have you seen this?
http://www.ee.bgu.ac.il/~pedesign/Graduate_problem_papers/papers2009/ZCS_.pdf
The resonant switching methods look rather complicated to say the least, but are you looking to capture the switching losses? If not have you thought about rolling your own z source inverter? The stress on the h bridge switches is much lower than a current-fed h-bridge and the transformer leakage inductance is no longer critical. Regulation is achieved by simply varying the switch shoot-through or overlap. If you set the turns ratio so that you always must have some shoot through even at 25 volts then the control mechanism becomes that of a simple boost regulator.
http://www.ee.bgu.ac.il/~pedesign/Graduate_problem_papers/papers2009/ZCS_.pdf
The resonant switching methods look rather complicated to say the least, but are you looking to capture the switching losses? If not have you thought about rolling your own z source inverter? The stress on the h bridge switches is much lower than a current-fed h-bridge and the transformer leakage inductance is no longer critical. Regulation is achieved by simply varying the switch shoot-through or overlap. If you set the turns ratio so that you always must have some shoot through even at 25 volts then the control mechanism becomes that of a simple boost regulator.
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