CN202421918U - Thermal protection circuit - Google Patents
Thermal protection circuit Download PDFInfo
- Publication number
- CN202421918U CN202421918U CN2011205258774U CN201120525877U CN202421918U CN 202421918 U CN202421918 U CN 202421918U CN 2011205258774 U CN2011205258774 U CN 2011205258774U CN 201120525877 U CN201120525877 U CN 201120525877U CN 202421918 U CN202421918 U CN 202421918U
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- CN
- China
- Prior art keywords
- thermal protection
- protection circuit
- thermistor
- circuit
- microcontroller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Control Of Voltage And Current In General (AREA)
Abstract
The utility model relates to a thermal protection circuit. The thermal protection circuit comprises a voltage division circuit and a microcontroller, wherein the microcontroller is connected with the voltage division circuit and used for regulating and controlling the output power of electric appliances. The utility model provides a thermal protection circuit, which can monitor the working environment of the circuit and effectively regulate and control the working environment of the circuit.
Description
Technical field
The utility model belongs to electricity field, relates to a kind of thermal protection circuit.
Background technology
At present for the ballast resistor of various models, the working environment of himself circuit is not monitored working environment that can not circuit for regulating and controlling in its use; Therefore when the ballast resistor of various models carries out work; Can not protect lamp effectively, burn out easily, serviceable life is short.
The utility model content
In order to solve the above-mentioned technical matters that exists in the background technology, the utility model provides a kind of and can monitor and the effective thermal protection circuit of circuit for regulating and controlling working environment the working environment of self circuit.
The technical solution of the utility model is: the utility model provides a kind of thermal protection circuit, and its special character is: said thermal protection circuit comprises the microcontroller that bleeder circuit and being used for of linking to each other with bleeder circuit are regulated and control the output power of electrical appliance.
Above-mentioned bleeder circuit comprises electric capacity, first resistance and thermistor; After connecting with first resistance, the end ground connection that said electric capacity is parallelly connected with thermistor, the other end inserts microcontroller.
Above-mentioned thermistor is the thermistor of negative temperature coefficient.
The model of above-mentioned microcontroller is the PIC16 Series chip.
The utility model has the advantages that:
The thermistor that the utility model is used for negative temperature coefficient changes the dividing potential drop at resistance two ends.The logical microcontroller of this voltage is handled the back and is changed the frequency generator output frequency, and then changes the loaded work piece frequency; Change output power and regulate temperature, when the ballast operation environment temperature surpasses preset temperature, ballast resistor will reduce the output power of lamp, lower up to temperature, even will quit work, to reduce the plank temperature; And when the ballast operation environment temperature was lower than preset temperature, ballast resistor was operate as normal, not only can monitor effectively circuit for regulating and controlling working environment to the working environment of self circuit, and is safe and reliable, very convenient.
Description of drawings
Fig. 1 is the circuit theory diagrams of the thermal protection circuit that provides of the utility model.
Embodiment
Referring to Fig. 1, the utility model provides a kind of thermal protection circuit, and this circuit comprises the bleeder circuit that is made up of the thermistor and first resistance, the microcontroller that being used for of linking to each other with bleeder circuit regulated and control the output power of electrical appliance.Bleeder circuit comprises electric capacity, first resistance and thermistor; The end ground connection that electric capacity is parallelly connected with thermistor, the other end with insert microcontroller after first resistance is parallelly connected.Here, resistance and thermistor are formed the resistance bleeder circuit of connecting, and electric capacity is in order to stablize the voltage at thermistor two ends.
Thermistor is the thermistor of negative temperature coefficient, and the model of microcontroller can be PIC16F886 or other PIC16 Series chip.
The utility model is when concrete work, and at normal temperatures, the resistance of thermistor is certain.The bleeder circuit that its RT3 and R60 form, magnitude of voltage is fixed on the RT3 resistance.When the ambient temperature rising, the resistance of RT3 resistance is also corresponding to be reduced, and the partial pressure value that obtains on it is also descending.When ambient temperature rises to certain value, when the last partial pressure value of RT3 is lower than the value of microcontroller inner setting, just, the power of lamp is reduced by the 13 pin output control signal corresponding of microcontroller, to reduce thermal value, reduce ambient temperature.The partial pressure value that RT3 is last, the 5 pin sampling of logical microcontroller, during greater than the inner setting value, the 13 pin output control signal corresponding by microcontroller makes lamp recover the full power operation state.By changing controller 5 pin sampling current potential after the NTC resistance induction ambient temperature; 13 pin signals output after the signal Processing; Change the frequency generator output frequency; Change the loaded work piece frequency; Change output power and regulate temperature.
For example, when the ballast operation environment temperature is spent above 85, ballast resistor will be controlled lamp output power to 50%, lower up to temperature.If temperature surpasses 90 degree, ballast resistor will quit work.If temperature is below 85 degree, ballast resistor is with operate as normal.
Claims (4)
1. thermal protection circuit is characterized in that: said thermal protection circuit comprises the microcontroller that bleeder circuit and being used for of linking to each other with bleeder circuit are regulated and control the output power of electrical appliance.
2. thermal protection circuit according to claim 1 is characterized in that: said bleeder circuit comprises electric capacity, first resistance and thermistor; The end ground connection that said electric capacity is parallelly connected with thermistor, the other end with insert microcontroller after first resistance is parallelly connected.
3. thermal protection circuit according to claim 2 is characterized in that: said thermistor is the thermistor of negative temperature coefficient.
4. according to claim 1 or 2 or 3 described thermal protection circuits, it is characterized in that: said microcontroller is the PIC16 Series chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205258774U CN202421918U (en) | 2011-12-14 | 2011-12-14 | Thermal protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205258774U CN202421918U (en) | 2011-12-14 | 2011-12-14 | Thermal protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202421918U true CN202421918U (en) | 2012-09-05 |
Family
ID=46746662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205258774U Expired - Fee Related CN202421918U (en) | 2011-12-14 | 2011-12-14 | Thermal protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202421918U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796402A (en) * | 2013-11-07 | 2014-05-14 | 福建睿能科技股份有限公司 | Over-voltage and under-voltage protection circuit, electronic ballast and over-voltage and under-voltage detection method thereof |
| CN107681631A (en) * | 2016-08-01 | 2018-02-09 | 观致汽车有限公司 | A kind of thermal protection system and method for axial fan steady resistance circuit |
-
2011
- 2011-12-14 CN CN2011205258774U patent/CN202421918U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796402A (en) * | 2013-11-07 | 2014-05-14 | 福建睿能科技股份有限公司 | Over-voltage and under-voltage protection circuit, electronic ballast and over-voltage and under-voltage detection method thereof |
| CN103796402B (en) * | 2013-11-07 | 2016-02-03 | 福建睿能科技股份有限公司 | Over-and under-voltage protective circuit, electric ballast and over-and under-voltage detection method thereof |
| CN107681631A (en) * | 2016-08-01 | 2018-02-09 | 观致汽车有限公司 | A kind of thermal protection system and method for axial fan steady resistance circuit |
| CN107681631B (en) * | 2016-08-01 | 2019-10-18 | 观致汽车有限公司 | A kind of thermal protection system and method for axial fan steady resistance 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 |
Granted publication date: 20120905 Termination date: 20181214 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |