CN204837845U - Simple overheat protection's electric frying pan - Google Patents
Simple overheat protection's electric frying pan Download PDFInfo
- Publication number
- CN204837845U CN204837845U CN201520411572.9U CN201520411572U CN204837845U CN 204837845 U CN204837845 U CN 204837845U CN 201520411572 U CN201520411572 U CN 201520411572U CN 204837845 U CN204837845 U CN 204837845U
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- relay
- transforming circuit
- output
- circuit
- electric hot
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Abstract
The utility model provides a simple overheat protection's electric frying pan, including electric hot tray, shell, control circuit and stabilizer blade, the electric hot tray setting is on the shell, and the stabilizer blade setting is under the shell, and control circuit sets up in the shell, control circuit includes relay, first vary voltage circuit, second vary voltage circuit and thermistor, and the output common port and the one end of commercial power of relay are connected, and the normal close output of relay is connected with an input of first vary voltage circuit and the one end of electric hot tray, and the output of normally opening of relay is connected with an input of second vary voltage circuit. The utility model discloses can be when thermistor detect high temperature, the circuit of disconnection electric hot tray to keep the state of outage, be connected once more with the commercial power disconnection up to the circuit and just continue the circular telegram, facilitate the use.
Description
Technical field
The utility model relates to electric frying pan field, particularly relates to a kind of electric frying pan of simple overtemperature protection.
Background technology
Existing firing equipment generally has power-off protection circuit, prevents the too high initiation fire hidden danger of heating-up temperature.Simply have employing to be hot fuse, temperature is too high, blown fuse, and firing equipment no longer heats, and like this once there is the situation of high temperature blown fuse, just needs to change fuse, pretty troublesome, also wastes fuse.Also some be adopt processor judge, temperature is too high, disconnect electricity, then keep the situation of power-off until power on next time, such problem be the material cost of processor and development and maintenance cost high.
Summary of the invention
The technical problems to be solved in the utility model, is the electric frying pan providing a kind of simple overtemperature protection, solves high, the awkward problem of Self-disconnecting circuit cost.
The utility model is achieved in that a kind of electric frying pan of simple overtemperature protection, comprises electric hot tray, shell, control circuit and leg, and electric hot tray is arranged on shell, and under leg is arranged on shell, control circuit is arranged in the enclosure;
Control circuit comprises relay, first transforming circuit, second transforming circuit and thermistor, the output common port of relay is connected with one end of power line, the normally closed output of relay is connected with one end of an input of the first transforming circuit and electric hot tray, the output of often opening of relay is connected with an input of the second transforming circuit, another input of first transforming circuit is connected with another input of the second transforming circuit, the other end of electric hot tray is connected with the other end of power line, the output cathode of the first transforming circuit is connected with one end of the colelctor electrode of triode and the first resistance, the output cathode of the second transforming circuit is connected with an input of the emitter stage of triode and relay, the other end of the first resistance is connected with the base stage of one end of thermistor and triode, the other end of the second resistance is connected with one end of the inverting input of comparable chip and the 3rd resistance, the output negative pole of the first transforming circuit, the output negative pole of the second transforming circuit, the other end of thermistor, the other end of the 3rd resistance and another input end grounding of relay, the resistance of thermistor rises with temperature and raises, first transforming circuit is identical with the output voltage of the second transforming circuit,
Thermistor is arranged on the surface of electric hot tray.
The utility model tool has the following advantages: when thermistor detects high temperature, can disconnect the circuit of electric hot tray, and keep the state of power-off, just can continue to be energized until circuit and civil power disconnect and be again connected, easy to use.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is circuit diagram of the present utility model.
Detailed description of the invention
By describing technology contents of the present utility model, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with embodiment.
Refer to Fig. 1 and Fig. 2, the utility model provides a kind of electric frying pan of simple overtemperature protection, and comprise electric hot tray 1, shell 2, control circuit 3 and leg 4, electric hot tray is arranged on shell, and under leg is arranged on shell, control circuit is arranged in the enclosure.
As shown in Figure 2, control circuit comprises relay LS1, first transforming circuit, second transforming circuit and thermistor RD1, the output common port of relay is connected with one end of power line 5, the normally closed output of relay is connected with one end of an input of the first transforming circuit and electric hot tray, the output of often opening of relay is connected with an input of the second transforming circuit, another input of first transforming circuit is connected with another input of the second transforming circuit, the other end of electric hot tray L1 is connected with the other end of power line, the output cathode of the first transforming circuit is connected with one end of the colelctor electrode of triode Q1 and the first resistance R1, the output cathode of the second transforming circuit is connected with an input of the emitter stage of triode and relay, the other end of the first resistance is connected with the base stage of one end of thermistor and triode, the output negative pole of the first transforming circuit, the output negative pole of the second transforming circuit, the other end of thermistor, the other end of the 3rd resistance and another input end grounding of relay, the resistance of thermistor rises with temperature and raises, first transforming circuit is identical with the output voltage of the second transforming circuit, thermistor 6 is arranged on the surface of electric hot tray.
Wherein, relay is five pin relays, and under input no power state, the output common port of relay is connected with output normal-closed end, and under the state of input energising, the output common port of relay can be connected with output Chang Kaiduan.According to the voltage of different input, common model has varied, as the JQC-3F etc. of the SRD-12VDC-SL-C of 12V, 5V.Transforming circuit for realizing the transformation of voltage, thus produces DC voltage.If namely common charger for mobile phone is the AC-DC transforming circuit that 5V exports.Thermistor can be placed into above thermal source to be detected, i.e. above the object of electric hot tray heating.Electric hot tray realizes the heating to object.
In use, power line is electrically connected with city the utility model, exports above 220V alternating current to circuit.Now the output common port of relay is interconnected with output Chang Kaiduan, and the first transforming circuit is connected with power line, and transforming circuit exports DC voltage after connecting civil power.Electric hot tray is electrically connected with city, and namely electric hot tray normally works.If the temperature that thermistor detects is lower, then the resistance of thermistor is lower, and the voltage on thermistor is lower, and lower than the conducting voltage of triode, triode not conducting, relay keeps this state, the state of electric hot tray maintenance work.When the temperature that thermistor detects is too high, the resistance of thermistor is excessive, makes the voltage on thermistor be greater than the conducting voltage of triode, triode ON, voltage leads to the input of relay through triode, makes relay input obtain electric and start adhesive.After adhesive, the output common port of relay with often open output and be connected, make the first transforming circuit disconnect the connection with civil power, and the second transforming circuit connects upper civil power, now the output voltage of transforming circuit is directly connected to the input of relay.The energising of guard relay, makes relay to remain on always and exports the state that is connected with Chang Kai output of common port, thus be disconnected the connection of civil power and electric hot tray, electric hot tray is no longer heated.First transforming circuit loses voltage simultaneously, and temperature detection below lost efficacy, even if temperature declines, also can not affect the work of relay, namely relay still can keep the state that civil power and electric hot tray disconnect.And when needs heat again, only need the 220V power supply disconnecting civil power, then once heat on the power supply connecting civil power can carry out.Reach once temperature is too high will the effect of Self-disconnecting, ensure safety.This Self-disconnecting can recover by reconnecting upper mains supply again, and without the need to processor, cost is low, easy to use.
It should be noted that, the output of transforming circuit has electric capacity to carry out filtering substantially, and the electric capacity of the first transforming circuit can maintain the off-state of relay when relay disconnects, until the circuit of the second transforming circuit obtains electric and exports.
The foregoing is only embodiment of the present utility model; not thereby scope of patent protection of the present utility model is limited; every utilize the utility model description and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (1)
1. an electric frying pan for simple overtemperature protection, is characterized in that: comprise electric hot tray, shell, control circuit and leg, and electric hot tray is arranged on shell, and under leg is arranged on shell, control circuit is arranged in the enclosure;
Control circuit comprises relay, first transforming circuit, second transforming circuit and thermistor, the output common port of relay is connected with one end of power line, the normally closed output of relay is connected with one end of an input of the first transforming circuit and electric hot tray, the output of often opening of relay is connected with an input of the second transforming circuit, another input of first transforming circuit is connected with another input of the second transforming circuit, the other end of electric hot tray is connected with the other end of power line, the output cathode of the first transforming circuit is connected with one end of the colelctor electrode of triode and the first resistance, the output cathode of the second transforming circuit is connected with an input of the emitter stage of triode and relay, the other end of the first resistance is connected with the base stage of one end of thermistor and triode, the other end of the second resistance is connected with one end of the inverting input of comparable chip and the 3rd resistance, the output negative pole of the first transforming circuit, the output negative pole of the second transforming circuit, the other end of thermistor, the other end of the 3rd resistance and another input end grounding of relay, the resistance of thermistor rises with temperature and raises, first transforming circuit is identical with the output voltage of the second transforming circuit,
Thermistor is arranged on the surface of electric hot tray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520411572.9U CN204837845U (en) | 2015-06-15 | 2015-06-15 | Simple overheat protection's electric frying pan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520411572.9U CN204837845U (en) | 2015-06-15 | 2015-06-15 | Simple overheat protection's electric frying pan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204837845U true CN204837845U (en) | 2015-12-09 |
Family
ID=54728461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520411572.9U Expired - Fee Related CN204837845U (en) | 2015-06-15 | 2015-06-15 | Simple overheat protection's electric frying pan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204837845U (en) |
-
2015
- 2015-06-15 CN CN201520411572.9U patent/CN204837845U/en not_active Expired - Fee Related
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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: 20151209 Termination date: 20160615 |