当满足充电条 件的时候，由单片机发出脉宽调制信号（PWM，Pulse Width Modulation），并且初始占空比 为1，也就是让功率元件IGBT 或者VMOS管完全导通，，同时测得此时的太阳电池输...
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脉宽调制信号的频率可以由用户设置电容的大小来调整。
The frequency of PWM wave can also adjusted by engineers through choosing the capacitance.
脉宽调制信号由PWM专用芯片UC3875组成的脉宽调制电路产生。
The signal of PWM is produced by the circuit which is composed of the chips UC3875.
分析了脉宽调制信号动态调节LED亮度的原理，设计了单片机控制电路；
The principle of PWM signals adjusting LED bright was analyzed, and the controlling circuit of MCU was designed.
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