应用于计算机的低噪声开关电源电路设计

Low Noise Switch Power Circuit Design for Computer Application

设计了一种应用于计算机的低噪声开关电源电路,通过调节PWM占空比来达到系统稳定输出的目的,同时通过内部保护电路来监控和保护3.3V/±5V/±12V输出电压。根据计算机电源系统对该电路以及内部模块电路进行了介绍和分析。仿真和测试结果表明,采用该开关电源控制电路组成的系统在提高电路性能的同时,可以有效提高系统的稳定性和抗噪性,具有输出电压精度高、输出纹波小、低噪声、安全可靠等特点。

A low noise switch power circuit for computer power supply was designed. It can provide the output voltage by regnlating ripple of PWM signals to drive a transformer, and a built-in protection circuit was used to supervise and protect the 3.3 V/± 5 V/±12 V outputs. The switch power circuit and the internal module circuit were introduced and analyzed based on the computer power supply system. The simulation and experimental results show that this PWM control circuit can effectively improve the system stability and antinoise. This system has the characteristics of high output precision, little output ripple, low noise, safety etc.