AC power source current output stabilization and converting circuit, converter and conversion method

Abstract

The invention relates to an AC power source converting circuit, a converter and a converting method with stable current output. The converting circuit comprises an AC current source, a current transformer, a first change-over switch and a transformer for reducing current; the converter comprises an AC current source, a current transformer, an output switch, a transformer for reducing current, a current sampler and a sampling amplifier; the converting method comprises the steps that current is output to the current transformer by the AC current source; the current with different values is output by the current transformer; if the current output is low, the current transformer outputs a fixed current which is converted to low current with the same power by the transformer for reducing current; the transformer for reducing current converts the low current with the same power to stable low current which is output by the current output end and fed back to the AC current source after being sampled and amplified. The conversion circuit, the converter and the converting method of the invention guarantees that the output stability of the low current is not interfered by the power source when the current power source outputs the current with different values; meanwhile, the technical index of the low current output by the transformers with the same volume is completely consistent with the high current.

Description

technical field [0001] The invention belongs to the field of current regulation and control, and relates to a conversion circuit, a converter and a conversion method for stably adjusting the output current of an AC power source, in particular to a method for outputting a mA-level small current from an AC power source or an AC standard source. An AC power source current output stable conversion circuit, a converter and a conversion method that realize anti-electromagnetic interference, low-temperature drift, and current output stability and accuracy adjustment. Background technique [0002] With the advancement of science and technology, the development of power electronics is changing with each passing day, and the supporting power equipment is also being widely used. However, with the continuous increase of power electronic equipment, the defects of power supply quality are becoming more and more serious, which will inevitably require the performance of electrical equipment...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, after the current is transformed by the current transformer, the output current value has a large span. When such large and small currents are mixed and output on the same transformer, the smaller the output current is under the condition that the influence of the power output ripple is certain, the smaller the output current will be. The greater the influence of the ripple, the lower the current stability is when the output current is 10mA. The smaller the current is, the more the number of turns of the secondary wire package will be, resulting in a larger volume of the current transformer, resulting in a large increase in production costs and other technical problems. The invention provides an AC power source current output stable conversion circuit and conversion device

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