Patent ID: 8520413

Claim:
A power converter comprising: a first circuit module including a switching element in parallel with a first diode; a second circuit module including a first inductor and the first circuit module, the first inductor being in series with the first circuit module, the second circuit module including a first terminal coupled to a first power terminal; a first capacitor in parallel with the second circuit module, the first capacitor including a first terminal coupled to the first terminal of the second circuit module and a second terminal coupled to a second terminal of the second circuit module, wherein the first capacitor is a variable capacitor, the first inductor is a variable inductor, or both the first capacitor and first inductor are variable; a second diode including a first terminal and a second terminal, the first terminal in series with the second circuit module and the first capacitor, the second terminal coupled to a second power terminal; and a control module for varying one or more of the first capacitor and the first inductor based on at least one of a current of a load circuit or an input voltage, wherein a resonating waveform generated by a resonant circuit of the second circuit is used by the control module to turn off the switching element under zero-current and zero-voltage conditions.