A DC switching power supply with shock resistance

Abstract

The invention discloses a DC switching power supply with impact resistance, comprising: a rectification module, a buffer module, a primary side control module, a high frequency transformer, a secondary side rectification and filtering module, an overvoltage detection module, a controller, and a voltage and current detection module The rectifier module is connected to the buffer module, and is used to convert alternating current into direct current and output to the buffer module; the buffer module is respectively connected to the primary side control module and the high-frequency transformer, and is used to buffer voltage impact, and rely on the auxiliary coil of the high-frequency transformer to control the output to the primary side control module; the primary side control module is connected to the high-frequency transformer for controlling the operation of the high-frequency transformer; The method for cutting off the operation of a high-frequency transformer when detecting a voltage shock is provided to solve the problem in the prior art that the secondary side of the transformer is easily damaged when a DC switching power supply encounters a voltage shock.

Description

technical field [0001] The invention relates to a DC switching power supply, in particular to a DC switching power supply with shock resistance. Background technique [0002] DC switching power supply is widely used in almost all electronic equipment in industrial sites, household equipment, etc. [0003] Based on different applications of the switching power supply, a protection circuit is required to ensure the reliability of the switching power supply. For a switching power supply whose input voltage source is an external AC power supply, a large surge voltage will be generated due to the instability of the external AC power supply, or the influence of the environment and weather, such as lightning strikes. The traditional switching power supply is based on analog circuits. Although it can achieve shock resistance before the transformer, the protection of the voltage resistance of the secondary side of the transformer is lacking. [0004] The invention designs a switchi...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a DC switching power supply with shock resistance, which adopts the method of cutting off the high-frequency transformer when detecting a voltage shock, so as to solve the problem that the secondary side of the transformer is easily damaged when the DC switching power supply encounters a voltage shock in the prior art. damage problem

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