CN204515010U - A kind of wide region signal acquisition circuit - Google Patents
A kind of wide region signal acquisition circuit Download PDFInfo
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- CN204515010U CN204515010U CN201520245849.5U CN201520245849U CN204515010U CN 204515010 U CN204515010 U CN 204515010U CN 201520245849 U CN201520245849 U CN 201520245849U CN 204515010 U CN204515010 U CN 204515010U
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Abstract
The utility model relates to a kind of wide region signal acquisition circuit and comprises DC power source unit, constant current source unit, input detection unit and reference power source dividing potential drop comparing unit; Input voltage signal enters comparer after dividing potential drop, the benchmark voltage exported by input detection unit and reference power source dividing potential drop comparing unit is made comparisons, thus driving optocoupler, output detections signal is to key control unit, and constant current source unit can carry out overcurrent protection to the voltage signal of input simultaneously; DC power source unit is used to provide power supply and reference voltage.The utility model can regulate the acquisition range of input voltage signal by adjusting reference voltage and divider resistance according to the different demands of system; acquisition range is large; and because the existence of constant current source unit, can play the effect of overcurrent protection to input signal, security is higher.
Description
Technical field
The utility model relates to signals collecting field, especially a kind of wide-range voltage signal acquisition circuit.
Background technology
Along with the application of electronic installation in industrial automation is more and more extensive, the accuracy requirement of system to signals collecting is more and more higher, more and more wider to the area requirement of signals collecting, when the accuracy of signals collecting does not reach system requirements, electronic installation may be caused normally to work.In order to solve the problem, people devise signal acquisition circuit, and conventional is opto-coupled feedback circuit at present, and input voltage signal drives optocoupler through divider resistance, opto-coupled feedback signal outputs to dsp chip, by judging that low and high level judges input voltage whether in setting range.This circuit design is simple, but the scope of interpretable input voltage signal is less, and does not carry out overcurrent protection design to input signal.
Utility model content
The purpose of this utility model be exactly for prior art exist deficiency and a kind of wide region signal acquisition circuit is provided; this circuit possesses input overcurrent protection function, and can be regulated the acquisition range of input voltage signal by change reference voltage and divider resistance according to system requirements.
Providing a kind of wide region signal acquisition circuit to overcome the above problems the utility model, it is characterized in that: comprise DC power source unit, constant current source unit, input detection unit and reference power source dividing potential drop comparing unit;
Input voltage signal enters comparer after dividing potential drop, the benchmark voltage exported by input detection unit and reference power source dividing potential drop comparing unit is made comparisons, thus driving optocoupler, output detections signal is to key control unit, and constant current source unit can carry out overcurrent protection to the voltage signal of input simultaneously; DC power source unit is used to provide power supply and reference voltage.
Described DC power source unit comprises divider resistance R1, R2, R3, power supply chip D5, filter resistance R9, and filter capacitor C3 is used to provide working power and reference voltage;
Constant current source unit comprises counnter attack diode D6, D7, current-limiting resistance R13, R17, R20, R21, amplifier U1A, triode Q1, filter capacitor C5, is used to provide small electric stream constant current source, carries out overcurrent protection to input signal;
Input detection unit comprises counnter attack diode D2, stabilivolt D4, divider resistance R7, R8, current-limiting resistance R10, R14, R18, comparer U2A, optocoupler U3, filter capacitor C2, is used for detecting input voltage signal;
Input power Vin+ is connected with 1 pin of filter resistance R9 and power supply chip D5 by divider resistance R1, divider resistance R2 is connected in parallel between 1 pin of power supply chip D5 and 2 pin, divider resistance R3 is connected in parallel between 2 pin of power supply chip D5 and 3 pin, 3 pin of power supply chip D5 are connected with VinGND, filter resistance R9 exports to survey and is connected with 3 pin of amplifier U1A, and the output that filter capacitor C3 is connected in parallel on filter resistance R9 is surveyed between VinGND;
Input voltage signal is connected with current-limiting resistance R20 by counnter attack diode D6, Vin+ is connected with current-limiting resistance R20 by counnter attack diode D7, current-limiting resistance R13, the other end of current-limiting resistance R20 is connected with 2 pin of triode Q1,1 pin of amplifier U1A is connected with 1 pin of triode Q1 by current-limiting resistance R17,2 pin of amplifier U1A are connected with 3 pin of triode Q1, and current-limiting resistance R21 and filter capacitor C5 is connected in parallel between 3 pin of triode Q1 and VinGND;
Input voltage signal is by counnter attack diode D2, be connected with 6 pin of comparer U2A by divider resistance R7 again, divider resistance R8, filter capacitor C2, stabilivolt D4 are connected in parallel between 6 pin of comparer U2A and VinGND, benchmark voltage is connected with 7 pin of comparer U2A by current-limiting resistance R10,1 pin of comparer U2A is connected with 2 pin of optocoupler U3,3 pin of Q2 are connected with 1 pin of optocoupler U3 by current-limiting resistance R14,3.3V power supply is connected with 4 pin of optocoupler U3 by current-limiting resistance R18,4 pin of optocoupler U3 are output signal, and 3 pin of optocoupler U3 meet GND;
Reference input voltage is by diode D1, divider resistance R4, R5 is connected with 5 pin of amplifier U1B, divider resistance R6, filter capacitor C1, stabilivolt D3 is connected in parallel between 5 pin of amplifier U1B and VinGND, 6 pin of amplifier U1B are connected with 7 pin, 7 pin of amplifier U1B are benchmark voltage, be connected with 4 pin of comparer U2B by current-limiting resistance R12 again, Vin+ is connected with 5 pin of comparer U2B by divider resistance R15, divider resistance R16, filter capacitor C4 is connected in parallel between 5 pin of comparer U2B and VinGND, 2 pin of comparer U2B are connected with 1 pin of triode Q2 by current-limiting resistance R19, 2 pin of triode Q2 are connected with Vin+, 3 pin of triode Q2 are connected with current-limiting resistance R14.
The utility model can regulate the acquisition range of input voltage signal by adjusting reference voltage and divider resistance according to the different demands of system; acquisition range is large; and because the existence of constant current source unit, can play the effect of overcurrent protection to input signal, security is higher.
Accompanying drawing explanation
Fig. 1 is the theory diagram of wide region signal acquisition circuit of the present utility model;
Fig. 2 is the circuit diagram of wide region signal acquisition circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model will be further described.
As shown in Figure 1, the utility model provides a kind of wide region signal acquisition circuit, comprises DC power source unit, constant current source unit, input detection unit and reference power source dividing potential drop comparing unit;
As shown in Figure 2, described DC power source unit comprises divider resistance R1, R2, R3, power supply chip D5, filter resistance R9, and filter capacitor C3 is used to provide working power and reference voltage;
Constant current source unit comprises counnter attack diode D6, D7, current-limiting resistance R13, R17, R20, R21, amplifier U1A, triode Q1, filter capacitor C5, is used to provide the constant current source that electric current is about 5mA, carries out overcurrent protection to input signal;
Input detection unit comprises counnter attack diode D2, stabilivolt D4, divider resistance R7, R8, current-limiting resistance R10, R14, R18, comparer U2A, optocoupler U3, filter capacitor C2, is used for detecting input voltage signal;
Reference power source dividing potential drop comparing unit comprises counnter attack diode D1, stabilivolt D3, divider resistance R4, R5, R6, R15, R16, current-limiting resistance R12, R19, amplifier U1B, comparer U2B, triode Q2, and filter capacitor C1, C4 are used to provide benchmark voltage;
Input power Vin+ is connected with 1 pin of filter resistance R9 and power supply chip D5 by divider resistance R1, divider resistance R2 is connected in parallel between 1 pin of power supply chip D5 and 2 pin, divider resistance R3 is connected in parallel between 2 pin of power supply chip D5 and 3 pin, 3 pin of power supply chip D5 are connected with VinGND, filter resistance R9 exports to survey and is connected with 3 pin of amplifier U1A, and the output that filter capacitor C3 is connected in parallel on filter resistance R9 is surveyed between VinGND;
Input voltage signal is connected with current-limiting resistance R20 by counnter attack diode D6, input power Vin+ is connected with current-limiting resistance R20 by counnter attack diode D7, current-limiting resistance R13, the other end of current-limiting resistance R20 is connected with 2 pin of triode Q1,1 pin of amplifier U1A is connected with 1 pin of triode Q1 by current-limiting resistance R17,2 pin of amplifier U1A are connected with 3 pin of triode Q1, and current-limiting resistance R21 and filter capacitor C5 is connected in parallel between 3 pin of triode Q1 and VinGND;
Input voltage signal is by counnter attack diode D2, be connected with 6 pin of comparer U2A by divider resistance R7 again, divider resistance R8, filter capacitor C2, stabilivolt D4 are connected in parallel between 6 pin of comparer U2A and VinGND, benchmark voltage is connected with 7 pin of comparer U2A by current-limiting resistance R10,1 pin of comparer U2A is connected with 2 pin of optocoupler U3,3 pin of Q2 are connected with 1 pin of optocoupler U3 by current-limiting resistance R14,3.3V power supply is connected with 4 pin of optocoupler U3 by current-limiting resistance R18,4 pin of optocoupler U3 are output signal, and 3 pin of optocoupler U3 meet GND;
Reference voltage is by diode D1, divider resistance R4, R5 is connected with 5 pin of amplifier U1B, divider resistance R6, filter capacitor C1, stabilivolt D3 is connected in parallel between 5 pin of amplifier U1B and VinGND, 6 pin of amplifier U1B are connected with 7 pin, 7 pin of amplifier U1B are benchmark voltage, be connected with 4 pin of comparer U2B by current-limiting resistance R12 again, Vin+ is connected with 5 pin of comparer U2B by divider resistance R15, divider resistance R16, filter capacitor C4 is connected in parallel between 5 pin of comparer U2B and VinGND, 2 pin of comparer U2B are connected with 1 pin of triode Q2 by current-limiting resistance R19, 2 pin of triode Q2 are connected with Vin+, 3 pin of triode Q2 are connected with current-limiting resistance R14.
Principle of work of the present utility model is as follows:
Input power Vin+, through power supply chip D5 output reference voltage, is connected with 3 pin of amplifier U1A, and under initial state, 2 pin of amplifier U1A are low level, are less than reference voltage, therefore the 1 pin output supply voltage of amplifier U1A, triode Q1 is open-minded; After triode Q1 opens; 2 pin and 3 pin of triode Q1 are equivalent to direct-connected; now input power passed through current-limiting resistance R13, R20 and R21 ground connection; the 3 pin voltages of triode Q1 raise; when being greater than reference voltage; triode Q1 turns off; get back to original state again; so repeatedly, system will keep dynamic stability, and now the magnitude of voltage of 3 pin of triode Q1 is reference voltage; the electric current flowing through triode Q1 collector and emitter is basicly stable and electric current is less; like this when there being input voltage signal, its electric current also can be stabilized in less value, plays a protective role.
Reference voltage exports benchmark voltage after dividing potential drop and voltage follow, when benchmark voltage is greater than the voltage of 5 pin of comparer U2B, and the 2 pin out-put supply ground of comparer U2B, triode Q2 conducting, the 3 pin output supply voltages of triode Q2; When there being input voltage signal, and when after dividing potential drop, the voltage of 6 pin of comparer U2A is greater than benchmark voltage, the 1 pin out-put supply ground of comparer U2A, optocoupler U3 conducting, output signal changes low level signal into by high level, by reading this signal, DSP judges whether input voltage meets the demands.The acquisition range of input voltage signal can be expanded further by the parameter adjusting divider resistance.
The foregoing is only preferred embodiment of the present utility model, be not restricted to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present utility model.
Claims (2)
1. a wide region signal acquisition circuit, is characterized in that: comprise DC power source unit, constant current source unit, input detection unit and reference power source dividing potential drop comparing unit;
Input voltage signal enters comparer after dividing potential drop, and the benchmark voltage exported by input detection unit and reference power source dividing potential drop comparing unit is made comparisons, thus drives optocoupler, and output detections signal is to key control unit; Constant current source unit can carry out overcurrent protection to the voltage signal of input simultaneously; DC power source unit is used to provide power supply and reference voltage.
2. a kind of wide region signal acquisition circuit application according to claim 1, is characterized in that:
Described DC power source unit comprises divider resistance R1, R2, R3, power supply chip D5, filter resistance R9, and filter capacitor C3 is used to provide working power and reference voltage;
Constant current source unit comprises counnter attack diode D6, D7, current-limiting resistance R13, R17, R20, R21, amplifier U1A, triode Q1, filter capacitor C5, is used to provide small electric stream constant current source, carries out overcurrent protection to input signal;
Input detection unit comprises counnter attack diode D2, stabilivolt D4, divider resistance R7, R8, current-limiting resistance R10, R14, R18, comparer U2A, optocoupler U3, filter capacitor C2, is used for detecting input voltage signal;
Reference power source dividing potential drop comparing unit comprises counnter attack diode D1, stabilivolt D3, divider resistance R4, R5, R6, R15, R16, current-limiting resistance R12, R19, amplifier U1B, comparer U2B, triode Q2, and filter capacitor C1, C4 are used to provide benchmark voltage;
Input power Vin+ is connected with 1 pin of filter resistance R9 and power supply chip D5 by divider resistance R1, divider resistance R2 is connected in parallel between 1 pin of power supply chip D5 and 2 pin, divider resistance R3 is connected in parallel between 2 pin of power supply chip D5 and 3 pin, 3 pin of power supply chip D5 are connected with VinGND, filter resistance R9 exports to survey and is connected with 3 pin of amplifier U1A, and the output that filter capacitor C3 is connected in parallel on filter resistance R9 is surveyed between VinGND;
Input voltage signal is connected with current-limiting resistance R20 by counnter attack diode D6, Vin+ is connected with current-limiting resistance R20 by counnter attack diode D7, current-limiting resistance R13, the other end of current-limiting resistance R20 is connected with 2 pin of triode Q1,1 pin of amplifier U1A is connected with 1 pin of triode Q1 by current-limiting resistance R17,2 pin of amplifier U1A are connected with 3 pin of triode Q1, and current-limiting resistance R21 and filter capacitor C5 is connected in parallel between 3 pin of triode Q1 and VinGND;
Input voltage signal is by counnter attack diode D2, be connected with 6 pin of comparer U2A by divider resistance R7 again, divider resistance R8, filter capacitor C2, stabilivolt D4 are connected in parallel between 6 pin of comparer U2A and VinGND, benchmark voltage is connected with 7 pin of comparer U2A by current-limiting resistance R10,1 pin of comparer U2A is connected with 2 pin of optocoupler U3,3 pin of Q2 are connected with 1 pin of optocoupler U3 by current-limiting resistance R14,3.3V power supply is connected with 4 pin of optocoupler U3 by current-limiting resistance R18,4 pin of optocoupler U3 are output signal, and 3 pin of optocoupler U3 meet GND;
Reference voltage is by diode D1, divider resistance R4, R5 is connected with 5 pin of amplifier U1B, divider resistance R6, filter capacitor C1, stabilivolt D3 is connected in parallel between 5 pin of amplifier U1B and VinGND, 6 pin of amplifier U1B are connected with 7 pin, 7 pin of amplifier U1B are benchmark voltage, be connected with 4 pin of comparer U2B by current-limiting resistance R12 again, Vin+ is connected with 5 pin of comparer U2B by divider resistance R15, divider resistance R16, filter capacitor C4 is connected in parallel between 5 pin of comparer U2B and VinGND, 2 pin of comparer U2B are connected with 1 pin of triode Q2 by current-limiting resistance R19, 2 pin of triode Q2 are connected with Vin+, 3 pin of triode Q2 are connected with current-limiting resistance R14.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520245849.5U CN204515010U (en) | 2015-04-22 | 2015-04-22 | A kind of wide region signal acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520245849.5U CN204515010U (en) | 2015-04-22 | 2015-04-22 | A kind of wide region signal acquisition circuit |
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| CN204515010U true CN204515010U (en) | 2015-07-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953629A (en) * | 2017-04-11 | 2017-07-14 | 深圳飞沃拜特技术有限公司 | Isolated form digital input circuit |
| CN109194323A (en) * | 2018-11-08 | 2019-01-11 | 常州朗奇威电器有限公司 | Optical coupling isolation circuit and its working method for motor control |
| CN110994966A (en) * | 2019-11-14 | 2020-04-10 | 中国航空工业集团公司西安航空计算技术研究所 | Airborne proximity sensor acquisition circuit |
| CN112379154A (en) * | 2020-10-30 | 2021-02-19 | 中车大连电力牵引研发中心有限公司 | Wide-range voltage signal acquisition circuit based on TL431 |
-
2015
- 2015-04-22 CN CN201520245849.5U patent/CN204515010U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953629A (en) * | 2017-04-11 | 2017-07-14 | 深圳飞沃拜特技术有限公司 | Isolated form digital input circuit |
| CN109194323A (en) * | 2018-11-08 | 2019-01-11 | 常州朗奇威电器有限公司 | Optical coupling isolation circuit and its working method for motor control |
| CN110994966A (en) * | 2019-11-14 | 2020-04-10 | 中国航空工业集团公司西安航空计算技术研究所 | Airborne proximity sensor acquisition circuit |
| CN112379154A (en) * | 2020-10-30 | 2021-02-19 | 中车大连电力牵引研发中心有限公司 | Wide-range voltage signal acquisition circuit based on TL431 |
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Granted publication date: 20150729 |