CN102944719B - Passive direct-current voltage transducer - Google Patents
Passive direct-current voltage transducer Download PDFInfo
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- CN102944719B CN102944719B CN201210461510.XA CN201210461510A CN102944719B CN 102944719 B CN102944719 B CN 102944719B CN 201210461510 A CN201210461510 A CN 201210461510A CN 102944719 B CN102944719 B CN 102944719B
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Abstract
The present invention discloses a kind of passive direct-current voltage transducer, the oscillatory circuit be made up of bleeder circuit, many taps high-frequency transformer and rectification circuit are formed, bleeder circuit is by inputted high-voltage dc voltage dividing potential drop, through the oscillatory circuit conversion isolation of many taps high-frequency transformer composition, then export the voltage proportional with the high-voltage dc signal inputted or current signal through precise rectification circuit; The oscillatory circuit formed for many taps high-frequency transformer through the voltage division signal of bleeder circuit gained provides working power.Modulated by many taps high-frequency transformer precise signal, not only effectively achieve the isolation of former polygonal voltage, preventing high pressure from scurrying into low pressure end causes the output device of low pressure end to damage, and oscillating part to be added with compensating circuit conversion accuracy higher, fast response time, the former edge component voltage directly can using measuring junction carries out work, and without the need to additionally increasing power supply, wiring is simple, easy for installation, it is little to take up room.
Description
Technical field
The present invention relates to a kind of voltage sensor, especially a kind of wiring be simple, easy for installation, the little and precision of taking up room and the high passive direct-current voltage transducer of security.
Background technology
In multiple fields such as track traffic, electric power network and industrial automations, need to measure high voltage and control.Conventional method adopts voltage conversion apparatus high voltage scaling transformation to be become normal low voltage (as 10V or 20mA), to realize the standardization of measurement instrument, proterctive equipment and automatic control equipment.Existing voltage conversion apparatus has electromagnetic potential transformer, voltage changer and voltage sensor etc.Traditional electromagnetic potential transformer can only measure ac voltage signal by electromagnetic induction principle, and then cannot carry out measurement conversion for d. c. voltage signal, its usable range is narrower; Voltage changer utilizes original edge voltage to be changed by electric resistance partial pressure principle, voltage after dividing potential drop is as secondary limit power supply (without the need to extra power supply), but do not realize real isolation between former limit high input voltage and secondary limit export, easy generation high pressure is scurried into low pressure end and is caused the output device of low pressure end to damage, and security is poor; Voltage sensor generally carries out voltage transitions by principles such as Hall isolation amplification, magnetic modulation or Phototube Coupling amplifications, although can d. c. voltage signal be measured and can isolated high-voltage, but need extra introducing secondary power supply during application, for former limit, signal amplification is carried out on secondary limit, process provides working power, introduce secondary power supply and not only strengthen installing space, and too increase wiring trouble, more a lot of occasion cannot provide (DC voltage of more than the 750V only used as track traffic industry especially) secondary power supply, limits its application.
Summary of the invention
The present invention is the above-mentioned technical matters in order to solve existing for prior art, provides that a kind of wiring is simple, easy for installation, the little and precision of taking up room and the high passive direct-current voltage transducer of security.
Technical solution of the present invention is: a kind of passive direct-current voltage transducer, it is characterized in that: primarily of oscillatory circuit and the precise rectification circuit formation of bleeder circuit, many taps high-frequency transformer composition, bleeder circuit is by inputted high-voltage dc voltage dividing potential drop, through the oscillatory circuit conversion isolation of many taps high-frequency transformer composition, then export the voltage proportional with the high-voltage dc signal inputted or current signal through precise rectification circuit; The oscillatory circuit formed for many taps high-frequency transformer through the voltage division signal of bleeder circuit gained provides working power.
Also be provided with the compensating circuit of the oscillator signal of the oscillatory circuit sampled in the voltage division signal of bleeder circuit and many taps high-frequency transformer composition, described through the voltage division signal of bleeder circuit gained and the signal of oscillatory circuit for compensating circuit provides working power.
Described precise rectification circuit, primarily of high-frequency transformer and field effect transistor element composition, realizes the precision rectifying of signal.
Containing differentiating circuit, integrating circuit and comparator circuit in compensating circuit, for oscillatory circuit switching signal and signal output load change provide adjustment, feedback compensation, make the signal of output more stable, more accurate.
Described bleeder circuit is by electric resistance partial pressure, is provided with by stabilivolt or/and the protection circuit that forms of diode simultaneously.
Be provided with base plate, base plate is fixed with the oscillatory circuit of interior envelope many taps high-frequency transformer composition and the signal conversion module of rectification circuit and signal output terminal, lower layer support post and upper strata support column is also connected at base plate, circuit board is fixed with in lower layer support post upper end, circuit board there are bleeder circuit and signal input terminal, are fixed with protective shield in support column upper end, upper strata.
Described precise rectification circuit is made up of secondary winding T1-C1, the T1-C2 of many taps high-frequency transformer T1, triode Q4, field effect transistor Q2, Q7, inductance L 2, electric capacity C3 and resistance R13, the two ends of the secondary winding T1-C1 of many taps high-frequency transformer T1 connect with field effect transistor Q2 and field effect transistor Q7 respectively, field effect transistor Q2 connects with field effect transistor Q7, the secondary winding T1-C1 centre tap of many taps high-frequency transformer T1 connects with the base stage of triode Q4 and collector, and the emitter of triode Q4 connects with the contact of field effect transistor Q2 and field effect transistor Q7; The two ends of the secondary winding T1-C2 of many taps high-frequency transformer T1 connect with field effect transistor Q2 and field effect transistor Q7 respectively, the secondary winding T1-C2 centre tap of many taps high-frequency transformer T1 connects with inductance L 2, inductance L 2 is connected with the contact of field effect transistor Q2 and field effect transistor Q7 by electric capacity C3, and inductance L 2 connects with resistance R13 with the contact of electric capacity C3.
The oscillatory circuit of described many taps high-frequency transformer composition is provided with the stabilivolt D2 be in series, diode D1 and electric capacity C4, resistance R14 is parallel with electric capacity C4, the contact of electric capacity C4 and resistance R14 is by resistance R6, field effect transistor Q3 connects with one end of the former limit winding T1-Y1 of many taps high-frequency transformer T1, resistance R14 is by resistance R12, field effect transistor Q1 connects with the other end of the former limit winding T1-Y1 of many taps high-frequency transformer T1, field effect transistor Q3 connects with field effect transistor Q1, resistance R12 is also connected with one end of many taps high-frequency transformer T1 former limit winding T1-Y2 by resistance R9, the other end and the resistance R6 of former limit winding T1-Y2 connect with the contact of field effect transistor Q3.
Described compensating circuit is provided with operational amplifier N1, the first input end of operational amplifier N1 connects with resistance R5 and resistance R8, resistance R5 is successively by resistance R1, resistance R2 connects with second input end of operational amplifier N1, electric capacity C2 is connected between second input end of operational amplifier N1 and output terminal, the output terminal of operational amplifier N1 is connected with field effect transistor Q5 by resistance R7, output one tunnel and the resistance R11 be in series of field effect transistor Q5, stabilivolt D6 connects, another road and inductance L 1, electric capacity C1 and resistance R3 connects, the other end of electric capacity C1 connects with diode D1, the other end of resistance R3 is connected to the contact of electric capacity C1 and diode D1 by resistance R4, resistance R3 connects with the negative power end of operational amplifier N1 with the contact of resistance R4, the positive power source terminal of operational amplifier N1 connects with field effect transistor Q6 and resistance R10, resistance R20 is also connected to operational amplifier N1.
The present invention by bleeder circuit by inputted high-voltage dc voltage dividing potential drop, through the oscillatory circuit conversion isolation of many taps high-frequency transformer composition, the voltage proportional with the high-voltage dc signal inputted or current signal is exported again through precise rectification circuit, modulated by many taps high-frequency transformer precise signal, not only effectively achieve the isolation of former polygonal voltage, preventing high pressure from scurrying into low pressure end causes the output device of low pressure end to damage, and conversion accuracy is higher; The voltage that the former edge directly can using measuring junction is divided carries out work, and without the need to additionally increasing power supply, wiring is simple, easy for installation, it is little to take up room.Especially set compensating circuit can be used to compensating load and changes the output loss and high-frequency transformer compensation of nonlinearity that cause, can further improve the precision of output signal.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the embodiment of the present invention 1.
Fig. 2 is the theory diagram of the embodiment of the present invention 2.
Fig. 3 is the circuit diagram of the embodiment of the present invention 3.
Fig. 4,5 is structural representations of the embodiment of the present invention 1.
Embodiment
Embodiment 1:
As shown in Figure 1: the oscillatory circuit be made up of bleeder circuit, many taps high-frequency transformer and precise rectification circuit are formed, bleeder circuit is by inputted high-voltage dc voltage dividing potential drop, through the oscillatory circuit conversion isolation of many taps high-frequency transformer composition, then export the voltage proportional with the high-voltage dc signal inputted or current signal through rectification circuit; The oscillatory circuit formed for many taps high-frequency transformer through the voltage division signal of bleeder circuit gained provides working power.
Embodiment 2:
As shown in Figure 2: the compensating circuit being also provided with the oscillator signal of the oscillatory circuit sampled in the voltage division signal of bleeder circuit and many taps high-frequency transformer composition on the basis of embodiment 1, described through the voltage division signal of bleeder circuit gained and the signal of oscillatory circuit for compensating circuit provides working power, voltage division signal delivers to the oscillatory circuit of many taps high-frequency transformer composition after compensating circuit compensates.Containing differentiating circuit, integrating circuit and comparator circuit in compensating circuit, mainly change the output loss and high-frequency transformer compensation of nonlinearity that cause in order to compensating load, can further improve the precision of output signal, make the signal of output more stable, more accurate.
Bleeder circuit, by electric resistance partial pressure, is provided with by stabilivolt or/and the protection circuit that forms of diode simultaneously.
Precise rectification circuit, primarily of high-frequency transformer and field effect transistor element composition, realizes the precision rectifying of signal.
Embodiment 3:
As shown in Figure 3: high voltage input terminal is INTPUT+, INTPUT-, low-voltage output is JP1.
Bleeder circuit by be connected to high input voltage terminal INTPUT+ hold current-limiting resistance Rb1 ~ Rbn, be connected to high input voltage terminal INTPUT-hold current-limiting resistance Ra1 ~ Ran form; the resistance Rc1 be in parallel, stabilivolt D4, diode D3 form protection circuit, and the positive and negative output terminal of bleeder circuit is respectively U1, U2.
Compensating circuit is provided with operational amplifier N1, the first input end of operational amplifier N1 connects with resistance R5 and resistance R8, resistance R5 is successively by resistance R1, resistance R2 connects with second input end of operational amplifier N1, electric capacity C2 is connected between second input end of operational amplifier N1 and output terminal, the output terminal of operational amplifier N1 is connected with field effect transistor Q5 by resistance R7, output one tunnel and the resistance R11 be in series of field effect transistor Q5, stabilivolt D6 connects, another road and inductance L 1, electric capacity C1 and resistance R3 connects, the other end of electric capacity C1 connects with diode D1, the other end of resistance R3 is connected to the contact of electric capacity C1 and diode D1 by resistance R4, resistance R3 connects with the negative power end of operational amplifier N1 with the contact of resistance R4, the positive power source terminal of operational amplifier N1 connects with field effect transistor Q6 and resistance R10, resistance R20 is also connected to operational amplifier N1.Resistance R8 and U1 end connects, and resistance R5 and U2 end connects.
The oscillatory circuit of many taps high-frequency transformer composition is provided with the stabilivolt D2 be in series, diode D1 and electric capacity C4, resistance R14 is parallel with electric capacity C4, the contact of electric capacity C4 and resistance R14 is by resistance R6, field effect transistor Q3 connects with one end of the former limit winding T1-Y1 of many taps high-frequency transformer T1, resistance R14 is by resistance R12, field effect transistor Q1 connects with the other end of the former limit winding T1-Y1 of many taps high-frequency transformer T1, field effect transistor Q3 connects with field effect transistor Q1, resistance R12 is also connected with one end of many taps high-frequency transformer T1 former limit winding T1-Y2 by resistance R9, the other end and the resistance R6 of former limit winding T1-Y2 connect with the contact of field effect transistor Q3.Many taps high-frequency transformer T1 is made up of many taps winding, has corresponding Same Name of Ends, and be divided into former limit winding and time limit winding, former time limit separates coiling, plays a part high-low pressure isolation.Electric capacity C4 is with resistance R14's and contact holds with U1 and stabilivolt D6 connects, and field effect transistor Q3 connects with inductance L 1 with the phase contact of field effect transistor Q1.
Precise rectification circuit is made up of secondary winding T1-C1, the T1-C2 of many taps high-frequency transformer T1, triode Q4, field effect transistor Q2, Q7, inductance L 2, electric capacity C3 and resistance R13, the two ends of the secondary winding T1-C1 of many taps high-frequency transformer T1 connect with field effect transistor Q2 and field effect transistor Q7 respectively, field effect transistor Q2 connects with field effect transistor Q7, the secondary winding T1-C1 centre tap of many taps high-frequency transformer T1 connects with the base stage of triode Q4 and collector, and the emitter of triode Q4 connects with the contact of field effect transistor Q2 and field effect transistor Q7; The two ends of the secondary winding T1-C2 of many taps high-frequency transformer T1 connect with field effect transistor Q2 and field effect transistor Q7 respectively, the secondary winding T1-C2 centre tap of many taps high-frequency transformer T1 connects with inductance L 2, inductance L 2 is connected with the contact of field effect transistor Q2 and field effect transistor Q7 by electric capacity C3, and inductance L 2 connects with resistance R13 with the contact of electric capacity C3.
Embodiment 4:
Structure of the present invention is as shown in Figure 4,5: be provided with base plate 1, base plate 1 is fixed with the oscillatory circuit of interior envelope many taps high-frequency transformer composition and the signal conversion module 2 of rectification circuit and signal output terminal 3, lower layer support post 4 and upper strata support column 5 is also connected at base plate 1, circuit board 6 is fixed with by screw 11 in lower layer support post 4 upper end, circuit board 6 there are bleeder circuit and signal input terminal 7, be fixed with protective shield 8 in upper strata support column 4 upper end by screw 11, circuit board 6 is connected with the connection terminal be positioned in signal conversion module 2 (10) by wiring 9.
Principle of work:
Tested high-voltage dc signal inputs from high voltage input terminal, after bleeder circuit current limliting dividing potential drop, obtains the low voltage signal (as about 50V) proportional with input end; The voltage division signal that bleeder circuit exports is respectively compensating circuit, the oscillatory circuit of many taps high-frequency transformer composition provides working power; Compensating circuit is mainly used to compensating load and changes the output loss and high-frequency transformer compensation of nonlinearity that cause; The output signal of the oscillatory circuit of many taps high-frequency transformer composition converts vibration to direct current signal through rectification circuit, and after filtering, finally by the low-voltage dc voltage signal proportional with original edge voltage signal of low-voltage output output smoothing.Voltage can be changed according to loading condition to export as electric current exports.
Claims (1)
1. a passive direct-current voltage transducer, it is characterized in that: primarily of oscillatory circuit and the precise rectification circuit formation of bleeder circuit, many taps high-frequency transformer composition, bleeder circuit is by inputted high-voltage dc voltage dividing potential drop, through the oscillatory circuit conversion isolation of many taps high-frequency transformer composition, then export the voltage proportional with the high-voltage dc signal inputted or current signal through precise rectification circuit; The oscillatory circuit formed for many taps high-frequency transformer through the voltage division signal of bleeder circuit gained provides working power;
Also be provided with the compensating circuit of the oscillator signal of the oscillatory circuit sampled in the voltage division signal of bleeder circuit and many taps high-frequency transformer composition, described through the voltage division signal of bleeder circuit gained and the oscillator signal of oscillatory circuit for compensating circuit provides working power;
Described precise rectification circuit is made up of secondary winding T1-C1, the T1-C2 of many taps high-frequency transformer T1, triode Q4, field effect transistor Q2, Q7, inductance L 2, electric capacity C3 and resistance R13, the two ends of the secondary winding T1-C1 of many taps high-frequency transformer T1 connect with field effect transistor Q2 and field effect transistor Q7 respectively, field effect transistor Q2 connects with field effect transistor Q7, the secondary winding T1-C1 centre tap of many taps high-frequency transformer T1 connects with the base stage of triode Q4 and collector, and the emitter of triode Q4 connects with the contact of field effect transistor Q2 and field effect transistor Q7; The two ends of the secondary winding T1-C2 of many taps high-frequency transformer T1 connect with field effect transistor Q2 and field effect transistor Q7 respectively, the secondary winding T1-C2 centre tap of many taps high-frequency transformer T1 connects with inductance L 2, inductance L 2 is connected with the contact of field effect transistor Q2 and field effect transistor Q7 by electric capacity C3, and inductance L 2 connects with resistance R13 with the contact of electric capacity C3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210461510.XA CN102944719B (en) | 2012-11-16 | 2012-11-16 | Passive direct-current voltage transducer |
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| CN201210461510.XA CN102944719B (en) | 2012-11-16 | 2012-11-16 | Passive direct-current voltage transducer |
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| CN102944719B true CN102944719B (en) | 2015-12-09 |
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| CN112986657B (en) * | 2021-05-07 | 2021-08-13 | 宁波中车时代传感技术有限公司 | Self-powered direct-current voltage measurement control circuit and measurement device |
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| CN2137363Y (en) * | 1992-06-23 | 1993-06-30 | 南昌有色冶金设计研究院 | Dc voltage isolated measuring device |
| CN2257104Y (en) * | 1995-08-17 | 1997-06-25 | 洪德全 | Frequency-changing isolation reducing transformer |
| JP3765026B2 (en) * | 1997-12-08 | 2006-04-12 | 三菱電機株式会社 | Discharge lamp dimming lighting device |
| CN100346363C (en) * | 2005-09-08 | 2007-10-31 | 广州汉为电子科技有限公司 | Passive electromagnetic isolated signal converter |
| CN201369302Y (en) * | 2009-02-06 | 2009-12-23 | 湘潭电机股份有限公司 | Direct-current electromagnetic high-speed breaker |
| CN102175903B (en) * | 2011-02-23 | 2013-06-19 | 湘潭电机股份有限公司 | Passive isolated direct current (DC) voltage detection device for urban railway vehicle |
| CN102262174A (en) * | 2011-04-29 | 2011-11-30 | 大连丰和电力科技有限公司 | Voltage sensor |
| CN202994884U (en) * | 2012-11-16 | 2013-06-12 | 大连丰和日丽电气有限公司 | Passive DC voltage sensor |
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