CN201654996U - Photoelectric isolation linear transducer - Google Patents
Photoelectric isolation linear transducer Download PDFInfo
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- CN201654996U CN201654996U CN2010200264191U CN201020026419U CN201654996U CN 201654996 U CN201654996 U CN 201654996U CN 2010200264191 U CN2010200264191 U CN 2010200264191U CN 201020026419 U CN201020026419 U CN 201020026419U CN 201654996 U CN201654996 U CN 201654996U
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- resistance
- optocoupler
- operational amplifier
- circuit
- linear quantizer
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Abstract
A photoelectric isolation linear transducer comprises a double-optical-coupled circuit, an integrating circuit and an adder circuit. Input voltage Ui is converted into output voltage U2 through photoelectric isolation and via the integrating circuit and the adder circuit, the output voltage U3 and the input voltage Ui are in linear proportional relationship by means of adjusting adjustable resistor VR2 of the adder circuit, and the proportional value is relative with resistance. Therefore, the linear transducer can not only realize photoelectric isolation but realize linear transmission of analog signals, and is simple in circuit, low in cost and convenient in debugging.
Description
Technical field:
The utility model relates to a kind of photoelectricity that can linearly transmit simulating signal and isolates linear quantizer.
Background technology:
In order to improve the reliability of single-chip computer control system, reduce the influence of external disturbance to single-chip microcomputer, the method that digital display circuit generally all adopts photoelectricity to isolate is isolated external system.Isolate for switching value and generally all to adopt light-coupled isolation.And the input of analog quantity, output be if adopt linear optical coupling, or the special-purpose integrated circuit of isolating, and will significantly improve the cost of product, and special IC will increase the complexity of circuit simultaneously, thereby the sale of product is caused adverse influence.
Summary of the invention:
The purpose of this utility model proposes a kind of photoelectricity exactly and isolates linear quantizer, can linearly transmit simulating signal, and circuit is simple, and cost is low, and debugging is convenient.
For achieving the above object, a kind of photoelectricity of the utility model is isolated linear quantizer, comprising:
Two photoelectric coupled circuit, comprise two optocoupler A, B that parameter is identical, input voltage Ui is applied to the photodiode two ends of optocoupler A through resistance R 1, resistance R is connected between the photodiode positive pole and ground wire of optocoupler B, the phototriode emitter of optocoupler A, B connects ground wire through the identical resistance R 3 of resistance, R4 respectively, and the phototriode pipe collector of optocoupler A, B all connects power supply VCC;
Integrating circuit, comprise an operational amplifier IC2, capacitor C 2 is connected across between the negative input end and output terminal of operational amplifier IC2, the negative input end of operational amplifier IC2 connects the phototriode emitter of optocoupler A, positive input terminal connects the phototriode emitter of optocoupler B, and output terminal connects the photodiode negative pole of optocoupler B;
Adding circuit, comprise an operational amplifier IC3, resistance R 5 and adjustable resistance VR2 series connection, be connected between power supply VCC and the ground wire, the tie point of resistance R 5 and adjustable resistance VR2 is through the negative input end of resistance R 6 concatenation operation amplifier IC3, the output terminal of operational amplifier IC2 is through the resistance R 7 also negative input end of concatenation operation amplifier IC3, the positive input terminal of operational amplifier IC3 connects ground wire through resistance R 8, resistance R 9 is connected across between the negative input end and output terminal of operational amplifier IC3, the output terminal output voltage U 3 of operational amplifier IC3.
In a kind of preferred implementation, the resistance R 6 of above-mentioned adding circuit, R7, R9 resistance are identical, and resistance R 8 resistances are the parallel connection value of resistance R 6, R7, R9 resistance.
The resistance of resistance R 8 also can be zero, and at this moment, the positive input terminal of operational amplifier IC3 directly connects ground wire.
The utility model input voltage Ui through light-coupled isolation again through operational amplifier IC2, behind the IC3, output voltage U 3, by regulating adjustable resistance VR2, can make output voltage U 3 and input voltage Ui be the linear ratio relation, ratio value is only relevant with resistance value, so when the utility model realizes that electricity is isolated, again can linearity transmission simulating signal.
Description of drawings:
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment:
Below in conjunction with accompanying drawing the utility model embodiment is described in detail.
As shown in Figure 1, the utility model embodiment comprises two photoelectric coupled circuit, integrating circuit and adding circuit.
Two photoelectric coupled circuit, comprise two optocoupler A, B, IC1 is an opto-coupler chip, model is PC817-2, two optocoupler A, B are encapsulated on the same chip IC 1, can think that the parameter of this two optocoupler A, B is identical, promptly the current conversion COEFFICIENT K of two optocoupler A, B is identical, current conversion COEFFICIENT K=phototriode emitter current I
E/ photodiode current I
D, the current conversion COEFFICIENT K 2 of the current conversion COEFFICIENT K 1=optocoupler B of optocoupler A.
Input voltage Ui is applied to 1,2 pin of the photodiode two ends IC1 of optocoupler A through resistance R 1, and C1 is a filter capacitor, is connected in parallel on 1,2 pin of the photodiode two ends IC1 of optocoupler A.Resistance R is that resistance R 2 and adjustable resistance VR1 are in series, be connected between 3 pin and ground wire of the anodal IC1 of photodiode of optocoupler B, 7,5 pin of the phototriode emitter IC1 of optocoupler A, B connect ground wire through the identical resistance R 3 of resistance, R4 respectively, and 8,6 pin of the phototriode pipe collector IC1 of optocoupler A, B all connect power supply VCC.
Integrating circuit; comprise an operational amplifier IC2; capacitor C 2 is connected across between 1 pin of 2 pin of negative input end IC2 of operational amplifier IC2 and output terminal IC2; 2 pin of the negative input end IC2 of operational amplifier IC2 connect 7 pin of the phototriode emitter IC1 of optocoupler A; 3 pin of positive input terminal IC2 connect 5 pin of the phototriode emitter IC1 of optocoupler B; the diode D1 that connects reverse parallel connection between 2 pin of the negative input end IC2 of operational amplifier IC2 and 3 pin of positive input terminal IC2; D2; diode D1; D2 is as clamps; during circuit working with 2 of operational amplifier IC2; voltage clamp between 3 pin is within 0.6V, and IC2 plays a protective role to operational amplifier.1 pin of the output terminal IC2 of operational amplifier IC2 connects 4 pin of the photodiode negative pole IC1 of optocoupler B.
Adding circuit, comprise an operational amplifier IC3, resistance R 5 and adjustable resistance VR2 series connection, be connected between power supply VCC and the ground wire, the tie point b of resistance R 5 and adjustable resistance VR2 is through 2 pin of the negative input end IC3 of resistance R 6 concatenation operation amplifier IC3,1 pin of the output terminal IC2 of operational amplifier IC2 is through 2 pin of the negative input end IC3 of resistance R 7 also concatenation operation amplifier IC3,3 pin of the positive input terminal IC3 of operational amplifier IC3 connect ground wire through resistance R 8, resistance R 9 is connected across between 1 pin of 2 pin of negative input end IC3 of operational amplifier IC3 and output terminal IC3, the 1 pin output voltage U 3 of the output terminal IC3 of operational amplifier IC3.In the circuit, resistance R 6, R7, R9 resistance are identical, and the resistance of resistance R 8 is the parallel connection value of resistance R 6, R7, R9 resistance, and the resistance of resistance R 8 can be zero also, and at this moment, 3 pin of the positive input terminal IC3 of operational amplifier IC3 directly connect ground wire.
In Fig. 1, input voltage Ui again through IC2, behind the IC3 operational amplifier, exports U3 through light-coupled isolation, and U3=Ui* (R2+VR1)/R1.Concrete principle of work is as follows:
After circuit input end added voltage U i, optocoupler A flow through electric current I
D1,
I
D1＝(Ui-U
D1)/R1?------------------------------------(1)；
Corresponding with it simultaneously optocoupler triode becomes conducting, its conducting electric current by ending
I
E1＝I
D1*K1?-----------------------------------------(2)；
On R3, produce pressure drop U simultaneously
R3(U
R3〉=0), this moment U
R4Be zero, therefore have electric current to pass through capacitor C 2, flow to 1 pin of IC2 by 2 pin of IC2.Thereby the output terminal of IC2 produces a negative voltage U2.Owing to flow through electric current I in the photodiode that appears at optocoupler B of this negative pressure
D2,
I
D2＝(-U
D2-U2)/(VR1+R2)?-----------------------------(3)
Produce electric current I in the Dui Ying phototriode with it
E2,
I
E2＝K2*I
D2?-----------------------------------------(4)；
So U
R4=R4*K2*I
D2Because IC2 and C2 form integrating circuit, the IC2 output terminal is stabilized in a value U2 the most at last, and according to the principle of work of integrating circuit as can be known, after U2 stablized, the electric current that flows through C2 was 0, just U at this moment
R3=U
R4
U
R3＝R3*K1*I
D1?--------------------------------------(5)；
U
R4＝R4*K2*I
D2?--------------------------------------(6)；
By U
R3=U
R4, can get R3*K1*I
D1=R4*K2*I
D2
Since in this circuit, R3=R4, and therefore K1=K2 can release
I
D1＝I
D2?--------------------------------------------(7)；
By equation (1), (3), (7), can get:
(Ui-U
D1)/R1＝(-U2-U
D2)/(VR1+R2)?---------------------(8)
That is:
Ui/R1-U
D1/R1＝-U
D2/(VR1+R2)-U2/(VR1+R2)?-------------(9)
Can extrapolate:
U2＝-(VR1+R2)*(Ui/R1-U
D1/R1+U
D2/(VR1+R2))
＝-(VR1+R2)*Ui/R1+(VR1+R2)*U
D1/R1-U
D2?-------------(10)
Because U
D1=U
D2So,
U2＝-(VR1+R2)*Ui/R1+(R2+VR1-R1)*U
D1/R1?--------------(11)
R6=R7=R9 in circuit, establishing the voltage that b orders is Ub,
U3=-(Ub/R6+U2/R7) xR9 then
＝-Ub-U2?----------------------------------------(12)
Get by equation (11), (12):
U3＝(VR1+R2)*Ui/R1-(R2+VR1-R1)*U
D1/R1-Ub?------------(13)
VR2 in the adjustment circuit just can change the size of Ub.We make in circuit
Ub＝(R1-R2-VR1)*U
D1/R1?------------------------------(14)
Then can release by equation (13), (14)
U3＝(VR1+R2)*Ui/R1＝K3*Ui?---------------------------(15)
K3=(VR1+R2)/R1---------------------------------(16) wherein
Therefore foregoing circuit can linearly transmit simulating signal, do not have getting in touch of electricity between IC2 and back-end circuit thereof and input circuit R1, the C1 in circuit, so circuit has been realized electric isolation by IC1.
Why selecting adjustable resistance VR1 for use, is for the ease of obtaining different scale-up factor K3, to adapt to the needs of different circuit.
Claims (9)
1. a photoelectricity is isolated linear quantizer, it is characterized in that: comprising:
Two photoelectric coupled circuit, comprise two optocoupler A, B that parameter is identical, input voltage Ui is applied to the photodiode two ends (IC1 1,2) of optocoupler A through resistance R 1, resistance R is connected between the photodiode positive pole (IC1 3) and ground wire of optocoupler B, the phototriode emitter of optocoupler A, B (IC1 7,5) connects ground wire through the identical resistance R 3 of resistance, R4 respectively, and the phototriode pipe collector of optocoupler A, B (IC1 8,6) all connects power supply VCC;
Integrating circuit, comprise an operational amplifier IC2, capacitor C 2 is connected across between the negative input end (IC2 2) of operational amplifier IC2 and the output terminal (IC2 1), the negative input end of operational amplifier IC2 (IC2 2) connects the phototriode emitter (IC1 7) of optocoupler A, positive input terminal (IC2 3) connects the phototriode emitter (IC1 5) of optocoupler B, and output terminal (IC2 1) connects the photodiode negative pole (IC1 4) of optocoupler B;
Adding circuit, comprise an operational amplifier IC3, resistance R 5 and adjustable resistance VR2 series connection, be connected between power supply VCC and the ground wire, the tie point of resistance R 5 and adjustable resistance VR2 (b) is through the negative input end of resistance R 6 concatenation operation amplifier IC3 (IC3 2), the output terminal of operational amplifier IC2 (IC2 1) is through the resistance R 7 also negative input end of concatenation operation amplifier IC3 (IC3 2), the positive input terminal of operational amplifier IC3 (IC3 3) connects ground wires through resistance R 8, resistance R 9 is connected across between the negative input end (IC3 2) of operational amplifier IC3 and the output terminal (IC3 1), the output terminal of operational amplifier IC3 (IC3 1) output voltage U 3.
2. photoelectricity according to claim 1 is isolated linear quantizer, and it is characterized in that: the resistance of described resistance R 6, R7, R9 is identical.
3. photoelectricity according to claim 1 and 2 is isolated linear quantizer, and it is characterized in that: the resistance of described resistance R 8 is the parallel connection value of resistance R 6, R7, R9 resistance.
4. photoelectricity according to claim 1 and 2 is isolated linear quantizer, it is characterized in that: the resistance of described resistance R 8 is zero.
5. photoelectricity according to claim 1 is isolated linear quantizer, and it is characterized in that: described resistance R is that resistance R 2 and adjustable resistance VR1 are in series.
6. photoelectricity according to claim 1 is isolated linear quantizer, it is characterized in that: the photodiode two ends of described optocoupler A (IC1 1,2) filter capacitor C1 in parallel.
7. photoelectricity according to claim 1 is isolated linear quantizer, it is characterized in that: diode D1, the D2 of connection reverse parallel connection between the negative input end of described operational amplifier IC2 (IC2 2) and the positive input terminal (IC2 3).
8. photoelectricity according to claim 1 is isolated linear quantizer, and it is characterized in that: described optocoupler A, B are encapsulated on the same opto-coupler chip IC1.
9. photoelectricity according to claim 8 is isolated linear quantizer, and it is characterized in that: the model of described opto-coupler chip IC1 is PC817-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200264191U CN201654996U (en) | 2010-01-08 | 2010-01-08 | Photoelectric isolation linear transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200264191U CN201654996U (en) | 2010-01-08 | 2010-01-08 | Photoelectric isolation linear transducer |
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|---|---|
| CN201654996U true CN201654996U (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200264191U Expired - Fee Related CN201654996U (en) | 2010-01-08 | 2010-01-08 | Photoelectric isolation linear transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907728A (en) * | 2017-10-11 | 2018-04-13 | 深圳供电局有限公司 | Linear photoelectric isolation circuit for inhibiting temperature drift |
| CN109120254A (en) * | 2018-10-09 | 2019-01-01 | 华北电力大学（保定） | A kind of switching value input circuit |
-
2010
- 2010-01-08 CN CN2010200264191U patent/CN201654996U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907728A (en) * | 2017-10-11 | 2018-04-13 | 深圳供电局有限公司 | Linear photoelectric isolation circuit for inhibiting temperature drift |
| CN107907728B (en) * | 2017-10-11 | 2020-04-24 | 深圳供电局有限公司 | Linear photoelectric isolation circuit for inhibiting temperature drift |
| CN109120254A (en) * | 2018-10-09 | 2019-01-01 | 华北电力大学（保定） | A kind of switching value input circuit |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU YOUTIAN MECHANICAL AND ELECTRICAL EQUIPM Free format text: FORMER OWNER: GUANGZHOU CH CONTROL TECHNOLOGY CO., LTD. Effective date: 20110510 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 510070 ZHONGHAO COMPANY, BUILDING 15, YARD 100, XIANLIE MIDDLE ROAD, GUANGZHOU CITY, GUANGDONG PROVINCE TO: 510663 NO. 11, NANXIANG ROAD, SCIENCE CITY, HIGH-TECH. INDUSTRIAL DEVELOPMENT AREA, GUANGZHOU, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110510 Address after: 510663 Guangdong province high tech Industrial Development Zone of Guangzhou Science City Nanxiang Road No. 11 Patentee after: Guangzhou WeldKing Electric Inc. Address before: 510070 15 Zhong Zhong Road, No. 100, martyrs Middle Road, Guangdong, Guangzhou Patentee before: Guangzhou C.H Control Technology Co., Ltd. |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151208 Address after: Baiyun District of Guangzhou City, Guangdong province 510000 Zhongluotan town center Hongqi Street No. 59 Patentee after: Guangzhou Han Electrical Machinery Co. Ltd. Address before: 510663 Guangdong province high tech Industrial Development Zone of Guangzhou Science City Nanxiang Road No. 11 Patentee before: Guangzhou WeldKing Electric Inc. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20170515 Address after: 511356 Guangdong city of Guangzhou province Luogang District huangqishan Road No. 11 on the third floor (Rostone building) Patentee after: Guangzhou King Welding Mechanical & Electrical Equipment Co., Ltd. Address before: Baiyun District of Guangzhou City, Guangdong province 510000 Zhongluotan town center Hongqi Street No. 59 Patentee before: Guangzhou Han Electrical Machinery Co. Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20190108 |
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| CF01 | Termination of patent right due to non-payment of annual fee |