Digital Average Voltage/Digital Average Current Predictive Control for Switching DC-DC Converters

作者：Zhou, Guohua; Mao, Guihua^*; Zhao, Hongbo; Zhang, Wei; Xu, Shungang

来源：IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018, 6(4): 1819-1830.

DOI：10.1109/JESTPE.2018.2868974

• DC-DC converter
• digital control
• load transient response
• predictive control
• sampled-data modeling
• stability analysis
• z-domain transfer function

In this paper, the digital average voltage/digital average current (DAV/DAC) predictive control for switching dc-dc converter is proposed. The advantages of the proposed predictive control technique include no subharmonic oscillation in the full range of duty cycle, wide stability range, fast load transient response, and realization of overcurrent protection. Taking buck converter in continuous conduction mode as an example, the algorithm of DAV/DAC predictive control is analyzed in detail. The sampled-data modeling is performed to explore the stability of DAV/DAC predictive control, by which the stability boundary is obtained. The z-domain small-signal model of DAV/DAC predictive control is also derived to analyze the load transient performance. The analysis results prove that DAV/DAC predictive control is the combined control of the existed DAV predictive control and DAC predictive control in the previous publications. The stability boundary and transient performances of DAV/DAC controlled buck converter are influenced by the weighted factors of inductor current and output voltage, and a simple design oriented reference about the weighted factors is given in this paper. Finally, the theoretical analysis is verified by simulations and experiments.

• 出版日期2018-12
• 单位西南交通大学