CN2938119Y - Photoelectric coupling AC voltage separation measuring circuit - Google Patents
Photoelectric coupling AC voltage separation measuring circuit Download PDFInfo
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- CN2938119Y CN2938119Y CN 200620044633 CN200620044633U CN2938119Y CN 2938119 Y CN2938119 Y CN 2938119Y CN 200620044633 CN200620044633 CN 200620044633 CN 200620044633 U CN200620044633 U CN 200620044633U CN 2938119 Y CN2938119 Y CN 2938119Y
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- photoelectrical coupler
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- photoelectric coupling
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Abstract
The utility model relates to a photoelectric coupling AC voltage isolation measurement circuit, comprising an alternating current signal voltage, a voltage reducing resistance R1, an amplitude limit protection diode D at the input terminal, a photocoupler U1, a filter capacitor C at the output terminal. The utility model is characterized in that it in addition comprises a signal feedback channel which consists of a photocoupler U2, a resistance R2 and a resistance R3. Owing to the two photocouplers having the same temperature characteristics, when another photocoupler with the same specification is used to feed back the photoelectric isolation signal, the temperature shifts counteract each other to a large margin to deepen the counter feedback properly, so that the effect of temperature can be greatly reduced, thus linearity is strengthened. The circuit is simple and reliable with low cost and very effective and practical in particular in the AC voltage measurement needing separating, such as in circuits like the double power automatic transferring switch controller circuit, etc.
Description
Technical field
The utility model relates to the technical field of alternating voltage isolated measurement circuit, particularly a kind of photoelectric coupling type alternating voltage isolated measurement circuit that has the signal feedback passage.
Background technology
Photoelectrical coupler (hereinafter to be referred as optocoupler) more and more is widely used in electronic technology, and this is because its feature as the transmission of transformer signal, can realize the isolation of front and back when the transmission of signal.Its speed is fast, dielectric strength height, and the direct current signal propagation function that has transformer not have, and this point makes it extremely important.The volume of optocoupler is little, and cost is low, in the small-signal transfer circuit, in the electromechanical integration equipment of strong and weak electricity coexistence, in having the electric equipment of embedded system, optocoupler isolation measurement and anti-interference aspect play an important role.Especially in digital quantity and switching value transmission, simple and reliable, ripe day by day.But in analog quantity is transmitted,, be subject to the influence of environment temperature owing to the characteristic of semiconductor of optocoupler, cause certain non-linear sum of errors drift, so in use, the serviceability temperature compensation that has, also there is the operational amplifier of cooperation to do non-linear rectification, but general temperature compensation low precision has increased non-linear error sometimes on the contrary, and uses the temperature drift that amplifier can not effectively solve optocoupler, and the compensation that the both takes into account, often complex circuit has not only increased cost, and has reduced reliability.In high voltage signal was measured and handled, the isolation transmission of utilization optocoupler can solve temperature drift and gamma correction again simply, satisfies the requirement of certain precision, not less than being a kind of simple and practical and scheme that cost performance is good.In the existing optocoupler signal transfering circuit, have only photoelectrical coupler to transmit signal, as semiconductor devices, the variation of environment temperature in use makes the signal of transmission produce drift to cause general alternating voltage isolation measurement to produce bigger error.
Figure 1 shows that existing general photoelectric coupler isolation alternating current voltage measuring circuit, owing to do not have photoelectricity isolation signals negative feedback loop, so along with variation of temperature, photoelectrical coupler temperature occurs and wafts.
Figure 2 shows that existing being generally makes the operational amplifier emphasizer circuit that has the better linearity degree and adopt.The caused temperature of photoelectrical coupler is waftd and is not improved, and many one road power supplys of AC side make the circuit relative complex.
The utility model content
The purpose of this utility model is to provide a kind of photoelectric coupling type alternating voltage isolated measurement circuit that has negative feedback channel, make the temperature drift problem and the linearity be greatly improved, solved the temperature drift that existing photoelectrical coupler occurs and the problem of poor linearity in signal transduction process.
In order to realize above purpose; the utility model provides a kind of photoelectric coupling type alternating voltage isolated measurement circuit; the AC signal dropping resistor R1, the limited amplitude protection diode D that comprise input end; photoelectrical coupler U1; the filter capacitor C of output terminal; it is characterized in that: also comprise the signal feedback passage, described signal feedback passage is made up of photoelectrical coupler U2 and resistance R 2, R3.
Input signal is connected with input end pin 1, the pin 2 of photoelectrical coupler U1 through AC signal dropping resistor R1 and limited amplitude protection diode D; the pin 1 of photoelectrical coupler U1 is connected with the pin 4 of photoelectrical coupler U2 through feedback input signal shunt resistance R2; the pin 2 of photoelectrical coupler U1 is connected with the pin 3 of photoelectrical coupler U2; the pin 4 of photoelectrical coupler U1 meets DC control supply VCC; output signal sampling and signal feedback resistance R 3 are connected between the pin 1 of the pin 3 of photoelectrical coupler U1 and photoelectrical coupler U2, pin 2 ground connection of photoelectrical coupler U2.
Described photoelectrical coupler U1 and photoelectrical coupler U2 can be unit package, also can be two unit package, also can be a plurality of unit package according to the circuit needs.
Described AC signal dropping resistor R1 can be any fixed resistance or variable resistor that satisfies power consumption and requirement of withstand voltage, and its resistance and power are selected according to the size of alternating voltage.When single resistance power consumption and withstand voltage aspect when reaching requirement, but a plurality of resistance of serial or parallel connection.
Described limited amplitude protection diode D can be any diode that satisfies circuital current and requirement of withstand voltage.
Described resistance R 2, R3 can be fixed resistances, also can be variable resistor (potentiometers), and its resistance can be according to the circuit needs, and depth of feedback needs and adjusts.
Described filter capacitor C can be any electric capacity, can be polar capacitor, also can be polarity free capacitor, and its capacitance is selected according to circuit needs and sampling computing method.
The beneficial effects of the utility model are: the another photoelectrical coupler with same specification carries out the negative feedback of photoelectricity isolation signals, two photoelectrical couplers are because temperature characterisitic is the same, the temperature that is produced is waftd and is cancelled each other to a great extent, suitably deepen negative feedback, make the linearity improve a lot, Temperature Influence reduces widely.Circuit is simple and reliable, and is with low cost, especially in the ac voltage measurement that needs are isolated, such as very effective in the circuit such as double power supply automatic transfer switch controller and practical.
Description of drawings
Fig. 1 does the electrical block diagram of voltage isolation metering circuit for existing general photoelectrical coupler.
Fig. 2 makes the electrical block diagram with operational amplifier emphasizer circuit that the better linearity degree adopts for existing being generally.
Fig. 3 is a structural representation of the present utility model.
Fig. 4 is an a certain controller three-phase alternating voltage signal sampling example circuit structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
A kind of photoelectric coupling type alternating voltage isolated measurement circuit shown in Figure 3; the AC signal dropping resistor R1, the limited amplitude protection diode D that comprise input end; photoelectrical coupler U1; the filter capacitor C of output terminal; it is characterized in that: also comprise the signal feedback passage, described signal feedback passage is made up of photoelectrical coupler U2 and resistance R 2, R3.
Input signal is through the input end pin 1 of AC signal dropping resistor R1 and limited amplitude protection diode D and photoelectrical coupler U1; pin 2 connects; resistance R 2 is a retroactive effect input signal shunt resistance; the pin 1 of photoelectrical coupler U1 is connected with the pin 4 of photoelectrical coupler U2 through resistance R 2; the pin 2 of photoelectrical coupler U1 is connected with the pin 3 of photoelectrical coupler U2; the pin 4 of photoelectrical coupler U1 meets DC control supply VCC; resistance R 3 both had been an output signal sampling resistance; be again signal feedback resistance; be connected between the pin 1 of the pin 3 of photoelectrical coupler U1 and photoelectrical coupler U2; change R2; the size of R3; can change the degree of depth of feedback, pin 2 ground connection of photoelectrical coupler U2.
Wherein photoelectrical coupler U1 and photoelectrical coupler U2 can be unit package, also can be two unit package, also can be a plurality of unit package according to the circuit needs.AC signal dropping resistor R1 can adopt any resistance of full pressure power consumption and requirement of withstand voltage, also can a plurality of resistance serial or parallel connection, and its resistance and power are decided according to the input end light emitting diode working current of alternating voltage size and photoelectrical coupler.Limited amplitude protection diode D shields, and the light emitting diode and the phototriode of protection photoelectrical coupler are not reversed puncture, and it can be any diode that satisfies circuital current and requirement of withstand voltage.Resistance R 2, R3 can be fixed resistances, also can be variable resistor (potentiometers), and its resistance can be according to the circuit needs, and depth of feedback needs and selectes.Filter capacitor C can be any electric capacity, can be polarity free capacitor, also can be electrochemical capacitor, and its capacitance is selected according to circuit needs and sampling computing method, and its value size is decided as required, and is if need do the phase bit comparison, unsuitable excessive.
The present invention carries out the negative feedback of photoelectricity isolation signals with the another photoelectrical coupler of same specification.Two photoelectrical couplers are because temperature characterisitic is the same, and the temperature that is produced is waftd and cancelled each other to a great extent, suitably deepens negative feedback, makes the linearity improve a lot, and Temperature Influence reduces widely.
Fig. 4 is the three-phase voltage sampling example circuit of certain controller, and circuit adopts the photoelectric coupler isolation feedback.
Claims (6)
1, a kind of photoelectric coupling type alternating voltage isolated measurement circuit; the AC signal dropping resistor (R1), the limited amplitude protection diode (D) that comprise input end; photoelectrical coupler (U1); the filter capacitor of output terminal (C); it is characterized in that: also comprise the signal feedback passage, described signal feedback passage is made up of photoelectrical coupler (U2) and resistance (R2), (R3).
2; a kind of photoelectric coupling type alternating voltage isolated measurement circuit according to claim 1; it is characterized in that: input signal is through the input end pin (1) of AC signal dropping resistor (R1) and limited amplitude protection diode (D) and photoelectrical coupler (U1); pin (2) connects; the pin (1) of photoelectrical coupler (U1) is connected with the pin (4) of photoelectrical coupler (U2) through feedback input signal shunt resistance (R2); the pin (2) of photoelectrical coupler (U1) is connected with the pin (3) of photoelectrical coupler (U2); the pin (4) of photoelectrical coupler (U1) connects DC control supply (VCC); output signal sampling and signal feedback resistance (R3) are connected between the pin (1) of the pin (3) of photoelectrical coupler (U1) and photoelectrical coupler (U2), pin (2) ground connection of photoelectrical coupler (U2).
3, a kind of photoelectric coupling type alternating voltage isolated measurement circuit according to claim 1 and 2, it is characterized in that: described photoelectrical coupler (U1) and photoelectrical coupler (U2) are a unit package or two unit package.
4, a kind of photoelectric coupling type alternating voltage isolated measurement circuit according to claim 1 and 2, it is characterized in that: described AC signal dropping resistor (R1) is fixed resistance or variable resistor.
5, a kind of photoelectric coupling type alternating voltage isolated measurement circuit according to claim 1 and 2, it is characterized in that: described resistance (R2), (R3) are fixed resistance or variable resistor.
6, a kind of photoelectric coupling type alternating voltage isolated measurement circuit according to claim 1 and 2, it is characterized in that: described filter capacitor (C) is polarity free capacitor or polar capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620044633 CN2938119Y (en) | 2006-08-08 | 2006-08-08 | Photoelectric coupling AC voltage separation measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620044633 CN2938119Y (en) | 2006-08-08 | 2006-08-08 | Photoelectric coupling AC voltage separation measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2938119Y true CN2938119Y (en) | 2007-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620044633 Expired - Fee Related CN2938119Y (en) | 2006-08-08 | 2006-08-08 | Photoelectric coupling AC voltage separation measuring circuit |
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| CN (1) | CN2938119Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104319A (en) * | 2011-04-01 | 2011-06-22 | 欧瑞传动电气有限公司 | IGBT drive circuit and control method |
| CN102062799B (en) * | 2009-11-18 | 2012-09-12 | 中国北车集团大连机车研究所有限公司 | Vehicle mounted electrical isolation measuring circuit |
| CN103364613A (en) * | 2013-07-15 | 2013-10-23 | 长城电器集团有限公司 | Voltage signal conditioning circuit of automatic reclosing lock breaker in time of electric leakage |
| CN104049125A (en) * | 2013-03-12 | 2014-09-17 | 浙江海洋学院 | Linear voltage detection method based on photoelectric couplers |
| CN104569554A (en) * | 2015-01-28 | 2015-04-29 | 长城电器集团有限公司 | Double-power-supply voltage detection circuit |
| CN106796254A (en) * | 2014-08-22 | 2017-05-31 | 伊顿保护系统Ip有限两合公司 | Supply voltage detection device and the method for detecting supply voltage |
| CN107907728A (en) * | 2017-10-11 | 2018-04-13 | 深圳供电局有限公司 | A kind of linear photoelectric isolation circuit for suppressing temperature drift |
| 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 |
| CN109669503A (en) * | 2018-12-13 | 2019-04-23 | 朱嘉慧 | Isolated amplifier and its controlled ratio source and integral controlled source and mutual coupling device |
| CN111060767A (en) * | 2019-12-28 | 2020-04-24 | 广东盈科电子有限公司 | ATE tester |
-
2006
- 2006-08-08 CN CN 200620044633 patent/CN2938119Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062799B (en) * | 2009-11-18 | 2012-09-12 | 中国北车集团大连机车研究所有限公司 | Vehicle mounted electrical isolation measuring circuit |
| CN102104319A (en) * | 2011-04-01 | 2011-06-22 | 欧瑞传动电气有限公司 | IGBT drive circuit and control method |
| CN104049125A (en) * | 2013-03-12 | 2014-09-17 | 浙江海洋学院 | Linear voltage detection method based on photoelectric couplers |
| CN103364613A (en) * | 2013-07-15 | 2013-10-23 | 长城电器集团有限公司 | Voltage signal conditioning circuit of automatic reclosing lock breaker in time of electric leakage |
| CN106796254B (en) * | 2014-08-22 | 2024-02-02 | 伊顿智能动力有限公司 | Supply voltage detection device and method for detecting a supply voltage |
| CN106796254A (en) * | 2014-08-22 | 2017-05-31 | 伊顿保护系统Ip有限两合公司 | Supply voltage detection device and the method for detecting supply voltage |
| CN104569554A (en) * | 2015-01-28 | 2015-04-29 | 长城电器集团有限公司 | Double-power-supply voltage detection circuit |
| CN107907728A (en) * | 2017-10-11 | 2018-04-13 | 深圳供电局有限公司 | A kind of linear photoelectric isolation circuit for suppressing 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 |
| CN109669503A (en) * | 2018-12-13 | 2019-04-23 | 朱嘉慧 | Isolated amplifier and its controlled ratio source and integral controlled source and mutual coupling device |
| 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 |
| 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 |
| CN111060767A (en) * | 2019-12-28 | 2020-04-24 | 广东盈科电子有限公司 | ATE tester |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |