CN204856797U - Point type temperature sensing fire detection circuit - Google Patents
Point type temperature sensing fire detection circuit Download PDFInfo
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- CN204856797U CN204856797U CN201520563140.XU CN201520563140U CN204856797U CN 204856797 U CN204856797 U CN 204856797U CN 201520563140 U CN201520563140 U CN 201520563140U CN 204856797 U CN204856797 U CN 204856797U
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Abstract
The utility model relates to a circuit control technical field is a point type temperature sensing fire detection circuit particularly, and the circuit includes signal input circuit, signal feedback loop, voltage conversion circuit, signal shaping circuit, three -terminal voltage stabilizing circuit, temperature sensor circuit, main chip U2 and peripheral circuit, signal input circuit be equipped with the nonpolarity input of two signal bus, behind the input one end connecting resistance R27 and the rectifier bridge rectification succeeding crop that parallelly connected rectifier diode D1, D5, D6 and D7 form between another input for circuit supply power positive negative pole S+ and S - to parallelly connected each circuit is its power supply in proper order. The sensitivity of this circuit is high, uses extensively, has guaranteed the low -power consumption in whole piece return circuit under the reliable prerequisite of circuit, and the temperature sensor circuit can accurately forecast the fire alarm, avoids the wrong report and fails to report the phenomenon.
Description
[technical field]
The utility model relates to technical field of circuit control, specifically a kind of point-type temperature-sensing fire detecting circuit.
[background technology]
Along with the development of China's modernization construction, the construction of all kinds industrial building is accelerated development, and in process of construction, is especially more and more valued by the people the strick precaution of fire.Fire detector is in fire automatic alarm system, detects scene, finds the equipment of fire.Fire detector is divided into by the information acquisition type at scene: smoke detector, heat detector, flame detector etc., its effect monitors the generation whether having fire in environment, once there be the condition of a fire, just by the feature physical quantity of fire, as temperature, smog, gas and radiation light intensity etc. convert electric signal to, and action sends alerting signal to fire alarm control unit immediately, sensor circuit is an of paramount importance part in fire detector circuit, and the reliability of sensor circuit directly affects the performance of whole detector.
[summary of the invention]
The purpose of this utility model is to provide a kind of reliable and stable point-type temperature-sensing fire detecting circuit to automatic fire alarm system.
To achieve these goals, design a kind of point-type temperature-sensing fire detecting circuit, described circuit comprises signal input circuit, signal feedback loop, voltage conversion circuit, signal transformation circuit, three-terminal voltage-stabilizing circuit, temperature sensor circuit, master chip U2 and peripheral circuit thereof, described signal input circuit is provided with the nonpolarity input end of two signal buss, commutation diode D1 in parallel with between another input end after input one end contact resistance R27, D5, the rectifier bridge of D6 and D7 composition, to power both positive and negative polarity S+ and S-as circuit after rectifier bridge rectification through the signal of signal bus nonpolarity input end input, and parallel signal backfeed loop successively, voltage conversion circuit, signal transformation circuit, three-terminal voltage-stabilizing circuit, temperature sensor circuit is its power supply, rectifier bridge two ends parallel resistance RT1, resistance RT1 two ends parallel resistance R1 and LED 1, the collector of the negative pole connecting triode T1 of LED 1, connect No. 6 ALAM ends of master chip U2 after the base stage connecting resistance R12 of triode T1, the emitter of triode T1 meets power supply negative pole S-.
Described signal back route resistance R2, R5, R6, R14 and triode T2, T8 composition, power supply positive pole S+ contact resistance R2, the emitter of the other end connecting triode T8 of resistance R2, the collector of the base stage connecting triode T2 of triode T8, No. 5 pin ANS connecting master chip U2 after the base stage contact resistance R6 of triode T2 hold, and ground connection after the contact resistance R14 of tap one end, meet the negative pole S-that powers after the emitter of triode T2 and the collector of triode T8 merge contact resistance R5.
Described voltage conversion circuit is made up of resistance R3, electric capacity C1, C4, stabilivolt Z2, triode T3, the collector of power supply positive pole S+ connecting triode T3, contact resistance R3 between the collector of triode T3 and base stage, power supply negative pole S-is met after the base stage connection stabilivolt Z2 of triode T3, power supply negative pole S-is met after the emitter connection electric capacity C4 of stabilivolt Z2 two ends shunt capacitance C1, triode T3.
Described signal transformation circuit is made up of resistance R9, R10, R21, electric capacity C6, C11 and triode T5, power supply positive pole S+ connects electric capacity C6, resistance R9, R21, R10, resistance R21, R10 two ends shunt capacitance C11, the base stage of connecting triode T5 between resistance R21 and resistance R10, the collector contact resistance R13 of triode T5, and extract No. 7 DATA pins that one end is connected to master chip U2 out, the emitter of triode T5 meets power supply negative pole S-.
Described three-terminal voltage-stabilizing electricity routing resistance R15, R13, electric capacity C2, C5 and voltage stabilizer U1 form, the emitter contact resistance R15 of triode T3, No. 2 pin Vin that the resistance R15 other end connects voltage stabilizer U1 hold, the negative pole S-that powers is met after being connected electric capacity C2 between No. 2 end Vin hold with No. 1 pin GND, No. 3 pin Vout of voltage stabilizer U1 hold and connect power Vcc, No. 3 pin Vout of voltage stabilizer U1 are connected electric capacity C5 between holding and holding with No. 1 pin GND, and draw one end and be connected to master chip U2 and peripheral circuit thereof.
Described temperature sensor circuit is made up of resistance R7, thermistor R8 and electric capacity C3, resistance R7 one end connects high level voltage Vcc, the other end connects thermistor R8, between resistance R7, thermistor R8, No. 11 pin AD of tap one end connection master chip U2 hold, thermistor R8 two ends shunt capacitance C3.
Described master chip U2 and peripheral circuit thereof comprise master chip U2, resistance R17, R16, R4 and electric capacity C16, C8, No. 8 pin TEST1 being connected to master chip U2 after the signal contact resistance R17 of No. 3 pin Vout ends output of voltage stabilizer U1 hold, and tap one end contact resistance R4, No. 4 pin U2-4 that the resistance R4 other end connects master chip U2 hold, No. 4 pins of master chip U2 are separately extracted out after one end connects electric capacity C8 and are met power supply negative pole S-, No. 1 pin Vcc end of master chip U2 is connected electric capacity C16 with between No. 14 pin Vss, resistance R17 two ends shunt capacitance C7, and be connected to WAdd after the contact resistance R16 of tap one end.
This circuit sensitivity is high, be widely used, by voltage conversion circuit, bus voltage is stablized output valve and be converted to 7.5V by 24V, under the reliable prerequisite of circuit, ensure that the low-power consumption in whole piece loop, temperature sensor circuit can forecast with unerring accuracy fire alarm, avoids wrong report and fails to report phenomenon, during temperature variation, resistance R8 resistance respective change, make the voltage exporting master chip U2AD end to also follow temperature variation, the temperature value reaching regulation then produces fire alarm signal.
[accompanying drawing explanation]
Fig. 1 is the circuit theory diagrams of master chip in the utility model;
Specify Fig. 1 as Figure of abstract of the present utility model.
[embodiment]
Below in conjunction with accompanying drawing, the utility model is described in further detail, and the structure of this circuit and principle are very clearly concerning the people of this specialty.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, point-type temperature-sensing fire detecting circuit comprises signal input circuit (in figure region A), signal feedback loop (in figure region B), voltage conversion circuit (in figure region C), signal transformation circuit (in figure region D), three-terminal voltage-stabilizing circuit (in figure region E), temperature sensor circuit (in figure region F), master chip U2 and peripheral circuit (region, figure middle and lower part) thereof.
Signal input circuit is provided with the nonpolarity input end of two signal buss, commutation diode D1 in parallel with between another input end after input one end contact resistance R27, D5, the rectifier bridge of D6 and D7 composition, to power both positive and negative polarity S+ and S-as circuit after rectifier bridge rectification through the signal of signal bus nonpolarity input end input, and parallel signal backfeed loop according to this, voltage conversion circuit, signal transformation circuit, three-terminal voltage-stabilizing circuit, temperature sensor circuit is its power supply, rectifier bridge two ends parallel resistance RT1, resistance RT1 two ends parallel resistance R1 and LED 1, the collector of the negative pole connecting triode T1 of LED 1, No. 6 ALAM ends of master chip U2 are connect after the base stage connecting resistance R12 of triode T1, the emitter of triode T1 meets power supply negative pole S-.
Signal back route resistance R2, R5, R6, R14 and triode T2, T8 composition, power supply positive pole S+ contact resistance R2, the emitter of the other end connecting triode T8 of resistance R2, the collector of the base stage connecting triode T2 of triode T8, No. 5 pin ANS connecting master chip U2 after the base stage contact resistance R6 of triode T2 hold, and ground connection after the contact resistance R14 of tap one end, meet the negative pole S-that powers after the emitter of triode T2 and the collector of triode T8 merge contact resistance R5.Signal returns code as an electrical current, is controlled by the ANS signal of the output of master chip U2, during ANS=1, and marking current=(the Vcc-Vbe)/75=35mA of the upper feedback of S+; During ANS=0, triode T2, T8 end, and no signal current feeds back.
Voltage conversion circuit is wherein 7.5V by 24V photovoltaic conversion, it is made up of resistance R3, electric capacity C1, C4, stabilivolt Z2, triode T3, the collector of power supply positive pole S+ connecting triode T3, contact resistance R3 between the collector of triode T3 and base stage, power supply negative pole S-is met after the base stage connection stabilivolt Z2 of triode T3, power supply negative pole S-is met after the emitter connection electric capacity C4 of stabilivolt Z2 two ends shunt capacitance C1, triode T3.
Signal transformation circuit is as the level conversion in loop, signal shaping, improve the reliability of detection circuit, avoid the impact of outside environmental elements, this electric routing resistance R9, R10, R21, electric capacity C6, C11 and triode T5 forms, power supply positive pole S+ connects electric capacity C6, resistance R9, R21, R10, resistance R21, R10 two ends shunt capacitance C11, the base stage of connecting triode T5 between resistance R21 and resistance R10, the collector contact resistance R13 of triode T5, and extract No. 7 DATA pins that one end is connected to master chip U2 out, the emitter of triode T5 meets power supply negative pole S-, wherein electric capacity C6 is capacitance, DC component in isolation bus.
Three-terminal voltage-stabilizing circuit is the Vcc power supply of whole circuit with stable, by resistance R15, R13, electric capacity C2, C5 and voltage stabilizer U1 forms, U1 adopts the SGM2200 of 3.3V, it is withstand voltage the highlyest can reach 32V, and quiescent current is extra small, be only 1.7uA, the emitter contact resistance R15 of triode T3, No. 2 pin Vin that the resistance R15 other end connects voltage stabilizer U1 hold, the negative pole S-that powers is met after being connected electric capacity C2 between No. 2 end Vin hold with No. 1 pin GND, No. 3 pin Vout of voltage stabilizer U1 hold and connect power Vcc, No. 3 pin Vout of voltage stabilizer U1 are connected electric capacity C5 between holding and holding with No. 1 pin GND, and draw one end and be connected to master chip U2 and peripheral circuit thereof.
Temperature sensor circuit is made up of resistance R7, thermistor R8 and electric capacity C3, resistance R7 one end connects high level voltage Vcc, the other end connects thermistor R8, and between resistance R7, thermistor R8, No. 11 pin AD of tap one end connection master chip U2 hold, thermistor R8 two ends shunt capacitance C3.During temperature variation, resistance R8 resistance respective change, the voltage that the AD of No. 11 pins exporting master chip U2 to is held also follows temperature variation, and the temperature value reaching regulation then produces fire alarm signal.
Master chip U2 and peripheral circuit thereof comprise master chip U2, resistance R17, R16, R4 and electric capacity C16, C8, No. 8 pin TEST1 being connected to master chip U2 after the signal contact resistance R17 of No. 3 pin Vout ends output of voltage stabilizer U1 hold, and tap one end contact resistance R4, No. 4 pin U2-4 that the resistance R4 other end connects master chip U2 hold, No. 4 pins of master chip U2 are separately extracted out after one end connects electric capacity C8 and are met power supply negative pole S-, No. 1 pin Vcc end of master chip U2 is connected electric capacity C16 with between No. 14 pin Vss, resistance R17 two ends shunt capacitance C7, and be connected to WAdd after the contact resistance R16 of tap one end.
Claims (7)
1. a point-type temperature-sensing fire detecting circuit, is characterized in that described circuit comprises signal input circuit, signal feedback loop, voltage conversion circuit, signal transformation circuit, three-terminal voltage-stabilizing circuit, temperature sensor circuit, master chip U2 and peripheral circuit thereof, described signal input circuit is provided with the nonpolarity input end of two signal buss, commutation diode D1 in parallel with between another input end after input one end contact resistance R27, D5, the rectifier bridge of D6 and D7 composition, to power both positive and negative polarity S+ and S-as circuit after rectifier bridge rectification through the signal of signal bus nonpolarity input end input, and parallel signal backfeed loop successively, voltage conversion circuit, signal transformation circuit, three-terminal voltage-stabilizing circuit, temperature sensor circuit is its power supply, rectifier bridge two ends parallel resistance RT1, resistance RT1 two ends parallel resistance R1 and LED 1, the collector of the negative pole connecting triode T1 of LED 1, connect No. 6 ALAM ends of master chip U2 after the base stage connecting resistance R12 of triode T1, the emitter of triode T1 meets power supply negative pole S-.
2. a kind of point-type temperature-sensing fire detecting circuit as claimed in claim 1, it is characterized in that described signal back route resistance R2, R5, R6, R14 and triode T2, T8 forms, power supply positive pole S+ contact resistance R2, the emitter of the other end connecting triode T8 of resistance R2, the collector of the base stage connecting triode T2 of triode T8, No. 5 pin ANS connecting master chip U2 after the base stage contact resistance R6 of triode T2 hold, and ground connection after the contact resistance R14 of tap one end, the negative pole S-that powers is met after the emitter of triode T2 and the collector of triode T8 merge contact resistance R5.
3. a kind of point-type temperature-sensing fire detecting circuit as claimed in claim 1, it is characterized in that described voltage conversion circuit is made up of resistance R3, electric capacity C1, C4, stabilivolt Z2, triode T3, the collector of power supply positive pole S+ connecting triode T3, contact resistance R3 between the collector of triode T3 and base stage, power supply negative pole S-is met after the base stage connection stabilivolt Z2 of triode T3, power supply negative pole S-is met after the emitter connection electric capacity C4 of stabilivolt Z2 two ends shunt capacitance C1, triode T3.
4. a kind of point-type temperature-sensing fire detecting circuit as claimed in claim 1, it is characterized in that described signal transformation circuit is made up of resistance R9, R10, R21, electric capacity C6, C11 and triode T5, power supply positive pole S+ connects electric capacity C6, resistance R9, R21, R10, resistance R21, R10 two ends shunt capacitance C11, the base stage of connecting triode T5 between resistance R21 and resistance R10, the collector contact resistance R13 of triode T5, and extract No. 7 DATA pins that one end is connected to master chip U2 out, the emitter of triode T5 meets power supply negative pole S-.
5. a kind of point-type temperature-sensing fire detecting circuit as claimed in claim 1, it is characterized in that described three-terminal voltage-stabilizing electricity routing resistance R15, R13, electric capacity C2, C5 and voltage stabilizer U1 forms, the emitter contact resistance R15 of triode T3, No. 2 pin Vin that the resistance R15 other end connects voltage stabilizer U1 hold, the negative pole S-that powers is met after being connected electric capacity C2 between No. 2 end Vin hold with No. 1 pin GND, No. 3 pin Vout of voltage stabilizer U1 hold and connect power Vcc, No. 3 pin Vout of voltage stabilizer U1 are connected electric capacity C5 between holding and holding with No. 1 pin GND, and draw one end and be connected to master chip U2 and peripheral circuit thereof.
6. a kind of point-type temperature-sensing fire detecting circuit as claimed in claim 1, it is characterized in that described temperature sensor circuit is made up of resistance R7, thermistor R8 and electric capacity C3, resistance R7 one end connects high level voltage Vcc, the other end connects thermistor R8, between resistance R7, thermistor R8, No. 11 pin AD of tap one end connection master chip U2 hold, thermistor R8 two ends shunt capacitance C3.
7. a kind of point-type temperature-sensing fire detecting circuit as claimed in claim 1, it is characterized in that described master chip U2 and peripheral circuit thereof comprise master chip U2, resistance R17, R16, R4 and electric capacity C16, C8, No. 8 pin TEST1 being connected to master chip U2 after the signal contact resistance R17 of No. 3 pin Vout ends output of voltage stabilizer U1 hold, and tap one end contact resistance R4, No. 4 pin U2-4 that the resistance R4 other end connects master chip U2 hold, No. 4 pins of master chip U2 are separately extracted out after one end connects electric capacity C8 and are met power supply negative pole S-, No. 1 pin Vcc end of master chip U2 is connected electric capacity C16 with between No. 14 pin Vss, resistance R17 two ends shunt capacitance C7, and be connected to WAdd after the contact resistance R16 of tap one end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520563140.XU CN204856797U (en) | 2015-07-30 | 2015-07-30 | Point type temperature sensing fire detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520563140.XU CN204856797U (en) | 2015-07-30 | 2015-07-30 | Point type temperature sensing fire detection circuit |
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| CN204856797U true CN204856797U (en) | 2015-12-09 |
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| CN201520563140.XU Active CN204856797U (en) | 2015-07-30 | 2015-07-30 | Point type temperature sensing fire detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109389796A (en) * | 2018-12-05 | 2019-02-26 | 无锡蓝天电子股份有限公司 | A kind of nonpolarity double bus temp.-measuring type fire detector |
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2015
- 2015-07-30 CN CN201520563140.XU patent/CN204856797U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109389796A (en) * | 2018-12-05 | 2019-02-26 | 无锡蓝天电子股份有限公司 | A kind of nonpolarity double bus temp.-measuring type fire detector |
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