Single chip microcomputer-controlled switching power supply and control method thereof

Abstract

The invention provides a single chip microcomputer-controlled switching power supply and a control method thereof. The switching power supply comprises a power grid input end, wherein the first output of the power grid input end is connected with the first input of a high-frequency transformer through a first rectifier filter; the output of the high-frequency transformer is connected with a direct-current output end through a second rectifier filter; the second output of the second rectifier filter is connected with the first input of a single chip microcomputer through an AD sampling part; the first output of the single chip microcomputer is connected with the input of a switching tube; the output of the switching tube is connected with the second input of the high-frequency transformer; the second output of the power grid input end is connected with the input of a small-power transformer; the output of the small-power transformer is connected with the input of a rectifying voltage-stabilization filter; the output of the rectifying voltage-stabilization filter is connected with the second input of the single chip microcomputer; the second output of the single chip microcomputer is connected with a liquid crystal display and an alarm part; the output of a keyboard is connected with the third input of the single chip microcomputer; the switching power supply is controlled through the single chip microcomputer, the program-controlled adjustment is realized, the efficiency is high, and the output voltage and current are stable.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a switching power supply controlled by a single-chip microcomputer and a control method thereof. Background technique [0002] Switching power supply can provide DC power for various loads, and its application is very extensive. Power supplies with multiple output voltages, such as personal computers, home appliances, and communication equipment, are required to meet the power supply requirements of various forms of external equipment. However, in some special occasions, program-controlled power supply regulation, high efficiency, and high reliability are required, and the existing technology often cannot meet the requirements. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a single-chip microcomputer-controlled switching power supply and its control method, pro...

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