CN203838575U - An electric kettle water boiling automatic power-off apparatus - Google Patents
An electric kettle water boiling automatic power-off apparatus Download PDFInfo
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- CN203838575U CN203838575U CN201420104720.8U CN201420104720U CN203838575U CN 203838575 U CN203838575 U CN 203838575U CN 201420104720 U CN201420104720 U CN 201420104720U CN 203838575 U CN203838575 U CN 203838575U
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Abstract
The utility model relates to an electric kettle water boiling automatic power-off apparatus characterized in that the electric kettle water boiling automatic power-off apparatus comprises a 5V direct current power supply, a temperature detection and transistor bias circuit, a direct current relay drive circuit, a 220V alternating current power supply and an electric heating circuit. The temperature detection and transistor bias circuit is composed of a temperature switch WK and a linear potentiometer RP. The direct current relay drive circuit is composed of an NPN type transistor VT1, a direct current relay J and a switch diode D1. In the electric heating circuit, one end of a power socket CZ is connected with a null line end N of the 220V alternating current power supply, and the other end of the power socket CZ is connected with a normally closed contact J-1 fixed contact of the direct current relay J; and a normally closed contact J-1 moving contact of the direct current relay J is connected with a live wire end L of the 220V alternating current power supply. According to a principle of expanding with heat and shrinking with cold, a temperature controller is put under an electric kettle; and because control currents of the temperature controller are relatively small, a signal amplification circuit is added to drive the direct current relay.
Description
Technical field
The utility model belongs to temperature control technology field, is to open auto-power-off device about a kind of electric kettle for water.
Background technology
The utility model 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 crooked, at this moment switch contact is closed connects, 220V AC power is connected kettle and is kept heated condition, when 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 described in the utility model in detail and open the relevant technologies that auto-power-off device relates in implementation process.
Utility model content
Goal of the invention and beneficial effect: the utility model 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 crooked, at this moment switch contact is closed connects, 220V AC power is connected kettle and is kept heated condition, when 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.When in insulating pot, water temperature 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 well heater 220V AC power is cut off, and insulating pot well heater stops heating.
Technical scheme: electric kettle for water is opened auto-power-off device, it comprises 5V direct supply, temperature detection and transistor bias circult, DC relay driving circuit, 220V AC power and electric heating circuit, it is characterized in that:
Temperature detection and transistor bias circult: it is comprised 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 driving circuit of linear potentiometer RP;
DC relay driving circuit: it is comprised 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 collector of NPN transistor VT1 connects one end of DC relay J coil and the positive pole of switching diode D1, the anodal VCC of negative pole connection circuit of the other end of DC relay J coil and switching diode D1, the emitter 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 moving 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 utility model provides an electric kettle for water to open auto-power-off device.
Embodiment
According to electric kettle for water shown in accompanying drawing 1, open circuit working schematic diagram and the accompanying drawing explanation of auto-power-off device, and according to the annexation between components and parts in the each several part circuit described in utility model content, and the components and parts technical parameter described in embodiment requires to implement to realize the utility model.
The technical parameter of components and parts and selection requirement
VT1 is NPN transistor, and the model of selecting is 2SC9013, requires enlargement 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, when 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 direct supply, temperature detection and transistor bias circult, DC relay driving circuit, 220V AC power and electric heating circuit, it is characterized in that:
Described temperature detection and transistor bias circult are comprised 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 driving circuit of linear potentiometer RP;
Described DC relay driving circuit is comprised 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 collector of NPN transistor VT1 connects one end of DC relay J coil and the positive pole of switching diode D1, the anodal VCC of negative pole connection circuit of the other end of DC relay J coil and switching diode D1, the emitter 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 moving 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 |
|---|---|---|---|
| CN201420104720.8U CN203838575U (en) | 2014-03-09 | 2014-03-09 | An electric kettle water boiling automatic power-off apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420104720.8U CN203838575U (en) | 2014-03-09 | 2014-03-09 | An electric kettle water boiling automatic power-off apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203838575U true CN203838575U (en) | 2014-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420104720.8U Expired - Fee Related CN203838575U (en) | 2014-03-09 | 2014-03-09 | An electric kettle water boiling automatic power-off apparatus |
Country Status (1)
| Country | Link |
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| CN (1) | CN203838575U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103799857A (en) * | 2014-03-09 | 2014-05-21 | 黄月华 | Water boiling automatic power-off device for electric kettle |
-
2014
- 2014-03-09 CN CN201420104720.8U patent/CN203838575U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103799857A (en) * | 2014-03-09 | 2014-05-21 | 黄月华 | Water boiling automatic power-off device for electric kettle |
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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: 20140917 Termination date: 20150309 |
|
| EXPY | Termination of patent right or utility model |