Abstract

This paper presents considerations on the switching frequency and duty cycle and operating equations of soft-switching buck chopper. These considerations are discussed and applied to selected soft-switching families such as ZVS-QRC, ZCS-QRC, ZVS-QSW-CV ZCS-QSW-CC, ZVT-PWM and ZCT-PWM (J.Abu. Qahouq and I. Batarseh, IEEE Trans. Power Electron., vol. 9, no. 5. pp. 684-691, 2002). The limitations on switching frequency and duty cycle are derived in terms of: chopper input voltage (V/sub g/), chopper output current (I/sub F/), resonant elements values including (C/sub n/ L/sub r/), voltage and current of filter capacitor and reactor or initial values of capacitor and reactor (V/sub i/, I/sub t/).

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