Adjustable resonant apparatus for power converters

摘要

An apparatus comprises a first series resonant inductor coupled to a switching network and a transformer, a first series resonant capacitor coupled to the switching network and the transformer, a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor, a resonant frequency adjusting device coupled to the switching network and the transformer and a switch connected in series with the resonant frequency adjusting device.

主权项

1. An apparatus comprising:
a first series resonant inductor coupled to a switching network and a transformer; a first series resonant capacitor coupled to the switching network and the transformer; a first parallel inductor coupled to the switching network through the first series resonant inductor and the first series resonant capacitor; a resonant frequency adjusting device coupled to the switching network and the transformer; and a switch connected in series with the resonant frequency adjusting device, wherein the switch is formed by two back-to-back connected transistors, and wherein the switch has a first terminal directly connected with the resonant frequency adjusting device and a second terminal directly connected with the switching network, and wherein the switch comprises a first transistor and a second transistor that are turned off when a load of the apparatus is greater than a predetermined threshold and turned on when the load of the apparatus is less than the predetermined threshold.