CN201742381U - TL431 upper temperature limit alternating current switching circuit - Google Patents
TL431 upper temperature limit alternating current switching circuit Download PDFInfo
- Publication number
- CN201742381U CN201742381U CN2010205039452U CN201020503945U CN201742381U CN 201742381 U CN201742381 U CN 201742381U CN 2010205039452 U CN2010205039452 U CN 2010205039452U CN 201020503945 U CN201020503945 U CN 201020503945U CN 201742381 U CN201742381 U CN 201742381U
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- Prior art keywords
- alternating current
- switching circuit
- current switching
- temperature
- power supply
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- Expired - Fee Related
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- 238000009529 body temperature measurement Methods 0.000 abstract 3
- 230000000694 effects Effects 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
At present, a temperature sensor and a measurement comparing circuit are commonly used for temperature measurement and control, the modes are various, the performance costs are different, and efficient and simple schemes are limited by components monopolizing of large companies, so that the tendency to high cost performance ratio of product design is blocked. The utility model provides a TL431 upper temperature limit alternating current switching circuit; a TL431 single threshold with a temperature compensation function is adopted and compared for constituting a temperature measurement and control circuit, and a power supply of 3.8V is connected with the K pole of the TL431 through a light-emitting diode (LED) in a optical coupling; and the power supply of 3.8V is connected with the R pole of the TL431 through a thermistor Rt with negative stability coefficient, and connected with the A pole (a ground wire) of the TL431 through a temperature setting element Rw and a capacitor C. As a bidirectional silicon controlled alternating current switching circuit formed by the coupled connection of the LED with red light Phi3 and a photoresistor is adopted, the TL431upper temperature limit alternating current switching circuit has the power consumption less than or equal to 1milliwatt, and as general components are adopted, the effects of low power consumption and low cost can be achieved. The TL431 upper temperature limit alternating current switching circuit can be widely used for temperature measurement and control and the automatic control of an alternating current switch.
Description
Affiliated technical field
The utility model relates to a kind of TL431 temperature upper limit alternating current switching circuit, can be in the automatic AC switch with measurement and control of temperature.
Background technology
At present, be used for measurement and control of temperature, generally be made up of temperature sensor, measurement comparison circuit, mode is multiple, and the performance cost is different, and efficient simple and direct scheme is subject to the device monopolization of major company again, has hindered the high performance-price ratio trend of product design.
Summary of the invention
The utility model TL431 temperature upper limit alternating current switching circuit adopts universal component, and lower cost solution can be widely used in thermometric automatic AC switch.
The technical scheme that its technical problem that solves the utility model adopts is: the simple gate limit that adopts TL431 to have temperature-compensating relatively constitutes emperature emasuring and controlling circuit, the K utmost point of 3.8V power supply emitting led connection TL431 in optical coupling; 3.8V power supply connects the R utmost point of TL431 and passes through temperature setting element Rw through negative stability coefficient resistance Rt and is connected with the A utmost point (ground wire) of TL431 with capacitor C.The bidirectional triode thyristor alternating current switching circuit that employing is of coupled connections by φ 3 red-light LEDs and photo resistance.Power consumption in 1 milliwatt, adopts universal component, low-power consumption, low cost less than oneself.
The beneficial effects of the utility model are, measurement and control of temperature and be controlled at modern industry automatically and product is widely used, and TL431 temperature upper limit alternating current switching circuit, in low-power consumption, low cost, the product of high performance-price ratio is used original advantage.
Description of drawings
Below in conjunction with accompanying drawing and example the utility model is further specified.
Among the figure the utility model TL431 temperature upper limit alternating current switching circuit figure.
Specific embodiments
The simple gate limit that adopts TL431 to have temperature-compensating among the figure relatively constitutes emperature emasuring and controlling circuit, the K utmost point of 3.8V power supply emitting led connection TL431 in optical coupling; 3.8V power supply connects the R utmost point of TL431 and passes through temperature setting element Rw through negative stability coefficient resistance Rt and is connected with the A utmost point (ground wire) of TL431 with capacitor C, capacitor C, can select ten to hundreds of microfarads, reach reference voltage change slightly let out after, purpose is to reduce the frequent saltus step of switch.
The bidirectional triode thyristor alternating current switching circuit that employing is of coupled connections by φ 3 red-light LEDs and photo resistance, optocoupler assembly: be directly to be coupled by LED and photo resistance, and with outer light Isolated Shield, the photo resistance two ends directly are connected with bidirectional triode thyristor G end, A2 end, both simplified the silicon controlled drive circuit, because photo resistance is to drive silicon controlled by change in resistance, the characteristic of soft start is arranged simultaneously, help device power supply (DPS) safety and self alternating current switching circuit safety.
When temperature is higher than when being provided with, the K of TL431 is 2V very, and optical coupling is loaded, the bidirectional triode thyristor conducting.
TL431 temperature upper limit alternating current switching circuit, power consumption in 1 milliwatt, adopt universal component less than oneself, low-power consumption, and low cost has purposes and meaning widely.
Claims (1)
1.TL431 the temperature upper limit alternating current switching circuit is characterized in that: the simple gate limit that adopts TL431 to have temperature-compensating relatively constitutes emperature emasuring and controlling circuit, the K utmost point of 3.8V power supply emitting led connection TL431 in optical coupling; 3.8V power supply connects the R utmost point of TL431 and passes through temperature setting element Rw through negative stability coefficient resistance Rt and is connected with the A utmost point of TL431 with capacitor C; The bidirectional triode thyristor alternating current switching circuit that employing is of coupled connections by φ 3 red-light LEDs and photo resistance, the optocoupler assembly is directly to be coupled by LED and photo resistance, and with outer light Isolated Shield, the photo resistance two ends are directly held with bidirectional triode thyristor G end, A2 and are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205039452U CN201742381U (en) | 2010-08-25 | 2010-08-25 | TL431 upper temperature limit alternating current switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205039452U CN201742381U (en) | 2010-08-25 | 2010-08-25 | TL431 upper temperature limit alternating current switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201742381U true CN201742381U (en) | 2011-02-09 |
Family
ID=43557661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205039452U Expired - Fee Related CN201742381U (en) | 2010-08-25 | 2010-08-25 | TL431 upper temperature limit alternating current switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201742381U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375785A (en) * | 2015-10-22 | 2016-03-02 | 珠海格力电器股份有限公司 | Household appliance and control circuit and method of switching power supply thereof |
-
2010
- 2010-08-25 CN CN2010205039452U patent/CN201742381U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375785A (en) * | 2015-10-22 | 2016-03-02 | 珠海格力电器股份有限公司 | Household appliance and control circuit and method of switching power supply thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110209 Termination date: 20120825 |