A power supply system includes a flyback power converter and a control circuit coupled to the flyback power converter. The power converter includes an input, an output, a transformer having a plurality of windings coupled between the input and the output, a first power switch coupled to the transformer and a clamping circuit having a capacitor, a diode, and a second power switch coupled to one of the plurality of windings. The capacitor and the diode are coupled in parallel between the winding and the second power switch. The control circuit is configured to operate the power converter in a discontinuous conduction mode and control the first power switch and the second power switch at a fixed frequency to achieve substantially zero voltage switching during turn on of the first power switch. Various other example power supply systems, power converters, and methods for controlling a power converter are also disclosed.
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