CN201549065U - Linear photoelectric isolator with passive input - Google Patents
Linear photoelectric isolator with passive input Download PDFInfo
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- CN201549065U CN201549065U CN2009202435286U CN200920243528U CN201549065U CN 201549065 U CN201549065 U CN 201549065U CN 2009202435286 U CN2009202435286 U CN 2009202435286U CN 200920243528 U CN200920243528 U CN 200920243528U CN 201549065 U CN201549065 U CN 201549065U
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Abstract
The utility model discloses a linear photoelectric isolator with passive input which comprises an input part and an output part, wherein the input part is composed of a sampling resistance, a voltage-stabilizing component, a signal amplifier, a linear photoelectric isolation element and the like. The linear photoelectric isolator fully utilizes the high voltage resistance characteristic of the linear photoelectric isolation element, and does not need supply with an extra auxiliary power supply for an input end, thereby avoiding the interferences of the auxiliary power supply to the isolator, and reducing the fault points, simultaneously, input and output signals of the isolator are high in frequency response, strong in load carrying capacity and high in isolation voltage resistance. When in use, the isolator can output different current or voltage isolation signals only by connecting into 2-40 mA direct current at the input end, can widely satisfy various industrial control requirements, and is completely suitable for the mostly-common 4-20 mA current transmission modes.
Description
Technical field
The utility model relates to a kind of input and output to instrument and meter, sensor transmissions and conversion, control system, power equipment and Medical Instruments and carries out the linear photoconductor isolator that safety is isolated.
Background technology
Industrially generally need to measure all kinds of non-electric physical quantitys, for example temperature, pressure, speed, angle etc., but in circuit transfers, non-electric physical quantity must be converted to the electric signal analog quantity and just can be transferred on hundreds of the rice outer pulpit or display device, adopt isolator that Signal Separation is arrived the ground of control system or the ground of measuring system again; Make between sensor, instrument or control system and the power supply and isolate mutually, stably work to guarantee total system safety, reliable reaching.Industrial the most extensive employing be to come the transportation simulator amount with 4～20mA electric current, following two kinds of transmission modes are specifically arranged:
A kind of is to adopt the magnetic isolation method to isolate, and its weak point is that the input and output signal frequency response is slow, carrying load ability is poor, it is withstand voltage low to isolate.
Another kind is to adopt active linear photoelectricity isolation method to isolate, its weak point is, it need give the power supply respectively of input and output part, and power supply produces the importation of isolator easily and disturbs, thereby influence the performance of isolator, and it is withstand voltage to reduce its isolation.
Summary of the invention
In order to solve the prior art above shortcomings, the utility model proposes a kind of passive linear photoconductor isolator of importing, it is divided into input and output two parts, its importation is by sample resistance, the voltage stabilizing components and parts, compositions such as signal amplifier and linear photoconductor isolated component, it has made full use of the high voltage endurance of linear photoconductor isolated component itself, not needing again provides extra accessory power supply to input end, thereby the interference of having avoided accessory power supply that isolator is caused, reduced the trouble spot, input and output signal frequency response of the present utility model simultaneously is fast, carrying load ability is strong, isolate withstand voltage height.During use, only need to insert the DC current of 2-40mA, just can export different curtage isolation signals, extensively satisfy various Industry Control needs, be applicable to industrial the most frequently used 4～20mA current delivery mode fully at input end of the present utility model.
The utility model solves its technical matters, the technical scheme that is adopted is: a kind ofly import passive linear photoconductor isolator, it is divided into input and output two parts, its importation is by sample resistance, the voltage stabilizing components and parts, compositions such as signal amplifier and linear photoconductor isolated component, its design feature is: the anode in the importation connects voltage stabilizing diode and voltage-reference, power to voltage-reference by this voltage stabilizing diode, this voltage-reference connects precision photoelectric coupler and operational amplifier again respectively, voltage-reference is given the power supply of precision photoelectric coupler and operational amplifier simultaneously, be not more than 10 ohm sample resistance in the negative terminal of importation two resistances in parallel, the integrating circuit that the sampled signal that sample resistance produces is formed by operational amplifier and electric capacity is controlled the size of triode on resistance, adjust the 1st of linear optical coupling by the triode on resistance size, the transmitter current of 2 pin, this transmitter current is by the 3rd of linear optical coupling the, 4 pin and the 5th, 6 pin receive by corresponding proportion simultaneously and amplify, the 3rd of linear optical coupling, 4 pin concatenation operation amplifiers, the 3rd of this linear optical coupling, the current closed-loop that 4 pin receive feeds back to operational amplifier, with the 1st of constant linear optocoupler, the transmitter current of 2 pin; The 5th, 6 pin of linear optical coupling connect resistance, electric capacity and the operational amplifier of output, constitute the current amplification circuit of output terminal.
The linear photoconductor isolator that above-mentioned input is passive, accessory power supply is not used in its importation.
Compared with prior art, the beneficial effects of the utility model are: because the utility model is connected with voltage stabilizing diode and voltage-reference IC1 at input end, can be always subsequent conditioning circuit reference voltage is provided, this circuit has substituted prior art at the extra accessory power supply that adopts of input end, thereby has realized the input passive structures.The sample resistance of two parallel connections of the utility model setting all adopts low resistance resistance, and the resistance of two resistance all is not more than 10 ohm, has effectively reduced the undesired signal in the circuit, and its sampling precision is higher, and the scope of application is wider, and energy consumption is lower simultaneously.The electric current that 3,4 pin of the utility model linear optical coupling IC2 receive can close-loop feedback arrive operational amplifier, its beneficial effect be can be all the time the transmitter current of 1,2 pin of constant linear optocoupler IC2 fast, thereby accelerated the response time of linear optical coupling, improved the stability of output current and the linearity of I/O, the utility model can be controlled at the FR Linearity of I/O in 2/1000ths.Simultaneously, because precision photoelectric coupler of the present utility model does not need to connect extraneous auxiliary input power supply, the isolation that can give full play to linear photoconductor isolated component self is withstand voltage, and it is isolated withstand voltage properties and is improved largely than prior art.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, first kind of embodiment of the present utility model is: a kind ofly import passive linear photoconductor isolator, it is divided into input INPUT and output OUTPUT two parts, between the anode I+ of importation INPUT and I-, connect two Transient Suppression Diode D1, to prevent the input current transition; Anode I+ connects voltage stabilizing diode D2 and voltage-reference IC1, give voltage-reference IC1 power supply by voltage stabilizing diode D2, voltage-reference IC1 connects precision photoelectric coupler IC2 and operational amplifier IC3 again respectively, voltage-reference IC1 gives precision photoelectric coupler IC2 and operational amplifier IC3 power supply simultaneously, negative terminal I-at importation INPUT connects sample resistance R5 and R6, sample resistance R5 and R6 parallel connection, the resistance of R5 and R6 is 10 ohm, sample resistance R5 is connected resistance R 4 respectively with R6 two, R7, sampled signal is controlled the size of triode VT1 conducting resistance by the integrating circuit of operational amplifier IC3 and capacitor C 5 compositions, adjust 1 of linear optical coupling IC2 by triode VT1 conducting resistance size, the transmitter current of 2 pin, this transmitter current is by 3 of linear optical coupling IC2,4 pin and 5,6 pin receive by corresponding proportion simultaneously and amplify, 3 of linear optical coupling IC2,4 pin concatenation operation amplifier IC3,3 of this linear optical coupling IC2, the current closed-loop that 4 pin receive feeds back to operational amplifier IC3, with 1 of constant linear optocoupler IC2, the transmitter current of 2 pin.
At output OUTPUT: provide stable accessory power supply+24VDC by the user, through electrochemical capacitor C3, capacitor C 2 filtering, be operational amplifier IC4 and voltage commentaries on classics current module U1 power supply, 5,6 pin of linear optical coupling IC2 connect resistance R 2, capacitor C 4, the operational amplifier IC4 of output OUTPUT, constitute the current amplification circuit of output terminal.Enlargement factor is by the resistance size decision of resistance R 2; Resistance R 3 and potentiometer RP1 are connected voltage commentaries on classics current module U1 after forming dividing potential drop, output signal can be adjusted into required voltage or current signal arbitrarily.Such as the output that realizes voltage 0-10V or electric current 2-40mA scope.
Because the utility model adopts input dc power stream 2-40mA, does not need accessory power supply, this isolation of just having given full play to linear photoconductor isolated component self is withstand voltage, and isolation is withstand voltage between the signal I/O can reach 5kV rms/1 min Rating; The response speed that signal is input to output can reach 20kHz; The input sample resistance is not more than 10 ohm; This isolator accuracy class has: 0.1 grade, 0.2 grade; The gamut scope linearity is less than 0.2%.
Claims (2)
1. import passive linear photoconductor isolator for one kind, be divided into input and output two parts, its importation is by sample resistance, the voltage stabilizing components and parts, compositions such as signal amplifier and linear photoconductor isolated component, it is characterized in that: the anode of (INPUT) (I+) connects voltage stabilizing diode (D2) and voltage-reference (IC1) in the importation, give voltage-reference (IC1) power supply by voltage stabilizing diode (D2), voltage-reference (IC1) connects precision photoelectric coupler (IC2) and operational amplifier (IC3) again respectively, voltage-reference (IC1) is given the power supply of precision photoelectric coupler (IC2) and operational amplifier (IC3) simultaneously, the negative terminal of (INPUT) (I-) two resistances in parallel all are not more than 10 ohm sample resistance (R5 in the importation, R6), sample resistance (R5, R6) sampled signal of Chan Shenging is controlled the size of triode (VT1) conducting resistance by the integrating circuit of operational amplifier (IC3) and electric capacity (C5) composition, adjust linear optical coupling (IC2) the 1st by triode (VT1) conducting resistance size, the transmitter current of 2 pin, this transmitter current is by the 3rd of linear optical coupling (IC2) the, 4 pin and the 5th, 6 pin receive by corresponding proportion simultaneously and amplify, the 3rd of linear optical coupling (IC2), 4 pin concatenation operation amplifiers (IC3), the 3rd of linear optical coupling (IC2), the current closed-loop that 4 pin receive feeds back to operational amplifier (IC3), with constant linear optocoupler (IC2) the 1st, the transmitter current of 2 pin; The 5th, 6 pin of linear optical coupling (IC2) connect resistance (R2), electric capacity (C4) and the operational amplifier (IC4) of output, constitute the current amplification circuit of output (OUTPUT).
2. a kind of passive linear photoconductor isolator of importing according to claim 1, it is characterized in that: importation (INPUT) do not use accessory power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202435286U CN201549065U (en) | 2009-11-27 | 2009-11-27 | Linear photoelectric isolator with passive input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202435286U CN201549065U (en) | 2009-11-27 | 2009-11-27 | Linear photoelectric isolator with passive input |
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| Publication Number | Publication Date |
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| CN201549065U true CN201549065U (en) | 2010-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202435286U Expired - Fee Related CN201549065U (en) | 2009-11-27 | 2009-11-27 | Linear photoelectric isolator with passive input |
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Cited By (5)
| 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 |
| CN102508094A (en) * | 2011-10-18 | 2012-06-20 | 南京信息职业技术学院 | Lightning arrester leakage current sensor |
| CN102522889A (en) * | 2011-12-12 | 2012-06-27 | 西安福安创意咨询有限责任公司 | Design method of passive linear photoelectric isolation conversion circuit |
| CN102970040A (en) * | 2012-11-14 | 2013-03-13 | 中国船舶重工集团公司第七一九研究所 | Analog-digital isolation and conversion circuit based on linear optical isolation |
| CN108981788A (en) * | 2018-08-03 | 2018-12-11 | 珠海瑞景电子科技有限公司 | A kind of modular sensor circuit |
-
2009
- 2009-11-27 CN CN2009202435286U patent/CN201549065U/en not_active Expired - Fee Related
Cited By (7)
| 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 |
| CN102508094A (en) * | 2011-10-18 | 2012-06-20 | 南京信息职业技术学院 | Lightning arrester leakage current sensor |
| CN102522889A (en) * | 2011-12-12 | 2012-06-27 | 西安福安创意咨询有限责任公司 | Design method of passive linear photoelectric isolation conversion circuit |
| CN102970040A (en) * | 2012-11-14 | 2013-03-13 | 中国船舶重工集团公司第七一九研究所 | Analog-digital isolation and conversion circuit based on linear optical isolation |
| CN102970040B (en) * | 2012-11-14 | 2016-01-06 | 中国船舶重工集团公司第七一九研究所 | Based on the modulus isolation change-over circuit of linear optical isolation |
| CN108981788A (en) * | 2018-08-03 | 2018-12-11 | 珠海瑞景电子科技有限公司 | A kind of modular sensor circuit |
| CN108981788B (en) * | 2018-08-03 | 2021-02-02 | 珠海瑞景电子科技有限公司 | Modular sensor circuit |
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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: 20100811 Termination date: 20151127 |