Non-linear properties and efficiency improvements of a bi-directional isolated DC-AC converter with soft commutation

Author

Zimmermann, Claudio ; Rufer, Alfred ; Chabert, Christophe

Author_Institution

Lab. d´´Electronique Industrielle, Ecole Polytech. Fed. de Lausanne, Switzerland

Volume

3

fYear

2005

fDate

2-6 Oct. 2005

Firstpage

1985

Abstract

This paper presents the operation principle and the properties of a single-phase DC-AC converter with medium frequency transformer and soft commutation. The influence of the non-dissipative snubber capacitor and the transformer parasitic components for ZVS and ZCS are explained in relation with their influence of the output characteristic. Additionally the effect of the semiconductor voltage drop is considered to get a precise circuit model for steady-state continuous operation. Finally efficiency improvements of this phase-shift PWM DC-AC converter are achieved by actively short-circuiting the circulating current at the AC-side during full load operation.

Keywords

DC-AC power convertors; PWM power convertors; commutation; power capacitors; power transformers; snubbers; switching convertors; zero current switching; zero voltage switching; ZCS; ZVS; bidirectional isolated DC-AC converter; medium frequency transformer; non-dissipative snubber capacitor; phase-shift PWM DC-AC converter; semiconductor voltage drop; soft commutation; transformer parasitic components; Bidirectional control; Capacitors; Circuits; Frequency conversion; Pulse width modulation; Pulse width modulation converters; Snubbers; Steady-state; Zero current switching; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005

ISSN

0197-2618

Print_ISBN

0-7803-9208-6

Type

conf

DOI

10.1109/IAS.2005.1518720

Filename

1518720