A passive lossless snubber cell for nonisolated PWM DC/DC converters

Author

Tseng, Ching-Jung ; Chen, Chern-Lin

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

45

Issue

4

fYear

1998

fDate

8/1/1998 12:00:00 AM

Firstpage

593

Lastpage

601

Abstract

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

Keywords

DC-DC power convertors; MOSFET; PWM power convertors; commutation; electromagnetic interference; losses; semiconductor diodes; snubbers; switching circuits; 1 kW; 100 kHz; 96 percent; Cuk converter; EMI noise; MOSFET; Sepic converter; ZVS turnoff; Zeta converter; boost converter; buck converter; buck-boost converter; drain-source voltage; freewheeling diode commutation; near ZCS turn-on; near zero-current-switching; nonisolated PWM DC/DC converters; passive lossless snubber cell; reverse-recovery current; snubber cell; switching losses; turn-on transients; turnoff transients; zero-voltage-switching; DC-DC power converters; Electromagnetic interference; MOSFETs; Noise reduction; Pulse width modulation; Pulse width modulation converters; Snubbers; Switching loss; Zero current switching; Zero voltage switching;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/41.704887

Filename

704887