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Small-signal modeling for design of robust variable-frequency flyback battery chargers for portable device applications

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2 Author(s)
Lempinen, J. ; Electron. Lab., Oulu Univ., Finland ; Suntio, T.

A novel methodology to derive small-signal models for a peak-current controlled variable-frequency flyback converter operating in boundary mode is presented. The loop gain of a universal input 5-W battery charger for mobile phones is analyzed and compared to the predictions. The results obtained show a good correlation between predictions and measurements validating the modeling. The implications (i.e. RHP and ESR zeros as well as opto-coupler in the feedback loop) for controller design is discussed

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Applied Power Electronics Conference and Exposition, 2001. APEC 2001. Sixteenth Annual IEEE  (Volume:1 )

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