CN104901274A - Self-power-off circuit - Google Patents
Self-power-off circuit Download PDFInfo
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- CN104901274A CN104901274A CN201510323194.3A CN201510323194A CN104901274A CN 104901274 A CN104901274 A CN 104901274A CN 201510323194 A CN201510323194 A CN 201510323194A CN 104901274 A CN104901274 A CN 104901274A
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- transforming circuit
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Abstract
The invention discloses a self-power-off circuit, and the circuit comprises a relay, a first transformation circuit, a second transformation circuit, and a thermistor. The output common end of the relay is connected with one end of the commercial power, and a normally-closed output end of the relay is connected with one input end of the first transformation circuit and one end of a heating wire. A normally-opened output end of the relay is connected with one input end of the second transformation circuit. The other input end of the first transformation circuit is connected with the other input end of the second transformation circuit, the other end of the heating wire and the other end of the commercial power. The output positive electrode of the first transformation circuit is connected with a power positive end of a comparison chip, one end of a first resistor, and one end of a second resistor. The output positive electrode of the second transformation circuit is connected with the negative electrode of a diode and one input end of the relay. The circuit can cut off the circuit of the heating wire when the thermistor detect high temperature, and remain a power-off state till the circuit is disconnected with the commercial power and then connected with the commercial power supply. Therefore, the circuit is convenient to use.
Description
Technical field
The present invention relates to electronic circuit field, particularly relate to a kind of 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 problem to be solved in the present invention, is to provide a kind of Self-disconnecting circuit, solves high, the awkward problem of Self-disconnecting circuit cost.
The present invention is achieved in that a kind of 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 and the power positive end of comparable chip, one end of first resistance is connected with one end of the second resistance, the output cathode of the second transforming circuit is connected with an input of the negative pole of diode and relay, the positive pole of diode is connected with the output of comparable chip, the other end of the first resistance is connected with the in-phase input end of one end of thermistor and comparable chip, 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 power supply negative terminal of comparable chip, 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.
Tool of the present invention 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 invention.
Embodiment
By describing technology contents of the present invention, 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 invention provides a kind of Self-disconnecting circuit, comprise relay LS1, first transforming circuit (transforming circuit 1 in Fig. 1), second transforming circuit (transforming circuit 2 in Fig. 1) 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 and the power positive end of comparable chip U1, one end of first resistance R1 is connected with one end of the second resistance R2, the output cathode of the second transforming circuit is connected with an input of the negative pole of diode D1 and relay, the positive pole of diode is connected with the output of comparable chip, the other end of the first resistance is connected with the in-phase input end of one end of thermistor and comparable chip, the other end of the second resistance is connected with one end of the inverting input of comparable chip and the 3rd resistance R3, the output negative pole of the first transforming circuit, the output negative pole of the second transforming circuit, the power supply negative terminal of comparable chip, 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 in the present invention.Now relay output common port with export Chang Kaiduan and be interconnected, transforming circuit 1 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 voltage above the 3rd resistance, comparable chip does not export, and 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 voltage of the 3rd resistance, comparable chip output output voltage, voltage leads to the input of relay through diode, makes relay input obtain electric and start adhesive.After adhesive, the output common port of relay with often open output and be connected, make transforming circuit 1 disconnect the connection with civil power, and transforming circuit 2 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.Transforming circuit 1 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 transforming circuit 1 can maintain the off-state of relay when relay disconnects, until the circuit of transforming circuit 2 obtains electric and exports.
The foregoing is only embodiments of the invention; not thereby scope of patent protection of the present invention is limited; every utilize specification of the present invention 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 invention.
Claims (1)
1. a 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 and the power positive end of comparable chip, one end of first resistance is connected with one end of the second resistance, the output cathode of the second transforming circuit is connected with an input of the negative pole of diode and relay, the positive pole of diode is connected with the output of comparable chip, the other end of the first resistance is connected with the in-phase input end of one end of thermistor and comparable chip, 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 power supply negative terminal of comparable chip, 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 |
|---|---|---|---|
| CN201510323194.3A CN104901274A (en) | 2015-06-12 | 2015-06-12 | Self-power-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510323194.3A CN104901274A (en) | 2015-06-12 | 2015-06-12 | Self-power-off circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104901274A true CN104901274A (en) | 2015-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510323194.3A Pending CN104901274A (en) | 2015-06-12 | 2015-06-12 | Self-power-off circuit |
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| CN (1) | CN104901274A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074782A (en) * | 1992-01-21 | 1993-07-28 | 龙三 | Overload cut off self-lock type relay |
| CN2753032Y (en) * | 2004-11-26 | 2006-01-18 | 宝钢集团上海第一钢铁有限公司 | Overheat protection controller |
| US20130134800A1 (en) * | 2011-11-25 | 2013-05-30 | Samsung Electronics Co., Ltd. | Power supply apparatus and control method thereof |
| CN203957234U (en) * | 2014-08-10 | 2014-11-26 | 徐美琴 | A kind of plastic products corner machine of eliminating |
| CN204167961U (en) * | 2014-11-08 | 2015-02-18 | 吴江德雷克斯电子有限公司 | USB automobile charger automatic shutdown circuitry |
| CN204794017U (en) * | 2015-06-12 | 2015-11-18 | 林碧琴 | Circuit with from power -off protection |
-
2015
- 2015-06-12 CN CN201510323194.3A patent/CN104901274A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074782A (en) * | 1992-01-21 | 1993-07-28 | 龙三 | Overload cut off self-lock type relay |
| CN2753032Y (en) * | 2004-11-26 | 2006-01-18 | 宝钢集团上海第一钢铁有限公司 | Overheat protection controller |
| US20130134800A1 (en) * | 2011-11-25 | 2013-05-30 | Samsung Electronics Co., Ltd. | Power supply apparatus and control method thereof |
| CN203957234U (en) * | 2014-08-10 | 2014-11-26 | 徐美琴 | A kind of plastic products corner machine of eliminating |
| CN204167961U (en) * | 2014-11-08 | 2015-02-18 | 吴江德雷克斯电子有限公司 | USB automobile charger automatic shutdown circuitry |
| CN204794017U (en) * | 2015-06-12 | 2015-11-18 | 林碧琴 | Circuit with from power -off protection |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |