CN204010459U - The excess Temperature warning circuit of integrated operational amplifier teaching use - Google Patents
The excess Temperature warning circuit of integrated operational amplifier teaching use Download PDFInfo
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- CN204010459U CN204010459U CN201420409664.9U CN201420409664U CN204010459U CN 204010459 U CN204010459 U CN 204010459U CN 201420409664 U CN201420409664 U CN 201420409664U CN 204010459 U CN204010459 U CN 204010459U
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Abstract
The utility model provides a kind of excess Temperature warning circuit of integrated operational amplifier teaching use, it is characterized in that: comprise square wave oscillation unit, temperature sensing unit, positive ratio amplifying unit, voltage comparison unit and LED driver element, wherein square wave oscillation unit, positive ratio amplifying unit and voltage comparison unit are all the element circuits of integrated operational amplifier; The output terminal of square wave oscillation unit is connected to the input end of LED driver element, the output terminal of temperature sensing unit is connected to the input end of positive ratio amplifying unit, the output terminal of positive ratio amplifying unit is connected to the input end of voltage comparison unit, and the output terminal of voltage comparison unit is connected to the control end of LED driver element.By the ocular demonstration of this functional circuit, make the confirmatory experiment of integrated operational amplifier separate unit circuit originally dry as dust become more lively, thereby improved student, participate in the interest of testing, strengthened the effect of experimental teaching.
Description
Technical field
The utility model relates to a kind of warning circuit, and especially a kind of excess Temperature warning circuit of integrated operational amplifier teaching use, belongs to electronic technology field.
Background technology
Integrated operational amplifier is device conventional in mimic channel, consisting of element circuit, if positive proportional amplifier, voltage comparator and square-wave oscillator are one of main contents of imitative electric tech teaching.In order to allow student understand better and grasp the element circuit of above-mentioned integrated operational amplifier, in teaching, conventionally can arrange the Experiment of Electrical Circuits of positive proportional amplifier, voltage comparator and square-wave oscillator.But because independently positive proportional amplifier experiment separately, voltage comparator experiment and square-wave oscillator experiment are all replication experiments, be difficult to attract student's interest, therefore, teaching efficiency is also bad.
Being published in < < laboratory study in July, 2012 thinks with < < electronic technical experiment teaching thinking > > mono-literary composition of exploring > > periodical, student is not interested to electronic technology replication experiment, cause experiment teaching effect bad, improve electronic technical experiment teaching effect, must design a little attractive experimental projects, with mobilizing students, participate in the interest of experiment.
Utility model content
The bad technical matters of separate unit circuit experiment teaching effect forming in order to solve above-mentioned traditional integrated operational amplifier, the utility model provides a kind of excess Temperature warning circuit of integrated operational amplifier teaching use, this circuit the is integrated element circuit of positive proportional amplifier, voltage comparator and square-wave oscillator, and the element circuit that adds temperature sensing and LED to drive, be applied to integrated operational amplifier experimental teaching, be intended to improve the interest that student participates in experiment, improve the effect of integrated operational amplifier experimental teaching.
Technical thought of the present utility model is: design a functional circuit being comprised of positive proportional amplifier, voltage comparator and square-wave oscillator, replace separately the independently element circuit of positive proportional amplifier, voltage comparator and square-wave oscillator, be applied to integrated operational amplifier experimental teaching, to improve student's learning interest, improve experiment teaching effect.
The concrete technical scheme that the utility model is taked is as follows:
A kind of excess Temperature warning circuit of integrated operational amplifier teaching use, it is characterized in that: comprise square wave oscillation unit, temperature sensing unit, positive ratio amplifying unit, voltage comparison unit and LED driver element, wherein square wave oscillation unit, positive ratio amplifying unit and voltage comparison unit are all the element circuits of integrated operational amplifier; The output terminal of square wave oscillation unit is connected to the input end of LED driver element, the output terminal of temperature sensing unit is connected to the input end of positive ratio amplifying unit, the output terminal of positive ratio amplifying unit is connected to the input end of voltage comparison unit, and the output terminal of voltage comparison unit is connected to the control end of LED driver element.
The functional circuit that the utility model is reported to the police by excess Temperature of design, inside has comprised the element circuit of the positive proportional amplifier, voltage comparator and the square-wave oscillator that are comprised of integrated operational amplifier of needs study, by the ocular demonstration of this functional circuit, make the confirmatory experiment of integrated operational amplifier separate unit circuit originally dry as dust become more lively, thereby improved student and participated in the interest of testing, strengthened the effect of experimental teaching, made students can have better understanding to integrated computation discharger and element circuit thereof.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1, the excess Temperature warning circuit of this integrated operational amplifier teaching use comprises square wave oscillation unit 10, temperature sensing unit 20, positive ratio amplifying unit 30, voltage comparison unit 40 and LED driver element 50.The output terminal of square wave oscillation unit 10 is all connected to the input end of LED driver element 50, the output terminal of temperature sensing unit 20 is connected to the input end of positive ratio amplifying unit 30, the output terminal of positive ratio amplifying unit 30 is connected to the input end of voltage comparison unit 40, and the output terminal of voltage comparison unit 40 is connected to the control end of LED driver element 50.
Specific implementation circuit diagram of the present utility model as shown in Figure 2, wherein: square wave oscillation unit 10 is by integrated operational amplifier U1, resistance R 1, resistance R 2, resistance R 3 and capacitor C 1 form, resistance R 1 one ends are connected to the normal phase input end of integrated operational amplifier U1 and one end of resistance R 2, the other end of resistance R 1 is connected to the output terminal of integrated operational amplifier U1, the other end ground connection of resistance R 2, one end of resistance R 3 is connected to the inverting input of integrated operational amplifier U1 and one end of capacitor C 1, the other end of resistance R 3 is connected to the output terminal of integrated operational amplifier U1, the other end ground connection of capacitor C 1, temperature sensing unit 20 is comprised of temperature sensor U2, resistance R 6 and resistance R 7, resistance R 6 is connected to respectively 1 pin of positive power source terminal and temperature sensor U2, the 3 pin ground connection of temperature sensor U2, and 2 pin are connected to resistance R 7, the other end ground connection of resistance R 7, the model of temperature sensor U2 is LM35, positive ratio amplifying unit 30 is comprised of integrated operational amplifier U3, resistance R 8 and resistance R 9, the normal phase input end of integrated operational amplifier U3 is connected to 2 pin of the temperature sensor U2 of temperature sensing unit 20, resistance R 8 one ends are connected to the inverting input of integrated operational amplifier U3 and one end of resistance R 9, the other end ground connection of resistance R 8, the other end of resistance R 9 is connected to the output terminal of integrated operational amplifier U3, voltage comparison unit 40 is comprised of integrated operational amplifier U4 and adjustable resistance RV1, the normal phase input end of integrated operational amplifier U4 is connected to the output terminal of the integrated operational amplifier U3 of positive ratio amplifying unit 30, the anti-phase input of integrated operational amplifier U4 is connected to the mobile terminal of adjustable resistance RV1, and the other two ends of adjustable resistance RV1 are connected to respectively positive power source terminal and ground, LED driver element 50 is by triode Q1, triode Q2, resistance R 4, resistance R 5, resistance R 10 and light emitting diode D1 form, the integrated computation that resistance R 4 one ends are connected to square wave oscillation unit 10 is put the output terminal of device U1, the other end is connected to the base stage of triode Q1, the integrated computation that resistance R 10 1 ends are connected to voltage comparison unit 40 is put the output terminal of device U4, the other end is connected to the base stage of triode Q2, resistance R 5 is connected to respectively the positive pole of positive power source terminal and light emitting diode D1, the negative pole of light emitting diode D1 is connected to the collector of triode Q1, the emitter of triode Q1 is connected to the collector of triode Q2, the grounded emitter of triode Q2.
The experimentation that application the utility model circuit carries out is as follows:
(1), square wave oscillation experiment: energising, by the voltage waveform of the output terminal of the integrated operational amplifier U1 of oscillograph observation square wave oscillation unit 10, cycle, maximum level and the minimum level of the record square-wave voltage of exporting.
(2), positive ratio amplification test: energising, input terminal voltage and the output end voltage of the integrated operational amplifier U3 of measuring voltage amplifying unit 30, calculate and recording voltage enlargement factor respectively.
(3), voltage comparative experiments: energising, the normal phase input end voltage of the integrated operational amplifier U4 of first measuring voltage comparing unit 40, again power voltage terminal is transferred to in the RV1 mobile terminal of voltage comparison unit 40, then monitor the inverting input of integrated operational amplifier U4 and the voltage of output terminal on one side, on one side slowly the mobile terminal of RV1 past hold adjusting, finally sum up the working law of voltage comparator circuit.
(4), excess Temperature is reported to the police and is tested: the temperature sensor U2 of temperature sensing unit 20 is close to a monitored object, and monitored object is heated to design temperature; Power voltage terminal is transferred to in the mobile terminal of the adjustable resistance RV1 of voltage comparison unit 40; Energising, slowly the mobile terminal of the adjustable resistance RV1 of voltage comparison unit 40 past hold adjusting, until observe the light emitting diode D1 of LED driver element 50, glimmer.
Claims (2)
1. the excess Temperature warning circuit of integrated operational amplifier teaching use, it is characterized in that: comprise square wave oscillation unit (10), temperature sensing unit (20), positive ratio amplifying unit (30), voltage comparison unit (40) and LED driver element (50), wherein square wave oscillation unit (10), positive ratio amplifying unit (30) and voltage comparison unit (40) are all the element circuits of integrated operational amplifier; The output terminal of square wave oscillation unit (10) is connected to the input end of LED driver element (50), the output terminal of temperature sensing unit (20) is connected to the input end of positive ratio amplifying unit (30), the output terminal of positive ratio amplifying unit (30) is connected to the input end of voltage comparison unit (40), and the output terminal of voltage comparison unit (40) is connected to the control end of LED driver element (50).
2. the excess Temperature warning circuit of integrated operational amplifier according to claim 1 teaching use, is characterized in that:
Described square wave oscillation unit (10) is comprised of integrated operational amplifier U1, resistance R 1, resistance R 2, resistance R 3 and capacitor C 1, resistance R 1 one ends are connected to the normal phase input end of integrated operational amplifier U1 and one end of resistance R 2, the other end of resistance R 1 is connected to the output terminal of integrated operational amplifier U1, the other end ground connection of resistance R 2, one end of resistance R 3 is connected to the inverting input of integrated operational amplifier U1 and one end of capacitor C 1, the other end of resistance R 3 is connected to the output terminal of integrated operational amplifier U1, the other end ground connection of capacitor C 1;
Described temperature sensing unit (20) is comprised of temperature sensor U2, resistance R 6 and resistance R 7, resistance R 6 is connected to respectively 1 pin of positive power source terminal and temperature sensor U2, the 3 pin ground connection of temperature sensor U2,2 pin are connected to resistance R 7, the other end ground connection of resistance R 7, the model of temperature sensor U2 is LM35;
Described positive ratio amplifying unit (30) is comprised of integrated operational amplifier U3, resistance R 8 and resistance R 9, the normal phase input end of integrated operational amplifier U3 is connected to 2 pin of the temperature sensor U2 of temperature sensing unit 20, resistance R 8 one ends are connected to the inverting input of integrated operational amplifier U3 and one end of resistance R 9, the other end ground connection of resistance R 8, the other end of resistance R 9 is connected to the output terminal of integrated operational amplifier U3;
Described voltage comparison unit (40) is comprised of integrated operational amplifier U4 and adjustable resistance RV1, the normal phase input end of integrated operational amplifier U4 is connected to the output terminal of the integrated operational amplifier U3 of positive ratio amplifying unit 30, the anti-phase input of integrated operational amplifier U4 is connected to the mobile terminal of adjustable resistance RV1, and the other two ends of adjustable resistance RV1 are connected to respectively positive power source terminal and ground;
Described LED driver element (50) is by triode Q1, triode Q2, resistance R 4, resistance R 5, resistance R 10 and light emitting diode D1 form, the integrated computation that resistance R 4 one ends are connected to square wave oscillation unit (10) is put the output terminal of device U1, the other end is connected to the base stage of triode Q1, the integrated computation that resistance R 10 1 ends are connected to voltage comparison unit (40) is put the output terminal of device U4, the other end is connected to the base stage of triode Q2, resistance R 5 is connected to respectively the positive pole of positive power source terminal and light emitting diode D1, the negative pole of light emitting diode D1 is connected to the collector of triode Q1, the emitter of triode Q1 is connected to the collector of triode Q2, the grounded emitter of triode Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409664.9U CN204010459U (en) | 2014-07-24 | 2014-07-24 | The excess Temperature warning circuit of integrated operational amplifier teaching use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409664.9U CN204010459U (en) | 2014-07-24 | 2014-07-24 | The excess Temperature warning circuit of integrated operational amplifier teaching use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204010459U true CN204010459U (en) | 2014-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420409664.9U Expired - Fee Related CN204010459U (en) | 2014-07-24 | 2014-07-24 | The excess Temperature warning circuit of integrated operational amplifier teaching use |
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| Country | Link |
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| CN (1) | CN204010459U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108399844A (en) * | 2018-04-28 | 2018-08-14 | 广西职业技术学院 | A kind of teaching demonstration device of temperature control LED light flicker frequency |
-
2014
- 2014-07-24 CN CN201420409664.9U patent/CN204010459U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108399844A (en) * | 2018-04-28 | 2018-08-14 | 广西职业技术学院 | A kind of teaching demonstration device of temperature control LED light flicker frequency |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20160724 |