基于ARM的数字峰值电流控制BUCK变换器研究

Study of Digital Peak Current Control BUCK Converter Based on ARM

针对为克服模拟控制开关变换器设计不灵活的缺陷而提出的新型数字峰值电流控制BUCK变化器,采用前缘调制DPC控制算法进行控制。介绍了该变换器的结构及工作原理,阐述了具体的算法,并通过仿真对其控制效果进行了验证。结果表明:该BUCK变换器具有优异的负载瞬态特性,前缘调制DPC算法从原理上消除了次谐波振荡,采用ARM控制器只需通过软件编程就可以修改控制规律,还可以及时通过仿真验证,使得对设计工作变得相当灵活,从而极大地缩短了设计周期,具有一定的应用价值。

Aimed at the new digital peak current control BUCK converter which was proposed to solve the puzzle of analog control switch convener with low flexibility, a leading-edge modulation DPC control strategy was proposed. The structure and the basic principle of the converter were introduced. Then the specific strategy was clarified. The validity of this control strategy was tested by simulation. The results show that the DPC control BUCK converter based on ARM has outstanding load transient characteristic, the control strategy avoid sub-harmonic oscillation, this convert can change control function by software program＇s modifica- tion, and the simulation is very easy, which make the design very flexible and shorten the design＇s time. It is of certain practical importance.