| CPC H02M 3/33571 (2021.05) [H02M 3/01 (2021.05)] | 20 Claims |
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1. An isolated power converter, comprising:
a transformer comprising a primary winding, a first auxiliary winding, and a second auxiliary winding each on a primary side of the transformer;
a converter stage configured to convert a DC input for driving the primary winding of the transformer, the converter stage comprising a resonant capacitor electrically connected to the primary winding;
a controller configured to control switching of the converter stage; and
a voltage supply circuit configured to select a first voltage as a supply voltage for the controller if a voltage proportional to a secondary side voltage of the transformer is at a first level or select a second voltage as the supply voltage if the voltage proportional to the secondary side voltage is at a second level greater than the first level,
wherein the first voltage corresponds to a summation of a voltage across the first auxiliary winding and a voltage across the resonant capacitor,
wherein the second voltage corresponds to a voltage across the second auxiliary winding.
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