CN204794016U - Simple is overheated from cutting off power supply circuit - Google Patents
Simple is overheated from cutting off power supply circuit Download PDFInfo
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- CN204794016U CN204794016U CN201520406254.3U CN201520406254U CN204794016U CN 204794016 U CN204794016 U CN 204794016U CN 201520406254 U CN201520406254 U CN 201520406254U CN 204794016 U CN204794016 U CN 204794016U
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- relay
- transforming circuit
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Abstract
The utility model provides a simple is overheated from cutting off power supply circuit, including the relay, first vary voltage circuit, second vary voltage circuit and thermistor, the output common port and the one end of commercial power of relay are connected, the normal close output of relay is connected with an input of first vary voltage circuit and the one end of heating wire, the output of normally opening of relay is connected with an input of second vary voltage circuit, another input and another input of second vary voltage circuit of first vary voltage circuit are connected, the other end of heating wire and the other end of commercial power are connected, the output positive pole of first vary voltage circuit is connected with the collecting electrode of triode and the one end of first resistance. The utility model discloses can be when thermistor detect high temperature, the circuit of disconnection heating wire 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 electronic circuit field, particularly relates to a kind of simple overheated Self-disconnecting circuit.
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 to provide a kind of simple overheated Self-disconnecting circuit, solves high, the awkward problem of Self-disconnecting circuit cost.
The utility model is achieved in that a kind of simple overheated Self-disconnecting circuit, comprise relay, first transforming circuit, second transforming circuit and thermistor, the output common port of relay is connected with one end of civil power, the normally closed output of relay is connected with one end of an input of the first transforming circuit and heating wire, 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 heating wire is connected with the other end of civil power, the output cathode of the first transforming circuit is connected with one end of the collector electrode of triode and the first resistance, the output cathode of the second transforming circuit is connected with an input of the emitter 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.
The utility model tool has the following advantages: when thermistor detects high temperature, can disconnect the circuit of heating wire, 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 circuit diagram of the present utility model.
Embodiment
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 execution mode.
Refer to Fig. 1, the utility model provides a kind of simple overheated Self-disconnecting circuit, comprise relay LS1, first transforming circuit, second transforming circuit and thermistor RD1, the output common port of relay is connected with one end of civil power, the normally closed output of relay is connected with one end of an input of the first transforming circuit and heating wire, 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 heating wire L1 is connected with the other end of civil power, the output cathode of the first transforming circuit is connected with one end of the collector 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 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.
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 direct 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-heating-wire-heating.Heater strip realizes the heating to object.
In use, civil power exports above 220V alternating current to circuit the utility model.Now relay output common port with export Chang Kaiduan and be interconnected, the first transforming circuit is electrically connected with city, and transforming circuit connects output dc voltage after civil power.Heating wire is electrically connected with city, and namely heating wire 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 heating wire maintenance work.When heat source temperature is too high, the resistance of thermistor is excessive, makes the voltage on thermistor be greater than the conducting voltage of triode, triode ON, and 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 latching 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 heating wire, heating wire 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 heating wire 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 specification 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. a simple overheated Self-disconnecting circuit, it is characterized in that: comprise relay, first transforming circuit, second transforming circuit and thermistor, the output common port of relay is connected with one end of civil power, the normally closed output of relay is connected with one end of an input of the first transforming circuit and heating wire, 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 heating wire is connected with the other end of civil power, the output cathode of the first transforming circuit is connected with one end of the collector electrode of triode and the first resistance, the output cathode of the second transforming circuit is connected with an input of the emitter 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520406254.3U CN204794016U (en) | 2015-06-12 | 2015-06-12 | Simple is overheated from cutting off power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520406254.3U CN204794016U (en) | 2015-06-12 | 2015-06-12 | Simple is overheated from cutting off power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794016U true CN204794016U (en) | 2015-11-18 |
Family
ID=54533999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520406254.3U Expired - Fee Related CN204794016U (en) | 2015-06-12 | 2015-06-12 | Simple is overheated from cutting off power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204794016U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852350A (en) * | 2015-06-12 | 2015-08-19 | 林碧琴 | Simple automatic power-off circuit |
-
2015
- 2015-06-12 CN CN201520406254.3U patent/CN204794016U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852350A (en) * | 2015-06-12 | 2015-08-19 | 林碧琴 | Simple automatic power-off circuit |
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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: 20151118 Termination date: 20160612 |