Precision AC Current Amplifier
A technology of alternating current and current amplification, applied in the direction of power amplifiers, etc., to achieve the effects of low cost, high power utilization and high accuracy
Active Publication Date: 2017-06-16
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0009] The technical problem to be solved by the present invention is to provide an improved precision AC current amplifier for the shortcomings of the existing AC current amplification technology, which can perform high-accuracy real-time proportional amplification of small-signal AC standard current sources, and has good amplitude Value gain stability and phase stability, thus providing conditions and guarantees for high-accuracy calibration of power test instruments with large current measurement capabilities
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[0018] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.
[0019] Explanation of labels in each figure: A, B—input port, C, D—output port, U1—current amplification circuit operational amplifier, U2—integrating circuit operational amplifier, T1—current step-up transformer, T2—current transformer, R1— Integral circuit resistance, R2, R3—low-pass filter circuit resistance, C1—high-frequency filter capacitor, C2—integrating capacitor, C3—low-pass filter circuit capacitor, GND—reference ground potential point.
[0020] The invention provides a precision AC current amplifier, which can perform high-accuracy real-tim...
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The invention relates to a precision AC current amplifier, which can perform high-accuracy real-time proportional amplification of an AC standard current source, and has good amplitude gain stability and phase stability. It includes input and output ports, current amplification circuit, DC clamp circuit, high frequency filter circuit. The current amplification circuit consists of an operational amplifier, a transformer and a current transformer to form an AC current negative feedback loop, and realizes high-accuracy amplification of an AC standard current source within the working frequency band. The DC clamping circuit is composed of an integrating circuit and a low-pass filter circuit, and is used to eliminate the non-linear influence of the transformer and current transformer in DC. The high-frequency filter circuit is used to prevent the current amplification circuit from oscillating. The invention has the advantages of low cost, real-time response, high accuracy, current output circuit isolation, high power utilization rate and the like.
Description
technical field [0001] The invention relates to a precision AC current amplifier, which belongs to the field of calibration, verification and detection of electric testing instruments, and in particular to a device capable of amplifying an AC standard current source with high accuracy. Background technique [0002] In the calibration, verification and testing of electrical testing instruments with large current measurement capabilities, it is often necessary to provide a high current AC standard current source with an output current of tens of amperes. Low-current AC standard sources are relatively easy to obtain, but low-cost, high-accuracy high-current AC standard current sources are not easy to obtain. [0003] The high-current AC standard current source is generally realized by the small current AC standard source through the AC current amplifier. In order to make the output current reach tens of amps, the traditional AC current amplifier mainly has the following method...
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IPC IPC(8): H03F3/20
Inventor 付济良王旭王斯琪周玮匡义徐晨
Owner STATE GRID CORP OF CHINA