基于简化统一模型的DC-DC开关变换器数字优化控制策略

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Abstract Operating on big signal condition, the work mode of DC-DC switching converter isn’t only one, so, a novel optimal control strategy based on the simplified unified discrete model is presented, which is easy to be realized adopting digital way for DC-DC converter operating in CCM and DCM. The power-exponent functions in model coefficient matrix are linearized to simplify the unified discrete model based on CCM and DCM. According to the voltage and current characteristics of simplified model, the objective function is designed. Optimal control strategy is deduced by substituting model states into objective function and minimizing the objective function. According to the recursion states and optimal control, the operation mode of simplified model is decided by itself and the output of model provides the optimization output track. For compensating the control error caused by parasitic parameters in actual converter system, the optimal control is modified according to the output error of actual system and model. In this paper, the simplified unified discrete model of Boost converter is founded, optimal control is obtained, and digital PI is adopted to adjust control error. Simulation and experimental results validate that the output voltage of converter can be controlled with fast response and without impulse voltage in starting period, and the output voltage of converter can be controlled accurately and quickly on various work conditions.

Key words： DC-DC switching converter simplified unified discrete model optimal control modified control digital control

Received: 27 July 2010 Published: 20 March 2014

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TM46

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	Liu Qingfeng
	Leng Zhaoxia
	SunJinkun
	Wang Huamin

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Liu Qingfeng,Leng Zhaoxia,SunJinkun等. A Novel Digital Optimal Control for DC-DC Converters Based on Simplified Unified Model[J]. Transactions of China Electrotechnical Society, 2012, 27(6): 118-125.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I6/118

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