一种基于温度反馈并采用PWM方式控制功放散热风机转速的电路设计

A Circuit Design to Control the Cooling Fan Speed of the Power Amplifier with PWM Method Based on Temperature Feedback

本文首先介绍了一种基于器件LM35DH的温度采样电路，在此基础上，详细阐述了一种利用实际采样温度大小，温度变化快慢作为反馈参数，并采用脉冲宽度调制方式控制功率放大器散热风机转速的电路设计。

This paper first introduces a temperature sampling circuit based on LM35DH, and de- scribes detailed a circuit design to control the cooling fan speed of the power amplifier with PWM method by using the actual sampling temperature and the temperature variation as feedback parameters.