CN102832922A - 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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- CN102832922A CN102832922A CN2012101248734A CN201210124873A CN102832922A CN 102832922 A CN102832922 A CN 102832922A CN 2012101248734 A CN2012101248734 A CN 2012101248734A CN 201210124873 A CN201210124873 A CN 201210124873A CN 102832922 A CN102832922 A CN 102832922A
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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 the Analog Electronics Technique, be applied in mostly in electric power system or big electric current, high voltage or the AC power supply system.
Background technology
In electric power system or in big electric current, high voltage interchange or the DC power system, the control system relative complex.For the transducer of analog quantity output, generally can only export an analog signals.In the power-supply system of control complicacy; Not only need various kinds of sensors output analog signals to accomplish the real-time negative feedback of system; And the gauge outfit of equipment also will show the key parameter of working equipment; The monitoring of power-supply system and real-time collecting device all need be with signal through computer acquisitions and deposit hard disk in, so that later accident analysis.For same transducer,, obviously be the demand to the equipment state signal that can't satisfy The whole control system if can only export one road analog signals.The mode that simply analog signals is adopted and connects; The shared signal source of follow-up equipment; Signal shorted to earth or signal that so wherein arbitrary equipment causes open circuit, and other signal also perhaps opens circuit short circuit, and real-time control system collects wrong signal and feedback; Power-supply system will perhaps suddenly be stopped in the moment big ups and downs, very easily causes damage, the paralysis of power-supply system.Signal and connect the earth-return that causes electromagnetic compatibility commonly and disturb causes the excessive or distortion of interference of signal in addition.
The quantity of various transducers is limited in this type systematic, and the transducer expensive of particularly high pressure resistant, big electric current increases number of sensors, and cost is higher again.This distributor that the present invention introduces; Have high accuracy, high synchronism, one tunnel analog quantity has been generated identical three tunnel analog quantitys output, increased the quantity of signal source; Real-time control system, measuring system, Dial of instrument can both use this signal, practice thrift a lot of costs.
Summary of the invention
The object of the invention is exactly in order to remedy the defective of prior art; A kind of analog signals low frequency filtering, former pair of limit isolation, pair limit isolation, the power amplification of signal and problem such as synchronism of signal of on the monolithic wiring board, solving is provided, well realized one tunnel analog quantity has been generated identical three tunnel analog quantitys output.
The present invention realizes through following technical scheme:
The novel analog signal distributor of a kind of high accuracy, high synchronism includes low pass filter and signal isolation circuit; Described low pass filter internal circuit comprises RC circuit of being made up of resistance and capacitors in series and the gain circuitry that is made up of amplifier one; The other end of said resistance is a signal input part; The other end ground connection of capacitor, the inverting input of said amplifier one are connected between resistance and the capacitor, and the in-phase input end of amplifier one is received that end of capacitor grounding; Be parallel with a resistance between the inverting input of amplifier one and the output, the output of amplifier one has three output branch roads; Described signal isolation circuit comprises one, two, three and three amplifiers two, three, four of three linear optical couplings; The signal of exporting in three output branch roads with said low pass filter is input to the signal input part of said three linear optical couplings one, two, three respectively; Signal after the signal that three linear optical couplings one, two, three will receive is separately isolated and will be isolated from output is input to the inverting input of three amplifiers two, three, four corresponding with it; The equal ground connection of in-phase input end; The signal that is exaggerated is exported from the output of amplifier two, three, four respectively; Input in amplifier two, three, four all adds a zeroing circuit and reverse ratio circuit; Described zeroing circuit is resistance and adjustable resistance series connection; Two fixing feet of adjustable resistance connect power positive cathode respectively, and the other end of resistance is connected on the inverting input with the corresponding amplifier of its circuit, described reverse ratio circuit be a resistance and an adjustable resistance be connected in parallel on and the reverse input end and output of the corresponding amplifier of its circuit between.
Characteristic of the present invention also is: all electricity components are connected on the same monolithic wiring board in described low pass filter and the signal isolation circuit; Described three 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 power supply with coupled amplifier two, three, four respectively.
Operation principle of the present invention is: the signal input part that the signal of voltage sensor output is input to low pass filter through the BNC head; The signal output frequency of voltage sensor generally can not surpass 5KHz; Signal passes through low pass filter; Can remove unwanted radio-frequency component in the equipment, reduce the High-frequency Interference of signal, promote signal quality; Three output branch roads through low pass filter are input to signal among three linear optical coupling ISO124 respectively, and three output branch roads do not have the time delay process through other, and the synchronism of output is very high, can reach the purpose of real-time control; The linearity of linear optical coupling ISO124 is 0.01%, satisfies the requirement of precision; Linear optical coupling ISO124 isolates the signal that receives, make former pair of limit with pay the limit between any two isolated DC voltage be 1500V, export a certain road and go wrong thereby guarantee to pay a limit, other two paths of signals can be not influenced; Signal after will isolating through three linear optical coupling ISO124 respectively is input to and carries out power amplification and output in the amplifier corresponding with it; Input in each amplifier all adds zeroing circuit and reverse ratio circuit; Zeroing circuit can be adjusted the null offset of output; Reverse ratio circuit can be adjusted the size of gain, satisfies the requirement of user to the output end signal amplitude; The purpose of isolation signals isolate exactly " ", the power supply ground of all signals all is independently among the present invention, every road signal all is the power supply of independent power supply.
Advantage of the present invention is: the present invention has increased the LPF link, has reduced the High-frequency Interference of signal, has promoted the quality of signal; Three output branch roads of low pass filter do not have the time delay process through other, and the synchronism of output is very high; Utilize 0.01% the linearity more accurately of linear optical coupling ISO124, zeroing circuit that adds output and reverse ratio circuit can satisfy output before and after the equipment and remain on 0.5% accuracy rating; It has also realized one tunnel analog quantity has been generated identical three tunnel analog quantitys output, has increased the quantity of signal source, has practiced thrift a lot of costs.
Description of drawings
Fig. 1 is the 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 break down in a certain road, input and output waveform of the present invention.
Embodiment
The novel analog signal distributor of a kind of high accuracy, high synchronism includes low pass filter and signal isolation circuit; Described low pass filter internal circuit is as shown in Figure 1; Comprise RC circuit that is composed in series by resistance R 100 and capacitor C100 and the gain circuitry that constitutes by amplifier one U100; The other end of said resistance R 100 is a signal input part; The other end ground connection of capacitor C100, the inverting input of said amplifier one U100 are connected between resistance R 100 and the capacitor C100, and the in-phase input end of amplifier one U100 is received that end of capacitor C100 ground connection; Be parallel with a resistance R 104 between the inverting input of amplifier one U100 and the output, the output of amplifier one U100 has three output branch roads; Described signal isolation circuit is as shown in Figure 2; Comprise three linear optical coupling one U108, two U109, three U110 and three amplifier two U101, three U102, four U103; The signal of exporting in three output branch roads with said low pass filter is input to the signal input part of said three linear optical coupling one U108, two U109, three U110 respectively; Signal after the signal that three linear optical coupling one U108, two U109, three U110 will receive is separately isolated and will be isolated from output is input to the inverting input of three amplifier two U101s corresponding with it, three U102, four U103; The equal ground connection of in-phase input end; The signal that is exaggerated is exported from the output of amplifier two U101, three U102, four U103 respectively; Input at amplifier two U101, three U102, four U103 all adds a zeroing circuit and reverse ratio circuit; Described zeroing circuit is resistance and adjustable resistance series connection; Two fixing feet of adjustable resistance connect power positive cathode respectively, and the other end of resistance is connected on the inverting input with the corresponding amplifier of its circuit, described reverse ratio circuit be a resistance and an adjustable resistance be connected in parallel on and the reverse input end and output of the corresponding amplifier of its circuit between.All electricity components are connected on the same monolithic wiring board in described low pass filter and the signal isolation circuit; Described three 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 power supply with coupled amplifier two U101, three U102, four U103 respectively.
Effect of the present invention is following:
As shown in Figure 3, CH1 is the input waveform that former limit oscilloscope is gathered, CH2,3, the 4th, the output waveform of distributor.Visible by Fig. 3, in frequency input signal 5KHz, the precision of input, output waveform all is controlled at peak-to-peak value 10V, and signal does not have the decay on tangible phase deviation and the amplitude, and three output signal Synchronization property are very consistent, signal frequency f=5KHz; Withstand voltage: 1500VDC (mutual in twos).
As shown in Figure 4, the simulated failure situation when output short-circuit takes place on a certain road of output (supposing CH2), can't influence other output of two tunnel.
Claims (5)
1. the novel analog signal distributor of a high accuracy, high synchronism is characterized in that: include low pass filter and signal isolation circuit; Described low pass filter internal circuit comprises RC circuit of being made up of resistance and capacitors in series and the gain circuitry that is made up of amplifier one; The other end of said resistance is a signal input part; The other end ground connection of capacitor, the inverting input of said amplifier one are connected between resistance and the capacitor, and the in-phase input end of amplifier one is received that end of capacitor grounding; Be parallel with a resistance between the inverting input of amplifier one and the output, the output of amplifier one has three output branch roads; Described signal isolation circuit comprises one, two, three and three amplifiers two, three, four of three linear optical couplings; The signal of exporting in three output branch roads with said low pass filter is input to the signal input part of said three linear optical couplings one, two, three respectively; Signal after the signal that three linear optical couplings one, two, three will receive is separately isolated and will be isolated from output is input to the inverting input of three amplifiers two, three, four corresponding with it; The equal ground connection of in-phase input end; The signal that is exaggerated is exported from the output of amplifier two, three, four respectively; Input in amplifier two, three, four all adds a zeroing circuit and reverse ratio circuit; Described zeroing circuit is resistance and adjustable resistance series connection; Two fixing feet of adjustable resistance connect power positive cathode respectively, and the other end of resistance is connected on the inverting input with the corresponding amplifier of its circuit, described reverse ratio circuit be a resistance and an adjustable resistance be connected in parallel on and the reverse input end and output of the corresponding amplifier of its circuit between.
2. the novel analog signal distributor of high accuracy according to claim 1, high synchronism is characterized in that: all electricity components are connected on the same monolithic wiring board in described low pass filter and the signal isolation circuit.
3. the novel analog signal distributor of high accuracy according to claim 1, high synchronism is characterized in that: described three linear optical coupling models are ISO124.
4. the novel analog signal distributor of high accuracy according to claim 1, high synchronism is characterized in that: described resistance is 10K Ω.
5. the novel analog signal distributor of high accuracy according to claim 1, high synchronism is characterized in that: the power supply of described amplifier one, two, three, four is separate; Described linear optical coupling one, two, three uses same power supply power supply with coupled amplifier two, three, four respectively.
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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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| CN102832922B CN102832922B (en) | 2015-02-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913988A (en) * | 2014-04-04 | 2014-07-09 | 中国海洋石油总公司 | Current analog quantity signal distributor |
| CN105974217A (en) * | 2016-02-24 | 2016-09-28 | 中国科学院等离子体物理研究所 | Pulse distributor online fault diagnosis method |
| CN107196535A (en) * | 2017-07-20 | 2017-09-22 | 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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| 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
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Patent Citations (4)
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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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913988A (en) * | 2014-04-04 | 2014-07-09 | 中国海洋石油总公司 | Current analog quantity signal distributor |
| CN105974217A (en) * | 2016-02-24 | 2016-09-28 | 中国科学院等离子体物理研究所 | Pulse distributor online fault diagnosis method |
| 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 |
| CN107196535A (en) * | 2017-07-20 | 2017-09-22 | 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 |
| 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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| CN102832922B (en) | 2015-02-04 |
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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 |