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This paper focuses on a sample-data model for double edge current programmed mode control (DECPM) and its application to high-frequency and wide-range dc-dc converters. Steady-state conditions and subharmonic oscillation issues for DECPM are addressed. By combining the conventional peak and valley current programmed mode control, a sample-data model for DECPM is proposed. A small signal model for DECPM is developed by deriving the modulation gains (Fm) and the sampling gains (He) for DECPM from the proposed sample-data model. The sampling frequency dependence on the duty ratio and a large current loop gain at high frequency for DECPM are emphasized. The analytical results are verified by the simulation. Finally, DECPM is proposed as a method to control the high-frequency and wide-range dc-dc converters. A 10-MHz four-switch buck boost converter is implemented with DECPM to verify the viability of its application to high-frequency and wide-range converters.
Date of Publication: April 2010