CN102607604A - Phase-sensitive detection circuit - Google Patents
Phase-sensitive detection circuit Download PDFInfo
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- CN102607604A CN102607604A CN201210067151XA CN201210067151A CN102607604A CN 102607604 A CN102607604 A CN 102607604A CN 201210067151X A CN201210067151X A CN 201210067151XA CN 201210067151 A CN201210067151 A CN 201210067151A CN 102607604 A CN102607604 A CN 102607604A
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- 238000011896 sensitive detection Methods 0.000 title claims abstract description 28
- 230000005284 excitation Effects 0.000 claims abstract description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 abstract 3
- 230000002401 inhibitory effect Effects 0.000 abstract 2
- 101100109978 Arabidopsis thaliana ARP3 gene Proteins 0.000 description 4
- 101100163122 Arabidopsis thaliana ARPC2A gene Proteins 0.000 description 4
- 101100191082 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GLC7 gene Proteins 0.000 description 4
- 101100427547 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ULS1 gene Proteins 0.000 description 4
- 101100030351 Schizosaccharomyces pombe (strain 972 / ATCC 24843) dis2 gene Proteins 0.000 description 4
- 101150117607 dis1 gene Proteins 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
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Abstract
The invention discloses a phase-sensitive detection circuit, which comprises a comparator IC1A, a comparator IC1B, a non-inverting amplifier IC2, an inverting amplifier IC3, a resistor R8, a resistor R14 and a capacitor E1, wherein the non-inverting end of the comparator IC1A is used for receiving an excitation sine wave signal; the output end of the comparator IC1A is connected with the inhibiting end of the inverting amplifier IC3; the inverting end of the comparator IC1B is used for receiving an excitation sine wave signal; the output end of the comparator IC1B is connected with the inhibiting end of the non-inverting amplifier IC2; the non-inverting input end of the non-inverting amplifier IC2 is used for receiving an output signal of a differential transformer; the inverting input end of the non-inverting amplifier IC2 is grounded, and is connected with the output end of the non-inverting amplifier IC2 through a resistor R7; the non-inverting and inverting input ends of the inverting amplifier IC3 are used for receiving an output signal of the differential transformer; the non-inverting input end of the inverting amplifier IC3 is grounded through a resistor R11; the inverting input end of the inverting amplifier IC3 is connected with the output end of the inverting amplifier IC3 through a resistor R13; the output end of the non-inverting amplifier IC2 is connected with the output end of the inverting amplifier IC3 through the resistor R8 and the resistor R14 which are connected in series; and one end of the capacitor E1 is connected with the connected end of the resistor R8 and the resistor R14, and the other end of the capacitor E1 is grounded.
Description
Technical field
The present invention relates to a kind of phase-sensitive detection circuit.
Background technology
Differential transformer (LVDT) is a kind of potential device that is widely used in electronic technology and the non electrical quantity detection, is used for non electrical quantity parameters such as Displacement Measurement, pressure, vibration.It both can be used for static measurement, also can be used for kinetic measurement.When handling the LVDT signal, to use phase-sensitive detection circuit usually; Traditional phase-sensitive detection circuit adopts the diode with nonlinear effect, the integrated analog switch with certain output impedance or has the change-over switch of the FET of certain tube voltage drop as control operational amplifier input end when opening, and therefore has the drawback that influences operational amplifier signal Processing precision.At present, AD598 is an available single-chip phase sensitive detection solution on the market, but its unit price is comparatively expensive, is not suitable for cost performance is had the occasion of requirement.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and a kind of phase-sensitive detection circuit is provided, its realizes phase sensitive detection function, and extremely simple, has very good processing accuracy.
The technical scheme that realizes above-mentioned purpose is:
A kind of phase-sensitive detection circuit; Connect differential transformer; The former edge joint of this differential transformer is received an excitation sine wave signal; Said phase-sensitive detection circuit is imported the output signal of said excitation sine wave signal and said differential transformer, and said phase-sensitive detection circuit comprises comparer IC1A, comparer IC1B, in-phase amplifier IC2, inverting amplifier IC3, resistance R 8, resistance R 14 and electric capacity E1, wherein:
The in-phase end of comparer IC1A receives said excitation sine wave signal through resistance R 2, end of oppisite phase ground connection, and output terminal connects the end of forbidding of inverting amplifier IC3;
The end of oppisite phase of comparer IC1B receives said excitation sine wave signal through resistance R 1, in-phase end ground connection, and output terminal connects the end of forbidding of in-phase amplifier IC2;
The in-phase input end of in-phase amplifier IC2 is through the output signal of the said differential transformer of resistance R 5 receptions, and inverting input is through resistance R 6 ground connection, and inverting input connects its output terminals through resistance R 7;
The same inverting input of inverting amplifier IC3 is through the output signal of the said differential transformer of resistance R 12 receptions, and in-phase input end is through resistance R 11 ground connection, and inverting input connects its output terminals through resistance R 13;
The output terminal of in-phase amplifier IC2 is connected the output terminal of inverting amplifier IC3 with resistance R 14 through the resistance R 8 of series connection;
The end of electric capacity E1 connects the end that joins of resistance R 8 and resistance R 14, other end ground connection.
Above-mentioned phase-sensitive detection circuit, wherein, the in-phase end of comparer IC1A is through voltage stabilizing diode W2 ground connection; The end of oppisite phase of comparer IC1B is through voltage stabilizing diode W1 ground connection.
Above-mentioned phase-sensitive detection circuit, wherein, the end of forbidding of in-phase amplifier IC2 connects power supply and passes through resistance R 4 ground connection through resistance R 3; The end of forbidding of inverting amplifier IC3 connects power supply and passes through resistance R 10 ground connection through resistance R 9.
Above-mentioned phase-sensitive detection circuit, wherein, said power supply is 5V.
Above-mentioned phase-sensitive detection circuit, wherein, in-phase amplifier IC2 and inverting amplifier IC3 all are that model is the operational amplifier of OPA221.
The invention has the beneficial effects as follows: phase-sensitive detection circuit of the present invention has the meaning of original creation, and it has very good processing accuracy, and extremely simple, so it has, and volume is little, easy to be realized and the high advantage of cost performance.
Description of drawings
Fig. 1 is the circuit diagram of phase-sensitive detection circuit of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1; Phase-sensitive detection circuit of the present invention; Connect differential transformer T1, the former edge joint of this differential transformer T1 is received an excitation sine wave signal OSC, the output signal SIG of said phase-sensitive detection circuit input stimulus sine wave signal OSC and differential transformer T1; Said phase-sensitive detection circuit comprises comparer IC1A, comparer IC1B, in-phase amplifier IC2, inverting amplifier IC3, resistance R 8, resistance R 14 and electric capacity E1, wherein:
The in-phase end of comparer IC1A receives excitation sine wave signal OSC through resistance R 2, end of oppisite phase ground connection, and output terminal connects the end of forbidding of inverting amplifier IC3; The end of oppisite phase of comparer IC1B receives excitation sine wave signal OSC through resistance R 1, in-phase end ground connection, and output terminal connects the end of forbidding of in-phase amplifier IC2;
The in-phase input end of in-phase amplifier IC2 is through the output signal SIG of resistance R 5 reception differential transformer T1, and inverting input is through resistance R 6 ground connection, and inverting input connects its output terminals through resistance R 7;
The same inverting input of inverting amplifier IC3 is through the output signal SIG of resistance R 12 reception differential transformer T1, and in-phase input end is through resistance R 11 ground connection, and inverting input connects its output terminals through resistance R 13;
The output terminal of in-phase amplifier IC2 is connected the output terminal of inverting amplifier IC3 with resistance R 14 through the resistance R 8 of series connection; The end of electric capacity E1 connects the end that joins of resistance R 8 and resistance R 14, other end ground connection; Resistance R 8, resistance R 14 constitute the output smoothing network of in-phase amplifier IC2 and inverting amplifier IC3 respectively with electric capacity E1, get excitation about 3 times time constant of sine wave signal OSC cycle;
The in-phase end of comparer IC1A is through voltage stabilizing diode W2 ground connection; The end of oppisite phase of comparer IC1B is through voltage stabilizing diode W1 ground connection;
The end of forbidding of in-phase amplifier IC2 connects power supply and passes through resistance R 4 ground connection through resistance R 3; The end of forbidding of inverting amplifier IC3 connects power supply and passes through resistance R 10 ground connection through resistance R 9; Power supply is 5V.
In the present embodiment; In-phase amplifier IC2 and inverting amplifier IC3 all are that model is the operational amplifier of OPA221, and OPA221 is that a ultra-low noise, band are forbidden the low price high-performance amplifier of holding, and it forbids that end (Pin 8) goes up when inserting positive level; Device output is high resistant, and output is closed; When forbidding that end (Pin 8) is gone up the access zero level, output is enabled; The model that comparer IC1A and comparer IC1B select for use is LM339.
Principle of the present invention: the armature of differential transformer T1 of supposition Fig. 1 leaves initial point and prolongs axially and depart from left, then exports signal SIG and excitation sine wave signal OSC homophase (for just).When the former limit of differential transformer T1 added excitation sine wave signal OSC, at the upper half of excitation sine wave signal OSC, comparer IC1A output DIS2 was a high level; Comparer IC1B output DIS1 is a low level; Therefore, inverting amplifier IC3 output is under an embargo, and in-phase amplifier IC2 output is enabled; Because the input signal of in-phase amplifier IC2 and inverting amplifier IC3 and excitation sine wave signal OSC homophase, sinusoidal wave first wave envelope of in-phase amplifier IC2 output cathode property; When excitation sine wave signal OSC zero passage gets into lower half; Comparer IC1A output DIS2 is a low level; Comparer IC1B output DIS1 is a high level, and therefore, inverting amplifier IC3 output is enabled; In-phase amplifier IC2 output is under an embargo, the sinusoidal wave envelope of inverting amplifier IC3 output cathode property lower half; The output of synthetic in-phase amplifier IC2 and inverting amplifier IC3 obtains the positive polarity sine wave envelope of similar full-wave rectification.
Prolong when axially departing to the right when the armature of the differential transformer T1 among Fig. 1 leaves initial point, then export signal SIG and excitation sine wave signal OSC anti-phase.Upper half at excitation sine wave signal OSC; Comparer IC1A output DIS2 is a high level, and comparer IC1B output DIS1 is a low level, therefore; Inverting amplifier IC3 output is under an embargo; In-phase amplifier IC2 output is enabled, because the input signal of in-phase amplifier IC2 and inverting amplifier IC3 and excitation sine wave signal OSC anti-phase, the sinusoidal wave half-wave envelope of in-phase amplifier IC2 output negative pole property; When excitation sine wave signal OSC zero passage gets into lower half; Comparer IC1A output DIS2 is a low level; Comparer IC1B output DIS1 is a high level, and therefore, inverting amplifier IC3 output is enabled; In-phase amplifier IC2 output is under an embargo, the sinusoidal wave envelope of inverting amplifier IC3 output negative pole property lower half; The output of synthetic in-phase amplifier IC2 and inverting amplifier IC3 obtains the negative polarity sine wave envelope of similar full-wave rectification.
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technician in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (5)
1. phase-sensitive detection circuit; Connect differential transformer; The former edge joint of this differential transformer is received an excitation sine wave signal, and said phase-sensitive detection circuit is imported the output signal of said excitation sine wave signal and said differential transformer, it is characterized in that; Said phase-sensitive detection circuit comprises comparer IC1A, comparer IC1B, in-phase amplifier IC2, inverting amplifier IC3, resistance R 8, resistance R 14 and electric capacity E1, wherein:
The in-phase end of comparer IC1A receives said excitation sine wave signal through resistance R 2, end of oppisite phase ground connection, and output terminal connects the end of forbidding of inverting amplifier IC3;
The end of oppisite phase of comparer IC1B receives said excitation sine wave signal through resistance R 1, in-phase end ground connection, and output terminal connects the end of forbidding of in-phase amplifier IC2;
The in-phase input end of in-phase amplifier IC2 is through the output signal of the said differential transformer of resistance R 5 receptions, and inverting input is through resistance R 6 ground connection, and inverting input connects its output terminals through resistance R 7;
The same inverting input of inverting amplifier IC3 is through the output signal of the said differential transformer of resistance R 12 receptions, and in-phase input end is through resistance R 11 ground connection, and inverting input connects its output terminals through resistance R 13;
The output terminal of in-phase amplifier IC2 is connected the output terminal of inverting amplifier IC3 with resistance R 14 through the resistance R 8 of series connection;
The end of electric capacity E1 connects the end that joins of resistance R 8 and resistance R 14, other end ground connection.
2. phase-sensitive detection circuit according to claim 1 is characterized in that, the in-phase end of comparer IC1A is through voltage stabilizing diode W2 ground connection; The end of oppisite phase of comparer IC1B is through voltage stabilizing diode W1 ground connection.
3. phase-sensitive detection circuit according to claim 1 and 2 is characterized in that, the end of forbidding of in-phase amplifier IC2 connects power supply and passes through resistance R 4 ground connection through resistance R 3; The end of forbidding of inverting amplifier IC3 connects power supply and passes through resistance R 10 ground connection through resistance R 9.
4. phase-sensitive detection circuit according to claim 3 is characterized in that, said power supply is 5V.
5. phase-sensitive detection circuit according to claim 1 is characterized in that, in-phase amplifier IC2 and inverting amplifier IC3 all are that model is the operational amplifier of OPA221.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210067151.XA CN102607604B (en) | 2012-03-15 | 2012-03-15 | Phase-sensitive detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210067151.XA CN102607604B (en) | 2012-03-15 | 2012-03-15 | Phase-sensitive detection circuit |
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| CN102607604A true CN102607604A (en) | 2012-07-25 |
| CN102607604B CN102607604B (en) | 2014-08-13 |
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| CN201210067151.XA Expired - Fee Related CN102607604B (en) | 2012-03-15 | 2012-03-15 | Phase-sensitive detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019833A (en) * | 2014-06-13 | 2014-09-03 | 四川亚美动力技术有限公司 | Engine oil pin position sensor detecting circuit |
| CN109342326A (en) * | 2018-11-15 | 2019-02-15 | 上海仪电物理光学仪器有限公司 | A kind of phase-sensitive detection circuit of automatic polarimeter |
| CN110208616A (en) * | 2019-05-28 | 2019-09-06 | 中国科学院武汉物理与数学研究所 | A kind of rubidium atomic clock working condition detection signal measurement apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4464661A (en) * | 1982-02-18 | 1984-08-07 | The Ltv Aerospace And Defense Company | System monitor circuit having first and second phase-sensitive demodulator circuits coupled to first and second loads, and a comparator section for monitoring the loads |
| JP3827661B2 (en) * | 2003-09-01 | 2006-09-27 | 株式会社千葉精密 | Signal processing circuit of differential capacitive transducer |
| CN201569409U (en) * | 2009-12-23 | 2010-09-01 | 蒋勤舟 | Transformer-type non-contact angle sensor |
-
2012
- 2012-03-15 CN CN201210067151.XA patent/CN102607604B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4464661A (en) * | 1982-02-18 | 1984-08-07 | The Ltv Aerospace And Defense Company | System monitor circuit having first and second phase-sensitive demodulator circuits coupled to first and second loads, and a comparator section for monitoring the loads |
| JP3827661B2 (en) * | 2003-09-01 | 2006-09-27 | 株式会社千葉精密 | Signal processing circuit of differential capacitive transducer |
| CN201569409U (en) * | 2009-12-23 | 2010-09-01 | 蒋勤舟 | Transformer-type non-contact angle sensor |
Non-Patent Citations (3)
| Title |
|---|
| 胡仲秋: "一种相敏检波电路的研究与实验", 《内江师范学院学报》, vol. 24, no. 2, 28 February 2009 (2009-02-28), pages 50 - 52 * |
| 金侃、张德芬、张国雄: "用于智能化仪表的高精度相敏检波电路", 《自动化与仪表》, no. 2, 31 December 1992 (1992-12-31), pages 23 - 24 * |
| 陈金岭: "带相敏检波器的线性可变差动变压器（LVDT）读出电路的设计", 《成都气象学院学报》, no. 2, 31 December 1989 (1989-12-31), pages 49 - 54 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019833A (en) * | 2014-06-13 | 2014-09-03 | 四川亚美动力技术有限公司 | Engine oil pin position sensor detecting circuit |
| CN104019833B (en) * | 2014-06-13 | 2016-06-08 | 四川亚美动力技术有限公司 | Engine oil needle position sensor detection circuit |
| CN109342326A (en) * | 2018-11-15 | 2019-02-15 | 上海仪电物理光学仪器有限公司 | A kind of phase-sensitive detection circuit of automatic polarimeter |
| CN110208616A (en) * | 2019-05-28 | 2019-09-06 | 中国科学院武汉物理与数学研究所 | A kind of rubidium atomic clock working condition detection signal measurement apparatus |
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| CN102607604B (en) | 2014-08-13 |
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Free format text: CORRECT: INVENTOR; FROM: LI JIANGUO LI RONGZHENG ZHOU LIANG TANG YI JIANG MEIFEN TO: LI JIANGUO CHEN YANG Free format text: CORRECT: ADDRESS; FROM: 201103 MINHANG, SHANGHAI TO: 200336 CHANGNING, SHANGHAI |
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