CN105827247A - Small signal output circuit for intelligent relay protection tester - Google Patents
Small signal output circuit for intelligent relay protection tester Download PDFInfo
- Publication number
- CN105827247A CN105827247A CN201610160057.7A CN201610160057A CN105827247A CN 105827247 A CN105827247 A CN 105827247A CN 201610160057 A CN201610160057 A CN 201610160057A CN 105827247 A CN105827247 A CN 105827247A
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- circuit
- amplifier
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- outfan
- signal output
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- 230000002093 peripheral Effects 0.000 claims description 9
- 229920000954 Polyglycolide Polymers 0.000 claims description 5
- 235000010409 propane-1,2-diol alginate Nutrition 0.000 claims description 5
- 230000001808 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000003287 optical Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004899 motility Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—BASIC ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Abstract
The invention discloses a small signal output circuit for an intelligent relay protection tester, which comprises a D/A conversion circuit, a second-order filter circuit, a voltage following circuit and an anti-surge circuit, wherein the D/A conversion circuit is connected with the second-order filter circuit; the output end of the second-order filter circuit is connected with the voltage following circuit; and the output end of the voltage following circuit is connected with the anti-surge circuit. According to the small signal output circuit for the intelligent relay protection tester provided by the invention, a PWM digital signal outputted by an external controller is converted into an analog signal via the D/A conversion circuit, signal output is then carried out via the second-order filter circuit, the voltage following circuit and the anti-surge circuit, and the circuit stability is good.
Description
Technical field
The present invention relates to the small-signal output circuit of a kind of intelligence relay-protection tester.
Background technology
Owing to the information feedback amount of tradition transformer station is little; fault message is difficult to Macro or mass analysis; wiring complexity is loaded down with trivial details; and have the problems such as security risk for on-the-spot test operations staff; and in these years the developing rapidly of information, communication and network technology; people have begun to attempt researching and developing corresponding product and match, the therefore generation of intelligence relay-protection tester.
Intelligence relay-protection tester in the course of the work, needs logical small-signal output port that test data are sent in the way of analogue signal tested relay, gathers the response condition of tested relay further, provide foundation for subsequent analysis.Therefore, the small-signal output circuit of intelligence relay-protection tester is extremely important for intelligence relay-protection tester.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art; the small-signal output circuit of a kind of intelligence relay-protection tester is provided; the PWM count word signal exported by peripheral control unit by D/A change-over circuit is converted into analogue signal; carried out the output of signal again by second-order filter circuit, voltage follower circuit and anti-surge circuit, circuit stability is good.
It is an object of the invention to be achieved through the following technical solutions: the small-signal output circuit of a kind of intelligence relay-protection tester, including D/A change-over circuit, second-order filter circuit, voltage follower circuit and anti-surge circuit；Described D/A change-over circuit is connected with second-order filter circuit, the outfan of second-order filter circuit is connected with voltage follower circuit, and the outfan of voltage follower circuit is connected with anti-surge circuit；
Described D/A change-over circuit includes that photoelectrical coupler G, the first input end of photoelectrical coupler G are connected to the PWM count word signal output part P of peripheral control unit；Second input end grounding of optical coupling isolator G；nullThe outfan of photoelectrical coupler G is connected to high level VCC by the first resistance R1，The outfan of photoelectrical coupler G is connected to the reverse input end of the first amplifier A1 by the second resistance R2 and the 3rd resistance R3 of series connection，By the first electric capacity C1 ground connection between second resistance R2 and the 3rd resistance R3，The positive input of the first amplifier A1 passes through the 4th resistance R4 ground connection，The reverse input end of the first amplifier A1 the 5th resistance R5 in parallel and the second electric capacity C2 is connected to the outfan of the first amplifier A1，The outfan of the first amplifier A1 is by the 9th resistance R9 output analogue signal and is connected to second-order filter circuit，It is connected to the reverse input end of the second amplifier A2 by the 3rd electric capacity C3 between second resistance R2 and the 3rd resistance R3，The positive input of the second amplifier A2 passes through the 6th resistance R6 ground connection，The reverse input end of the second amplifier A2 is connected to the outfan of the second amplifier A2 by the 7th resistance R7，The outfan of the second amplifier A2 is connected to the reverse input end of the first amplifier A1 by the 8th resistance R8.
Described second-order filter circuit is Order RC filter circuit, including Order RC wave filter；The input of Order RC wave filter is connected with D/A change-over circuit, and the input of Order RC wave filter is connected with voltage follower circuit.
Described voltage follower circuit the 3rd amplifier A3, the positive input of amplifier A3 is connected with Order RC filter circuit, and the outfan of amplifier A3 is connected with reverse input end and the anti-surge circuit of amplifier A3 respectively.
Described anti-surge circuit includes gas-discharge tube D, the tenth resistance R10 and TVS pipe；First end of the tenth resistance R10 and the first common point connect；First common point is connected with the outfan of voltage follower circuit and one end of TVS pipe respectively；The other end of the tenth resistance R10 is connected to the second common point, is connected to the signal output part of anti-surge circuit by the second common point；Second common point is connected with one end of gas-discharge tube D；The other end ground connection of gas-discharge tube D and being connected with TVS pipe.
The small-signal output circuit of described a kind of intelligence relay-protection tester, also includes that amplifying circuit, described amplifying circuit are arranged between second-order filter circuit and voltage follower circuit.
Described amplifying circuit includes gain amplifier PGA.
The invention has the beneficial effects as follows: by D/A change-over circuit, the PWM count word signal of the output of peripheral control unit is converted into analogue signal, be filtered, carried out by voltage follower circuit and anti-surge circuit the output of signal again by second-order filter circuit, circuit has good stability.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the present invention；
Fig. 2 is the schematic diagram of D/A change-over circuit；
Fig. 3 is the schematic diagram of voltage follower circuit；
Fig. 4 is the schematic diagram of anti-surge circuit.
Detailed description of the invention
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to the following stated.
As it is shown in figure 1, the small-signal output circuit of a kind of intelligence relay-protection tester, including D/A change-over circuit, second-order filter circuit, voltage follower circuit and anti-surge circuit；Described D/A change-over circuit is connected with second-order filter circuit, the outfan of second-order filter circuit is connected with voltage follower circuit, and the outfan of voltage follower circuit is connected with anti-surge circuit；
Described D/A change-over circuit includes that photoelectrical coupler G, the first input end of photoelectrical coupler G are connected to the PWM count word signal output part P of peripheral control unit；Second input end grounding of optical coupling isolator G；nullThe outfan of photoelectrical coupler G is connected to high level VCC by the first resistance R1，The outfan of photoelectrical coupler G is connected to the reverse input end of the first amplifier A1 by the second resistance R2 and the 3rd resistance R3 of series connection，By the first electric capacity C1 ground connection between second resistance R2 and the 3rd resistance R3，The positive input of the first amplifier A1 passes through the 4th resistance R4 ground connection，The reverse input end of the first amplifier A1 the 5th resistance R5 in parallel and the second electric capacity C2 is connected to the outfan of the first amplifier A1，The outfan of the first amplifier A1 is by the 9th resistance R9 output analogue signal and is connected to second-order filter circuit，It is connected to the reverse input end of the second amplifier A2 by the 3rd electric capacity C3 between second resistance R2 and the 3rd resistance R3，The positive input of the second amplifier A2 passes through the 6th resistance R6 ground connection，The reverse input end of the second amplifier A2 is connected to the outfan of the second amplifier A2 by the 7th resistance R7，The outfan of the second amplifier A2 is connected to the reverse input end of the first amplifier A1 by the 8th resistance R8.
Further, peripheral control unit can be single-chip microcomputer, it is also possible to be dsp processor, and the small-signal output circuit of the application is exactly for the pwm signal that peripheral control unit exports being converted to analogue signal and exporting.
Described second-order filter circuit is Order RC filter circuit, including Order RC wave filter；The input of Order RC wave filter is connected with D/A change-over circuit, and the input of Order RC wave filter is connected with voltage follower circuit.
Described voltage follower circuit the 3rd amplifier A3, the positive input of amplifier A3 is connected with Order RC filter circuit, and the outfan of amplifier A3 is connected with reverse input end and the anti-surge circuit of amplifier A3 respectively.
Described anti-surge circuit includes gas-discharge tube D, the tenth resistance R10 and TVS pipe；First end of the tenth resistance R10 and the first common point connect；First common point is connected with the outfan of voltage follower circuit and one end of TVS pipe respectively；The other end of the tenth resistance R10 is connected to the second common point, is connected to the signal output part of anti-surge circuit by the second common point；Second common point is connected with one end of gas-discharge tube D；The other end ground connection of gas-discharge tube D and being connected with TVS pipe.
The small-signal output circuit of described a kind of intelligence relay-protection tester, also includes that amplifying circuit, described amplifying circuit are arranged between second-order filter circuit and voltage follower circuit.
Described amplifying circuit includes gain amplifier PGA, the adjustable gain of gain amplifier PGA so that whole circuit has the highest motility.
In work process, after small-signal output circuit receives the PWM count word signal of outside, being converted to analogue signal by D/A change-over circuit, then be filtered, carried out by voltage follower circuit and anti-surge circuit the output of signal by second-order filter circuit, circuit has good stability.
The isolation to peripheral control unit and internal circuit is achieved by optical coupling isolator in carrying out D/A transformation process；
The outfan of photoelectrical coupler is provided with the low-pass filter being made up of the first amplifier and peripheral circuit thereof, is filtered processing to the analogue signal of photoelectrical coupler output；For spike interference present in analogue signal, detection spike disturbed by the second amplifier, testing result is fed back to the input of the first amplifier, it can be made to carry out dynamic filter for the change disturbing signal in analogue signal, thus improve the filter effect for analogue signal；Second-order filter circuit, further increases the filter effect for analogue signal；Voltage follower circuit, reduces the output impedance of this circuit analog quantity output, improves load capacity and the linear stable degree of circuit；When having big surge voltage input in outside, energy is discharged into rapidly the earth by gas-discharge tube D, and the most described tenth resistance R10 and described TVS pipe prevent residual amount of energy from entering, thus effectively prevent the impact that circuit is produced by surge.
Simultaneously as be provided with amplifying circuit between second-order filter circuit and voltage follower circuit, amplifying circuit is realized by gain amplifier PGA, thus gain amplifier is adjustable so that whole circuit has the highest motility.
Claims (6)
1. the small-signal output circuit of an intelligent relay-protection tester, it is characterised in that: include D/A change-over circuit, second-order filter circuit, voltage follower circuit and anti-surge circuit；Described D/A change-over circuit is connected with second-order filter circuit, the outfan of second-order filter circuit is connected with voltage follower circuit, and the outfan of voltage follower circuit is connected with anti-surge circuit；
Described D/A change-over circuit includes that photoelectrical coupler G, the first input end of photoelectrical coupler G are connected to the pwm signal outfan P of peripheral control unit；Second input end grounding of optical coupling isolator G；nullThe outfan of photoelectrical coupler G is connected to high level VCC by the first resistance R1，The outfan of photoelectrical coupler G is connected to the reverse input end of the first amplifier A1 by the second resistance R2 and the 3rd resistance R3 of series connection，By the first electric capacity C1 ground connection between second resistance R2 and the 3rd resistance R3，The positive input of the first amplifier A1 passes through the 4th resistance R4 ground connection，The reverse input end of the first amplifier A1 the 5th resistance R5 in parallel and the second electric capacity C2 is connected to the outfan of the first amplifier A1，The outfan of the first amplifier A1 is by the 9th resistance R9 output analogue signal and is connected to second-order filter circuit，It is connected to the reverse input end of the second amplifier A2 by the 3rd electric capacity C3 between second resistance R2 and the 3rd resistance R3，The positive input of the second amplifier A2 passes through the 6th resistance R6 ground connection，The reverse input end of the second amplifier A2 is connected to the outfan of the second amplifier A2 by the 7th resistance R7，The outfan of the second amplifier A2 is connected to the reverse input end of the first amplifier A1 by the 8th resistance R8.
The small-signal output circuit of a kind of intelligence relay-protection tester the most according to claim 1, it is characterised in that: described second-order filter circuit is Order RC filter circuit, including Order RC wave filter；The input of Order RC wave filter is connected with D/A change-over circuit, and the input of Order RC wave filter is connected with voltage follower circuit.
The small-signal output circuit of a kind of intelligence relay-protection tester the most according to claim 1; it is characterized in that: described voltage follower circuit the 3rd amplifier A3; the positive input of amplifier A3 is connected with Order RC filter circuit, and the outfan of amplifier A3 is connected with reverse input end and the anti-surge circuit of amplifier A3 respectively.
The small-signal output circuit of a kind of intelligence relay-protection tester the most according to claim 1, it is characterised in that: described anti-surge circuit includes gas-discharge tube D, the tenth resistance R10 and TVS pipe；First end of the tenth resistance R10 and the first common point connect；First common point is connected with the outfan of voltage follower circuit and one end of TVS pipe respectively；The other end of the tenth resistance R10 is connected to the second common point, is connected to the signal output part of anti-surge circuit by the second common point；Second common point is connected with one end of gas-discharge tube D；The other end ground connection of gas-discharge tube D and being connected with TVS pipe.
The small-signal output circuit of a kind of intelligence relay-protection tester the most according to claim 1, it is characterised in that: also include that amplifying circuit, described amplifying circuit are arranged between second-order filter circuit and voltage follower circuit.
The small-signal output circuit of a kind of intelligence relay-protection tester the most according to claim 6, it is characterised in that: described amplifying circuit includes gain amplifier PGA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160057.7A CN105827247A (en) | 2016-03-21 | 2016-03-21 | Small signal output circuit for intelligent relay protection tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160057.7A CN105827247A (en) | 2016-03-21 | 2016-03-21 | Small signal output circuit for intelligent relay protection tester |
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| Publication Number | Publication Date |
|---|---|
| CN105827247A true CN105827247A (en) | 2016-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610160057.7A Pending CN105827247A (en) | 2016-03-21 | 2016-03-21 | Small signal output circuit for intelligent relay protection tester |
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|---|---|
| CN (1) | CN105827247A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106122557A (en) * | 2016-09-21 | 2016-11-16 | 潘琳琳 | A kind of intelligent electric valve positioner |
| CN110401181A (en) * | 2019-07-02 | 2019-11-01 | 浙江大华技术股份有限公司 | A kind of surging protection circuit |
| CN110763934A (en) * | 2019-10-14 | 2020-02-07 | 许继电气股份有限公司 | Relay protection testing arrangement |
| CN112748269A (en) * | 2020-12-03 | 2021-05-04 | 国网山东省电力公司青岛供电公司 | Function expansion current-voltage conversion device and method applied to relay protection tester |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698638A (en) * | 2013-12-27 | 2014-04-02 | 哈尔滨理大晟源科技开发有限公司 | D/A (Digital-to-Analog) conversion circuit unit for relay protection experiment instrument |
| CN204203687U (en) * | 2014-10-26 | 2015-03-11 | 苏州英纳索智能科技有限公司 | A kind of analogue quantity output circuit |
| CN205017308U (en) * | 2015-08-19 | 2016-02-03 | 江西创成电子有限公司 | DA converting circuit with filtering function |
-
2016
- 2016-03-21 CN CN201610160057.7A patent/CN105827247A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698638A (en) * | 2013-12-27 | 2014-04-02 | 哈尔滨理大晟源科技开发有限公司 | D/A (Digital-to-Analog) conversion circuit unit for relay protection experiment instrument |
| CN204203687U (en) * | 2014-10-26 | 2015-03-11 | 苏州英纳索智能科技有限公司 | A kind of analogue quantity output circuit |
| CN205017308U (en) * | 2015-08-19 | 2016-02-03 | 江西创成电子有限公司 | DA converting circuit with filtering function |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106122557A (en) * | 2016-09-21 | 2016-11-16 | 潘琳琳 | A kind of intelligent electric valve positioner |
| CN110401181A (en) * | 2019-07-02 | 2019-11-01 | 浙江大华技术股份有限公司 | A kind of surging protection circuit |
| CN110763934A (en) * | 2019-10-14 | 2020-02-07 | 许继电气股份有限公司 | Relay protection testing arrangement |
| CN112748269A (en) * | 2020-12-03 | 2021-05-04 | 国网山东省电力公司青岛供电公司 | Function expansion current-voltage conversion device and method applied to relay protection tester |
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