CN201707378U - High-accuracy linear isolating circuit based on common optical coupler - Google Patents
High-accuracy linear isolating circuit based on common optical coupler Download PDFInfo
- Publication number
- CN201707378U CN201707378U CN2010202290858U CN201020229085U CN201707378U CN 201707378 U CN201707378 U CN 201707378U CN 2010202290858 U CN2010202290858 U CN 2010202290858U CN 201020229085 U CN201020229085 U CN 201020229085U CN 201707378 U CN201707378 U CN 201707378U
- Authority
- CN
- China
- Prior art keywords
- photoelectrical coupler
- circuit
- path photoelectric
- photoelectric coupler
- ic1b
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Networks Using Active Elements (AREA)
Abstract
The utility model discloses a high-accuracy linear isolating circuit based on a common optical coupler, comprising a first-path photoelectric coupler (T1), a second-path photoelectric coupler (T2), a first operational amplifying circuit (IC1A) and a second operational amplifying circuit (IC1B), wherein the first-path photoelectric coupler (T1) is connected with the second-path photoelectric coupler (T2) in series; the second-path photoelectric coupler (T2) is connected with the first operational amplifying circuit (IC1A) in series; and the second operational amplifying circuit (IC1B) is connected with the second-path photoelectric coupler (T2) in parallel. Based on the negative feedback principle, the high-accuracy linear isolating circuit realizes high-accuracy linear isolating transmission on an analog signal by using the common two-path photoelectric couplers, and the circuit is simple and reliable, and has low cost and small occupied space; and the high-accuracy linear isolating circuit can be widely applied in electric isolation of input and output signals, and is especially applicable to miniaturized product design with more signals and independent return wires.
Description
Technical field
The utility model relates to a kind of circuit, and particularly a kind of high precision circuit linearity insulating circuit based on common optocoupler belongs to field of measuring technique.
Background technology
Photoelectrical coupler is made up of illuminator and light-receiving device two parts, and illuminator is a light emitting diode, and light-receiving device is a photosensitive triode, and the two is sealed in the same shell.When light-receiving device is accepted illumination, produce electric current output.Because electric signal is transmission medium with light, thereby realized the good isolation of input and output signal on electric, it has that volume is little, the life-span long, contactless, anti-interference, can isolate, outstanding advantage such as response speed is fast, be widely used in the electrical isolation of input/output signal.In addition, utilize photoelectrical coupler can also constitute and door or logical circuits such as door, Sheffer stroke gate.When the linearity coupling that utilizes photoelectrical coupler is directly isolated transmission to simulating signal, because the volt-ampere characteristic of photoelectrical coupler internal illumination diode and photosensitive triode, make " linear zone " of photoelectrical coupler in fact have nonlinear distortion to a certain degree, can't satisfy the measurement requirement of high linearity.The another kind of scheme of isolating transmission for the linearity of simulating signal adopts linear optical coupling to realize.But linear optical coupling need of work front and back end has the insulating power supply module to power, this for loop line independently the miniaturization product design of many signals can't realize.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of high precision circuit linearity insulating circuit based on common optocoupler, and this circuit can be realized linear isolation transmission of the high precision of simulating signal and circuit simple, reliable, thereby overcomes the deficiencies in the prior art.
For solving the problems of the technologies described above the technical solution of the utility model: based on the high precision circuit linearity insulating circuit of common optocoupler.Comprise first via photoelectrical coupler, No. the second photoelectrical coupler and first discharge circuit, second discharge circuit, described first via photoelectrical coupler is connected in series No. the second photoelectrical coupler, and No. the second photoelectrical coupler is connected in series first discharge circuit; Second discharge circuit and No. the second photoelectrical coupler are connected in parallel.
In the above-mentioned high precision circuit linearity insulating circuit based on common optocoupler, the collector of described first via photoelectrical coupler connects the collector of No. the second photoelectrical coupler; The emitter of first via photoelectrical coupler connects the positive pole of second discharge circuit, and the emitter of No. the second photoelectrical coupler connects the negative pole of second discharge circuit.
In the aforesaid high precision circuit linearity insulating circuit, be in series with resistance respectively at the emitter of the described first via photoelectrical coupler and No. the second photoelectrical coupler based on common optocoupler.
In the aforesaid high precision circuit linearity insulating circuit, between two resistance on the described emitter that is connected on the first via photoelectrical coupler and No. the second photoelectrical coupler, also be in series with adjusting resistance based on common optocoupler.
The beneficial effects of the utility model: the utility model adopts two-way photoelectrical coupler and double operational circuit to realize: at first, input signal is isolated output by first via optocoupler, then the output of first via optocoupler is fed back to the second road optocoupler and be used for input, adaptive equalization by the two-way optocoupler, remedied isolation transmission non-linear of single channel optocoupler, thereby realized the linearity of input signal is isolated transmission.The utility model is through multiple authentication, and nonlinearity is less than 1%, and except that optocoupler required to carry out the consistance screening, other devices did not have specific (special) requirements.Because there is the following forward voltage of 2V in diode, therefore should be applicable to non-omnidistance linear the isolate transmission of input signal by linearity isolation match circuit greater than 2V.Compared with prior art, the utility model is based on negative-feedback principle, realized linear isolation of the high precision of simulating signal transmitted by using common two-way photoelectric coupled device, circuit is simple, reliable, cheap, it is little to take up room, the electrical isolation that can be widely used in input/output signal is specially adapted to that signal is many, independently miniaturization product design of loop line.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Embodiment
Embodiment.As shown in Figure 1, two-way optocoupler D1 comprises the first via photoelectrical coupler T1 and No. the second photoelectrical coupler T2, and the double operational circuit comprises the first discharge circuit IC1A and the second discharge circuit IC1B.The first discharge circuit IC1A adopts to penetrate with circuit and carries out signal output, can satisfy the requirement of Low ESR output, thereby reduce the influence of interface circuit.The second discharge circuit IC1B is a feedback element, by regulating the electric current that flows through diode among No. the second photoelectrical coupler T2 with the feedback of first via photoelectrical coupler T1 output, make that the steady-state current of two-way optocoupler is equal substantially, thereby compensated adopt the single channel optocoupler to transmit non-linear.First via photoelectrical coupler T1 is connected in series No. the second photoelectrical coupler T2, and No. the second photoelectrical coupler T2 is connected in series the first discharge circuit IC1A; The second discharge circuit IC1B and No. the second photoelectrical coupler T2 are connected in parallel.The collector of first via photoelectrical coupler T1 connects the collector of No. the second photoelectrical coupler T2; The emitter of first via photoelectrical coupler T1 connects the positive pole of the second discharge circuit IC1B, and the emitter of No. the second photoelectrical coupler T2 connects the negative pole of the second discharge circuit IC1B.Emitter at first via photoelectrical coupler T1 is in series with resistance R 7, is in series with resistance R 6 at the emitter of No. the second photoelectrical coupler T2, is in series with to regulate resistance R 1 between resistance R 7 and resistance R 6.Resistance R 6 and resistance R 7 are converted into voltage with the triode output current and are used for the feedback input.Remedy the asymmetry of resistance R 6 and resistance R 7 by regulating resistance R 1, thereby make the discharge circuit IC1A that wins equal with the second discharge circuit IC1B positive and negative terminal voltage.
Photoelectrical coupler is the current mode device, and output voltage and electric current are directly proportional in linear zone.Therefore the first via photoelectrical coupler T1 and No. the second photoelectrical coupler T2 have very big consistance in same device, when the two emitter-base bandgap grading output voltage equated, the electric current of two diodes of flowing through equated.Therefore, the node current law is arranged, can get at the A point:
If the diode current flow pressure drop is
, input voltage is
, then
According to " empty disconnected " of amplifier, can get again
If amplifier IC1A output voltage is
, therefore to sum up can get,
, arrangement can get:
, choosing
So,
(formula 1)
Because in the practical application,
With
Not exclusively equate, when therefore adopting formula 1 to design, will inevitably bring the error of theoretical value and actual value.This main error is
,
Mistake is big more more.Provide below
,
,
,
,
Selection principle:
1. choose the size of working current according to the linear work district of optocoupler work, thereby calculate
With
2. determine resistance according to the proportionate relationship (formula 1) of voltage input and output
Size.
3. choose
Table 1 is one group of data of actual test.
Table 1 experimental test data
The two-way optocoupler is selected TLP621-2 for use in the experiment, and amplifier is selected TL082ID for use.The equation of fitting a straight line is as calculated:
, nonlinearity is 0.67%.Wherein,
Be match output,
Be the match input.
Embodiment of the present utility model is not limited to the foregoing description, all belongs within the protection domain of the present utility model in the various variations of making under the prerequisite that does not break away from the utility model aim.
Claims (4)
1. high precision circuit linearity insulating circuit based on common optocoupler, comprise first via photoelectrical coupler (T1), No. the second photoelectrical coupler (T2) and first discharge circuit (IC1A), second discharge circuit (IC1B), it is characterized in that: described first via photoelectrical coupler (T1) serial connection No. the second photoelectrical coupler (T2), No. the second photoelectrical coupler (T2) serial connection first discharge circuit (IC1A); Second discharge circuit (IC1B) is connected in parallel with No. the second photoelectrical coupler (T2).
2. the high precision circuit linearity insulating circuit based on common optocoupler according to claim 1 is characterized in that: the collector of described first via photoelectrical coupler (T1) connects the collector of No. the second photoelectrical coupler (T2); The emitter of first via photoelectrical coupler (T1) connects the positive pole of second discharge circuit (IC1B), and the emitter of No. the second photoelectrical coupler (T2) connects the negative pole of second discharge circuit (IC1B).
3. the high precision circuit linearity insulating circuit based on common optocoupler according to claim 2 is characterized in that: the emitter of described first via photoelectrical coupler (T1) and No. the second photoelectrical coupler (T2) be in series with respectively resistance (R7, R6).
4. the high precision circuit linearity insulating circuit based on common optocoupler according to claim 3, it is characterized in that: (R7 is in series with between R6) and regulates resistance (R1) two resistance on the described emitter that is connected on first via photoelectrical coupler (T1) and No. the second photoelectrical coupler (T2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202290858U CN201707378U (en) | 2010-06-18 | 2010-06-18 | High-accuracy linear isolating circuit based on common optical coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202290858U CN201707378U (en) | 2010-06-18 | 2010-06-18 | High-accuracy linear isolating circuit based on common optical coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201707378U true CN201707378U (en) | 2011-01-12 |
Family
ID=43444538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202290858U Expired - Fee Related CN201707378U (en) | 2010-06-18 | 2010-06-18 | High-accuracy linear isolating circuit based on common optical coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201707378U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395191A (en) * | 2017-06-16 | 2017-11-24 | 薄焕林 | A kind of passive linear optical coupling isolator |
| CN109471048A (en) * | 2018-12-29 | 2019-03-15 | 常熟开关制造有限公司(原常熟开关厂） | Low-cost electric pressure detection method and device, automatic change-over |
-
2010
- 2010-06-18 CN CN2010202290858U patent/CN201707378U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395191A (en) * | 2017-06-16 | 2017-11-24 | 薄焕林 | A kind of passive linear optical coupling isolator |
| CN109471048A (en) * | 2018-12-29 | 2019-03-15 | 常熟开关制造有限公司(原常熟开关厂） | Low-cost electric pressure detection method and device, automatic change-over |
| CN109471048B (en) * | 2018-12-29 | 2020-10-02 | 常熟开关制造有限公司(原常熟开关厂） | Low-cost voltage detection method and device and automatic transfer switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202870145U (en) | DC simulation signal acquisition circuit for public transformation terminal | |
| CN2938119Y (en) | Photoelectric coupling AC voltage separation measuring circuit | |
| CN201497766U (en) | Current sensor for realizing voltage sampling for current divider by adopting linear photoelectric coupler | |
| CN102594300B (en) | Light-operated signal generating circuit | |
| WO2017113550A1 (en) | Operational amplifier, driver interface, measuring and control device, driver circuit and driver | |
| CN201707378U (en) | High-accuracy linear isolating circuit based on common optical coupler | |
| CN204065210U (en) | The isolated DC voltage collection circuit of linear change | |
| CN103217615A (en) | Output short-circuit detection circuit | |
| CN203561672U (en) | A cell voltage sampling circuit used for microcomputer protection | |
| CN109861682B (en) | Optical coupler circuit and optical coupler for medium-speed communication | |
| CN204334501U (en) | A kind of push-pull type high resistant isolated amplifier | |
| CN205317377U (en) | Pressure sensor based on linear opto -coupler | |
| CN201766570U (en) | Passive 4-20 mA signal isolation receiving circuit based on linear photo coupler | |
| CN101706564B (en) | Cable failure flash detector calibrating device | |
| CN203870150U (en) | Isolation type power grid detector | |
| CN113242036B (en) | CTR (control line) adjustable method, optocoupler circuit and device | |
| CN205105222U (en) | Photoelectric conversion module and electric power communication system | |
| CN209676210U (en) | A kind of photoelectric coupled circuit and photoelectrical coupler for middling speed communication | |
| CN205265517U (en) | Dry node output circuit device that optic fibre is kept apart | |
| CN210225388U (en) | Photoelectric isolation module compatible with NPN and PNP type sensors | |
| CN202182914U (en) | A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals | |
| CN111900976A (en) | High-speed communication isolation circuit | |
| CN202330668U (en) | Multiplexing battery pack voltage measurement device | |
| CN202757980U (en) | Analog signal isolation detection circuit | |
| CN202870277U (en) | Power supply tele-metering circuit universally for multispectral remote sensing camera |
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 |
Granted publication date: 20110112 Termination date: 20140618 |
|
| EXPY | Termination of patent right or utility model |