| 摘要 |
A universal zero voltage transition switching cell using a small choke, a pair of switches, and a capacitor is revealed. The application of the universal zero voltage transition switching cell to any of a wide variety of hard switching pulse width modulated power converter topologies yields identical power converters with zero voltage switching properties, without the requirement that the magnetizing current in the main power choke be reversed during each switching cycle. In the subject invention the energy required to drive the critical zero voltage switching transition is provided by the small choke that forms part of the universal zero voltage transition switching cell. The application of the universal zero voltage transition switching cell to buck, boost, buck boost, Cuk, Wittenbreder, flyback, forward, and SEPIC converters is shown. A variation of the universal zero voltage transition switching cell which adds a single diode to clamp ringing associated with the parasitic capacitance of off switches is also revealed.
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