Microcontroller-Based Peak Current Mode Control Using Digital Slope Compensation

作者：Hallworth Michael^*; Shirsavar Seyed Ali

来源：IEEE Transactions on Power Electronics, 2012, 27(7): 3340-3351.

DOI：10.1109/TPEL.2011.2182210

• DC-DC switch mode power supplies (SMPS)
• digital peak current mode control
• digital slope compensation
• discrete controller

Microcontroller-based peak current mode control of a buck converter is investigated. The new solution uses a discrete time controller with digital slope compensation. This is implemented using only a single-chip microcontroller to achieve desirable cycle-by-cycle peak current limiting. The digital controller is implemented as a two-pole, two-zero linear difference equation designed using a continuous time model of the buck converter and a discrete time transform. Subharmonic oscillations are removed with digital slope compensation using a discrete staircase ramp. A 16 W hardware implementation directly compares analog and digital control. Frequency response measurements are taken and it is shown that the crossover frequency and expected phase margin of the digital control system match that of its analog counterpart.

• 出版日期2012-7