CN205657415U - Temperature measurement formula electric fire control detector protection circuit - Google Patents
Temperature measurement formula electric fire control detector protection circuit Download PDFInfo
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- CN205657415U CN205657415U CN201620490590.5U CN201620490590U CN205657415U CN 205657415 U CN205657415 U CN 205657415U CN 201620490590 U CN201620490590 U CN 201620490590U CN 205657415 U CN205657415 U CN 205657415U
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Abstract
The utility model discloses a temperature measurement formula electric fire control detector protection circuit, including temperature sensor R8, microprocessor MCU, temperature voltage linearizer, clamper protection circuit, isolated temperature compensating circuit, the filter circuit who is connected with microprocessor, the temperature the voltage linearizer is including resistance R3, R4, R6, R7, the clamper protection circuit is including two -way TVS pipe V2, V3, V4 and electric capacity C4, isolated temperature compensating circuit is including NPN type triode V1, filter circuit is including resistance R1, electric capacity C1, resistance R2, electric capacity C2. The utility model discloses detect technical field at electric fire, the protection of monitoring the detector to temperature measurement formula electric fire has the significance.
Description
Technical field:
This utility model belongs to electrical fire detection technique field, particularly to a kind of temp.-measuring type electrical fire-detector testing circuit.
Background technology:
Temperature-measuring-type electrical fire mainly monitors the temperature anomaly change of low-voltage distributing line junction or cable, the disaster hidden-trouble of electric wiring can be found in time, fire watch personnel are reminded to go to check, eliminate these hidden danger, electrical fire is eliminated in bud, thus avoids great loss.At present, it is readily incorporated high-voltage signal, interference signal during temperature-measuring-type electrical fire is actually used in temperature sensor junction, causes internal circuit to damage or operation irregularity, produce bigger hidden danger.
Utility model content:
The purpose of this utility model is to provide a kind of temperature-measuring-type electrical fire protection circuit, uses multiple input protection circuit, improves capacity of resisting disturbance.
The technical solution adopted in the utility model is:
A kind of temperature-measuring-type electrical fire protection circuit, it is characterised in that include temperature sensor R8, Micro-processor MCV, temperature-voltage linearizer, clamping protective circuit, isolated temperature compensate the filter circuit that circuit is connected with microprocessor；Described temperature-voltage linearizer includes resistance R3, R4, R6, R7; described clamping protective circuit includes two-way TVS pipe V2, V3, V4 and electric capacity C4; described isolated temperature compensates circuit and includes NPN type triode V1, and described filter circuit includes resistance R1, electric capacity C1, resistance R2, electric capacity C2；nullDescribed temperature sensor R8 two ends respectively with current-limiting resistance R6、R7 connects，In parallel with resistance R4 again，Then connect with resistance R3，Resistance R4 the most respectively with electric capacity C3、Two-way TVS pipe V4 is in parallel，One end of electric capacity C3 is by the base stage of node with NPN type triode V1、One end of two-way TVS pipe V2 connects，The other end ground connection of two-way TVS pipe V2，The colelctor electrode of NPN type triode V1 connects resettable fuse F1，The other end of resettable fuse F1 connects power supply VCC end，The emitter stage of NPN type triode V1 connects resistance R2，The other end ground connection of resistance R2，Resistance R2 and electric capacity C2、Electric capacity C1 parallel connection respectively，Series resistance R1 between electric capacity C2 and electric capacity C1，The two ends of electric capacity C1 are connected with Micro-processor MCV，Resistance R6 is connected with the one end having two-way TVS pipe V3 away from one end of temperature sensor R8，The other end having two-way TVS pipe V3 connects electric capacity C4，The electric capacity C4 other end picks shell greatly.
Described a kind of temperature-measuring-type electrical fire protection circuit, it is characterised in that described temperature sensor R8 uses NTC thermistor.
The utility model has the advantages that:
Temperature sensor of the present utility model is NTC thermistor; connect with resistance R6, R7 respectively in external NTC thermistor formula temperature sensor R8 two ends; in parallel with resistance R4 again; then connect with resistance R3; the temperature output voltage realizing temperature sensor detection is the most corresponding; resettable fuse F1 shielded when stream occurs in temperature signal testing circuit so that it is do not affect VCC voltage；
Clamping protective circuit of the present utility model is made up of two-way TVS diode V2, V3, V4, electric capacity C4; when crossing high external voltage by temperature sensor entrance testing circuit input; resistance R6, R7 carry out current limliting to input voltage; through TVS diode V2, V3, V4, line voltage signal is carried out clamper again; it is released to the earth by electric capacity C4; thus the input of temperature sensing circuit is carried out current limliting, clamper protection, can prevent high input voltage from temperature-measuring-type electrical fire internal circuit is produced damage；
The peering input signal of be of audion V1 plays insulation blocking effect; signal send MCU carry out A/D conversion; prevent high input voltage from damaging MCU port; be short-circuited at external temperature sensor, open circuit time; temperature signal testing circuit exports specific voltage; along with temperature raises, be knot pressure drop reduces, and temperature plays certain compensating action；Interference signal is strobed by electric capacity R1, R2, C1, C2.
A kind of temperature-measuring-type electrical fire protection circuit described in the utility model is in electrical fire detection technique field, and the protection to temperature-measuring-type electrical fire is significant.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Detailed description of the invention
As it is shown in figure 1, a kind of temperature-measuring-type electrical fire protection circuit, include temperature sensor R8, Micro-processor MCV, temperature-voltage linearizer, clamping protective circuit, isolated temperature compensate the filter circuit that circuit is connected with microprocessor；Described temperature-voltage linearizer includes resistance R3, R4, R6, R7; described clamping protective circuit includes two-way TVS pipe V2, V3, V4 and electric capacity C4; described isolated temperature compensates circuit and includes NPN type triode V1, and described filter circuit includes resistance R1, electric capacity C1, resistance R2, electric capacity C2；nullDescribed temperature sensor R8 two ends respectively with current-limiting resistance R6、R7 connects，In parallel with resistance R4 again，Then connect with resistance R3，Resistance R4 the most respectively with electric capacity C3、Two-way TVS pipe V4 is in parallel，One end of electric capacity C3 is by the base stage of node with NPN type triode V1、One end of two-way TVS pipe V2 connects，The other end ground connection of two-way TVS pipe V2，The colelctor electrode of NPN type triode V1 connects resettable fuse F1，The other end of resettable fuse F1 connects power supply VCC end，The emitter stage of NPN type triode V1 connects resistance R2，The other end ground connection of resistance R2，Resistance R2 and electric capacity C2、Electric capacity C1 parallel connection respectively，Series resistance R1 between electric capacity C2 and electric capacity C1，The two ends of electric capacity C1 are connected with Micro-processor MCV，Resistance R6 is connected with the one end having two-way TVS pipe V3 away from one end of temperature sensor R8，The other end having two-way TVS pipe V3 connects electric capacity C4，The electric capacity C4 other end picks shell greatly.
Temperature sensor R8 uses NTC thermistor.
Claims (2)
1. a temperature-measuring-type electrical fire protection circuit; it is characterized in that, include temperature sensor R8, Micro-processor MCV, temperature-voltage linearizer, clamping protective circuit, isolated temperature compensate the filter circuit that is connected with microprocessor of circuit；Described temperature-voltage linearizer includes resistance R3, R4, R6, R7; described clamping protective circuit includes two-way TVS pipe V2, V3, V4 and electric capacity C4; described isolated temperature compensates circuit and includes NPN type triode V1, and described filter circuit includes resistance R1, electric capacity C1, resistance R2, electric capacity C2；nullDescribed temperature sensor R8 two ends respectively with current-limiting resistance R6、R7 connects，In parallel with resistance R4 again，Then connect with resistance R3，Resistance R4 the most respectively with electric capacity C3、Two-way TVS pipe V4 is in parallel，One end of electric capacity C3 is by the base stage of node with NPN type triode V1、One end of two-way TVS pipe V2 connects，The other end ground connection of two-way TVS pipe V2，The colelctor electrode of NPN type triode V1 connects resettable fuse F1，The resettable fuse F1 other end connects power supply VCC end，The emitter stage of NPN type triode V1 connects resistance R2，The other end ground connection of resistance R2，Resistance R2 and electric capacity C2、Electric capacity C1 parallel connection respectively，Series resistance R1 between electric capacity C2 and electric capacity C1，The two ends of electric capacity C1 are connected with Micro-processor MCV，Resistance R6 is connected with the one end having two-way TVS pipe V3 away from one end of temperature sensor R8，The other end having two-way TVS pipe V3 connects electric capacity C4，The electric capacity C4 other end picks shell greatly.
A kind of temperature-measuring-type electrical fire protection circuit the most according to claim 1, it is characterised in that described temperature sensor R8 uses NTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620490590.5U CN205657415U (en) | 2016-05-20 | 2016-05-20 | Temperature measurement formula electric fire control detector protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620490590.5U CN205657415U (en) | 2016-05-20 | 2016-05-20 | Temperature measurement formula electric fire control detector protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205657415U true CN205657415U (en) | 2016-10-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620490590.5U Expired - Fee Related CN205657415U (en) | 2016-05-20 | 2016-05-20 | Temperature measurement formula electric fire control detector protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205657415U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993961A (en) * | 2021-03-18 | 2021-06-18 | 东莞永胜医疗制品有限公司 | Heating circuit protection circuit, breathing heating circuit and breathing auxiliary equipment |
-
2016
- 2016-05-20 CN CN201620490590.5U patent/CN205657415U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993961A (en) * | 2021-03-18 | 2021-06-18 | 东莞永胜医疗制品有限公司 | Heating circuit protection circuit, breathing heating circuit and breathing auxiliary equipment |
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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: 20161019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |