Switch power supply circuit

一种开关电源电路

Abstract

The utility model relates to the field of a switch power supply circuit. The technical problem to be solved is to overcome the defects in the prior art and provide a switch power supply circuit whichcan reduce a withstanding voltage range of a PWM controller and has simple structure and low cost. The structure of the utility model is that: the switch power supply circuit comprises a rectificationcircuit, a transformer, a load, the PWM controller and a power supply circuit of the PWM controller; after being rectified by the rectification circuit, an alternating current is controlled by the PWM controller, and then is outputted to the load by a main winding of the transformer; the power supply circuit is an improved voltage drift circuit; and a power is connected to the PWM controller through the power supply circuit by an auxiliary winding of the transformer. The improved voltage drift circuit adopted as the power supply circuit of the PWM controller can shorten a variation range of the power supply circuit of the PWM controller and play a role in protecting the PWM controller.
本实用新型涉及开关电源电路领域,所要解决的技术问题是克服现有技术中的不足,提供一种能够缩小PWM控制器的承受电压范围,结构简单,成本低的开关电源电路。结构包括整流电路、变压器、负载、PWM控制器及其供电电路,交流电通过整流电路进行整流后,经过PWM控制器的控制,再通过变压器的主绕组输出到负载,所述供电电路为一个改善电压漂移电路,电源由变压器的辅助绕组经过供电电路连接到PWM控制器。采用改善电压漂移电路作为PWM控制器的供电电路,能够缩小PWM控制器的供电电压的变化范围,起到保护PWM控制器的作用。

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