CN102346216A - Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler - Google Patents
Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler Download PDFInfo
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- CN102346216A CN102346216A CN2011102353659A CN201110235365A CN102346216A CN 102346216 A CN102346216 A CN 102346216A CN 2011102353659 A CN2011102353659 A CN 2011102353659A CN 201110235365 A CN201110235365 A CN 201110235365A CN 102346216 A CN102346216 A CN 102346216A
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Abstract
The invention relates to a circuit capable of realizing accurate measurement of an alternating current zero-crossing signal by using a linear opticalcoupler. The circuit comprises a first power circuit, a second power circuit, a linear opticalcoupler input circuit, a linear opticalcoupler output circuit, a singlechip circuit and an alternating current zero-crossing detection circuit, wherein the first power circuit is connected with the linear opticalcoupler input circuit, the second power circuit is respectively connected with the linear opticalcoupler output circuit and the singlechip circuit, the alternating current zero-crossing detection circuit is connected with the linear opticalcoupler input circuit, the linear opticalcoupler input circuit is connected with the linear opticalcoupler output circuit, and the linear opticalcoupler output circuit is connected with the singlechip circuit. After the scheme is adopted, the circuit disclosed by the invention has the most outstanding advantages that: by using the excellent property of the linear opticalcoupler and a precise signal measurement circuit consisting of an integrated optical amplifier circuit and the singlechip circuit, the precise alternating current zero-crossing detection is realized.
Description
Technical field
The present invention relates to the technical field of electrical isolation, refer in particular to a kind of linear optical coupling that utilizes and realize the circuit that the alternating current zero cross signal is accurately measured.
Background technology
In commercial measurement and control system,, measuring system and computer system must be carried out electrical isolation for preventing extraneous various interference.Quarantine measures commonly used have transformer isolation, capacitive coupling to isolate and light-coupled isolation.Isolate with transformer isolation, capacitive coupling and to compare, the optocoupler volume is little, low price, buffer circuit simple and can eliminate fully before and after my phase mutual interference of level, have stronger antijamming capability.
For the isolation of digital signal, use general optocoupler to isolate and just can reach good effect.Yet general optocoupler has bigger non-linear current transport property and is acted upon by temperature changes greatlyyer, is difficult to satisfy system requirements for its precision of transmission and the linearity of simulating signal.In order to transmit simulating signal more accurately, isolating with linear optical coupling is best choice.Linear optical coupling output signal changes and proportional variation with input signal, and it has brought convenience for simplification, the high precision int of buffer circuit in the analog signal transmission.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of circuit safer, that utilize linear optical coupling realization alternating current zero cross signal accurately to measure more reliably is provided.
For realizing above-mentioned purpose; Technical scheme provided by the present invention is: a kind of linear optical coupling that utilizes is realized the circuit that the alternating current zero cross signal is accurately measured; It includes first power circuit; The second source circuit; The linear optical coupling input circuit; The linear optical coupling output circuit; Single chip circuit; The alternating current zero cross detection circuit; Wherein, First power circuit is connected with the linear optical coupling input circuit; The second source circuit is connected with single chip circuit with the linear optical coupling output circuit respectively; The alternating current zero cross detection circuit is connected with the linear optical coupling input circuit; The linear optical coupling input circuit is connected with the linear optical coupling output circuit, and the linear optical coupling output circuit is connected with single chip circuit.
Described linear optical coupling input circuit is made up of LED, the photodiode PD1 of resistance R 4, integrated transporting discharging U1A, capacitor C 3, resistance R 5, linear optical coupling U2; Wherein, The zero cross signal of resistance R 4 one ends and alternating current zero cross detection circuit is connected; Inverting input 2 pin of another termination integrated transporting discharging U1A, the in-phase input end 3 pin ground connection of integrated transporting discharging U1A; The two ends of capacitor C 3 connect output 1 pin and inverting input 2 pin of U1A respectively; 1 pin of one termination integrated transporting discharging U1A of resistance R 5,1 pin of other end wiring property optocoupler U2 is the negative pole of LED, 2 pin of linear optical coupling U2 are the positive pole that the positive pole of light emitting diode connects first power circuit; 3 pin of linear optical coupling U2 are 2 pin that the negative pole of photodiode PD1 meets integrated transporting discharging U1A, and 4 pin of linear optical coupling U2 are the negative pole that the positive pole of photodiode PD1 connects first power circuit; 8 pin of integrated transporting discharging U1A, 4 pin connect the both positive and negative polarity of first power circuit respectively.
Described linear optical coupling output circuit is made up of photodiode PD2, resistance R 6, capacitor C 2, integrated transporting discharging U2A, resistance R 7, the capacitor C 4 of linear optical coupling U2; Wherein, Output terminal 6 pin of linear optical coupling U2 are that the negative pole of photodiode PD2 and inverting input 2 pin of integrated transporting discharging U2A are connected, and output terminal 5 pin of linear optical coupling U2 are to be connected with the negative pole of second source circuit after in-phase input end 3 pin of positive pole and the integrated transporting discharging U2A of photodiode PD2 are connected again; The two ends of resistance R 6, capacitor C 2 connect 1 pin and 2 pin of integrated transporting discharging U2A respectively; 8 pin of integrated transporting discharging U2A, 4 pin connect the both positive and negative polarity of second source circuit respectively; 1 pin of one termination integrated transporting discharging U2A of resistance R 7, the positive pole of its another termination second source circuit; 1 pin of one termination integrated transporting discharging U2A of capacitor C 4, the negative pole of its another termination second source circuit.
Described first power circuit and second source circuit are independently stabilized voltage supply.
The present invention is after having adopted such scheme, and its great advantage is that the present invention utilizes the good characteristic of linear optical coupling and integrated operational amplifier circuit, single chip circuit to form accurate circuitry for signal measurement, realizes the accurate detection of zero-crossing of alternating current.
Description of drawings
Fig. 1 realizes the circuit block diagram that the alternating current zero cross signal is accurately measured for the present invention utilizes linear optical coupling.
Fig. 2 realizes the circuit theory diagrams that the alternating current zero cross signal is accurately measured for the present invention utilizes linear optical coupling.
Embodiment
Below in conjunction with specific embodiment the present invention is described further.
With reference to the accompanying drawings shown in 1 and 2; Preferred embodiment of the present invention includes first power circuit 1; Second source circuit 2; Linear optical coupling input circuit 3; Linear optical coupling output circuit 4; Single chip circuit 5; Alternating current zero cross detection circuit 6; Wherein, First power circuit 1 is connected with linear optical coupling input circuit 3; Second source circuit 2 is connected with single chip circuit 5 with linear optical coupling output circuit 4 respectively; Alternating current zero cross detection circuit 6 is connected with linear optical coupling input circuit 3; Linear optical coupling input circuit 3 is connected with linear optical coupling output circuit 4, and linear optical coupling output circuit 4 is connected with single chip circuit 5.
Described linear optical coupling input circuit 3 is made up of LED, the photodiode PD1 of resistance R 4, integrated transporting discharging U1A, capacitor C 3, resistance R 5, linear optical coupling U2; Wherein, The zero cross signal of resistance R 4 one ends and alternating current zero cross detection circuit 6 is connected; Inverting input 2 pin of another termination integrated transporting discharging U1A, the in-phase input end 3 pin ground connection of integrated transporting discharging U1A; The two ends of capacitor C 3 connect output 1 pin and inverting input 2 pin of U1A respectively; 1 pin of one termination integrated transporting discharging U1A of resistance R 5,1 pin of other end wiring property optocoupler U2 is the negative pole of LED, 2 pin of linear optical coupling U2 are the positive pole that the positive pole of light emitting diode connects first power circuit 1; 3 pin of linear optical coupling U2 are 2 pin that the negative pole of photodiode PD1 meets integrated transporting discharging U1A, and 4 pin of linear optical coupling U2 are the negative pole that the positive pole of photodiode PD1 connects first power circuit 1; 8 pin of integrated transporting discharging U1A, 4 pin connect the both positive and negative polarity of first power circuit 1 respectively; When the 220V alternating current is exported a square wave voltage signal after the optocoupler conversion of alternating current zero cross detection circuit 6, linear optical coupling input circuit 3 can convert current signal into by the square wave voltage signal of alternating current zero cross detection circuit 6 outputs.
Described linear optical coupling output circuit 4 is made up of photodiode PD2, resistance R 6, capacitor C 2, integrated transporting discharging U2A, resistance R 7, the capacitor C 4 of linear optical coupling U2; Wherein, Output terminal 6 pin of linear optical coupling U2 are that the negative pole of photodiode PD2 and inverting input 2 pin of integrated transporting discharging U2A are connected, and output terminal 5 pin of linear optical coupling U2 are to be connected with the negative pole of second source circuit 2 after in-phase input end 3 pin of positive pole and the integrated transporting discharging U2A of photodiode PD2 are connected again; The two ends of resistance R 6, capacitor C 2 connect 1 pin and 2 pin of integrated transporting discharging U2A respectively; 8 pin of integrated transporting discharging U2A, 4 pin connect the both positive and negative polarity of second source circuit 2 respectively; 1 pin of one termination integrated transporting discharging U2A of resistance R 7, the positive pole of its another termination second source circuit 2; 1 pin of one termination integrated transporting discharging U2A of capacitor C 4, the negative pole of its another termination second source circuit 2; The effect of linear optical coupling output circuit 4 of the present invention is that the current signal with opto-electronic conversion converts voltage signal to.
Described first power circuit 1 is independently stabilized voltage supply with second source circuit 2, respectively to linear optical coupling input circuit 3 and 4 power supplies of linear optical coupling output circuit, guarantees the isolation characteristic of test circuit.
Principle of work of the present invention is: the 220V alternating current is delivered to the input end of optocoupler IC1 after diode D1, resistance R 1 rectification step-down and current limliting; Its output terminal produces a square wave voltage signal; After resistance R 4 current limlitings, be input to the inverting input of integrated transporting discharging U1A again, the effect of integrated transporting discharging U1A is that voltage signal is transformed into current signal.When 2 pin have voltage signal Vin when input, its output terminal 1 pin makes the LED of linear optical coupling U2 have current i f to flow through, and the variation of current i f follows the variation of input voltage, and driving LED is luminous that electric signal is transformed into light signal.The light that LED sends is detected and produces photocurrent ipd1 by photodiode PD1.Simultaneously; Input voltage vin also can produce current flowing resistance R4; Suppose that integrated transporting discharging U1A is an ideal operational amplifier; Then there is not electric current to flow into the input end of integrated transporting discharging U1A; The electric current that flows through resistance R 4 will flow through photodiode PD1 to ground; So ipd1=Vin/R4, ipd1 only depends on that the value of input voltage vin and resistance R 4 and the light output characteristics of LED have nothing to do; The light that sends because of LED is radiated on two photodiodes simultaneously, and PD1 and PD2 are identical under the ideal situation; Integrated transporting discharging U2A and resistance R 6 convert ipd2 to output voltage V out, and Vout=ipd2*R6, Vout/Vin=R6/R4.Therefore, output voltage has stability and linearity, and its gain can realize with R4 through adjustment resistance R 6, general R4=R6.Vout=Vin then, size, the polarity of promptly exporting signal and input signal are identical, have realized the precision measurement of zero-crossing of alternating current, because of the isolation characteristic of circuit, have solved the influence that bring of the various interference of input end to test result simultaneously.
The embodiment of the above only is the present invention's preferred embodiment, is not to limit practical range of the present invention with this, so the variation that all shapes according to the present invention, principle are done all should be encompassed in protection scope of the present invention.
Claims (4)
1. one kind is utilized linear optical coupling to realize the circuit that the alternating current zero cross signal is accurately measured; It is characterized in that: it includes first power circuit (1); Second source circuit (2); Linear optical coupling input circuit (3); Linear optical coupling output circuit (4); Single chip circuit (5); Alternating current zero cross detection circuit (6); Wherein, First power circuit (1) is connected with linear optical coupling input circuit (3); Second source circuit (2) is connected with single chip circuit (5) with linear optical coupling output circuit (4) respectively; Alternating current zero cross detection circuit (6) is connected with linear optical coupling input circuit (3); Linear optical coupling input circuit (3) is connected with linear optical coupling output circuit (4), and linear optical coupling output circuit (4) is connected with single chip circuit (5).
2. a kind of linear optical coupling that utilizes according to claim 1 is realized the circuit that the alternating current zero cross signal is accurately measured; It is characterized in that: described linear optical coupling input circuit (3) is made up of LED, the photodiode PD1 of resistance R 4, integrated transporting discharging U1A, capacitor C 3, resistance R 5, linear optical coupling U2; Wherein, Resistance R 4 one ends are connected with the zero cross signal of alternating current zero cross detection circuit (6); Inverting input 2 pin of another termination integrated transporting discharging U1A, the in-phase input end 3 pin ground connection of integrated transporting discharging U1A; The two ends of capacitor C 3 connect output 1 pin and inverting input 2 pin of U1A respectively; 1 pin of one termination integrated transporting discharging U1A of resistance R 5,1 pin of other end wiring property optocoupler U2 is the negative pole of LED, 2 pin of linear optical coupling U2 are the positive pole that the positive pole of light emitting diode connects first power circuit (1); 3 pin of linear optical coupling U2 are 2 pin that the negative pole of photodiode PD1 meets integrated transporting discharging U1A, and 4 pin of linear optical coupling U2 are the negative pole that the positive pole of photodiode PD1 connects first power circuit (1); 8 pin of integrated transporting discharging U1A, 4 pin connect the both positive and negative polarity of first power circuit (1) respectively.
3. a kind of linear optical coupling that utilizes according to claim 1 is realized the circuit that the alternating current zero cross signal is accurately measured; It is characterized in that: described linear optical coupling output circuit (4) is by the photodiode PD2 of linear optical coupling U2; Resistance R 6; Capacitor C 2; Integrated transporting discharging U2A; Resistance R 7; Capacitor C 4 is formed; Wherein, Output terminal 6 pin of linear optical coupling U2 are that the negative pole of photodiode PD2 and inverting input 2 pin of integrated transporting discharging U2A are connected, and output terminal 5 pin of linear optical coupling U2 are to be connected with the negative pole of second source circuit (2) after in-phase input end 3 pin of positive pole and the integrated transporting discharging U2A of photodiode PD2 are connected again; The two ends of resistance R 6, capacitor C 2 connect 1 pin and 2 pin of integrated transporting discharging U2A respectively; 8 pin of integrated transporting discharging U2A, 4 pin connect the both positive and negative polarity of second source circuit (2) respectively; 1 pin of one termination integrated transporting discharging U2A of resistance R 7, the positive pole of its another termination second source circuit (2); 1 pin of one termination integrated transporting discharging U2A of capacitor C 4, the negative pole of its another termination second source circuit (2).
4. a kind of linear optical coupling that utilizes according to claim 1 is realized the circuit that the alternating current zero cross signal is accurately measured, and it is characterized in that: described first power circuit (1) and second source circuit (2) are independently stabilized voltage supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102353659A CN102346216A (en) | 2011-08-17 | 2011-08-17 | Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler |
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| CN2011102353659A CN102346216A (en) | 2011-08-17 | 2011-08-17 | Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler |
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| CN102346216A true CN102346216A (en) | 2012-02-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090152A (en) * | 2014-06-16 | 2014-10-08 | 福建睿能科技股份有限公司 | Power failure detection circuit of flat knitting machine and power failure detection method thereof |
| CN107525961A (en) * | 2016-06-22 | 2017-12-29 | 南京理工大学 | AC signal zero crossing point detection device |
| CN108475994A (en) * | 2015-12-28 | 2018-08-31 | 大金工业株式会社 | Supply unit, the DC-to-AC converter for having used the supply unit and converter apparatus and the refrigerating plant and air purifier for having used the DC-to-AC converter or converter apparatus |
| WO2020211114A1 (en) * | 2019-04-19 | 2020-10-22 | 青岛亿联客信息技术有限公司 | Flash switch control system and input flash detection circuit thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201341115Y (en) * | 2008-11-05 | 2009-11-04 | 中国北车股份有限公司大连电力牵引研发中心 | Isolation amplification circuit of alternating-current analog electrical signal based on linear optical coupler |
| CN201549065U (en) * | 2009-11-27 | 2010-08-11 | 成都瑞联电气股份有限公司 | Linear photoelectric isolator with passive input |
| CN202182914U (en) * | 2011-08-17 | 2012-04-04 | 佛山市中格威电子有限公司 | A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals |
-
2011
- 2011-08-17 CN CN2011102353659A patent/CN102346216A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201341115Y (en) * | 2008-11-05 | 2009-11-04 | 中国北车股份有限公司大连电力牵引研发中心 | Isolation amplification circuit of alternating-current analog electrical signal based on linear optical coupler |
| CN201549065U (en) * | 2009-11-27 | 2010-08-11 | 成都瑞联电气股份有限公司 | Linear photoelectric isolator with passive input |
| CN202182914U (en) * | 2011-08-17 | 2012-04-04 | 佛山市中格威电子有限公司 | A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090152A (en) * | 2014-06-16 | 2014-10-08 | 福建睿能科技股份有限公司 | Power failure detection circuit of flat knitting machine and power failure detection method thereof |
| CN104090152B (en) * | 2014-06-16 | 2017-05-17 | 福建睿能科技股份有限公司 | Power failure detection circuit of flat knitting machine and power failure detection method thereof |
| CN108475994A (en) * | 2015-12-28 | 2018-08-31 | 大金工业株式会社 | Supply unit, the DC-to-AC converter for having used the supply unit and converter apparatus and the refrigerating plant and air purifier for having used the DC-to-AC converter or converter apparatus |
| CN107525961A (en) * | 2016-06-22 | 2017-12-29 | 南京理工大学 | AC signal zero crossing point detection device |
| WO2020211114A1 (en) * | 2019-04-19 | 2020-10-22 | 青岛亿联客信息技术有限公司 | Flash switch control system and input flash detection circuit thereof |
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Application publication date: 20120208 |