Magnetic amplifier based switch power supply self-feedback circuit and control method therefor

A magnetic amplifier, switching power supply technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve problems such as unfavorable product miniaturization, large space occupation, etc., to improve the overall efficiency, Effects of reduced power loss and simple structure

Inactive Publication Date: 2016-03-23
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution uses a large number of components and takes up a lot of space, which is not conducive to product miniaturization

Method used

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  • Magnetic amplifier based switch power supply self-feedback circuit and control method therefor
  • Magnetic amplifier based switch power supply self-feedback circuit and control method therefor

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing:

[0022] Such as figure 1 As shown, the switching power supply self-feedback circuit based on the magnetic amplifier of this embodiment includes a transformer T1, an output rectification filter circuit 1, an error amplifier circuit 2, a reset control circuit 3 and a magnetic amplifier 4, and the output rectification filter circuit 1 is used for The AC voltage output by the secondary output of the transformer T1 is converted into a DC voltage through rectification and filtering; the error amplifier circuit 2 is used to sample and amplify the output DC voltage, its input terminal is connected to the output terminal of the output rectification filter circuit 1, and its output terminal is connected to the output terminal of the output rectification filter circuit 1. The input terminals of the reset control circuit 3 are connected; the reset control circuit 3 is used to control th...

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Abstract

The invention relates to a magnetic amplifier based switch power supply self-feedback circuit and a control method therefor. The self-feedback circuit comprises an output rectification filter circuit, an error amplifying circuit, a reset control circuit and the magnetic amplifier; the output rectification filter circuit is used for converting the alternating current voltage from the secondary output of a transformer into direct current voltage through rectifying and filtering; the error amplifying circuit is used for sampling and amplifying the output direct current voltage; the input end of the error amplifying circuit is connected with the output rectification filter circuit while the out end of the error amplifying circuit is connected with the reset control circuit; the reset control circuit is used for controlling the voltage duty ratio on the magnetic amplifier for realizing the automatic regulation of the output voltage; the magnetic amplifier is used for controlling the magnetization state through the reset control circuit; according to the rectangular hysteresis loop characteristic, when the magnetic amplifier is unsaturated, the magnetic amplifier is in a high-resistance state and the circuit is switched off; and when the magnetic amplifier is saturated, the circuit is switched on. The magnetic amplifier based switch power supply self-feedback circuit has the characteristics of low space occupation, simple circuit structure, low dissipation power, high voltage-stabilizing precision and the like.

Description

technical field [0001] The invention relates to the technical field of switching power supply circuits, in particular to a magnetic amplifier-based switching power supply self-feedback circuit and a control method thereof. Background technique [0002] Different electronic systems have different requirements for the combination of output voltages when using multi-output switching power supplies, and there are also strict requirements for the electrical characteristics of the power supply. At present, most of the design schemes of multi-output switching power supply have the following three types. [0003] Option 1, the auxiliary circuit uses a multi-output switching power supply directly output by the secondary winding; Option 2, the auxiliary circuit uses a multi-output switching power supply of a linear voltage regulator; Option 3, a multi-modulator multi-output switching power supply. [0004] Among them, Scheme 1 has a simple structure and is easy to implement, but the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/2176
Inventor 贺啟峰徐成宝杜飞朋
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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