| 摘要 |
<p>A new principle for high efficiency power conversion at high frequencies is described. The principle provides zero voltage switching by using the magnetising current of a transformer or parallel inductance to charge the switch adjunct capacitance and other capacitance during the dead time. The transformer is prevented from being loaded during the dead time. An embodiment of the invention is described where loading of the transformer during the dead time is prevented by directing the output inertial current to a capacitor instead of through the rectifiers to the secondary of the transformer. This can also be achieved by using synchronised rectification that provides pulse width modulated regulation on the output and ensures that the transformer secondary is separated from the inertial current of the output during the dead time. Voltage and current stresses on the switching devices and rectifiers are minimised. The principle may be applied to inverters where the load is resistive.</p> |
