A Wide Input Voltage Flyback Switching Power Supply Suitable for Driving DC Motors

Abstract

The invention relates to a wide input voltage flyback switching power supply suitable for driving a DC motor, comprising: a sequentially connected power starting circuit, a clamping circuit, a switching transformer, a constant power circuit and a constant voltage control circuit, a power starting circuit and a switch Transformer, constant voltage control circuit connection. The invention can realize ultra-wide input voltage at a lower cost and can be used as a drive power source for a medium-power DC motor. The power source efficiency is as high as 85%, the input voltage range is wide, and the maximum output power can reach 240W.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a wide input voltage flyback switching power supply circuit suitable for driving a DC motor. Background technique [0002] The AC mains voltage in the world is generally 100-120V or 220-240V. In some areas with backward power, the voltage fluctuation range is very large, and the largest fluctuation can be from 80 to 300V. Now the widely used switching power supply, the general flyback switching power supply The input voltage range of the converter can only satisfy the relationship of 1:3, that is, 90-270VAC, and the input voltage range of the forward converter is small, only 90-130VAC or 180-264VAC; while using the boost mode (AFC ) converter input voltage range is only 90-270VAC (and the cost is high), if the input voltage of the product changes greatly under the existing technical conditions, the switching power supply used in the product must be redesigned, which will make product d...

AI Technical Summary

Problems solved by technology

[0002] The AC mains voltage in the world is generally 100-120V or 220-240V. In some areas with backward power, the voltage fluctuation range is very large, and the largest fluctuation can be from 80 to 300V. Now the widely used switching power supply, the general flyback switching power supply The input voltage range of the converter can only satisfy the relationship of 1:3, that is, 90-270VAC, and the input voltage range of the forward converter is small, only 90-130VAC or 180-264VAC; while using the boost mode (AFC ) converter input voltage range is only 90-270VAC (and the cost is high), if the input voltage of the product changes greatly under the existing technical conditions, the switching power supply used in the product must be redesigned, which will make product design and management Increased costs

The input voltage range of the converter using the boost mode (AFC) is 90-270VAC, which can indeed meet the voltage requirements of most regions, but the power supply is large in size and high in cost, and cannot meet the requirements of some special regions.

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