CN202182914U - A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals - Google Patents
A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals Download PDFInfo
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- CN202182914U CN202182914U CN2011202985404U CN201120298540U CN202182914U CN 202182914 U CN202182914 U CN 202182914U CN 2011202985404 U CN2011202985404 U CN 2011202985404U CN 201120298540 U CN201120298540 U CN 201120298540U CN 202182914 U CN202182914 U CN 202182914U
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Abstract
The utility model provides a circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals. The circuit includes a first power source circuit, a second power source circuit, a linear optical coupler input circuit, a linear optical coupler output circuit, a single-chip microprocessor circuit, and an AC zero passage detecting circuit. The first power source circuit connects with the linear optical coupler input circuit. The second power source circuit connects with the linear optical coupler output circuit and the single-chip microprocessor circuit respectively. The AC zero passage detecting circuit connects with the linear optical coupler input circuit. The linear optical coupler input circuit connects with the linear optical coupler output circuit. In the linear optical coupler output circuit connects with the single-chip microprocessor circuit. By adopting the above scheme, the circuit utilizing the linear optical coupler to realize accurate measurement of the AC zero passage signals in the utility model, by utilizing good characteristics of the linear optical coupler, an accurate signal measuring circuit is formed by the linear optical coupler, an integrated transmittal circuit and the single-chip microprocessor circuit, thereby realizing the accurate measurement of AC zero crossing points.
Description
Technical field
The utility model relates to the technical field of electrical isolation, refers in particular to a kind of linear optical coupling that utilizes and realizes the circuit that the alternating current zero cross signal is accurately measured.
Background technology
In commercial measurement and control system,, must measuring system and computer system 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 purpose of the utility model is to overcome the deficiency of prior art, and 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; The technical scheme that the utility model provided 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, second source circuit, linear optical coupling input circuit, linear optical coupling output circuit, single chip circuit, alternating current zero cross detection circuit; Wherein, First power circuit is connected with the linear optical coupling input circuit, and the second source circuit is connected with single chip circuit with the linear optical coupling output circuit respectively, and 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 utility model is after having adopted such scheme, and its great advantage is that the utility model 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 utility model utilizes linear optical coupling.
Fig. 2 realizes the circuit theory diagrams that the alternating current zero cross signal is accurately measured for the utility model utilizes linear optical coupling.
Embodiment
Below in conjunction with specific embodiment the utility model is described further.
According to attaching shown in Fig. 1 and 2; The preferred embodiment of the utility model 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, and second source circuit 2 is connected with single chip circuit 5 with linear optical coupling output circuit 4 respectively, and 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 the linear optical coupling output circuit 4 of the utility model 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.
The principle of work of the utility model 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 is transformed into light signal to electric 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, supposes that integrated transporting discharging U1A is an ideal operational amplifier, does not then have 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 is the preferred embodiment of the utility model only, is not the practical range that limits the utility model with this, so the variation that all shapes according to the utility model, principle are done all should be encompassed in the protection domain of the utility model.
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), and 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 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).
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202985404U CN202182914U (en) | 2011-08-17 | 2011-08-17 | A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202985404U CN202182914U (en) | 2011-08-17 | 2011-08-17 | A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals |
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| Publication Number | Publication Date |
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| CN202182914U true CN202182914U (en) | 2012-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202985404U Expired - Lifetime CN202182914U (en) | 2011-08-17 | 2011-08-17 | A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals |
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| CN (1) | CN202182914U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346216A (en) * | 2011-08-17 | 2012-02-08 | 佛山市中格威电子有限公司 | Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler |
| CN102879633A (en) * | 2012-09-25 | 2013-01-16 | 上海微频莱机电科技有限公司 | Safety protective structure of zero-crossing detection circuit |
-
2011
- 2011-08-17 CN CN2011202985404U patent/CN202182914U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346216A (en) * | 2011-08-17 | 2012-02-08 | 佛山市中格威电子有限公司 | Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler |
| CN102879633A (en) * | 2012-09-25 | 2013-01-16 | 上海微频莱机电科技有限公司 | Safety protective structure of zero-crossing detection circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120404 |