V AC power is connected kettle and is kept heated condition, in the time that water is heated to the temperature of temperature controller setting, heat in insulating pot is transmitted to the copper sheet in temperature controller, and copper sheet stretches contact is flicked into off-position because being heated.Because temperature controller control electric current is less, increase one stage signal amplifying circuit and be used for driving DC relay.
Below describe electric kettle for water of the present invention in detail and open the relevant technologies that auto-power-off device relates in implementation process.
Summary of the invention
Goal of the invention and beneficial effect: the present invention is according to object rising-heat contracting-cold principle, below insulating pot, place a temperature controller, it makes contact with metal copper sheet, because metal copper sheet is more responsive to rising-heat contracting-cold, so when temperature does not arrive setting value, metallic copper plate shape is bending, at this moment switch contact is closed connects, 220V AC power is connected kettle and is kept heated condition, in the time that water is heated to the temperature of temperature controller setting, heat in insulating pot is transmitted to the copper sheet in temperature controller, copper sheet stretches contact is flicked into off-position because being heated.Because temperature controller control electric current is less, increase one stage signal amplifying circuit and be used for driving DC relay.
Circuit working principle: utilize temperature detect switch (TDS) WK as temperature sensor, along with the rising of water-in-kettle temperature, temperature detect switch (TDS) WK environment temperature also rises thereupon.In the time that water temperature in insulating pot reaches 100 ℃, the two ends of temperature detect switch (TDS) WK are connected, more than O.7V the base voltage of NPN transistor VT1 rises to, make NPN transistor VT1 conducting, DC relay J starts action, the normally-closed contact J-1 of DC relay J disconnects, and insulating pot heater 220V AC power is cut off, and insulating pot heater stops heating.
Technical scheme: electric kettle for water is opened auto-power-off device, it comprises 5V dc source, temperature detection and transistor bias circult, DC relay drive circuit, 220V AC power and electric heating circuit, it is characterized in that:
Temperature detection and transistor bias circult: it is made up of temperature switch WK and linear potentiometer RP, the anodal VCC of a termination circuit of temperature switch WK, the other end of temperature switch WK connects one end of linear potentiometer RP, the other end connection circuit ground GND of linear potentiometer RP, the activity termination DC relay drive circuit of linear potentiometer RP;
DC relay drive circuit: it is made up of NPN transistor VT1, DC relay J and switching diode D1, the base stage of NPN transistor VT1 connects the movable end of linear potentiometer RP, the colelctor electrode of NPN transistor VT1 connects one end of DC relay J coil and the positive pole of switching diode D1, the anodal VCC of the other end of DC relay J coil and the negative pole connection circuit of switching diode D1, the emitter stage connection circuit ground GND of NPN transistor VT1;
5V DC power anode is connected with circuit anode VCC, and 5V DC power cathode is connected with circuit ground GND;
Electric heating circuit: the zero line side N of a termination 220V AC power of supply socket CZ, the normally-closed contact J-1 stationary contact of another termination DC relay J of supply socket CZ, the normally-closed contact J-1 movable contact of DC relay J meets the live wire end L of 220V AC power.
Accompanying drawing explanation
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the invention provides an electric kettle for water and open auto-power-off device.
The specific embodiment
Open circuit working schematic diagram and the accompanying drawing explanation of auto-power-off device according to electric kettle for water shown in accompanying drawing 1, and according to the annexation between components and parts in the each several part circuit described in summary of the invention, and the components and parts technical parameter described in embodiment requires to implement to realize the present invention.
The technical parameter of components and parts and selection requirement
VT1 is NPN transistor, and the model of selecting is 2SC9013, requires multiplication factor β >=160;
WK is temperature switch, and selecting model is WRC Series Microprocessor Temperature Controller, and operating temperature is 100 ℃, temperature accuracy: ± 0.4 ℃, operating temperature also can be selected corresponding model according to actual needs;
RP is linear potentiometer, and the resistance of selecting is that 33K Ω, power are 1W;
D1 is switching diode, and the model of selecting is 1N4148;
J is DC relay, and the model of selecting is JRK-13F, and coil working voltage is 5V, requires contact current >=10A of normally-closed contact J-1;
CZ is supply socket, and selected parameter is 250V/15A AC Power supply socket.
Circuit production main points and circuit debugging explanation
The placement of temperature detect switch (TDS) WK: because hot water all floats over the top of insulating pot, in order to guarantee that the temperature of water in insulating pot all reaches 100 ℃, so require temperature detect switch (TDS) WK to be placed in the lower curtate of insulating pot, refer to shown in Figure of description 1;
Circuit debugging: require that center at the bottom of insulating pot is just pressed in to temperature detect switch (TDS) WK upper, insulating pot filled with water, insulating pot is connected 220V AC power, in the time that water is boiled, slowly adjusts the position of linear potentiometer RP, until DC relay J normally-closed contact J-1 disconnects;
According to foregoing circuit adjustment method, repeatedly debug 2～3 times, confirm that the position that linear potentiometer RP adjusts remains unchanged substantially, circuit debugging work accused.
Claims (1)
1. electric kettle for water is opened an auto-power-off device, and it comprises 5V dc source, temperature detection and transistor bias circult, DC relay drive circuit, 220V AC power and electric heating circuit, it is characterized in that:
Described temperature detection and transistor bias circult are made up of temperature switch WK and linear potentiometer RP, the anodal VCC of a termination circuit of temperature switch WK, the other end of temperature switch WK connects one end of linear potentiometer RP, the other end connection circuit ground GND of linear potentiometer RP, the activity termination DC relay drive circuit of linear potentiometer RP;
Described DC relay drive circuit is made up of NPN transistor VT1, DC relay J and switching diode D1, the base stage of NPN transistor VT1 connects the movable end of linear potentiometer RP, the colelctor electrode of NPN transistor VT1 connects one end of DC relay J coil and the positive pole of switching diode D1, the anodal VCC of the other end of DC relay J coil and the negative pole connection circuit of switching diode D1, the emitter stage connection circuit ground GND of NPN transistor VT1;
Described 5V DC power anode is connected with circuit anode VCC, and 5V DC power cathode is connected with circuit ground GND;
In described electric heating circuit, the zero line side N of a termination 220V AC power of supply socket CZ, the normally-closed contact J-1 stationary contact of another termination DC relay J of supply socket CZ, the normally-closed contact J-1 movable contact of DC relay J meets the live wire end L of 220V AC power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410084240.4A CN103799857A (en) | 2014-03-09 | 2014-03-09 | Water boiling automatic power-off device for electric kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410084240.4A CN103799857A (en) | 2014-03-09 | 2014-03-09 | Water boiling automatic power-off device for electric kettle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103799857A true CN103799857A (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410084240.4A Pending CN103799857A (en) | 2014-03-09 | 2014-03-09 | Water boiling automatic power-off device for electric kettle |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633740A (en) * | 2016-03-22 | 2016-06-01 | 周玉林 | Human body induction temperature-adjusting electric iron safety socket |
| CN105703170A (en) * | 2016-04-05 | 2016-06-22 | 王志 | Electric soldering iron power controller capable of sensing whether human body is in place |
| CN108834234A (en) * | 2018-07-12 | 2018-11-16 | 江门市银河科技发展有限公司 | A kind of overtemperature protection system for electromagnetic heater |
| CN112506251A (en) * | 2020-12-24 | 2021-03-16 | 石家庄谦航贸易有限公司 | Intelligent temperature control box device capable of standing and cooling in advance |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2746851Y (en) * | 2004-11-11 | 2005-12-21 | 郑核潜 | Safety and electrically heating kettle |
| CN200948064Y (en) * | 2006-09-18 | 2007-09-19 | 深圳市和而泰电子科技有限公司 | Electric water boiler |
| CN201840290U (en) * | 2010-06-18 | 2011-05-25 | 浙江盈科电子有限公司 | Safe electric cooker and electric pressure cooker |
| CN202678218U (en) * | 2012-07-02 | 2013-01-16 | 杭州朗能电子科技有限公司 | Relay driving circuit used for electric pressure pot heating |
| CN203838575U (en) * | 2014-03-09 | 2014-09-17 | 黄月华 | An electric kettle water boiling automatic power-off apparatus |
-
2014
- 2014-03-09 CN CN201410084240.4A patent/CN103799857A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2746851Y (en) * | 2004-11-11 | 2005-12-21 | 郑核潜 | Safety and electrically heating kettle |
| CN200948064Y (en) * | 2006-09-18 | 2007-09-19 | 深圳市和而泰电子科技有限公司 | Electric water boiler |
| CN201840290U (en) * | 2010-06-18 | 2011-05-25 | 浙江盈科电子有限公司 | Safe electric cooker and electric pressure cooker |
| CN202678218U (en) * | 2012-07-02 | 2013-01-16 | 杭州朗能电子科技有限公司 | Relay driving circuit used for electric pressure pot heating |
| CN203838575U (en) * | 2014-03-09 | 2014-09-17 | 黄月华 | An electric kettle water boiling automatic power-off apparatus |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633740A (en) * | 2016-03-22 | 2016-06-01 | 周玉林 | Human body induction temperature-adjusting electric iron safety socket |
| CN105703170A (en) * | 2016-04-05 | 2016-06-22 | 王志 | Electric soldering iron power controller capable of sensing whether human body is in place |
| CN108834234A (en) * | 2018-07-12 | 2018-11-16 | 江门市银河科技发展有限公司 | A kind of overtemperature protection system for electromagnetic heater |
| CN112506251A (en) * | 2020-12-24 | 2021-03-16 | 石家庄谦航贸易有限公司 | Intelligent temperature control box device capable of standing and cooling in advance |
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Application publication date: 20140521 |