Five-path output microcomputer monitoring switching power supply

Abstract

The invention provides a five-path output microcomputer monitoring switching power supply, and solves the problems that the existing power supply is high in power consumption and high in temperature increment and does not have a corresponding failure protective circuit. A power supply control circuit adopts a flyback topological structure and realizes PWM pulse width adjustment through output sampling and a negative feedback loop, so that output stability is achieved. The five paths of output control circuit parts are independent mutually and are not influenced mutually, and the power supply is additionally provided with a PFC power factor correcting circuit and an RCD absorbing circuit, so input overvoltage protection, input undervoltage protection, output overvoltage protection, output shortcircuit protection and output overload protection functions are realized simultaneously, and the usability and the reliability of the power supply are considered fully from heat design, electromagnetic shielding design and safety standard design.

Description

technical field [0001] The invention is mainly applied to the power supply of the railway signal microcomputer monitoring system, and the product design is carried out according to the individual requirements of the product. Background technique [0002] At present, the railway signal microcomputer monitoring system has been applied and most of the power supplies are linear power supplies. From the field application and user feedback, the problems are summarized as follows: the power supply output has no short-circuit protection function, and the power supply will burn out when the output is short-circuited; the power supply output has no overvoltage The protection function may damage the external equipment; the input has no overvoltage and undervoltage protection circuit, and the power supply may be burned out when the input is abnormal; the internal material of the power supply is not low-smoke and halogen-free, and when the power supply burns out, certain smoke will be gen...

AI Technical Summary

Problems solved by technology

[0002] At present, the railway signal microcomputer monitoring system has been applied and most of the power supplies are linear power supplies. From the field application and user feedback, the problems are summarized as follows: the power supply output has no short-circuit protection function, and the power supply will burn out when the output is short-circuited; the power supply output has no overvoltage The protection function may damage the external equipment; the input has no overvoltage and undervoltage protection circuit, and the power supply may be burned out when the input is abnormal; the internal material of the power supply is not low-smoke and halogen-free, and when the power supply burns out, certain smoke will be generated, endangering personal safety ;The power supply shell is a non-closed shell, and the electromagnetic shielding effect is not good; the power supply generates a lot of heat and low efficiency

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