Title :
Implementation of the Soft Switching DC/DC Converter
Author :
Lin, Bor-Ren ; Chiang, Huann-Keng ; Chen, Chien-Chih ; Huang, Chien-Lan
Author_Institution :
Nat. Yunlin Univ. of Sci. & Technol., Yunlin
Abstract :
A new soft switching dc/dc converter is presented to achieve zero voltage switching (ZVS) of all switching devices. In the proposed converter, an auxiliary switch and clamp capacitor is used to recycle the energy stored in the leakage inductor, limit the voltage stress of switches and achieve resonance between the transition interval between the main and auxiliary switches. During the transition interval, the resonance based on the junction capacitance of switches and transformer leakage inductance can achieve ZVS operation of power switches. The pulse-width modulation (PWM) waveforms of two switches are generated in a complementary way with a time delay. Two modules of the series-connected transformers with center-tapped rectifier are used in the proposed converter to share the load current. Since these two modules are connected in series in the primary side and parallel-connected in the secondary side. The load current can be equally shared by these two center-tapped rectifiers. Based on the operation behavior, each transformer in the proposed converter can be operated as an inductor or a transformer. No output filter inductor is needed in the proposed converter. The circuit analysis, principle of operation, steady state analysis and design considerations of the proposed converter are provided in detail. Finally, experimental results for a 220 W prototype converter at a constant switching frequency of 150 kHz are obtained to show the performance of the proposed converter.
Keywords :
DC-DC power convertors; power capacitors; power inductors; pulse width modulation; switching convertors; zero voltage switching; PWM waveforms; ZVS operation; auxiliary switch; center-tapped rectifier; circuit analysis; clamp capacitor; frequency 150 kHz; junction capacitance; leakage inductor; operation principle; power 220 W; power switches; pulse-width modulation waveforms; series-connected transformers; soft switching dc/dc converter; steady state analysis; transformer leakage inductance; voltage stress; zero voltage switching; Capacitors; Clamps; DC-DC power converters; Inductors; Pulse width modulation; Rectifiers; Resonance; Switches; Switching converters; Zero voltage switching;
Conference_Titel :
Industrial Electronics and Applications, 2007. ICIEA 2007. 2nd IEEE Conference on
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-0737-8
Electronic_ISBN :
978-1-4244-0737-8
DOI :
10.1109/ICIEA.2007.4318423