Title :
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
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;
Conference_Titel :
Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005
Print_ISBN :
0-7803-9208-6
DOI :
10.1109/IAS.2005.1518720
