CN204883430U - Appearance circuit is observed and controled to digital temperature - Google Patents
Appearance circuit is observed and controled to digital temperature Download PDFInfo
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- CN204883430U CN204883430U CN201520568511.3U CN201520568511U CN204883430U CN 204883430 U CN204883430 U CN 204883430U CN 201520568511 U CN201520568511 U CN 201520568511U CN 204883430 U CN204883430 U CN 204883430U
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Abstract
The utility model relates to a temperature field of observing and controling, an appearance circuit is observed and controled to digital temperature, including temperature measurement circuit, temperature control circuit, temperature treatment circuit and the LED display screen that connects gradually to and the temperature -control circuit of connection between temperature measurement circuit and temperature control circuit. This patent not only low price but also precision is higher.
Description
Technical field
The utility model relates to measurement and control of temperature field, is specifically related to a kind of digital temperature measurement and control instrument circuit.
Background technology
In daily productive life, increasing place needs to carry out measurement and control of temperature.But current temperature measurement-control instrument becomes polarization.The precision of the temperature measurement-control instrument that price comparison is cheap is lower, and the higher temperature measurement-control instrument of precision is expensive.A kind of moderate cost of present urgent need and the higher temperature measurement-control instrument of precision, the utility model is applicable to the measurement and control of temperature instrument circuit of this temperature measurement-control instrument just.
Utility model content
The utility model provides a kind of digital temperature measurement and control instrument circuit, to solve the lower or price problem costly of existing measurement and control instrument precision.
For overcoming the above problems, adopt following scheme:
Scheme one: a kind of digital temperature measurement and control instrument circuit, comprises the temperature sensing circuit, temperature setting circuit, Temperature Treatment circuit and the LED display that connect successively, and is connected to the temperature-control circuit between temperature sensing circuit and temperature setting circuit; The operational amplifier IC2 that described temperature sensing circuit comprises operational amplifier IC1 and is connected with operational amplifier IC1; The negative feedback of operational amplifier IC1 is parallel with thermistor R1 and electric capacity C1; The inverting input of operational amplifier IC1 connects the output terminal of described temperature setting circuit through resistance R2; The in-phase input end of operational amplifier IC1 connects adjustable resistance RP1 and resistance R5, contact resistance R4 between adjustable resistance RP1 and the output terminal of temperature setting circuit; The output terminal of operational amplifier IC1 is through the inverting input of resistance R3 concatenation operation amplifier IC2, and the in-phase input end of operational amplifier IC2 is through resistance R6 contact resistance R5; Serial adjustable resistance RP2 in the negative feedback of operational amplifier IC2; The output terminal of operational amplifier IC2 connects measuring junction.
Principle of work: temperature sensing circuit detects temperature signal and temperature signal is converted to electric signal and is delivered in temperature setting circuit, through temperature setting circuit directly through buffering after signal transmission to Temperature Treatment circuit, after Temperature Treatment processing of circuit signal, temperature value is shown in LED display.Regulate temperature-control circuit, the scope of the utility model telemetry circuit can be set.
Beneficial effect: 1. temperature sensing circuit, temperature setting circuit, Temperature Treatment circuit are connected successively with LED display, temperature-control circuit is connected between temperature sensing circuit and temperature setting circuit, the utility model structure used is simple, and components and parts used are less, and therefore cost reduces.2. the operational amplifier IC2 that temperature sensing circuit described in comprises operational amplifier IC1 and is connected with operational amplifier IC1; The negative feedback of operational amplifier IC1 is parallel with thermistor R1 and electric capacity C1; The inverting input of operational amplifier IC1 connects the output terminal of described temperature setting circuit through resistance R2; The in-phase input end of operational amplifier IC1 connects adjustable resistance RP1 and resistance R5, contact resistance R4 between adjustable resistance RP1 and the output terminal of temperature setting circuit; The output terminal of operational amplifier IC1 is through the inverting input of resistance R3 concatenation operation amplifier IC2, and the in-phase input end of operational amplifier IC2 is through resistance R6 contact resistance R5; Serial adjustable resistance RP2 in the negative feedback of operational amplifier IC2; The output terminal of operational amplifier IC2 connects measuring junction; Conveniently temperature detected in time and temperature signal be delivered to circuit below.
Scheme two: on the basis of scheme one further, temperature setting circuit comprises setting end and holds with setting the adjustable resistance RP3 be connected; The series arm shunt regulator diode D1 that adjustable resistance RP3 and resistance R8 forms; The output terminal of contact resistance R7 and temperature setting circuit while of the anode A of voltage stabilizing diode D1 and reference level R; Resistance R7 connects the positive voltage terminal that power pack provides; The value range of convenient setting observing and controlling temperature.
Scheme three: on the basis of scheme one further, temperature-control circuit comprises operational amplifier IC3, the in-phase input end of operational amplifier IC3 connects setting end, the anti-phase input termination measuring junction of operational amplifier IC3, the output terminal of operational amplifier IC3 connects the base stage of NPN type triode Q1 through resistance R9; Diode D2 is connected between the emitter of NPN type triode Q1 and base stage, and the emitter of NPN type triode Q1 connects the negative voltage side provided by power pack; The collector of NPN type triode connects the anode of diode D3 and one end of relay K, and the negative electrode of diode D3 is all connected with the other end of relay K the positive voltage terminal provided by power pack; Conveniently in set model and TT & C, carry out selection operation.
Scheme four: on the basis of scheme one further, Temperature Treatment circuit comprises analog to digital converter ICL7107CPL, the V+ end of analog to digital converter ICL7107CPL connects the positive voltage terminal provided by power pack, the OSC1 of ICL7107CPL holds one end of contact resistance R13 and one end of electric capacity C4, the other end of resistance R13 connects the OSC2 end of ICL7107CPL, and the other end of electric capacity C4 connects the OSC3 end of ICL7107CPL; The AZ end of ICL7107CPL connects one end of electric capacity C5, one end of other end contact resistance R14 of electric capacity C5 and one end of electric capacity C6, and the other end of resistance R14 connects the BUF end of ICL7107CPL, and the other end of electric capacity C6 connects the INT end of ICL7107CPL; The IN+ of ICL7107CPL holds one end of contact resistance R10 and one end of electric capacity C1, the other end ground connection of electric capacity C1; The IN-end of ICL7107CPL and COM hold ground connection; The other end of resistance R10 connects the movable end of single-pole double-throw switch (SPDT) SA, and two stiff ends of switch S A are respectively setting end and measuring junction; One end of this end of resistance R10 contact resistance R11 simultaneously, the other end of resistance R11 connects one end of adjustable resistance RP4, the adjustable end of adjustable resistance RP4 connects the REFLO end of ICL7107CPL, one end of the other end contact resistance R12 of adjustable resistance RP4, the other end ground connection of resistance R12; The GND of ICL7107CPL holds ground connection; The V-of ICL7107CPL holds the one end connecting electric capacity C2 and the negative voltage side provided by power pack, the other end ground connection of electric capacity C2; The CR-of ICL7107CPL connects one end of electric capacity C3, and the other end of electric capacity C3 connects the CR+ end of ICL7107CPL.Use analog to digital converter ICL7107CPL not only low price but also utilize ICL7107CPL to compensate thermistor raises sensitivity decrease shortcoming with temperature, effectively improve the precision of integrated circuit.Make the function had in Temperature Treatment circuit for gamma correction, be conducive to the precision improving digital temperature measurement and control instrument circuit.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the temperature sensing circuit of the utility model embodiment;
Fig. 2 is the circuit diagram of the temperature setting circuit of the utility model embodiment;
Fig. 3 is the circuit diagram of the temperature-control circuit of the utility model embodiment;
Fig. 4 is the circuit diagram of the Temperature Treatment circuit of the utility model embodiment.
Embodiment
Below by embodiment, the utility model is described in further detail:
Reference numeral in Figure of description comprises: thermistor R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, adjustable resistance RP1, adjustable resistance RP2, adjustable resistance RP3, adjustable resistance RP4, switch S A, operational amplifier IC1, operational amplifier IC2, operational amplifier IC3, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, voltage stabilizing diode D1, diode D2, diode D3, triode Q1, reference level R, anode A, negative electrode K, relay K.
A kind of digital temperature measurement and control instrument circuit, comprises the temperature sensing circuit, temperature setting circuit, Temperature Treatment circuit and the LED display that connect successively, and is connected to the temperature-control circuit between temperature sensing circuit and temperature setting circuit.
As shown in Figure 1, one end of the resistance R2 of temperature sensing circuit connects the output terminal of temperature setting circuit and one end of resistance R4, the inverting input of the other end concatenation operation amplifier IC1 of resistance R2, one end of electric capacity C1 and one end of thermistor R1.The other end of resistance R4 connects one end of adjustable resistance RP1, one end of the other end contact resistance R5 of adjustable resistance RP1, the other end ground connection of resistance R5.The in-phase input end of the adjustable end concatenation operation amplifier IC1 of adjustable resistance RP1.The other end of thermistor R1 and the output terminal of the other end equal concatenation operation amplifier IC1 of electric capacity C1 and one end of resistance R3, the inverting input of other end concatenation operation amplifier IC2 of resistance R3 and one end of adjustable resistance RP2.The other end of adjustable resistance RP2 is connected with the output terminal of operational amplifier IC2 with the adjustable end of adjustable resistance RP2.One end of the in-phase input end contact resistance R6 of operational amplifier IC2, the other end ground connection of resistance R6.The output terminal of operational amplifier IC2 connects measuring junction.
Thermistor R1 adopts calibration to be the platinum resistance of Pt100, and operational amplifier IC1 and operational amplifier IC2 adopts LM308.Thermistor R1 adopts three-wire system connection, can reduce the additive error that thermistor R1 varies with temperature generation like this.Thermistor R1 is connected in the negative feedback loop of operational amplifier IC1, when thermistor R1 varies with temperature, the gain of operational amplifier IC1 changes thereupon, thus converts the temperature signal that thermistor R1 experiences to voltage signal and be passed to operational amplifier IC2.Measuring junction is transferred to after signal oppositely being amplified by operational amplifier IC2.
As shown in Figure 2, one end of the resistance R7 of temperature setting circuit connects the voltage+6V that power pack provides, one end of other end contact resistance R8 of resistance R7, the anode A of voltage stabilizing diode D1 and reference level R, this end of resistance R7 is the output terminal of temperature setting circuit simultaneously.The negative electrode K ground connection of voltage stabilizing diode D1.The other end of resistance R8 connects one end of adjustable resistance RP3, the other end ground connection of adjustable resistance RP3.The adjustable termination setting end of adjustable resistance RP3.
Voltage stabilizing diode D1 adopts TL431.
As shown in Figure 3, the in-phase input end of the operational amplifier IC3 in temperature-control circuit connects setting end, the anti-phase input termination measuring junction of operational amplifier IC3, one end of the output terminal contact resistance R9 of operational amplifier IC3.The other end of resistance R9 connects the negative electrode of diode D2 and the base stage of NPN type triode Q1.The negative electrode of diode D2 and the emitter of NPN type triode Q1 are all connected the negative voltage-6V provided by power pack.The collector of NPN type triode connects the anode of diode D3 and one end of relay K, and the negative electrode of diode D3 and the other end of relay K are all connected the positive voltage+6V provided by power pack.
The output voltage of the voltage that temperature sensing circuit exports by temperature-control circuit and initialization circuit compares, and comparative result determines the state of relay K, realizes temperature value to control in setting value.
Operational amplifier IC3 adopts LM308, and diode D2 and diode D3 adopts IN4148.
As shown in Figure 4, the V+ end of the analog to digital converter ICL7107CPL in Temperature Treatment circuit connects the+6V voltage provided by power pack, the OSC1 of ICL7107CPL holds one end of contact resistance R13 and one end of electric capacity C4, the other end of resistance R13 connects the OSC2 end of ICL7107CPL, and the other end of electric capacity C4 connects the OSC3 end of ICL7107CPL.The AZ end of ICL7107CPL connects one end of electric capacity C5, one end of other end contact resistance R14 of electric capacity C5 and one end of electric capacity C6, and the other end of resistance R14 connects the BUF end of ICL7107CPL, and the other end of electric capacity C6 connects the INT end of ICL7107CPL.
The IN+ of ICL7107CPL holds one end of contact resistance R10 and one end of electric capacity C1, the other end ground connection of electric capacity C1.The IN-end of ICL7107CPL and COM hold ground connection.The other end of resistance R10 connects the movable end of single-pole double-throw switch (SPDT) SA, and two stiff ends of switch S A are respectively setting end and measuring junction.One end of this end of resistance R10 contact resistance R11 simultaneously, the other end of resistance R11 connects one end of adjustable resistance RP4, the adjustable end of adjustable resistance RP4 connects the REFLO end of ICL7107CPL, one end of the other end contact resistance R12 of adjustable resistance RP4, the other end ground connection of resistance R12.
The GND of ICL7107CPL holds ground connection.The V-of ICL7107CPL holds the one end connecting electric capacity C2 and the-6V voltage provided by power pack, the other end ground connection of electric capacity C2.The CR-of ICL7107CPL connects one end of electric capacity C3, and the other end of electric capacity C3 connects the CR+ end of ICL7107CPL.
Because thermistor R1 adopts platinum resistance, its nonlinear characteristic makes the temperature control of platinum resistance rise with temperature and reduce, but the high-precision linear compensation that utilized the conversion characteristic of analog to digital converter to carry out in the utility model.Wherein, the current potential of the reference input voltage negative terminal (REFLO end) of analog to digital converter ICL7107CPL changes along with the change of input signal.When dut temperature is lower, the current potential of REFLO end is lower, and because REFHI terminal potential is fixed, reference voltage is higher, and the sensitivity of analog to digital converter ICL7107CPL is lower.When dut temperature is higher, REFLO holds the current potential obtained after dividing potential drop higher, and make the reference voltage of analog to digital converter ICL7107CPL less, then analog to digital converter ICL7107CPL sensitivity is higher.Because the conversion characteristic of analog to digital converter ICL7107CPL is just contrary with the temperature control relation of platinum resistance, therefore, it is possible to make the nonlinearity erron of measurement and control of temperature instrument circuit very little by gamma correction mode.
As shown in Figure 1 and Figure 4, the REFHI end of ICL7107CPL is of coupled connections between adjustable resistance RP1 and resistance R5.
When switch is placed in setting end, regulate adjustable resistance RP3 can set observing and controlling temperature value, now LED display displayed value is the temperature value of setting.After having set, switch S A is placed in measuring junction.
The signal that temperature sensing circuit is delivered to measuring junction is passed to the analog input end of the analog to digital converter ICL7107CPL of Temperature Treatment circuit through switch S A, carry out analog to digital conversion.Also can special delivery show to the enterprising trip temperature of LED display be connected with analog to digital converter ICL7107CPL after analog to digital conversion through signal.
The content that the port of components and parts used herein specifies according to its databook uses.
Above-described is only embodiment of the present utility model, and in scheme, the general knowledge such as known concrete structure and characteristic does not do too much description at this.Should be understood that; for a person skilled in the art, under the prerequisite not departing from the utility model structure, some distortion and improvement can also be made; these also should be considered as protection domain of the present utility model, and these all can not affect effect and the practical applicability of the utility model enforcement.
Claims (4)
1. a digital temperature measurement and control instrument circuit, it is characterized in that: comprise the temperature sensing circuit, temperature setting circuit, Temperature Treatment circuit and the LED display that connect successively, and be connected to the temperature-control circuit between temperature sensing circuit and temperature setting circuit; The operational amplifier IC2 that described temperature sensing circuit comprises operational amplifier IC1 and is connected with operational amplifier IC1; The negative feedback of operational amplifier IC1 is parallel with thermistor R1 and electric capacity C1; The inverting input of operational amplifier IC1 connects the output terminal of described temperature setting circuit through resistance R2; The in-phase input end of operational amplifier IC1 connects adjustable resistance RP1 and resistance R5, contact resistance R4 between adjustable resistance RP1 and the output terminal of temperature setting circuit; The output terminal of operational amplifier IC1 is through the inverting input of resistance R3 concatenation operation amplifier IC2, and the in-phase input end of operational amplifier IC2 is through resistance R6 contact resistance R5; Serial adjustable resistance RP2 in the negative feedback of operational amplifier IC2; The output terminal of operational amplifier IC2 connects measuring junction.
2. digital temperature measurement and control instrument circuit according to claim 1, is characterized in that: temperature setting circuit comprises setting end and holds with setting the adjustable resistance RP3 be connected; The series arm shunt regulator diode D1 that adjustable resistance RP3 and resistance R8 forms; The output terminal of contact resistance R7 and temperature setting circuit while of the anode A of voltage stabilizing diode D1 and reference level R; Resistance R7 connects the positive voltage terminal that power pack provides.
3. digital temperature measurement and control instrument circuit according to claim 1, it is characterized in that: temperature-control circuit comprises operational amplifier IC3, the in-phase input end of operational amplifier IC3 connects setting end, the anti-phase input termination measuring junction of operational amplifier IC3, the output terminal of operational amplifier IC3 connects the base stage of NPN type triode Q1 through resistance R9; Diode D2 is connected between the emitter of NPN type triode Q1 and base stage, and the emitter of NPN type triode Q1 connects the negative voltage side provided by power pack; The collector of NPN type triode connects the anode of diode D3 and one end of relay K, and the negative electrode of diode D3 is all connected with the other end of relay K the positive voltage terminal provided by power pack.
4. digital temperature measurement and control instrument circuit according to claim 1, it is characterized in that: Temperature Treatment circuit comprises analog to digital converter ICL7107CPL, the V+ end of analog to digital converter ICL7107CPL connects the positive voltage terminal provided by power pack, the OSC1 of ICL7107CPL holds one end of contact resistance R13 and one end of electric capacity C4, the other end of resistance R13 connects the OSC2 end of ICL7107CPL, and the other end of electric capacity C4 connects the OSC3 end of ICL7107CPL; The AZ end of ICL7107CPL connects one end of electric capacity C5, one end of other end contact resistance R14 of electric capacity C5 and one end of electric capacity C6, and the other end of resistance R14 connects the BUF end of ICL7107CPL, and the other end of electric capacity C6 connects the INT end of ICL7107CPL; The IN+ of ICL7107CPL holds one end of contact resistance R10 and one end of electric capacity C1, the other end ground connection of electric capacity C1; The IN-end of ICL7107CPL and COM hold ground connection; The other end of resistance R10 connects the movable end of single-pole double-throw switch (SPDT) SA, and two stiff ends of switch S A are respectively setting end and measuring junction; One end of this end of resistance R10 contact resistance R11 simultaneously, the other end of resistance R11 connects one end of adjustable resistance RP4, the adjustable end of adjustable resistance RP4 connects the REFLO end of ICL7107CPL, one end of the other end contact resistance R12 of adjustable resistance RP4, the other end ground connection of resistance R12; The GND of ICL7107CPL holds ground connection; The V-of ICL7107CPL holds the one end connecting electric capacity C2 and the negative voltage side provided by power pack, the other end ground connection of electric capacity C2; The CR-of ICL7107CPL connects one end of electric capacity C3, and the other end of electric capacity C3 connects the CR+ end of ICL7107CPL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520568511.3U CN204883430U (en) | 2015-07-31 | 2015-07-31 | Appearance circuit is observed and controled to digital temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520568511.3U CN204883430U (en) | 2015-07-31 | 2015-07-31 | Appearance circuit is observed and controled to digital temperature |
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| CN204883430U true CN204883430U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520568511.3U Expired - Fee Related CN204883430U (en) | 2015-07-31 | 2015-07-31 | Appearance circuit is observed and controled to digital temperature |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005337A (en) * | 2015-07-31 | 2015-10-28 | 重庆市志益鑫电子科技有限公司 | Digital temperature measuring and controlling instrument circuit |
| CN105548586A (en) * | 2015-12-21 | 2016-05-04 | 成都尼奥尔电子科技有限公司 | A high-definition image display alcohol content tester based on a signal conditioning circuit |
| CN106385238A (en) * | 2016-08-31 | 2017-02-08 | 兰州空间技术物理研究所 | Ion current amplifying circuit for collecting electrode of vacuum ionization gauge |
-
2015
- 2015-07-31 CN CN201520568511.3U patent/CN204883430U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005337A (en) * | 2015-07-31 | 2015-10-28 | 重庆市志益鑫电子科技有限公司 | Digital temperature measuring and controlling instrument circuit |
| CN105005337B (en) * | 2015-07-31 | 2017-04-19 | 重庆市志益鑫电子科技有限公司 | Digital temperature measuring and controlling instrument circuit |
| CN105548586A (en) * | 2015-12-21 | 2016-05-04 | 成都尼奥尔电子科技有限公司 | A high-definition image display alcohol content tester based on a signal conditioning circuit |
| CN106385238A (en) * | 2016-08-31 | 2017-02-08 | 兰州空间技术物理研究所 | Ion current amplifying circuit for collecting electrode of vacuum ionization gauge |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20160731 |