Buck变换器设计

Design of Buck converter

在电力电子应用领域,直流斩波电路应用广泛,在电机调速里面起到至关重要的作用。设计的buck变换器包括三部分组成,分别是PWM控制电路、主回路和反馈回路。其中PWM控制电路的功能主要是靠SG3525芯片完成的,而在反馈回路中则加入了超前-滞后校正器,从而使变换器拥有更好的动态性能。在设计中对补偿电路进行频域法分析,根据波特图设计出了较为理想的补偿器。

DC chopper circuit is widely used in the field of power electronics applications,playing a crucial role in the inside of the motor speed.The design of the buck converter consists of three parts, namely the PWM control circuit,main circuit and feedback loop.PWM control circuit functions rely on SG3525 chip.Ahead-lag correction is added to the feedback loop in order that the converter has a better dynamic performance.