CN110333383A - Single-phase AC voltage high-precision quick detection circuit based on mutual inductor - Google Patents

Single-phase AC voltage high-precision quick detection circuit based on mutual inductor Download PDF

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Publication number
CN110333383A
CN110333383A CN201910753691.5A CN201910753691A CN110333383A CN 110333383 A CN110333383 A CN 110333383A CN 201910753691 A CN201910753691 A CN 201910753691A CN 110333383 A CN110333383 A CN 110333383A
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resistance
voltage
capacitor
rms
output
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CN201910753691.5A
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CN110333383B (en
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陈德传
丁禹心
陈雪亭
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Hangzhou Dianzi University
Hangzhou Electronic Science and Technology University
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Hangzhou Electronic Science and Technology University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only

Abstract

The invention belongs to industrial measurement and control fields, are related to a kind of single-phase AC voltage high-precision quick detection circuit based on mutual inductor, suitable for all kinds of applications for needing to carry out single-phase AC voltage virtual value high-precision real-time monitoring and control.Circuit of the present invention includes voltage transformer VS1, RMS/DC conversion chip IC1, amplifier IC2, fuse FU1, upper divider resistance R1, lower divider resistance R2, output filter resistance R3, anode resistance R4, negative terminal resistance R5, feedback resistance R6, input filter capacitor C1, capacitance C2, translation filtering capacitor C3, anode capacitor C4, feedback capacity C5, power capacitor C6 etc..The circuit is made of single-phase potential transformer, RMS/DC conversion chip and operational amplifier etc., can high-precision, wide scope, in real time the detection effective value signal of single-phase AC voltage.The circuit is simple, at low cost, high reliablity, versatility are good, is easy to commercialization.

Description

Single-phase AC voltage high-precision quick detection circuit based on mutual inductor
Technical field
The invention belongs to industrial measurement and control fields, are related to a kind of circuit, in particular to a kind of single phase ac based on mutual inductor Voltage high accuracy quick detection circuit, suitable for it is all kinds of need to single-phase AC voltage virtual value carry out high-precision real-time monitoring with The application of control.
Background technique
In the types of applications system using single-phase alternating current power supply, detection alternating voltage virtual value is required, often at present Single-phase AC voltage detection scheme mainly has two major classes: one is rectified based on single-phase potential transformer and diode bridge Single-phase AC voltage is transformed into approximate d. c. voltage signal and exported by the scheme of filter circuit;Another kind is based on Hall electricity The scheme of pressure sensor.But the following problems exist respectively for the two current schemes: first is that being based on single-phase potential transformer and two poles The scheme of pipe bridge rectifier filter circuit, although simple and reliable, since diode bridge rectifier circuit has droop loss, not only There are the non-linear of detection and detection accuracy is influenced, reference voltage detection is also limited, in addition, there is also biggish detections Hysteresis quality.Second is that the scheme based on Hall voltage sensor is limited its scope of application due to expensive.Therefore, how to set Count a kind of alternating voltage RMS to DC that the high performance-price ratio that high-precision quickly detects is able to achieve based on single-phase potential transformer Circuit arrangement undoubtedly has a good application prospect, this is also starting point of the invention.
Summary of the invention
The purpose of the present invention is in view of the deficienciess of the prior art, proposing a kind of single-phase AC voltage based on mutual inductor High-precision quick detection circuit.The circuit is made of single-phase potential transformer, RMS/DC conversion chip and operational amplifier etc., energy In high precision, wide scope, in real time the detection effective value signal of single-phase AC voltage.
Single-phase AC voltage high-precision quick detection circuit based on mutual inductor includes that voltage transformer VS1, RMS/DC turn Change chip IC 1, amplifier IC2, fuse FU1, upper divider resistance R1, lower divider resistance R2, output filter resistance R3, anode resistance R4, negative terminal resistance R5, feedback resistance R6, input filter capacitor C1, capacitance C2, translation filtering capacitor C3, anode capacitor C4, The end first input end AC1 of feedback capacity C5, power capacitor C6, voltage transformer VS1 are connect with one end of fuse FU1, are melted The other end of disconnected device FU1 and one end end ACL1 of test line connect, the second end input terminal AC2 of voltage transformer VS1 and quilt The end other end ACL2 on survey line road connects, the first end output end OUT1 of voltage transformer VS1 and one end of upper divider resistance R1 Connection, the other end of upper divider resistance R1 and one end of lower divider resistance R2, one end of input filter capacitor C1, RMS/DC are converted The end positive input terminal IN+ of chip IC 1 connects, the end second output terminal OUT2 of voltage transformer VS1, lower divider resistance R2 it is another End, the other end of input filter capacitor C1, capacitance C2 one end be grounded, the other end of capacitance C2 and RMS/DC turn Change the end the negative input end IN- connection of chip IC 1, the end positive output end OUT+ of RMS/DC conversion chip IC1 and output filter resistance One end connection of one end, translation filtering capacitor C3 of R3, enable end/end EN of RMS/DC conversion chip IC1, negative power end-V End, the end ground terminal GND, the end negative output terminal OUT- are grounded, and the end positive power source terminal+V of RMS/DC conversion chip IC1 is with amplifier IC2's The end positive power source terminal+V, one end of power capacitor C6, the circuit power end end+VCC connection, export filter resistance R3 the other end with just Hold the end the positive input terminal IN+ connection of one end of capacitor C4, one end of anode resistance R4, amplifier IC2, the negative input end of amplifier IC2 The end IN- is connect with one end of one end of negative terminal resistance R5, one end of feedback resistance R6, feedback capacity C5, and negative terminal resistance R5's is another One end, the other end of anode resistance R4, the other end of anode capacitor C4, translation filtering capacitor C3 the other end be grounded, feed back The other end of resistance R6 and the other end of feedback capacity C5 connect with the output end OUT terminal of amplifier IC2, the end circuit output end Uout It connects, the end-V ground connection of amplifier IC2.
Beneficial effects of the present invention are as follows:
Detection circuit scheme of the present invention based on RMS/DC conversion chip, operational amplifier etc., can fully meet base High-precision, the requirement of the real-time detection of wide scope in the single-phase AC voltage virtual value of single-phase potential transformer.The circuit is simple, At low cost, high reliablity, versatility are good, are easy to commercialization.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
As shown in Figure 1, the single-phase AC voltage high-precision quick detection circuit based on mutual inductor.
Single-phase AC voltage high-precision quick detection circuit based on mutual inductor includes that voltage transformer VS1, RMS/DC turn Change chip IC 1, amplifier IC2, fuse FU1, upper divider resistance R1, lower divider resistance R2, output filter resistance R3, anode resistance R4, negative terminal resistance R5, feedback resistance R6, input filter capacitor C1, capacitance C2, translation filtering capacitor C3, anode capacitor C4, The 1st end input terminal AC1 of feedback capacity C5, power capacitor C6, voltage transformer VS1 are connect with one end of fuse FU1, fusing One end end ACL1 of the other end of device FU1 and test line connects, the 2nd end input terminal AC2 of voltage transformer VS1 with by survey line The end other end ACL2 on road connects, and the 1st end output end OUT1 of voltage transformer VS1 is connect with one end of upper divider resistance R1, One end, one end of input filter capacitor C1, RMS/DC conversion chip of the other end of upper divider resistance R1 and lower divider resistance R2 The end positive input terminal IN+ of IC1 connects, the 2nd end output end OUT2 of voltage transformer VS1, lower divider resistance R2 the other end, defeated One end of the other end, capacitance C2 that enter filter capacitor C1 is grounded, and the other end and RMS/DC of capacitance C2 converts core The end negative input end IN- of piece IC1 connects, and the end positive output end OUT+ of RMS/DC conversion chip IC1 is with output filter resistance R3's One end connection of one end, translation filtering capacitor C3, enable end/end EN of RMS/DC conversion chip IC1, the end negative power end-V, The end end GND, the end negative output terminal OUT- are grounded, the end positive power source terminal+V of RMS/DC conversion chip IC1 and the positive supply of amplifier IC2 The end end+V, one end of power capacitor C6, the connection of the circuit power end end+VCC, export the other end and anode capacitor of filter resistance R3 One end of C4, one end of anode resistance R4, amplifier IC2 the end positive input terminal IN+ connection, the end negative input end IN- of amplifier IC2 with One end connection of one end of negative terminal resistance R5, one end of feedback resistance R6, feedback capacity C5, the other end of negative terminal resistance R5, just The other end of the other end of resistance R4, the other end of anode capacitor C4, translation filtering capacitor C3 is held to be grounded, feedback resistance R6's The other end of the other end and feedback capacity C5 are connect with the output end OUT terminal of amplifier IC2, the end circuit output end Uout, amplifier The end-V of IC2 is grounded.
It is used in the present invention all including voltage transformer VS1, RMS/DC conversion chip IC1, amplifier IC2 etc. Device is all made of existing matured product, can be obtained by market.Such as: voltage transformer VS1 is using JDG series, RMS/ DC chip uses LTC1968, and amplifier is using TLC4501 etc..
Main circuit parameter matching relationship in the present invention is as follows:
The output signal of voltage transformer VS1 is u2=kvux(unit: V),For tested list Phase alternating voltage (unit: V), UxFor tested single-phase AC voltage virtual value (unit: V), kvFor the inscription of voltage transformer VS1 Board parameter no-load voltage ratio.
R3=R5 (2)
R4=R6 (3)
Uoutmax≤Vcc (5)
R in formula1、R2For the resistance value (unit: Ω) of upper divider resistance R1, lower divider resistance R2, R3、R4、R5、R6Respectively Export the resistance value (unit: Ω) of filter resistance R3, anode resistance R4, negative terminal resistance R5, feedback resistance R6, UxmaxFor measured voltage Maximum virtual value (unit: V), Uout、UoutmaxCircuit output respectively of the present invention voltage signal and its maximum value (unit: V), VccFor circuit voltage value (unit: V).
Formula (6) is the relational expression between circuit output voltage signal and measured voltage virtual value of the present invention.
The course of work of the present invention is as follows:
In Fig. 1, voltage transformer VS1 output and measured voltageDirectly proportional voltageThe voltage through upper divider resistance R1, lower divider resistance R2 partial pressure after voltage signalIt is input to RMS/DC chip IC 1, the output of RMS/DC chip IC 1 is exactly ua(t) have Valid value(unit: V), effective value signal using amplifier IC2 after the filter and amplification of core through being exported The voltage signal directly proportional to measured voltage virtual value as shown in formula (6).Because to avoid diode bridge whole for circuit of the present invention Stream and power frequency filter circuit, it is achieved that based on single-phase potential transformer to the high-precision of single-phase AC voltage virtual value, fast Fast detection function.

Claims (3)

1. the single-phase AC voltage high-precision quick detection circuit based on mutual inductor, it is characterised in that including voltage transformer VS1, RMS/DC conversion chip IC1, amplifier IC2, fuse FU1, upper divider resistance R1, lower divider resistance R2, output filter resistance R3, Anode resistance R4, negative terminal resistance R5, feedback resistance R6, input filter capacitor C1, capacitance C2, translation filtering capacitor C3, just Hold capacitor C4, feedback capacity C5, power capacitor C6, the one end at the 1st end input terminal AC1 and fuse FU1 of voltage transformer VS1 Connection, the other end of fuse FU1 and one end end ACL1 of test line connect, the 2nd input terminal AC2 of voltage transformer VS1 End is connect with the end other end ACL2 of test line, and the 1st end output end OUT1 of voltage transformer VS1 is with upper divider resistance R1's One end connection, one end, one end of input filter capacitor C1, RMS/DC of the other end of upper divider resistance R1 and lower divider resistance R2 The end positive input terminal IN+ of conversion chip IC1 connects, the 2nd end output end OUT2 of voltage transformer VS1, lower divider resistance R2 The other end, the other end of input filter capacitor C1, capacitance C2 one end be grounded, the other end and RMS/ of capacitance C2 The end negative input end IN- of DC conversion chip IC1 connects, and the end positive output end OUT+ of RMS/DC conversion chip IC1 and output filter One end connection of one end, translation filtering capacitor C3 of resistance R3, enable end/end EN, negative supply of RMS/DC conversion chip IC1 The end end-V, the end ground terminal GND, the end negative output terminal OUT- are grounded, the end positive power source terminal+V of RMS/DC conversion chip IC1 and amplifier The end positive power source terminal+V of IC2, one end of power capacitor C6, the connection of the circuit power end end+VCC, output filter resistance R3's is another End is connect with the end positive input terminal IN+ of one end of anode capacitor C4, one end of anode resistance R4, amplifier IC2, and amplifier IC2's is negative The end input terminal IN- is connect with one end of one end of negative terminal resistance R5, one end of feedback resistance R6, feedback capacity C5, negative terminal resistance The other end of R5, the other end of anode resistance R4, the other end of anode capacitor C4, translation filtering capacitor C3 the other end connect The other end of ground, the other end of feedback resistance R6 and feedback capacity C5 with output end OUT terminal, the circuit output end of amplifier IC2 The connection of the end Uout, the end-V ground connection of amplifier IC2.
2. the single-phase AC voltage high-precision quick detection circuit according to claim 1 based on mutual inductor, feature exist It is as follows in circuit parameter matching relationship:
If: the output signal of voltage transformer VS1 is u2=kvux,For tested single-phase AC voltage, UxFor tested single-phase AC voltage virtual value, kvFor the nameplate parameter no-load voltage ratio of voltage transformer VS1;
R3=R5 (2)
R4=R6 (3)
Uoutmax≤Vcc (5)
R in formula1、R2For the resistance value of upper divider resistance R1, lower divider resistance R2, R3、R4、R5、R6Respectively export filter resistance The resistance value of R3, anode resistance R4, negative terminal resistance R5, feedback resistance R6, UxmaxFor the maximum virtual value of measured voltage, Uout、 UoutmaxThe respectively voltage signal and its maximum value of circuit output, VccFor circuit voltage value;Formula (6) is circuit output Relational expression between voltage signal and measured voltage virtual value.
3. the single-phase AC voltage high-precision quick detection circuit according to claim 1 or 2 based on mutual inductor, feature It is that voltage transformer VS1, RMS/DC conversion chip IC1, amplifier IC2 are all made of existing matured product;Voltage transformer VS1 Using JDG series, RMS/DC conversion chip IC1 uses LTC1968, amplifier IC2 to use TLC4501.
CN201910753691.5A 2019-08-15 2019-08-15 Single-phase alternating-current voltage high-precision rapid detection circuit based on mutual inductor Active CN110333383B (en)

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Citations (11)

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Publication number Priority date Publication date Assignee Title
CN101915895A (en) * 2010-07-13 2010-12-15 杭州电子科技大学 Dynamic potential detection circuit for DC motor
CN202340218U (en) * 2011-11-29 2012-07-18 中国航空工业集团公司第六三一研究所 Alternating current voltage signal preprocessing circuit for analogue circuit
CN102735399A (en) * 2012-07-12 2012-10-17 杭州电子科技大学 Flywheel inertia detection circuit of direct current motor
CN102735944A (en) * 2012-07-12 2012-10-17 杭州电子科技大学 Direct-current motor armature inductance detection circuit
CN103941078A (en) * 2014-04-02 2014-07-23 云南大学 High-precision multi-path alternating current true virtual value detection circuit
CN204575726U (en) * 2015-04-02 2015-08-19 江门职业技术学院 A kind of LED drive power detection system and equipment
CN106019020A (en) * 2016-06-30 2016-10-12 新疆特变电工自控设备有限公司 Detection method for voltage fluctuation of electric energy quality
CN205844397U (en) * 2016-07-15 2016-12-28 广东美的暖通设备有限公司 The detection device of alternating voltage
CN106707012A (en) * 2017-01-19 2017-05-24 深圳市泛海三江电子股份有限公司 AC signal acquisition circuit
CN208421196U (en) * 2018-07-31 2019-01-22 珠海市运泰利自动化设备有限公司 A kind of ripple effective value measurement device for test equipment
CN209070006U (en) * 2018-09-29 2019-07-05 宁波中车时代传感技术有限公司 A kind of current sensor

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101915895A (en) * 2010-07-13 2010-12-15 杭州电子科技大学 Dynamic potential detection circuit for DC motor
CN202340218U (en) * 2011-11-29 2012-07-18 中国航空工业集团公司第六三一研究所 Alternating current voltage signal preprocessing circuit for analogue circuit
CN102735399A (en) * 2012-07-12 2012-10-17 杭州电子科技大学 Flywheel inertia detection circuit of direct current motor
CN102735944A (en) * 2012-07-12 2012-10-17 杭州电子科技大学 Direct-current motor armature inductance detection circuit
CN103941078A (en) * 2014-04-02 2014-07-23 云南大学 High-precision multi-path alternating current true virtual value detection circuit
CN204575726U (en) * 2015-04-02 2015-08-19 江门职业技术学院 A kind of LED drive power detection system and equipment
CN106019020A (en) * 2016-06-30 2016-10-12 新疆特变电工自控设备有限公司 Detection method for voltage fluctuation of electric energy quality
CN205844397U (en) * 2016-07-15 2016-12-28 广东美的暖通设备有限公司 The detection device of alternating voltage
CN106707012A (en) * 2017-01-19 2017-05-24 深圳市泛海三江电子股份有限公司 AC signal acquisition circuit
CN208421196U (en) * 2018-07-31 2019-01-22 珠海市运泰利自动化设备有限公司 A kind of ripple effective value measurement device for test equipment
CN209070006U (en) * 2018-09-29 2019-07-05 宁波中车时代传感技术有限公司 A kind of current sensor

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