CN102832922B - High-precise and high-synchronous novel analog signal distributor - Google Patents
High-precise and high-synchronous novel analog signal distributor Download PDFInfo
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- CN102832922B CN102832922B CN201210124873.4A CN201210124873A CN102832922B CN 102832922 B CN102832922 B CN 102832922B CN 201210124873 A CN201210124873 A CN 201210124873A CN 102832922 B CN102832922 B CN 102832922B
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Abstract
The invention discloses a high-precise and high-synchronous novel analog signal distributor, comprising a low-pass filter and a signal isolating circuit; high-frequency interference of a signal is reduced by using the low-pass filter so as to improve signal quality; and then the signal is isolated by using three linear optical couplers ISO (International Standardization Organization) 124 in the signal isolating circuit, so that an isolating direct current voltage between an original secondary side and a secondary side is 1,500V; the three-way isolating signal is amplified by using three operational amplifiers; zero wander at an output end is regulated by a zero circuit at an input end; gain is regulated by using a reverse proportion circuit at the input end; and one-way analog quantity realizes generating the same three-way analog quantity so as to be output. The analog signal distributor provided by the invention has the advantages of high precision, high synchronism and capabilities of increasing quantity of a signal source and saving cost greatly.
Description
Technical field
The present invention relates to the design of circuit in Analog Electronics Technique, be mostly applied in electric power system or big current, high voltage or AC power supply system.
Background technology
In electric power system or in big current, high voltage interchange or DC power system, control system relative complex.For the transducer of analog output, an analog signals generally can only be exported.In the power-supply system controlling complexity, various kinds of sensors output analog signals is not only needed to carry out the real-time negative feedback of completion system, and the gauge outfit of equipment also will show the key parameter of working equipment, monitoring and the Real-time Collection equipment of power-supply system all need by signal by computer acquisition and stored in hard disk, so that later accident analysis.For same transducer, if a road analog signals can only be exported, it is obviously the demand to equipment state signal that cannot meet whole control system.Simply analog signals is adopted and the mode connect, follow-up equipment shares a signal source, the so wherein signal shorted to earth that causes of arbitrary equipment or signal open circuit, other signal is also by short circuit or open circuit, real-time control system collects the signal of mistake and feeds back, power-supply system will big ups and downs or urgency be stopped instantaneously, very easily causes the damage of power-supply system, paralysis.Signal connect and cause the earth-return of electromagnetic compatibility to disturb altogether in addition, causes the excessive or distortion of the interference of signal.
In this type systematic, the quantity of various transducer is limited, and particularly transducer price that is high pressure resistant, big current is high, and increase number of sensors, cost is higher again.This distributor that the present invention introduces, there is high accuracy, high synchronism, a road analog quantity is generated three identical road analog outputs, adds the quantity of signal source, real-time control system, measuring system, Dial of instrument can use this signal, save a lot of cost.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, there is provided a kind of on monolithic wiring board, solve the problem such as analog signals low frequency filtering, former pair of limit isolation, pair limit isolation, the power amplification of signal and the synchronism of signal, well achieve and a road analog quantity is generated three identical road analog outputs.
The present invention is achieved by the following technical solutions:
An analog signal distributor for high accuracy, high synchronism, includes low pass filter and signal isolation circuit, described low pass filter internal circuit comprises the RC circuit be composed in series by resistance and capacitor and the gain circuitry be made up of amplifier one, the other end of described resistance is signal input part, the other end ground connection of capacitor, the anti-phase input of described amplifier one terminates between resistance and capacitor, the in-phase input end of amplifier one receives that one end of capacitor grounding, be parallel with a resistance between the inverting input of amplifier one and output, the output of amplifier one has three output branch roads, described signal isolation circuit comprises three linear optical couplings one, two, three and three amplifiers two, three, four, the signal exported in three of described low pass filter output branch roads is input to described three linear optical couplings one respectively, two, the signal input part of three, three linear optical couplings one, two, the signal received separately carries out isolating and from output, the signal after isolation is input to three amplifiers two corresponding with it by three, three, the inverting input of four, the equal ground connection of in-phase input end, exaggerated signal is respectively from amplifier two, three, the output of four exports, in amplifier two, three, the input of four all adds a zeroing circuit and reverse ratio circuit, described zeroing circuit is a resistance and adjustable resistance series connection, two fixing feet of adjustable resistance connect power positive cathode respectively, the other end of resistance is connected on the inverting input of the amplifier corresponding with its circuit, and described reverse ratio circuit is between a resistance and the adjustable resistance reverse input end that is connected in parallel on the amplifier corresponding with its circuit and output.
Feature of the present invention is also: in described low pass filter and signal isolation circuit, all electricity components are connected on same monolithic wiring board; Three described linear optical coupling models are ISO124; Described resistance is 10K Ω; The power supply of described amplifier one, two, three, four is separate; Described linear optical coupling one, two, three uses same Power supply with coupled amplifier two, three, four respectively.
Operation principle of the present invention is: the signal exported by voltage sensor is input to the signal input part of low pass filter by BNC head, the signal output frequency of voltage sensor generally can not more than 5KHz, signal passes through low pass filter, unwanted radio-frequency component in equipment can be removed, reduce the High-frequency Interference of signal, improve signal quality; Be input to by signal respectively in three linear optical coupling ISO124 by three output branch roads of low pass filter, three output branch roads do not pass through other time delay process, and the synchronism of output is very high, can reach the object controlled in real time; The linearity of linear optical coupling ISO124 is 0.01%, meets the requirement of precision; The signal of reception is isolated by linear optical coupling ISO124, make former pair of limit and pay limit between any two isolated DC voltage be 1500V, thus ensure that paying a limit exports a certain road and go wrong, other two paths of signals can not be influenced; Respectively the signal after three linear optical coupling ISO124 isolate is input in the amplifier corresponding with it and carries out power amplification and export, zeroing circuit and reverse ratio circuit is added at the input of each amplifier, the null offset of zeroing circuit adjustable output, reverse ratio circuit can adjust the size of gain, meets the requirement of user to output end signal amplitude; The object of isolation signals is isolated exactly " ", in the present invention, the power supply ground of all signals is all independently, and every road signal is all independent Power supply.
Advantage of the present invention is: invention increases low-pass filtering link, decreases the High-frequency Interference of signal, improves the quality of signal; Three output branch roads of low pass filter do not pass through other time delay process, and the synchronism of output is very high; Utilize linear optical coupling ISO124 more accurately 0.01% the linearity, add the zeroing circuit of output and reverse ratio circuit, can meet before and after equipment export remain on 0.5% accuracy rating; It also enables and a road analog quantity is generated three identical road analog outputs, add the quantity of signal source, saved a lot of cost.
Accompanying drawing explanation
Fig. 1 is low pass filter internal circuit diagram.
Fig. 2 is signal isolation circuit figure.
When Fig. 3 is input 5KHz frequency signal, input and output waveform of the present invention.
Fig. 4 is when breaking down in a certain road, input and output waveform of the present invention.
Embodiment
An analog signal distributor for high accuracy, high synchronism, includes low pass filter and signal isolation circuit, described low pass filter internal circuit as shown in Figure 1, comprise the RC circuit be composed in series by resistance R100 and capacitor C100 and the gain circuitry be made up of amplifier one U100, the other end of described resistance R100 is signal input part, the other end ground connection of capacitor C100, the anti-phase input of described amplifier one U100 terminates between resistance R100 and capacitor C100, the in-phase input end of amplifier one U100 receives that one end of capacitor C100 ground connection, a resistance R104 is parallel with between the inverting input of amplifier one U100 and output, the output of amplifier one U100 has three output branch roads, described signal isolation circuit as shown in Figure 2, comprises three linear optical coupling one U108, two U109, three U110 and three amplifier two U101, three U102, four U103, are input to described three linear optical coupling one U108 respectively by the signal exported in three of described low pass filter output branch roads, two U109, the signal input part of three U110, three linear optical coupling one U108, two U109, the signal received separately carries out isolating and from output, the signal after isolation is input to three amplifier two U101s corresponding with it by three U110, three U102, the inverting input of four U103, the equal ground connection of in-phase input end, exaggerated signal is respectively from amplifier two U101, three U102, the output of four U103 exports, at amplifier two U101, three U102, the input of four U103 all adds a zeroing circuit and reverse ratio circuit, described zeroing circuit is a resistance and adjustable resistance series connection, two fixing feet of adjustable resistance connect power positive cathode respectively, the other end of resistance is connected on the inverting input of the amplifier corresponding with its circuit, and described reverse ratio circuit is between a resistance and the adjustable resistance reverse input end that is connected in parallel on the amplifier corresponding with its circuit and output.In described low pass filter and signal isolation circuit, all electricity components are connected on same monolithic wiring board; Three described linear optical coupling models are ISO124; Described resistance is 10K Ω; The power supply of described amplifier one U100, two U101, three U102, four U103 is separate; Described linear optical coupling one U108, two U109, three U110 use same Power supply with coupled amplifier two U101, three U102, four U103 respectively.
Effect of the present invention is as follows:
As shown in Figure 3, CH1 is the input waveform that former limit oscilloscope gathers, and CH2, CH3, CH4 are the output waveforms of distributor.As seen from Figure 3, when frequency input signal 5KHz, the precision of input, output waveform all controls at peak value 10V, and signal does not have the decay in obvious phase deviation and amplitude, and three output signal synchronisms are very consistent, signal frequency f=5KHz; Withstand voltage: 1500VDC (mutual between two).
As shown in Figure 4, simulated failure situation, when output short-circuit occurs in a certain road of output (supposing CH2), can't affect the output on other two tunnels.
Claims (5)
1. an analog signal distributor for high accuracy, high synchronism, is characterized in that: include low pass filter and signal isolation circuit, described low pass filter internal circuit comprises the RC circuit be composed in series by resistance and capacitor and the gain circuitry be made up of the first operational amplifier, the other end of described resistance is signal input part, the other end ground connection of capacitor, the anti-phase input of described first operational amplifier terminates between resistance and capacitor, the in-phase input end of the first operational amplifier receives that one end of capacitor grounding, be parallel with a resistance between the inverting input of the first operational amplifier and output, the output of the first operational amplifier has three output branch roads, described signal isolation circuit comprises the first linear optical coupling, second linear optical coupling, third linear optocoupler and the second operational amplifier, 3rd operational amplifier, four-operational amplifier, is input to described first linear optical coupling respectively by the signal exported in three of described low pass filter output branch roads, second linear optical coupling, the signal input part of third linear optocoupler, the first linear optical coupling, second linear optical coupling, the signal received separately carries out isolating and from output, the signal after isolation is input to second operational amplifier corresponding with it by third linear optocoupler, 3rd operational amplifier, the inverting input of four-operational amplifier, the equal ground connection of in-phase input end, exaggerated signal is respectively from the second operational amplifier, 3rd operational amplifier, the output of four-operational amplifier exports, at the second operational amplifier, 3rd operational amplifier, the input of four-operational amplifier all adds a zeroing circuit and reverse ratio circuit, described zeroing circuit is a resistance and adjustable resistance series connection, two fixing feet of adjustable resistance connect power positive cathode respectively, the other end of resistance is connected on the inverting input of the amplifier corresponding with its circuit, and described reverse ratio circuit is between a resistance and the adjustable resistance reverse input end that is connected in parallel on the amplifier corresponding with its circuit and output.
2. the analog signal distributor of high accuracy according to claim 1, high synchronism, is characterized in that: in described low pass filter and signal isolation circuit, all electricity components are connected on same monolithic wiring board.
3. the analog signal distributor of high accuracy according to claim 1, high synchronism, is characterized in that: three described linear optical coupling models are ISO124.
4. the analog signal distributor of high accuracy according to claim 1, high synchronism, is characterized in that: described resistance is 10K Ω.
5. the analog signal distributor of high accuracy according to claim 1, high synchronism, is characterized in that: the power supply of the first described operational amplifier, the second operational amplifier, the 3rd operational amplifier, four-operational amplifier is separate; The first described linear optical coupling, the second linear optical coupling, third linear optocoupler use same Power supply with the second coupled operational amplifier, the 3rd operational amplifier, four-operational amplifier respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210124873.4A CN102832922B (en) | 2012-04-25 | 2012-04-25 | High-precise and high-synchronous novel analog signal distributor |
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| CN201210124873.4A CN102832922B (en) | 2012-04-25 | 2012-04-25 | High-precise and high-synchronous novel analog signal distributor |
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| CN102832922A CN102832922A (en) | 2012-12-19 |
| CN102832922B true CN102832922B (en) | 2015-02-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913988B (en) * | 2014-04-04 | 2016-04-13 | 中国海洋石油总公司 | A kind of current-mode analog quantity signal distributor |
| CN105974217B (en) * | 2016-02-24 | 2017-08-08 | 中国科学院等离子体物理研究所 | A kind of pulsqe distributor on-line fault diagnosis method |
| CN107196535B (en) * | 2017-07-20 | 2019-07-05 | 云南电网有限责任公司电力科学研究院 | A kind of inverter series connection synchronisation control means based on adaptive notch filter |
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| US4536715A (en) * | 1983-12-05 | 1985-08-20 | At&T Bell Laboratories | Linear dual detector opto-isolator circuit |
| US7132899B1 (en) * | 2004-10-22 | 2006-11-07 | Xilinx, Inc. | Method and apparatus for providing an improved high speed buffer |
| CN201341115Y (en) * | 2008-11-05 | 2009-11-04 | 中国北车股份有限公司大连电力牵引研发中心 | Isolation amplification circuit of alternating-current analog electrical signal based on linear optical coupler |
| CN201557091U (en) * | 2009-12-16 | 2010-08-18 | 台安科技(无锡)有限公司 | Circuit used for converting PWM signals into analogue signals |
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2012
- 2012-04-25 CN CN201210124873.4A patent/CN102832922B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536715A (en) * | 1983-12-05 | 1985-08-20 | At&T Bell Laboratories | Linear dual detector opto-isolator circuit |
| US7132899B1 (en) * | 2004-10-22 | 2006-11-07 | Xilinx, Inc. | Method and apparatus for providing an improved high speed buffer |
| CN201341115Y (en) * | 2008-11-05 | 2009-11-04 | 中国北车股份有限公司大连电力牵引研发中心 | Isolation amplification circuit of alternating-current analog electrical signal based on linear optical coupler |
| CN201557091U (en) * | 2009-12-16 | 2010-08-18 | 台安科技(无锡)有限公司 | Circuit used for converting PWM signals into analogue signals |
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| 一种高精度模拟信号分配模块的设计;程康等;《微计算机信息》;20101130;第26卷(第4-2期);179-180页 * |
| 传感器放大器零点漂移的分析及电路设计;王旭等;《煤矿机械》;20090131;第30卷(第1期);36-38页 * |
| 基于线性光耦HCNR201双极性信号隔离电路;杨居朋等;《光电技术应用》;20091231;第24卷(第6期);51-54页 * |
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Inventor after: Wang Linsen Inventor after: Huang Liansheng Inventor after: Wang Fusheng Inventor after: Tan Mu Inventor before: Wang Linsen Inventor before: Huang Liansheng Inventor before: Wang Fusheng |
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Address after: 230001 no.181 Gucheng Road, shiyangang Township, Hefei City, Anhui Province Patentee after: INSTITUTE OF PLASMA PHYSICS, CHINESE ACADEMY OF SCIENCES Address before: 230031 Shushan Lake Road, Shushan District, Anhui, China, No. 350, No. Patentee before: INSTITUTE OF PLASMA PHYSICS, CHINESE ACADEMY OF SCIENCES |