A passive lossless snubber cell for nonisolated PWM DC/DCconverters
Ching-Jung Tseng; Chern-Lin Chen
Industrial Electronics, IEEE Transactions on
Volume 45, Issue 4, Aug 1998 Page(s):593 - 601
Digital Object Identifier 10.1109/41.704887
Summary:A passive lossless snubber cell is proposed to improve the turn-on
and turnoff transients of the MOSFETs in nonisolated pulsewidth
modulated (PWM) DC/DC converters. Switching losses and EMI noise are
reduced by restricting di/dt of the reverse-recovery current and dv/dt
of the drain-source voltage. The MOSFET operates at
zero-voltage-switching (ZVS) turnoff and near zero-current-switching
(ZCS) turn-on. The freewheeling diode is also commutated under ZVS. As
an example, operation principles, theoretical analysis, relevant
equations, and experimental results of a boost converter equipped with
the proposed snubber cell are presented in detail. Efficiency of 96% has
also been measured in the experimental results reported for a 1 kW 100
kHz prototype in the laboratory, Six basic nonisolated PWM DC/DC
converters (buck, boost, buck-boost, Cuk, Sepic, and Zeta) equipped with
the proposed general snubber cells are also shown in this paper
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