Zero-voltage-zero-current switching in high-output-voltage full bridge PWM converters using the interwinding capacitance

TitleZero-voltage-zero-current switching in high-output-voltage full bridge PWM converters using the interwinding capacitance
Publication TypeConference Paper
Year of Publication1998
AuthorsGarabandic, D., W. G. Dunford, and M. Edmunds
Conference NamePower Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE
Pagination955 -960 vol.2
Date Publishedmay.
Keywords1.2 kW, 600 V, 62.5 kHz, active-to-passive leg transistors, bridge circuits, capacitance, DC/DC converter, full bridge PWM converters, high-output-voltage, high-output-voltage applications, IGBT switches, insulated gate bipolar transistors, interwinding capacitance, MCT switches, parasitic interwinding capacitance, passive-to-active leg transistors, power semiconductor switches, primary side inductor, PWM power convertors, rated output voltage, rectifiers, reverse recovery, ringing, switching circuits, transformer windings, zero-current switching, zero-current turn off, zero-current turn on, zero-voltage switching, zero-voltage turn off, zero-voltage turn on

A novel zero-voltage and zero-current switching (ZVZCS) full-bridge (FB) pulse width modulated (PWM) converter is proposed. The new converter uses the interwinding capacitance and a small primary side inductor to achieve a zero-current-zero-voltage turn off and a zero-current turn on of the passive-to-active leg transistors. The turn off of the active-to-passive leg transistors is with zero-voltage and the turn on is with zero-voltage-zero-current across them. The ringing caused by the parasitic interwinding capacitance and by the reverse recovery of the rectifiers is reduced. The new converter is attractive for high-output-voltage applications (600 V-1000 V) where the interwinding capacitance is sufficiently dominant. In addition to that, switches such as IGBTs and MCTs can be used at higher frequencies which is particularly desirable for high-power application (above 2 kW). The experimental results obtained from an IGBT-based 62.5 kHz DC/DC converter with a rated output voltage of 600 V and a nominal power of 1.2 kW are presented


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