脉宽调制(PWM)是利用微处理器的数字输出来对模拟电路进行控制的一种非常有效的技术，广泛应用在从测量、通信到功率控制与变换的许多领域中。-Pulse width modulation (PWM) is the use of the microprocessor to the digital output of analog circuits to control a very effective technique, widely used in measurement, communicati