Flyback switching power supply system

Abstract

The invention discloses a flyback switching power supply system, including a VCC24V input power supply for providing DC 24V input power for the system; a 24V-to-15V step-down voltage stabilization unit for reducing 24V power to 15V power, and providing an operating voltage for a main circuit control unit; the main circuit control unit for controlling the operation of a main circuit unit; the maincircuit unit for converting the VCC24V input power; a five-output-power isolation conversion unit for outputting five isolated power outputs in electrical isolation. The system of the present invention is equipped with an interference suppression device, can effectively suppress the transient voltage generated when a main circuit power switching transistor is turned off, reduces the electromagnetic interference of the switching power supply on other units in an industrial control system, and reduces the frequency of industrial control system failures and maintenance. The flyback switching power supply system has a capability of outputting at least more than five isolated power outputs, has a good output expansion capability, and is suitable for applications with multiple power requirements; In addition, the system is simple in overall structure, occupies small area of a printed board, and is suitable for highly integrated board-level applications.

Description

technical field [0001] The invention relates to the field of switch mode power supply (Switch Mode Power Supply, SMPS for short) design field, in particular to a flyback switching power supply system. Background technique [0002] Switch Mode Power Supply (SMPS for short), also known as switching power supply or switching converter, is a high-frequency power conversion device. Its function is to convert a level of voltage into the voltage required by the user through different forms of architecture. [0003] Unlike linear power supplies, most of the power switch tubes used in switching power supplies are switched between fully open mode (saturation region) and fully closed mode (cutoff region). These two modes have the characteristics of low dissipation, and the switching between The conversion has higher dissipation, but for a short time, so it is more energy efficient and produces less waste heat. High conversion efficiency is another advantage of switching power supplie...

AI Technical Summary

Problems solved by technology

Due to the complex internal structure of the switching power supply and the frequent switching of the internal power switch tube, noise and electromagnetic interference may be generated and affect other equipment

In addition, problems such as insufficient output expansion capability and large printed board area also limit the use of switching power supplies in the field of high-integration board-level integration.

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