Abstract :
An improved zero current switching pulse width modulation (ZCS-PWM) commutation cell is proposed, which is suitable for high power applications using IGBTs as the power switches. It provides ZCS operation for active switches with low current stress, without overvoltage and PWM operating at constant frequency. The main advantage of this cell is a substantial reduction of the resonant current peak through the main switch during the commutation process. Therefore, the RMS current through it is very close to that observed in hard-switching PWM power converters. Also, small ratings auxiliary components can be used. To demonstrate the feasibility of the proposed ZCS-PWM commutation cell, it was applied to a boost power converter. Operating principles, theoretical analysis, design guidelines and a design example are described and verified by experimental results obtained from a prototype operating at 40 kHz, with an input voltage rated at 155 V and 1 kW output power. The measured efficiency at full load was 97.5%
Keywords :
DC-DC power convertors; PWM power convertors; bipolar transistor switches; commutation; insulated gate bipolar transistors; power bipolar transistors; power semiconductor switches; switching circuits; 1 kW; 155 V; 40 kHz; 97.5 percent; IGBT power switches; PWM power converters; ZCS; auxiliary components; boost power converter; commutation cell; design guidelines; operating principles; ratings; resonant current peak; theoretical analysis; Frequency; Insulated gate bipolar transistors; Pulse width modulation; Pulse width modulation converters; Resonance; Space vector pulse width modulation; Stress; Switches; Voltage control; Zero current switching;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1997. APEC '97 Conference Proceedings 1997., Twelfth Annual
