Wide input voltage rectifying and voltage stabilizing circuit

Abstract

The invention discloses a wide input voltage rectifying and voltage stabilizing circuit. An AC/DC bridge rectifier circuit is adopted to convert the input AC voltage into pulsating DC voltage, and a rectifying and voltage stabilizing value sampling driving circuit controls the switching on and off of an MOS (Metal Oxide Semiconductor) transistor voltage stabilizing driving circuit, thereby ensuring that when the input AC voltage is too high, the output voltage VDC2 is constant. For example, when the input AC voltage is greater than the voltage stabilizing set value, the rectifying and voltagestabilizing value sampling driving circuit switches off the MOS transistor voltage stabilizing driving circuit to stop charging a filter voltage stabilizing circuit; and when the input AC voltage is less than the voltage stabilizing set value, the rectifying and voltage stabilizing value sampling driving circuit controls the MOS transistor voltage stabilizing driving circuit to be switched on to charge the filter voltage stabilizing circuit, thereby keeping the adjusted voltage at the set constant value and meeting occasions with a wider input voltage range. The circuit disclosed by the invention has the advantages of simple circuit connection, high anti-interference capability, wide voltage input range, good sampling circuit stability, adjustable voltage output range and the like.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a wide input voltage rectifying and stabilizing circuit. Background technique [0002] At present, commonly used low-power switching power supplies mostly use isolated flyback (FLYBACK) circuits, and their full voltage input range is 85-264VAC. Exceeding the input voltage range will cause permanent damage to the switching power supply. Especially in the power industry, three-phase power is mostly used, and its line voltage power supply is 380VAC. The fluctuation of the power grid and voltage harmonic interference may cause its voltage to reach about 460VAC. It can ensure that the rectification and voltage stabilization circuit of the system will not be damaged when the external power supply fluctuates greatly. Contents of the invention [0003] In order to solve the above technical problems, the present invention proposes a wide input voltage rectification and stabilization ci...

AI Technical Summary

Problems solved by technology

[0002] At present, the commonly used low-power switching power supply mostly adopts the isolated flyback (FLYBACK) circuit, and its full voltage input range is 85-264VAC. Exceeding the input voltage range will cause permanent damage to the switching power supply.

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