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Small-signal analysis and control design of asymmetrical half-bridge DC-DC converters

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4 Author(s)
Choi, B. ; Sch. of Electr. Eng. & Comput. Sci., Kyungpook Nat. Univ., Taegu, South Korea ; Lim, W. ; Sanghyun Bang ; Seungwon Choi

This paper presents the small-signal modeling, dynamic analysis, and control design of the asymmetrical half-bridge dc-dc converter that employs a clamp capacitor and a magnetizing inductor to accommodate pulsewidth-modulated operation with asymmetrical duty ratios. The circuit averaging technique is applied to extract the small-signal dynamics of the power stage, and a graphical loop-gain method is used to design the feedback compensation and analyze the closed-loop performance of the converter. The distinctive power-stage dynamics of the converter are addressed and design guidelines for voltage feedback compensation are established. The results of the control design and closed-loop analysis are substantiated by experiments using an experimental converter.

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Industrial Electronics, IEEE Transactions on  (Volume:53 ,  Issue: 2 )