数控DC-DC变换器电流采样控制策略

Current sampling control strategy of digital control DC-DC converter

基于F2407A DSP控制系统,提出了一种在电流断续时采用开环控制的策略,并针对数字系统离散采样的特点,根据每个开关周期的占空比来调整相应的电流采样点,以保证电流采样精度。实验结果表明,该控制策略可以很好地实现电路的恒流控制。

Limited by the sampling frequency, the average current strategy for digital control DC-DC converter would be out of control when the current is discontinuous, An opening loop control scheme based on F2407A DSP was proposed. Considering the discrete sampling character of the digital system, the current sampling point was regulated according to the duty ration for each switching period in order to make better sampling precision. The experimental result proved that, the scheme could realize nice constant current control.