The theory of PWM is used in the system, and single of PWM is offered by controller UC3825.The feedback voltage and current achieved from output is used to control the change of the output.

• 系统主电路逆变部分采用了脉宽调制技术(PWM)，PWM信号由集成控制器UC3825产生，从输出端实时采样电压、电流反馈信号，以控制输出电压和电流的变化。