Title :
A quasi-resonant zero-current-switching buck PWM converter using a nonlinear resonant inductor
Author :
De Paiva, E.P. ; de Freitas, Luiz C. ; Farias, Valdeir Jose ; Coelho, Ernane Antonio Alves ; Vieira, J.B.
Author_Institution :
Departamento de Engenharia Eletrica, Universidade Federal de Uberlandia
Abstract :
This paper shows a lossless commutation cell that uses a nonlinear resonant inductor. The principle of the nonlinear resonant inductor is applied to a QRC-ZCS-PWM buck converter with the objective of reducing the peak current in the main switch, maintaining the ZCS characteristics of the QRC-ZCS-PWM buck converter. This is achieved by unsaturating the core of the nonlinear resonant inductor limiting its peak value. The proposed converter has the following advantages: lower current stress in the main switch; the current peak value stays almost fixed with the load increase; it operates with fixed frequency; and it has lossless commutation
Keywords :
DC-DC power convertors; PWM power convertors; commutation; inductors; resonant power convertors; switching circuits; QRC-ZCS-PWM buck converter; core unsaturation; fixed frequency operation; lossless commutation cell; lower current stress; main switch; nonlinear resonant inductor; peak current reduction; quasi-resonant zero-current-switching buck PWM converter; Buck converters; Equations; IEEE members; Inductance; Inductors; Permeability; Pulse width modulation converters; Resonance; Switches; Zero current switching;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1996. APEC '96. Conference Proceedings 1996., Eleventh Annual
Conference_Location :
San Jose, CA
Print_ISBN :
0-7803-3044-7
DOI :
10.1109/APEC.1996.500461
