CN204667232U - A kind of constant temperature control circuit - Google Patents
A kind of constant temperature control circuit Download PDFInfo
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- CN204667232U CN204667232U CN201520460853.3U CN201520460853U CN204667232U CN 204667232 U CN204667232 U CN 204667232U CN 201520460853 U CN201520460853 U CN 201520460853U CN 204667232 U CN204667232 U CN 204667232U
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Abstract
The utility model discloses a kind of constant temperature control circuit, comprise electric battery E, one-way SCR VT, chip U1, heating wire R7, thermistor RT and potentiometer RP1, electric battery E positive pole is contact resistance R1 respectively, diode VD1 negative pole and diode VD2 positive pole, the resistance R1 other end connects heating wire R7 and resistance R2 respectively, heating wire R7 other end contact resistance R3, the resistance R3 other end connects the K pole of one-way SCR VT, the A pole of one-way SCR VT connects electric battery E negative pole respectively, the resistance R2 other end, diode VD1 positive pole, resistance R6, chip U1 pin 1, potentiometer RP2, potentiometer RP3, electric capacity C1 and diode VS positive pole.The utility model constant temperature control circuit adopts chip U1 as control center, can be good at realizing thermostatic control, and circuit structure is simple, and cost is low, and volume is little, is applicable to very much promoting the use of.
Description
Technical field
The utility model relates to a kind of control circuit, specifically a kind of constant temperature control circuit.
Background technology
Along with the development of electronic technology, high precision, easily temperature controller have become a new study hotspot, be with a wide range of applications and practical significance, a lot of temperature controls mostly to adopt single-chip microcomputer to be core controller now, this controller control accuracy is high, but steering logic is complicated, and cost is higher.
Utility model content
The purpose of this utility model is the constant temperature control circuit providing a kind of low cost, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of constant temperature control circuit, comprises electric battery E, one-way SCR VT, chip U1, heating wire R7, thermistor RT and potentiometer RP1, described electric battery E positive pole is contact resistance R1 respectively, diode VD1 negative pole and diode VD2 positive pole, the resistance R1 other end connects heating wire R7 and resistance R2 respectively, heating wire R7 other end contact resistance R3, the resistance R3 other end connects the K pole of one-way SCR VT, and the A pole of one-way SCR VT connects electric battery E negative pole respectively, the resistance R2 other end, diode VD1 positive pole, resistance R6, chip U1 pin 1, potentiometer RP2, potentiometer RP3, electric capacity C1 and diode VS positive pole, resistance R6 other end connecting luminous diode VL2 positive pole, light emitting diode VL2 negative pole respectively contact resistance R4 and chip U1 pin 3, the resistance R4 other end connects the G pole of one-way SCR VT, and described diode VD2 negative pole is contact resistance R5 respectively, chip U1 pin 4, chip U1 pin 8, thermistor RT, the potentiometer RP3 other end, the electric capacity C1 other end and diode VS negative pole, potentiometer RP3 slide plate connects chip U1 pin 5, the described potentiometer RP2 other end connects potentiometer RP1, the potentiometer RP1 other end connects thermistor RT, potentiometer RP1 slide plate connects chip U1 pin 6, chip U1 pin 7 connecting luminous diode VL1 negative pole, the light emitting diode VL1 positive pole contact resistance R5 other end.
As further program of the utility model: described chip U1 model is NE555.
As the utility model further scheme: described one-way SCR VT adopts TL431.
Compared with prior art, the beneficial effects of the utility model are: the utility model constant temperature control circuit adopts chip U1 as control center, can be good at realizing thermostatic control, and circuit structure is simple, and cost is low, and volume is little, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of constant temperature control circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of constant temperature control circuit, comprises electric battery E, one-way SCR VT, chip U1, heating wire R7, thermistor RT and potentiometer RP1, electric battery E positive pole contact resistance R1 respectively, diode VD1 negative pole and diode VD2 positive pole, the resistance R1 other end connects heating wire R7 and resistance R2 respectively, heating wire R7 other end contact resistance R3, the resistance R3 other end connects the K pole of one-way SCR VT, and the A pole of one-way SCR VT connects electric battery E negative pole respectively, the resistance R2 other end, diode VD1 positive pole, resistance R6, chip U1 pin 1, potentiometer RP2, potentiometer RP3, electric capacity C1 and diode VS positive pole, resistance R6 other end connecting luminous diode VL2 positive pole, light emitting diode VL2 negative pole respectively contact resistance R4 and chip U1 pin 3, the resistance R4 other end connects the G pole of one-way SCR VT, and diode VD2 negative pole is contact resistance R5 respectively, chip U1 pin 4, chip U1 pin 8, thermistor RT, the potentiometer RP3 other end, the electric capacity C1 other end and diode VS negative pole, potentiometer RP3 slide plate connects chip U1 pin 5, the potentiometer RP2 other end connects potentiometer RP1, the potentiometer RP1 other end connects thermistor RT, potentiometer RP1 slide plate connects chip U1 pin 6, chip U1 pin 7 connecting luminous diode VL1 negative pole, the light emitting diode VL1 positive pole contact resistance R5 other end.
Chip U1 model is NE555.
One-way SCR VT adopts TL431.
Principle of work of the present utility model is: refer to Fig. 1, when just switching on power, and the control temperature that temperature sets lower than RP3, now the resistance of RT is comparatively large, and 2 pin of U1 and 6 pin voltages are all lower than 5 pin voltages, and 3 pin export high level, VT is triggered and conducting, and R7 energising starts to heat.Along with the continuous rising of temperature, the resistance of RT diminishes gradually, when temperature reaches design temperature, when 1/2, the 6 pin voltages that the 2 pin voltages of U1 are greater than 5 pin voltages are more than or equal to 5 pin voltage, circuit upset in U1,3 pin output low levels, VT ends, R7 stops heating, and temperature starts to decline gradually, and the resistance of RT also starts to increase simultaneously, make 2 pin of U1,6 pin voltages slowly decline when the 6 pin voltages of U1 are less than or equal to 1/2 of 5 pin magnitudes of voltage lower than 5 pin voltages, 2 pin voltages, 3 pin of U1 export high level again, make VT conducting, and R7 starts again to heat.
Above process is carried out again and again, and controlled temperature can be made constant near design temperature.When R7 is energized work, VL1 extinguishes, and VL2 lights; When R7 power-off stops heating, VL1 lights, and VL2 extinguishes.RP1 and RP2 is used for regulating the temperature difference, and when the 2 pin voltages of U1 are identical with 6 pin voltages, the temperature difference is maximum; When the 2 pin voltages of U1 are 1/2 of 6 pin magnitudes of voltage, the temperature difference is zero.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (3)
1. a constant temperature control circuit, comprises electric battery E, one-way SCR VT, chip U1, heating wire R7, thermistor RT and potentiometer RP1, is characterized in that, described electric battery E positive pole is contact resistance R1 respectively, diode VD1 negative pole and diode VD2 positive pole, the resistance R1 other end connects heating wire R7 and resistance R2 respectively, heating wire R7 other end contact resistance R3, the resistance R3 other end connects the K pole of one-way SCR VT, and the A pole of one-way SCR VT connects electric battery E negative pole respectively, the resistance R2 other end, diode VD1 positive pole, resistance R6, chip U1 pin 1, potentiometer RP2, potentiometer RP3, electric capacity C1 and diode VS positive pole, resistance R6 other end connecting luminous diode VL2 positive pole, light emitting diode VL2 negative pole respectively contact resistance R4 and chip U1 pin 3, the resistance R4 other end connects the G pole of one-way SCR VT, and described diode VD2 negative pole is contact resistance R5 respectively, chip U1 pin 4, chip U1 pin 8, thermistor RT, the potentiometer RP3 other end, the electric capacity C1 other end and diode VS negative pole, potentiometer RP3 slide plate connects chip U1 pin 5, the described potentiometer RP2 other end connects potentiometer RP1, the potentiometer RP1 other end connects thermistor RT, potentiometer RP1 slide plate connects chip U1 pin 6, chip U1 pin 7 connecting luminous diode VL1 negative pole, the light emitting diode VL1 positive pole contact resistance R5 other end.
2. constant temperature control circuit according to claim 1, is characterized in that, described chip U1 model is NE555.
3. constant temperature control circuit according to claim 1, is characterized in that, described one-way SCR VT adopts TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460853.3U CN204667232U (en) | 2015-06-24 | 2015-06-24 | A kind of constant temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460853.3U CN204667232U (en) | 2015-06-24 | 2015-06-24 | A kind of constant temperature control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204667232U true CN204667232U (en) | 2015-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520460853.3U Expired - Fee Related CN204667232U (en) | 2015-06-24 | 2015-06-24 | A kind of constant temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204667232U (en) |
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2015
- 2015-06-24 CN CN201520460853.3U patent/CN204667232U/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 |
Granted publication date: 20150923 Termination date: 20160624 |
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| CF01 | Termination of patent right due to non-payment of annual fee |