CN103151993B - Accurate alternating current amplifier - Google Patents

Accurate alternating current amplifier Download PDF

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Publication number
CN103151993B
CN103151993B CN201310035236.4A CN201310035236A CN103151993B CN 103151993 B CN103151993 B CN 103151993B CN 201310035236 A CN201310035236 A CN 201310035236A CN 103151993 B CN103151993 B CN 103151993B
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China
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current
circuit
transformer
operational amplifier
amplifier
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CN201310035236.4A
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CN103151993A (en
Inventor
付济良
王旭
王斯琪
周玮
匡义
徐晨
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The present invention relates to a kind of accurate alternating current amplifier, the real-time equal proportion of high accuracy can be carried out to exchange normalized current source and is amplified, with good amplitude gain stability and phase stability.It includes input/output port, current amplification circuit, direct current clamp circuit, high-frequency filter circuit.Current amplification circuit constitutes alternating current negative feedback loop by operational amplifier, transformer summation current transformer, in working frequency range, realizes that the high accuracy in exchange normalized current source is amplified.Direct current clamp circuit is made up of integrating circuit and low-pass filter circuit, for non-linear effects of the eliminating transformer summation current transformer in direct current.High-frequency filter circuit is used to prevent current amplification circuit from vibrating.The present invention has the advantages that low cost, real-time response, the degree of accuracy high, the isolation of electric current output loop, power utilization are high.

Description

Accurate alternating current amplifier
Technical field
The present invention relates to a kind of accurate alternating current amplifier, belong to calibration, calibrating and the detection to power test instrument Field, more particularly to a kind of device that high accuracy amplification can be carried out to exchange normalized current source.
Background technology
In the calibration to the power test instrument with Super-Current Measurement ability, calibrating and detecting work, generally require The high current exchange normalized current source that output current is up to tens amperes is provided.Low current exchange standard source is easier to obtain, and Low cost, the high current of high accuracy exchange normalized current source are but difficult to obtain.
High current exchange normalized current source, typically exchanges standard source and is realized by alternating current amplifier by low current.For Output current is set to reach tens amperes, traditional alternating current amplifier mainly there are following several ways.
Programmable amplifier, transformer, micro processor combination mode:Signal expands stream, passes through through preposition programming amplifying, transformer Current sample, microprocessor adjusts programmable amplifier gain after calculating, and makes outputting current steadily in setting value.Which signal source With amplifier one, it is necessary to microprocessor coordinates, complex structure high to each circuit element stability requirement, underaction, and it is defeated Going out electric current regulation has hysteresis quality.
Operational amplifier, power tube combination:Which needs fan-out capability up to tens amperes of high current power tube And power supply, power consumption is big, and zero crossing intermodulation distortion is not easily overcome.
Great current operation amplifier type of drive:Which need fan-out capability up to tens amperes great current operation amplify Device and power supply, high cost, power consumption are big.
Precision current transformer expands stream mode:Precision current transformer structure bulky needed for which, high cost, and band is negative Loading capability is weak.
In view of this, it is necessary to which a kind of accurate alternating current amplifier is provided, height can be carried out to low current exchange standard source The real-time equal proportion of the degree of accuracy is amplified, to meet commercial Application needs.
The content of the invention
The technical problems to be solved by the invention are:For the deficiency of existing alternating current amplifying technique, there is provided Yi Zhonggai The accurate alternating current amplifier for entering, can carry out the real-time equal proportion of high accuracy and amplify to small-signal exchange normalized current source, With good amplitude gain stability and phase stability, so as to be the power test quasi-instrument for possessing Super-Current Measurement ability High accuracy verifying work provide condition and guarantee.
The technical solution adopted in the present invention is:A kind of accurate alternating current amplifier, is put by input/output port, electric current Big circuit, direct current clamp circuit, high-frequency filter circuit are constituted, it is characterised in that:
The current amplification circuit, including the first operational amplifier, transformer, current transformer;First operational amplifier U1 reverse input ends connect current input terminal mouthful, and its output connects transformer inputs;Transformer output end series current transformer connects Current output terminal mouthful;Current transformer output connects the first operational amplifier reverse input end;
The direct current clamp circuit, including the second operational amplifier, resistance, electric capacity;Second operational amplifier U2 and resistance R1, electric capacity C2 constitute integrating circuit;Resistance R2, R3 and electric capacity C3 composition low-pass filter circuits;Integrating circuit input connects electric current and puts First operational amplifier output terminal of big circuit, output connects low-pass filter circuit input;Low-pass filter circuit output connects electric current First operational amplifier positive input of amplifying circuit;
The high-frequency filter circuit, including electric capacity C1;Electric capacity C1 mono- terminates the first operational amplifier of current amplification circuit Output end, the first operational amplifier inverting input of another termination current amplification circuit.
Precision alternating current amplifier as described above, it is characterised in that the first computing of the current amplification circuit is put Big device is great current operation amplifier;Transformer is rising current transformer;Current transformer is instrument precision alternating current mutual inductance Device.
Precision alternating current amplifier as described above, it is characterised in that the current amplification circuit input and signal Can also connect a precision resistance between source, make exchange standard voltage source can be used as being input into standard source.
The beneficial effects of the invention are as follows:In addition to rising current transformer output loop is high current, circuit other parts element bag Include power supply and be operated in low current condition, power utilization is high, low cost;Output current with input current signal real-time change, Output current wave and phase are mainly determined that the degree of accuracy is high by precision current transformer.In electric current output loop and circuit other Element electrical isolation, can effective protection circuit element, and in the absence of the problem with load altogether.
Brief description of the drawings
Fig. 1 is the circuit theory schematic diagram of precision alternating current amplifier of the invention.
Specific embodiment
For a better understanding of the present invention, it is with reference to the embodiment content that the present invention is furture elucidated but of the invention Content is not limited solely to the following examples.Those skilled in the art can make various changes or modifications to the present invention, these The equivalent form of value is same within the scope of claims listed by the application are limited.
The explanation of label in each figure:A, B-input port, C, D-output port, U1-current amplification circuit operation amplifier Device, U2-integrating circuit operational amplifier, T1-rising current transformer, T2-current transformer, R1-integrating circuit resistance, R2, R3-low-pass filter circuit resistance, C1-high-frequency filter capacitor, C2-integrating capacitor, C3-low-pass filter circuit electric capacity, GND- Ground reference point.
The present invention provides a kind of accurate alternating current amplifier, and high accuracy can be carried out to exchange normalized current source in real time etc. It is scaling, with good amplitude gain stability and phase stability.It includes input/output port, Current amplifier electricity Road, direct current clamp circuit, high-frequency filter circuit.Current amplification circuit is made up of operational amplifier, transformer summation current transformer Alternating current negative feedback loop, in working frequency range, realizes that the high accuracy in exchange normalized current source is amplified.Direct current clamp circuit It is made up of integrating circuit and low-pass filter circuit, for non-linear effects of the eliminating transformer summation current transformer in direct current. High-frequency filter circuit is used to prevent current amplification circuit from vibrating.
As shown in figure 1, a kind of accurate alternating current amplifier, by input/output port, current amplification circuit, direct current clamper Circuit, high-frequency filter circuit are constituted, it is characterised in that:
The current amplification circuit, is related to operational amplifier U1, transformer, current transformer;Operational amplifier U1 is reverse Input termination current input terminal mouthful, its output connects transformer inputs;It is defeated that transformer output end series current transformer connects electric current Exit port;Current transformer output connects operational amplifier U1 reverse input ends;
The direct current clamp circuit, is related to operational amplifier U2, resistance, electric capacity;Operational amplifier U2 and resistance R1, electric capacity C2 constitutes integrating circuit;Resistance R2, R3 and electric capacity C3 composition low-pass filter circuits;Integrating circuit input connects current amplification circuit fortune Amplifier U1 output ends are calculated, output connects low-pass filter circuit input;Low-pass filter circuit output connects current amplification circuit computing Amplifier U1 positive inputs;
The high-frequency filter circuit, is related to electric capacity;Electric capacity one terminates current amplification circuit operational amplifier U1 output ends, separately One termination current amplification circuit operational amplifier U1 inverting inputs.
Precision alternating current amplifier as described above, it is characterised in that the operational amplifier of the current amplification circuit It is great current operation amplifier;Transformer is rising current transformer;Current transformer is instrument precision AC current transformer.
Precision alternating current amplifier as described above, it is characterised in that the current amplification circuit input and signal Can also connect a precision resistance between source, then small-signal exchange standard voltage source can be converted into high current exchange normalized current source.
Operation principle of the invention is:Operational amplifier U1, transformer T1 summation current transformers T2 composition alternating current are born Feedback circuit.In alternate current operation frequency range:Operational amplifier output current ability is Im, transformer T1 outputs and input current ratio It is N to be worth, then amplifier current fan-out capability is N*Im;It is K that current transformer is exported with input current ratio, then amplifier output Electric current Io is with the relational expression of input current Ii:Io=Ii/K.
Because transformer T1, current transformer T2 are non-linear element, direct current signal cannot pass through, and high-frequency signal can then be produced Life additional phase shift high, so that increase DC feedback and high frequency feedback loop, to ensure amplifier circuit normal work.For this Increase direct current clamp circuit and high-frequency filter circuit.Direct current clamp circuit is made up of integrating circuit and low-pass filter circuit so that Operational amplifier U1 output end DC level clampers are in ground potential points, and AC signal is then barely affected in working frequency range. High-frequency filter circuit makes high fdrequency component directly feed back to operational amplifier U1 reverse input ends by electric capacity C1, to avoid amplifier Circuit oscillation.
The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.

Claims (3)

1. a kind of accurate alternating current amplifier, is filtered by input/output port, current amplification circuit, direct current clamp circuit, high frequency Wave circuit is constituted, it is characterised in that:
The current amplification circuit, including the first operational amplifier, transformer, current transformer;First operational amplifier U1 is anti- To input termination current input terminal mouthful, its output connects transformer inputs;Transformer output end series current transformer connects electric current Output port;Current transformer output connects the first operational amplifier reverse input end;
The direct current clamp circuit, including the second operational amplifier, resistance, electric capacity;Second operational amplifier U2 and resistance R1, electricity Hold C2 composition integrating circuit;Resistance R2, R3 and electric capacity C3 composition low-pass filter circuits;Integrating circuit input connects current amplification circuit The first operational amplifier output terminal, output connect low-pass filter circuit input;Low-pass filter circuit output connects Current amplifier electricity The first operational amplifier positive input on road;
The high-frequency filter circuit, including electric capacity C1;The first operational amplifier output of the termination current amplification circuits of electric capacity C1 mono- End, the first operational amplifier inverting input of another termination current amplification circuit.
2. accurate alternating current amplifier according to claim 1, it is characterised in that the first of the current amplification circuit Operational amplifier is great current operation amplifier;Transformer is rising current transformer;Current transformer is instrument precision alternating current Current transformer.
3. accurate alternating current amplifier according to claim 1, it is characterised in that the current amplification circuit input Also connected between signal source a precision resistance, make exchange standard voltage source can be used as being input into standard source.
CN201310035236.4A 2013-01-30 2013-01-30 Accurate alternating current amplifier Active CN103151993B (en)

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Application Number Priority Date Filing Date Title
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CN201310035236.4A CN103151993B (en) 2013-01-30 2013-01-30 Accurate alternating current amplifier

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CN103151993B true CN103151993B (en) 2017-06-16

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104410374A (en) * 2014-09-29 2015-03-11 国家电网公司 Precise alternating voltage amplifier
CN105278599B (en) * 2015-10-22 2017-02-22 国家电网公司 Voltage-controlled current source circuit using CT to replace current sensing resistor
CN107017851A (en) * 2016-01-28 2017-08-04 江苏省电力公司南京供电公司 A kind of current power amplifying circuit
CN107017850A (en) * 2016-01-28 2017-08-04 江苏省电力公司南京供电公司 A kind of voltage power amplifying circuit
CN106353558A (en) * 2016-08-26 2017-01-25 成都鑫豪斯电子探测技术有限公司 The co-signal processor of inductive load and resistive load used for electrical fire supervision
CN107192973A (en) * 2017-05-27 2017-09-22 中国电力科学研究院 Leakage current of an arrester compensation system and method under a kind of electric field environment

Citations (4)

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Publication number Priority date Publication date Assignee Title
US5696441A (en) * 1994-05-13 1997-12-09 Distribution Control Systems, Inc. Linear alternating current interface for electronic meters
CN102185555A (en) * 2010-12-28 2011-09-14 上海智大电子有限公司 Digitalized alternating-current voltage and speed regulation device
CN102841227A (en) * 2012-08-15 2012-12-26 广东电网公司电力科学研究院 High precision large alternating current output device
CN203193573U (en) * 2013-01-30 2013-09-11 中国电力科学研究院 Precise alternating current amplifier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5696441A (en) * 1994-05-13 1997-12-09 Distribution Control Systems, Inc. Linear alternating current interface for electronic meters
CN102185555A (en) * 2010-12-28 2011-09-14 上海智大电子有限公司 Digitalized alternating-current voltage and speed regulation device
CN102841227A (en) * 2012-08-15 2012-12-26 广东电网公司电力科学研究院 High precision large alternating current output device
CN203193573U (en) * 2013-01-30 2013-09-11 中国电力科学研究院 Precise alternating current amplifier

Non-Patent Citations (2)

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Title
用于小电流测量的电子式电流互感器的研究与设计;邸志刚;《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》;20050915;C042-98 *
直流输电用零磁通直流电流互感其的研制;李鹤等;《高压电技术》;20121130;第38卷(第11期);2981-2985 *

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