在数字控制高频开关电源中,数字补偿控制器及高分辨率数字脉宽调制( DPWM)是系统实现的关键.这里以Boost变换器为例,基于电路平均法建立了变换器的数学模型,采用单变量系统极点配置法设计了数字补偿控制器.为了在不提高系统时钟频率的情况下提高系统精度,提出一种数字时钟管理器与数字抖动相结合的新型混合DPWM方法,提高了系统的分辨率.仿真和实验结果验证了设计的正确性.%Digital compensator and high resolution digital pulse width modulation (DPWM) are the keys of the for digital controll high frequency switching mode power supply.Taking Boost converter as an example,a circuit average model is derived and a digital compensative controller is designed with single input single output poles placement method.In order to improve the system resolution without requirements of increasing of system clock frequency,a hybrid DPWM strategy based on the combination of digital clock management(DCM) and digital dithering is proposed. The simulation and experimental results validate the correctnes of the design.
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