CN205719319U - A kind of temperature sensing circuit - Google Patents
A kind of temperature sensing circuit Download PDFInfo
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- CN205719319U CN205719319U CN201620125098.8U CN201620125098U CN205719319U CN 205719319 U CN205719319 U CN 205719319U CN 201620125098 U CN201620125098 U CN 201620125098U CN 205719319 U CN205719319 U CN 205719319U
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Abstract
The application provides a kind of temperature sensing circuit, including: signal sample circuit, the input jointing temp sensor of signal sample circuit, for the resistance signal of temperature sensor being converted into initial voltage signal and exporting, the input of signal sample circuit is the input of temperature measuring circuit；Signal amplification circuit, the input of signal amplification circuit is connected with the outfan of signal sample circuit, and for initial voltage signal being amplified, and the voltage signal that amplifies after amplifying exports from the outfan of signal amplification circuit；Voltage-current converter circuit, the input of voltage-current converter circuit is connected with the outfan of signal amplification circuit, for amplification voltage signal is converted into current signal, and current signal is exported from the outfan of voltage-current converter circuit, the outfan of temperature measuring circuit is drawn from the outfan of voltage-current converter circuit.Achieve the data interaction between host computer and temperature sensor.
Description
Technical field
This utility model relates to temperature testing equipment technical field, more particularly, it relates to a kind of temperature sensing circuit.
Background technology
In industrial control system, in order to ensure that measured system or equipment works within the temperature range of allowing, need the temperature information of real-time measurement system or equipment, generally use temperature sensor that the temperature of measured system is measured, temperature data measurement obtained sends to host computer, and the temperature information of described measured system is adjusted by the temperature data that host computer obtains according to described temperature sensor measurement again.
But, host computer is generally difficult to directly read the output signal of described temperature sensor, it is thus desirable to use corresponding change-over circuit that the output signal of described temperature sensor is converted to the signal that host computer is capable of identify that, therefore, how to realize the data interaction between host computer and temperature sensor, become one of those skilled in the art's technical problem urgently to be resolved hurrily.
Utility model content
In view of this, this utility model embodiment provides a kind of temperature sensing circuit, to realize the data interaction between host computer and temperature sensor.
For achieving the above object, the following technical scheme of this utility model embodiment offer:
A kind of temperature sensing circuit, including:
Signal sample circuit, the input jointing temp sensor of described signal sample circuit, for the resistance signal of temperature sensor is converted into initial voltage signal, and described initial voltage signal is exported from the outfan of described signal sample circuit, the input of described signal sample circuit is the input of described temperature sensing circuit；
Signal amplification circuit, the input of described signal amplification circuit is connected with the outfan of described signal sample circuit, and for described initial voltage signal being amplified, and the voltage signal that amplifies after amplifying exports from the outfan of described signal amplification circuit；
Current/charge-voltage convertor, the input of described current/charge-voltage convertor is connected with the outfan of described signal amplification circuit, for described amplification voltage signal is converted into current signal, and described current signal is exported from the outfan of described current/charge-voltage convertor, the outfan of described temperature sensing circuit is drawn from the outfan of described current/charge-voltage convertor.
Preferably, in said temperature testing circuit, described temperature sensing circuit also includes an adjustable resistance branch road, and described adjustable resistance branch road is connected between the outfan of described current/charge-voltage convertor and the outfan of described temperature sensing circuit.
Preferably, in said temperature testing circuit, described temperature sensing circuit also includes a reference voltage-stabilizing circuit, and the voltage output end of described reference voltage-stabilizing circuit provides burning voltage for described temperature sensing circuit.
Preferably, in said temperature testing circuit, described reference voltage-stabilizing circuit includes a reference voltage chip, and the voltage-regulation end of described reference voltage chip is connected to the outfan of described temperature sensing circuit by the 6th resistance.
Preferably, in said temperature testing circuit, described signal sample circuit constitutes bridge circuit after being connected with temperature sensor, described bridge circuit comprises the first brachium pontis and the second brachium pontis, described first brachium pontis includes the first resistance of series connection and described temperature sensor, one end that described temperature sensor is connected with described first resistance is as the first sampled output of described signal sample circuit, the other end of described temperature sensor is connected with the outfan of described temperature sensing circuit, described second brachium pontis includes the second resistance and the 3rd resistance of series connection, the common port of described second resistance and the 3rd resistance is as the second sampled output of described signal sample circuit.
Preferably, in said temperature testing circuit, described bridge circuit also includes a potentiometer, and the voltage output end of described reference voltage-stabilizing circuit is connected with the mobile contact of described potentiometer, provides reference voltage for described bridge circuit.
Preferably, in said temperature testing circuit, described signal amplification circuit comprises an amplifier, the in-phase input end of described amplifier is connected with described first sampled output, the inverting input of described amplifier is connected with described second sampled output, the negative power end of described amplifier is connected with the outfan of described temperature sensing circuit, and the outfan of described amplifier is as the outfan of described signal amplification circuit.
Preferably, in said temperature testing circuit, described temperature sensing circuit also includes a positive feedback linearity circuit, and described positive feedback linearity circuit is connected between the outfan of described current/charge-voltage convertor and the in-phase input end of described operational amplifier.
Preferably, in said temperature testing circuit, described temperature sensing circuit also includes a Current Negative Three-Point Capacitance correcting circuit, and described Current Negative Three-Point Capacitance correcting circuit is connected between the outfan of described current/charge-voltage convertor and the inverting input of described operational amplifier.
Preferably, in said temperature testing circuit, described current/charge-voltage convertor comprises at least one NPN type triode, wherein, the base stage of described audion is as the input of described current/charge-voltage convertor, and be connected with the outfan of described signal amplification circuit, the emitter stage of described audion is as the outfan of described current/charge-voltage convertor.
Based on technique scheme, said temperature testing circuit passes sequentially through signal sample circuit 100, signal amplification circuit 200 and current/charge-voltage convertor 300, the resistance signal that described temperature sensor exports is converted into the current signal that host computer is capable of identify that, it is achieved that the data transmission between described temperature sensor and host computer.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the structural representation of a kind of temperature sensing circuit disclosed in the embodiment of the present application.
Fig. 2 is the structural representation of a kind of temperature sensing circuit disclosed in another embodiment of the application；
Fig. 3 is the structural representation of a kind of temperature sensing circuit disclosed in another embodiment of the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
This application discloses a kind of temperature sensing circuit, for the output signal of sensor is converted to the signal that host computer is capable of identify that, see Fig. 1, this temperature sensing circuit includes:
Signal sample circuit 100, the input jointing temp sensor of described signal sample circuit 100, for the resistance signal of temperature sensor is converted into initial voltage signal, and described initial voltage signal is exported from the outfan of described signal sample circuit 100, the input that input is described temperature sensing circuit of described signal sample circuit 100；
Signal amplification circuit 200, the input of described signal amplification circuit 200 is connected with the outfan of described signal sample circuit 100, for described initial voltage signal being amplified, and the voltage signal that amplifies after amplifying exports from the outfan of described signal amplification circuit 200；
Current/charge-voltage convertor 300, the input of described current/charge-voltage convertor 300 is connected with the outfan of described signal amplification circuit 200, for described amplification voltage signal is converted into current signal, and described current signal is exported from the outfan of described current/charge-voltage convertor 300, the outfan of described temperature sensing circuit is drawn from the outfan of described current/charge-voltage convertor 300.
Visible by scheme disclosed in the above embodiments of the present application, said temperature testing circuit passes sequentially through signal sample circuit 100, signal amplification circuit 200 and current/charge-voltage convertor 300, the resistance signal that described temperature sensor exports is converted into the current signal that host computer is capable of identify that, it is achieved that the data transmission between described temperature sensor and host computer.
Described temperature sensing circuit also includes a reference voltage-stabilizing circuit 600, and the voltage output end of described reference voltage-stabilizing circuit 600 provides burning voltage for described temperature sensing circuit.Such as, the voltage output end of described reference voltage-stabilizing circuit 600 provides described reference voltage for described signal sample circuit 100.
Temperature sensing circuit is widely used in modern industry TT&C system, it can coordinate temperature sensor (thermal resistance or thermocouple) that temperature signal can be converted into the signal of telecommunication linearly, the signal that dsp processor can identify is become again through processing of circuit, it is generally used to monitor the temperature information of measured system or equipment, to ensure that measured system or equipment works within the temperature range of allowing.
The output of current temperature sensing circuit is divided into two kinds: a kind of be output signal be the temperature sensing circuit of voltage signal, its output voltage signal be usually 0-5V；Another kind be output signal be the temperature sensing circuit of current signal, its output current signal be usually 4-20mA, this temperature sensing circuit is capable of long-distance transmissions and has higher capacity of resisting disturbance.
For being directed to the temperature sensing circuit that output signal commonly used in the prior art is current signal, affect degree of accuracy multiple because have of the temperature information that temperature sensing circuit is surveyed eventually, specifically include that 1., due to the individual variation between the particularly IC chip of the electronic device in circuit, the technical parameter causing each electronic device is different, and the electric current of output therefore can be caused to there is certain deviation；2., circuit work time, if the temperature of surrounding changes, due to the characteristic of IC chip self, himself parameter can variation with temperature and change, i.e. temperature drift phenomenon, also result in output curent change and unstable；Special envoy is to cash obvious reason at powered on moment, can be more complicated at the momentary conditions powered on, the momentary fluctuation of the supply voltage that can exist, and electric current output can be made more unstable；3., conventional temperature sensor is PT100, its characteristic is to be output as changing with variation with temperature, is output as resistance value, when temperature raises from A-B, its resistance value can rise, when not being to change with the linear change of temperature, also exist non-linear, i.e. 0.38% (PT100 self-characteristic), the temperature sensing circuit of conventional current signal output, if do not used special handling, will introduce that this is non-linear, what the electric current of output can not be linear follows variations in temperature and changes.It is directed to this, see Fig. 2, described temperature sensing circuit includes an adjustable resistance branch road 700, described adjustable resistance branch road 700 is connected between outfan and the outfan of described temperature sensing circuit of described current/charge-voltage convertor 300, by the resistance value regulating described adjustable resistance branch road 700, described temperature sensing circuit is carried out zero point regulation, to prevent because of the individuation difference of each device in circuit, cause the phenomenon exporting current deviation.Described temperature sensing circuit also includes a positive feedback linearity circuit 400, and described positive feedback linearity circuit 400 is connected between outfan and the in-phase input end of described amplifier U1 of described current/charge-voltage convertor 300.Described temperature sensing circuit also includes a Current Negative Three-Point Capacitance correcting circuit 500, and described Current Negative Three-Point Capacitance correcting circuit 500 is connected between outfan and the inverting input of described amplifier of described current/charge-voltage convertor 300.The voltage signal of described operational amplification circuit 200 output becomes current signal after described current/charge-voltage convertor 300 is changed, in-phase input end by the operational amplifier U1 in described positive feedback linearity circuit 400 input to described signal amplification circuit 200, in order to correct the nonlinearity erron of temperature sensor self, improve current/charge-voltage convertor 300 and export the linearity of electric current, the most described current signal is also by the inverting input of the operational amplifier U1 in described Current Negative Three-Point Capacitance correcting circuit 500 input to described signal amplification circuit 200, in order to stablize the current signal of described current/charge-voltage convertor 300 output.
nullSee Fig. 3，Described temperature sensing circuit disclosed in the above embodiments of the present application，Encourage by utilizing described reference voltage-stabilizing circuit 600 to produce signal sample circuit 100 described in a road constant pressure source，Use described signal sample circuit 100 that the temperature signal that described temperature sensor exports is converted into signal of telecommunication output voltage signal after described signal amplification circuit 200 amplifies，Described voltage signal becomes current signal after described current/charge-voltage convertor 300 is changed，In-phase input end by the operational amplifier U1 in described positive feedback linearity circuit 400 input to described signal amplification circuit 200，In order to correct the nonlinearity erron of temperature sensor self，The most described current signal is also by the inverting input of the operational amplifier U1 in described Current Negative Three-Point Capacitance correcting circuit 500 input to described signal amplification circuit 200，In order to stablize the current signal of described current/charge-voltage convertor 300 output，By the resistance value regulating described adjustable resistance branch road 700, described temperature sensing circuit is carried out zero point regulation，To prevent because of the individuation difference of each device in circuit，Cause the phenomenon exporting current deviation，Total output current signal is exported eventually through the negative power end of operational amplifier U1 in described signal amplification circuit 200.Therefore, foregoing circuit disclosed in the embodiment of the present application has the measurement result of degree of precision.
Concrete, see Fig. 3, described signal sample circuit 100 constitutes bridge circuit after being connected with temperature sensor, described bridge circuit comprises the first brachium pontis and the second brachium pontis, described first brachium pontis includes the first resistance R1 of series connection and described temperature sensor, one end that described temperature sensor is connected with described first resistance R1 is as the first sampled output of described signal sample circuit 100, the other end of described temperature sensor is connected with the outfan of described temperature sensing circuit, described second brachium pontis includes the second resistance R2 and the 3rd resistance R3 of series connection, the common port of described second resistance R2 and the 3rd resistance R3 is as the second sampled output of described signal sample circuit 100.
It is understood that in order to get sampled signal accurately, the first electric capacity C1 can also be used in described signal sample circuit 100 to be filtered, concrete described first electric capacity C1 is in parallel with described 3rd resistance R3.
Seeing Fig. 3, also include a potentiometer W1, described first potentiometer W1 and be connected between described first resistance R1 and the second resistance R2 by fixed contact in above-mentioned bridge circuit, the mobile contact of described first potentiometer W1 accesses described reference voltage.Concrete, the mobile contact of described potentiometer W1 is connected with the voltage output end of described reference voltage-stabilizing circuit 600, provides reference voltage for described bridge circuit.
See Fig. 3, described signal amplification circuit 200 comprises amplifier U1 and peripheral circuit thereof, the in-phase input end of described amplifier U1 is connected with the first sampled output of described sample circuit 100, the inverting input of described amplifier U1 is connected with the second sampled output of described sample circuit 100, the negative power end of described amplifier U1 is connected with the outfan of described temperature sensing circuit, and the outfan of described amplifier U1 is as the outfan of described signal amplification circuit 200.The negative power end of described operational amplifier U1 is connected by an an electric capacity C4 and positive voltage source VCC1.Further, described operational amplifier U1 also can use described reference voltage-stabilizing circuit 600 to power, i.e. the positive supply outfan of described operational amplifier U1 is connected with the voltage output end of described reference voltage-stabilizing circuit 600.
Described current/charge-voltage convertor 300 comprises at least one NPN type triode, wherein, the base stage of described audion is as the input of described current/charge-voltage convertor 300, and be connected with the outfan of described signal amplification circuit 200, the emitter stage of described audion is as the outfan of described current/charge-voltage convertor 300.nullSee Fig. 3，In technical scheme disclosed in the embodiment of the present application，Described current/charge-voltage convertor 300 can use connection level、Model is the first audion Q1 and the second audion Q2 composition of NPN type，The colelctor electrode of described first audion Q1 and the second audion Q2 can be connected to voltage source VCC1 by R0，The base stage of described first audion Q1 is connected to the outfan of described signal amplification circuit 200、Emitter stage is connected to the base stage of described second audion Q2，Although described first audion Q1 and the second audion Q2 functions as an audion，But it can increase the amplification of current signal，The emitter stage of described second audion Q2 accesses described adjustable resistance branch road 700，By regulation adjustable resistance branch road 700，Make it to match suitable resistance value，To meet total output current value in the range of 4-20mA.The parameter of correcting circuit device can be carried out, it is to avoid output bias by regulating the resistance value of adjustable resistance branch road 700 simultaneously.
Concrete, in the above embodiments of the present application, described current/charge-voltage convertor, including: model is the first audion Q1 and the second audion Q2 of positive-negative-positive, wherein:
The base stage of described first audion Q1 is connected with the outfan of described signal amplification circuit 200 as the input of described current/charge-voltage convertor 300, the base stage of described first audion Q1；
The second triode Q2 that the colelctor electrode of described second audion Q2 is connected with the colelctor electrode of described first audion Q1, base stage is connected with the emitter stage of described first audion Q1, the colelctor electrode of described second audion Q2 is used for an external positive voltage source VCC1, and the emitter stage of described second audion Q2 is as the outfan of described current/charge-voltage convertor 300.
See Fig. 3, can include the 9th resistance R9 in positive feedback linearity circuit described in technical scheme 400 disclosed in the above embodiments of the present application, one end of described 9th resistance R9 is connected with the outfan of described current/charge-voltage convertor 300, the other end is connected with the first sampled output of described signal sample circuit 100.Utilize the 9th resistance R9 that the outfan of described current/charge-voltage convertor 300 is connected to the first sampled output of described signal sample circuit 100, by suitably adjusting the resistance of described 9th resistance R9, the nonlinearity erron that temperature sensor described in adjustable self is brought into, improves the linearity of output electric current.
See Fig. 3, in technical scheme disclosed in the above embodiments of the present application, described Current Negative Three-Point Capacitance correcting circuit can include the 4th resistance R4, and one end of described 4th resistance R4 is connected with the outfan of described current/charge-voltage convertor 300, the other end is connected with the second sampled output of described signal sample circuit 100.Described 4th resistance R4 is utilized the outfan of described current/charge-voltage convertor 300 to be connected to the second sampled output of described signal sample circuit 100, to prevent output current fluctuation.
It is understandable that, reference voltage-stabilizing circuit 600 described in the above embodiments of the present application can be any one mu balanced circuit that can export constant voltage in prior art, in order to provide the voltage signal of high-quality, seeing Fig. 3, disclosed in the above embodiments of the present application, described reference voltage-stabilizing circuit 600 may include that
The reference voltage chip U2, described U2 that input is connected with input power is specifically as follows LM317 chip, and the voltage-regulation end of described reference voltage chip U2 is connected to the outfan of described temperature sensing circuit by the 6th resistance R6.Can also being connected between the voltage output end of described reference voltage chip and voltage-regulation end and have the 5th resistance R5, by R5, R6 being arranged rational resistance value ratio, the output voltage of anticipation can be obtained.
It is understood that the output electric current of described reference voltage chip U2 also can filtered export afterwards, therefore, seeing Fig. 3, disclosed in the above embodiments of the present application, described reference voltage-stabilizing circuit 600 can also include:
The second electric capacity C2 that one end is connected with the voltage output end of described reference voltage chip U2, the other end is connected with the outfan of described temperature sensing circuit.
It is understood that the described adjustable resistance branch road 700 disclosed in the above embodiments of the present application can be the resistance branch including adjustable resistance, seeing Fig. 3, it specifically may include that
It is series at the 7th resistance R7 between the outfan of described current/charge-voltage convertor 300 and described temperature sensing circuit outfan and the 8th resistance R8, described 7th resistance R7 and the 8th resistance R8 to be in series；
With described 7th second potentiometer W2 in parallel for resistance R7, the mobile contact of described second potentiometer W2 is connected with the either end of described 7th resistance R7.
nullIt is understandable that，In order to prevent the electric current backflow of described temperature sensing circuit outfan，In said temperature testing circuit，Diode D1 is accessed at described temperature sensing circuit outfan，Total current is exported by diode D1，It is understandable that，Described total output current signal can be by electric current i1 in Fig. 3、Electric current i2、Electric current i3 and electric current i4 composition，The value of wherein said electric current i1 and i4 is the least，Its fluctuation is negligible on the impact of total output electric current，The value of described electric current i3 is steady state value，Controlling described total output electric current in the circuit is exactly the value controlling electric current i2，The value of described electric current i2 is relevant to the resistance of described adjustable resistor branch road again，Therefore by regulating the resistance value size of described adjustable resistor branch road，Achieve that the control to described total output current signal，Preferably，In technical scheme disclosed in the embodiment of the present application，The size of described total output current signal is within the scope of 4-20mA.
Of course for obtaining the output signal of more high-quality, in said temperature testing circuit, it is also possible to include one with described 3rd electric capacity C3 in parallel for diode D1, by the 3rd electric capacity C3, output electric current is filtered.
Additionally, see Fig. 1, in technical scheme disclosed in the above embodiments of the present application, it is also possible to the current signal in described positive feedback linearity circuit 400 is filtered, see Fig. 3, said temperature testing circuit, it is also possible to including:
The 5th electric capacity C5 that one end is connected with described temperature sensing circuit outfan, the other end is connected with described first sampled output.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and between each embodiment, identical similar portion sees mutually
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses this utility model.Multiple amendment to these embodiments will be apparent from for those skilled in the art, and generic principles defined herein can realize in the case of without departing from spirit or scope of the present utility model in other embodiments.Therefore, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a temperature sensing circuit, it is characterised in that including:
Signal sample circuit, the input jointing temp sensor of described signal sample circuit, for the resistance signal of temperature sensor is converted into initial voltage signal, and described initial voltage signal is exported from the outfan of described signal sample circuit, the input of described signal sample circuit is the input of described temperature sensing circuit；
Signal amplification circuit, the input of described signal amplification circuit is connected with the outfan of described signal sample circuit, and for described initial voltage signal being amplified, and the voltage signal that amplifies after amplifying exports from the outfan of described signal amplification circuit；
Current/charge-voltage convertor, the input of described current/charge-voltage convertor is connected with the outfan of described signal amplification circuit, for described amplification voltage signal is converted into current signal, and described current signal is exported from the outfan of described current/charge-voltage convertor, the outfan of described temperature sensing circuit is drawn from the outfan of described current/charge-voltage convertor.
Temperature sensing circuit the most according to claim 1, it is characterized in that, described temperature sensing circuit also includes an adjustable resistance branch road, and described adjustable resistance branch road is connected between the outfan of described current/charge-voltage convertor and the outfan of described temperature sensing circuit.
Temperature sensing circuit the most according to claim 1, it is characterised in that described temperature sensing circuit also includes a reference voltage-stabilizing circuit, the voltage output end of described reference voltage-stabilizing circuit provides burning voltage for described temperature sensing circuit.
Temperature sensing circuit the most according to claim 3, it is characterised in that described reference voltage-stabilizing circuit includes a reference voltage chip, the voltage-regulation end of described reference voltage chip is connected to the outfan of described temperature sensing circuit by the 6th resistance.
Temperature sensing circuit the most according to claim 4, it is characterized in that, described signal sample circuit constitutes bridge circuit after being connected with temperature sensor, described bridge circuit comprises the first brachium pontis and the second brachium pontis, described first brachium pontis includes the first resistance of series connection and described temperature sensor, one end that described temperature sensor is connected with described first resistance is as the first sampled output of described signal sample circuit, the other end of described temperature sensor is connected with the outfan of described temperature sensing circuit, described second brachium pontis includes the second resistance and the 3rd resistance of series connection, the common port of described second resistance and the 3rd resistance is as the second sampled output of described signal sample circuit.
Temperature sensing circuit the most according to claim 5, it is characterised in that described bridge circuit also includes a potentiometer, the voltage output end of described reference voltage-stabilizing circuit is connected with the mobile contact of described potentiometer, provides reference voltage for described bridge circuit.
Temperature sensing circuit the most according to claim 5, it is characterized in that, described signal amplification circuit comprises an amplifier, the in-phase input end of described amplifier is connected with described first sampled output, the inverting input of described amplifier is connected with described second sampled output, the negative power end of described amplifier is connected with the outfan of described temperature sensing circuit, and the outfan of described amplifier is as the outfan of described signal amplification circuit.
Temperature sensing circuit the most according to claim 7, it is characterized in that, described temperature sensing circuit also includes a positive feedback linearity circuit, and described positive feedback linearity circuit is connected between the outfan of described current/charge-voltage convertor and the in-phase input end of described amplifier.
Temperature sensing circuit the most according to claim 7, it is characterized in that, described temperature sensing circuit also includes a Current Negative Three-Point Capacitance correcting circuit, and described Current Negative Three-Point Capacitance correcting circuit is connected between the outfan of described current/charge-voltage convertor and the inverting input of described amplifier.
10. according to the temperature sensing circuit described in claim 1 to 9 any one claim, it is characterized in that, described current/charge-voltage convertor comprises at least one NPN type triode, wherein, the base stage of described audion is as the input of described current/charge-voltage convertor, and be connected with the outfan of described signal amplification circuit, the emitter stage of described audion is as the outfan of described current/charge-voltage convertor.
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| CN201620125098.8U CN205719319U (en) | 2016-02-17 | 2016-02-17 | A kind of temperature sensing circuit |
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| CN201620125098.8U CN205719319U (en) | 2016-02-17 | 2016-02-17 | A kind of temperature sensing circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342158A (en) * | 2017-06-19 | 2017-11-10 | 朱立仁 | Transformer and its automatic protecting method |
| CN108334048A (en) * | 2018-05-07 | 2018-07-27 | 珠海格力电器股份有限公司 | Data acquisition system |
| CN109974878A (en) * | 2017-12-28 | 2019-07-05 | 新唐科技股份有限公司 | Temperature sensing circuit |
| CN111751018A (en) * | 2020-07-30 | 2020-10-09 | 深圳远致富海智能产业有限公司 | PCBA temperature function detection circuit |
-
2016
- 2016-02-17 CN CN201620125098.8U patent/CN205719319U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342158A (en) * | 2017-06-19 | 2017-11-10 | 朱立仁 | Transformer and its automatic protecting method |
| CN109974878A (en) * | 2017-12-28 | 2019-07-05 | 新唐科技股份有限公司 | Temperature sensing circuit |
| CN108334048A (en) * | 2018-05-07 | 2018-07-27 | 珠海格力电器股份有限公司 | Data acquisition system |
| CN111751018A (en) * | 2020-07-30 | 2020-10-09 | 深圳远致富海智能产业有限公司 | PCBA temperature function detection circuit |
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