CN102262174A - Voltage sensor - Google Patents
Voltage sensor Download PDFInfo
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- CN102262174A CN102262174A CN2011101097602A CN201110109760A CN102262174A CN 102262174 A CN102262174 A CN 102262174A CN 2011101097602 A CN2011101097602 A CN 2011101097602A CN 201110109760 A CN201110109760 A CN 201110109760A CN 102262174 A CN102262174 A CN 102262174A
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- voltage
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- operational amplifier
- amplifier
- voltage sensor
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Abstract
The invention discloses a voltage sensor low in zero drift and high in response speed. The voltage sensor is provided with resistors R1, R2 and R3, which are connected in series with a primary voltage end. One end of the resistor R2 is connected to the positive input end of an operational amplifier IC1, while the other end of the resistor R2 is connected to the negative input end of the operational amplifier IC1. Besides, the output of the operational amplifier IC1 is connected to an isolation amplifier IC2, the output of the isolation amplifier IC2 is connected to a voltage/current converting circuit IC3, and the output of the voltage/current converting circuit IC3 serves as a voltage detection end M, wherein a zeroing circuit FH2 is connected between the output end and the negative input end of the voltage/current converting circuit IC3.
Description
Technical field
The present invention relates to a kind of voltage sensor, the voltage sensor that especially a kind of zero point drift is little, response speed is fast.
Background technology
The present voltage sensor that adopts in fields such as wind-powered electricity generation, DC motor driver, storage battery power supply and welder powers, mainly be based on the voltage sensor of isolated amplifier, the voltage signal of any kind of be can measure, direct current, interchange, pulse and complex signal comprised.Require during measurement primary side high voltage end and secondary side detection output signal end are carried out the electricity isolation, the current signal of secondary side output is used for data acquisition, and response speed is fast.But this voltage sensor existing problem is that stability and consistance are bad, especially weather conditions than rugged surroundings in zero point drift big, had a strong impact on the accuracy that system moves, cause system's misoperation easily, even damage equipment.When particularly being applied to wind power system, many places are in more remote area, and on-the-spot running environment is abominable, in case break down, difficult in maintenance.
Summary of the invention
The present invention is in order to solve the above-mentioned technical matters of existing in prior technology, the voltage sensor that a kind of zero point drift is little, response speed is fast to be provided.
Technical solution of the present invention is: a kind of voltage sensor, be provided with the resistance R that is in series 1 of joining with the primary voltage end, R2, R3, one end of resistance R 2 and the positive input terminal of operational amplifier IC1 join, the negative input end of the other end of resistance R 2 and operational amplifier IC1 joins, the output of operational amplifier IC1 and isolated amplifier IC2 join, the output of isolated amplifier IC2 and voltage-current converter circuit IC3 join, voltage-current converter circuit IC3 is output as current detecting end M, it is characterized in that: be connected to zeroing circuit FH2 between the output terminal of described voltage-current converter circuit IC3 and the negative input end.
The present invention can carry out the electricity isolation to primary side high voltage end and secondary side detection output signal end, and it is little to take volume.Increased zeroing circuit simultaneously, but the adjusting offset current at zero point of fast and stable is little to guarantee zero stability and zero point drift, has improved zero stability, can stable operation under-40 ℃ ~+85 ℃ environment; Precision is good, and the overall accuracy in the time of 25 ℃ is 0.7%; The linearity is good＜and 0.1%; High low temperature drift is low; Response time is short,＜13 microseconds; Anti-external interference ability is strong, can measure the voltage signal (comprising direct current, interchange, pulse signal) of any kind of.
Description of drawings
Fig. 1 is the circuit theory diagrams of the embodiment of the invention.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.As shown in Figure 1: the same with prior art, be provided with the resistance R that is in series 1 of joining with the primary voltage end, R2, R3, one end of resistance R 2 and the positive input terminal of operational amplifier IC1 join, the negative input end of the other end of resistance R 2 and operational amplifier IC1 joins, the output of operational amplifier IC1 and isolated amplifier IC2 join, the output of isolated amplifier IC2 and voltage-current converter circuit IC3 join, voltage-current converter circuit IC3 is output as current detecting end M, power supply+Vcc is the side of isolated amplifier IC2 by mu balanced circuit W1, voltage-current converter circuit provides working power, power supply-Vcc is by oscillator IC4, transformer T1 and rectifier Z1 provide working power for the opposite side of operational amplifier IC1 and isolated amplifier IC2, different is is connected to zeroing circuit FH2 between the output terminal of voltage-current converter circuit IC3 and negative input end with prior art, zeroing circuit buyable existing product is by testing definite optimal parameter.
Principle of work:
After primary voltage signal process resistance R 1, R2, R3 current limliting, the dividing potential drop, send into operational amplifier IC1,, send into isolated amplifier IC2 again and isolate amplification, isolate with the electricity that guarantees primary side and secondary side through following amplifying signal.Export the secondary detection current signal at secondary side through voltage-current converter circuit IC3 conversion back then, the secondary detection current signal adds zeroing circuit at output terminal, and feedback regulation offset current at zero point to reduce zero point drift, guarantees zero stability in real time.
Claims (1)
1. voltage sensor, be provided with the resistance R that is in series 1 of joining with the primary voltage end, R2, R3, one end of resistance R 2 and the positive input terminal of operational amplifier IC1 join, the negative input end of the other end of resistance R 2 and operational amplifier IC1 joins, the output of operational amplifier IC1 and isolated amplifier IC2 join, the output of isolated amplifier IC2 and voltage-current converter circuit IC3 join, voltage-current converter circuit IC3 is output as current detecting end M, it is characterized in that: be connected to zeroing circuit FH2 between the output terminal of described voltage-current converter circuit IC3 and the negative input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101097602A CN102262174A (en) | 2011-04-29 | 2011-04-29 | Voltage sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101097602A CN102262174A (en) | 2011-04-29 | 2011-04-29 | Voltage sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102262174A true CN102262174A (en) | 2011-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101097602A Pending CN102262174A (en) | 2011-04-29 | 2011-04-29 | Voltage sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102262174A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519575A (en) * | 2011-12-21 | 2012-06-27 | 成都赛腾自动化工程有限公司 | True RMS vibration intensity two wire transmitter |
| CN102944719A (en) * | 2012-11-16 | 2013-02-27 | 大连丰和日丽电气有限公司 | Passive direct-current voltage transducer |
| CN106124845A (en) * | 2016-08-30 | 2016-11-16 | 李纳 | Novel voltage detecting system |
| CN106370923A (en) * | 2016-08-30 | 2017-02-01 | 李纳 | Voltage monitoring device |
| CN109358225A (en) * | 2018-10-09 | 2019-02-19 | 沃尔特电子（苏州）有限公司 | A kind of detection device of detection circuit and trolleybus to the earth insulation performance |
| CN110672917A (en) * | 2019-11-19 | 2020-01-10 | 宁波中车时代传感技术有限公司 | Small-size voltage sensor circuit |
-
2011
- 2011-04-29 CN CN2011101097602A patent/CN102262174A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519575A (en) * | 2011-12-21 | 2012-06-27 | 成都赛腾自动化工程有限公司 | True RMS vibration intensity two wire transmitter |
| CN102519575B (en) * | 2011-12-21 | 2013-07-03 | 成都赛腾自动化工程有限公司 | True RMS vibration intensity two wire transmitter |
| CN102944719A (en) * | 2012-11-16 | 2013-02-27 | 大连丰和日丽电气有限公司 | Passive direct-current voltage transducer |
| CN106124845A (en) * | 2016-08-30 | 2016-11-16 | 李纳 | Novel voltage detecting system |
| CN106370923A (en) * | 2016-08-30 | 2017-02-01 | 李纳 | Voltage monitoring device |
| CN109358225A (en) * | 2018-10-09 | 2019-02-19 | 沃尔特电子（苏州）有限公司 | A kind of detection device of detection circuit and trolleybus to the earth insulation performance |
| CN110672917A (en) * | 2019-11-19 | 2020-01-10 | 宁波中车时代传感技术有限公司 | Small-size voltage sensor circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111130 |