CN203166981U - Magnetic separation signal transmission circuit - Google Patents
Magnetic separation signal transmission circuit Download PDFInfo
- Publication number
- CN203166981U CN203166981U CN 201320214243 CN201320214243U CN203166981U CN 203166981 U CN203166981 U CN 203166981U CN 201320214243 CN201320214243 CN 201320214243 CN 201320214243 U CN201320214243 U CN 201320214243U CN 203166981 U CN203166981 U CN 203166981U
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- resistance
- input
- signal
- operational amplifier
- magnetic isolation
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Abstract
The utility model discloses a magnetic separation signal transmission circuit, comprising a magnetic separation module, a signal input circuit, a signal input resistor, a bias circuit and a subtraction zeroing circuit, wherein the signal input circuit comprises a first resistor, a first capacitor and a first operational amplifier. One end of the first resistor is connected with one end of the first capacitor and a non-inverting input end of the first operational amplifier. The other end of the first capacitor is connected with an input module signal earth. An inverting input end of the first operational amplifier is connected with an output end and then connected with an input end of the magnetic separation module. The magnetic separation signal transmission circuit is simple in structure, convenient in debugging and low in cost; and when small signal voltage is input, high transmission precision can be obtained.
Description
Technical field
The utility model relates to a kind of magnetic isolation signals transmission circuit.
Background technology
In industrial production, need a large amount of transducers be installed in the production scene, transmitter is monitored the various parameters in the production process, exported analog signals such as corresponding electric current, voltage then by above-mentioned instrument and be sent to instrument control room, backstage, to realize the real-time observing and controlling to on-site producing devices.In the analog signal transmission process, for the electrical safety performance that improves system, reduce interfering with each other between the instrument, must isolate the transmission signal.It is the magnetic isolation method of core parts that present widely used analog signal isolation transmission method adopts usually with the transformer.Have flexible design, precision height, power consumption and the low advantage of cost because magnetic is isolated transmission technology, make that this technology has obtained using widely.But when transformer was imported at small-signal, the signal transmission had nonlinear characteristic, namely when small-signal transmits, can produce bigger trueness error between the input signal of magnetic isolation module and the output signal, had influenced this The Application of Technology.
The utility model content
When the purpose of this utility model is to provide a kind of small-signal to transmit, can obtain the magnetic isolation signals transmission circuit of higher transmission precision.
For achieving the above object, the utility model has adopted following technical scheme:
A kind of magnetic isolation signals transmission circuit, comprise magnetic isolation module and signal input circuit, described signal input circuit comprises the first resistance, the first electric capacity and the first operational amplifier, described the first resistance one end and described the first electric capacity one end be connected the first operational amplifier in-phase input end and be connected, another termination input module signal ground of described the first electric capacity, described the first operational amplifier inverting input be connected with described magnetic isolation module input again after the first operational amplifier output terminal is connected, it also comprises
Signal input resistance, described signal input resistance one end are magnetic isolation signals transmission circuit signal input part,
Biasing circuit, comprise second resistance and the 3rd resistance, described second resistance, one termination input module reference voltage, described the 3rd resistance one termination input module signal ground, the described second resistance other end is connected with the described signal input resistance other end with described the 3rd resistance other end, the described first resistance other end
The subtraction zeroing circuit, comprise second operational amplifier, the 4th resistance, the 5th resistance and first potentiometer, the described second operational amplifier in-phase input end is connected with described magnetic isolation module output, inverting input is connected with described the 5th resistance one end with described the 4th resistance one end respectively, described the 5th resistance other end is connected with described potentiometer sliding end, described potentiometer one is termination output module reference voltage fixedly, another is termination output module signal ground fixedly, described the 4th resistance other end and described second operational amplifier output terminal connect into node, and this node is magnetic isolation signals transmission circuit signal output part.
Preferably, described the 4th resistance is identical with the resistance value of described the 5th resistance.
When voltage signal was imported, the offset signal of this input signal and second resistance and the output of the 3rd electric resistance partial pressure superposeed, through being sent to magnetic isolation module input after signal input circuit active power filtering, the impedance conversion; Magnetic isolation module output output isolation voltage signal to the second operational amplifier in-phase input end, output voltage by the regulator potentiometer sliding end, make the voltage signal equivalence of second operational amplifier output terminal in the voltage signal of signal input circuit, reach the purpose that makes input signal and the same value of output signal, thereby realized the transmission course of voltage signal in the linear transfer district of transformer.
Wherein, the magnetic isolation module is core parts with the signal isolating transformer; The dividing potential drop of biasing circuit by second resistance and the 3rd resistance acts on signal input part and preset a bias voltage input signal (its magnitude of voltage is about input signal peaked about 10%).
Compared with prior art, the beneficial effects of the utility model are: simple in structure, debugging is convenient and cost is low; When the input small signal, can access higher transmission precision.
Description of drawings
Fig. 1 is the circuit diagram of magnetic isolation signals transmission circuit in the utility model one preferred embodiment.
Embodiment
Consult Fig. 1, this magnetic isolation signals transmission circuit comprises magnetic isolation module U, first resistance R, 1, the second resistance R 2, the 3rd resistance R 3, the four resistance R 4, the five resistance R 5, signal input resistance R6, potentiometer RV, first capacitor C, 1, the first operational amplifier A 1 and second operational amplifier A 2;
First resistance R, 1 one ends are connected with first operational amplifier A, 1 in-phase input end with first capacitor C, 1 one ends, first capacitor C, 1 another termination input module signal ground GNDP, first operational amplifier A, 1 inverting input be connected with magnetic isolation module U input again after output is connected, second resistance R, 2 one termination input module reference voltage Vref P, the 3rd resistance R 3 one termination input module signal ground GNDP, second resistance R, 2 other ends and the 3rd resistance R 3 other ends, first resistance R, 1 other end is connected with the signal input resistance R6 other end, second operational amplifier A, 2 in-phase input ends are connected with magnetic isolation module U output, inverting input is connected with the 5th resistance R 5 one ends with the 4th resistance R 4 one ends respectively, the 5th resistance R 5 other ends are connected with potentiometer RV sliding end, potentiometer RV one is termination output module reference voltage Vref S fixedly, another is termination output module signal ground GNDS fixedly, the 4th resistance R 4 other ends and second operational amplifier A, 2 outputs connect into node, this node is magnetic isolation signals transmission circuit signal output part, and signal input resistance R6 one end is magnetic isolation signals transmission circuit signal input part;
Wherein the 4th resistance R 4 is identical with the resistance of the 5th resistance R 5.
When voltage signal Vin imported, the offset signal of this input signal Vin and second resistance R 2 and the output of the 3rd resistance R 3 dividing potential drops superposeed, through being sent to magnetic isolation module U input after signal input circuit active power filtering, the impedance conversion; Magnetic isolation module U output output isolation voltage signal to the second operational amplifier A 2 in-phase input ends, output voltage by regulator potentiometer RV sliding end, make the voltage signal equivalence of second operational amplifier A, 2 outputs in the voltage signal of signal input circuit, reach the purpose that makes input signal Vin and the same value of output signal Vout, thereby realized the transmission course of voltage signal in the linear transfer district of transformer.
Wherein, magnetic isolation module U is core parts with signal isolating transformer T1; The dividing potential drop of biasing circuit by second resistance R 2 and the 3rd resistance R 3 acts on signal input part and preset a bias voltage input signal (its magnitude of voltage is about input signal peaked about 10%).
Below only be concrete exemplary applications of the present utility model, protection range of the present utility model is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the utility model rights protection scope.
Claims (2)
1. magnetic isolation signals transmission circuit, comprise magnetic isolation module and signal input circuit, described signal input circuit comprises the first resistance, the first electric capacity and the first operational amplifier, described the first resistance one end and described the first electric capacity one end be connected the first operational amplifier in-phase input end and be connected, another termination input module signal ground of described the first electric capacity, described the first operational amplifier inverting input be connected with described magnetic isolation module input again after the first operational amplifier output terminal is connected, it is characterized in that, it also comprises
Signal input resistance, described signal input resistance one end are magnetic isolation signals transmission circuit signal input part,
Biasing circuit, comprise second resistance and the 3rd resistance, described second resistance, one termination input module reference voltage, described the 3rd resistance one termination input module signal ground, the described second resistance other end is connected with the described signal input resistance other end with described the 3rd resistance other end, the described first resistance other end
The subtraction zeroing circuit, comprise second operational amplifier, the 4th resistance, the 5th resistance and first potentiometer, the described second operational amplifier in-phase input end is connected with described magnetic isolation module output, inverting input is connected with described the 5th resistance one end with described the 4th resistance one end respectively, described the 5th resistance other end is connected with described potentiometer sliding end, described potentiometer one is termination output module reference voltage fixedly, another is termination output module signal ground fixedly, described the 4th resistance other end and described second operational amplifier output terminal connect into node, and this node is magnetic isolation signals transmission circuit signal output part.
2. magnetic isolation signals transmission circuit according to claim 1 is characterized in that, described the 4th resistance is identical with the resistance value of described the 5th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214243 CN203166981U (en) | 2013-04-24 | 2013-04-24 | Magnetic separation signal transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214243 CN203166981U (en) | 2013-04-24 | 2013-04-24 | Magnetic separation signal transmission circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166981U true CN203166981U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320214243 Expired - Lifetime CN203166981U (en) | 2013-04-24 | 2013-04-24 | Magnetic separation signal transmission circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203166981U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373374A (en) * | 2016-11-28 | 2017-02-01 | 长沙广义变流技术有限公司 | Small signal isolation transmission circuit |
| CN107943164A (en) * | 2017-10-26 | 2018-04-20 | 江苏加华枫泰数据网络设备有限公司 | A kind of outdoor communication equipment room power-economizing method |
| CN110061701A (en) * | 2019-04-24 | 2019-07-26 | 中国科学院合肥物质科学研究院 | A kind of quick high frequency voltage amplifier |
-
2013
- 2013-04-24 CN CN 201320214243 patent/CN203166981U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373374A (en) * | 2016-11-28 | 2017-02-01 | 长沙广义变流技术有限公司 | Small signal isolation transmission circuit |
| CN107943164A (en) * | 2017-10-26 | 2018-04-20 | 江苏加华枫泰数据网络设备有限公司 | A kind of outdoor communication equipment room power-economizing method |
| CN110061701A (en) * | 2019-04-24 | 2019-07-26 | 中国科学院合肥物质科学研究院 | A kind of quick high frequency voltage amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
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| CX01 | Expiry of patent term |