Patent ID: 11955894
Assignee: SILANNA ASIA PTE LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 3:
4. The method of claim 1, wherein:
the flyback converter comprises a quasi-resonant auto-tuning controller and an auxiliary winding; and
the quasi-resonant auto-tuning controller comprises:
a zero-voltage crossing detection circuit; and
a valley tuning finite-state machine having a look-up table; and

the method further comprises:
receiving, by the zero-voltage crossing detection circuit, the auxiliary signal produced by the auxiliary winding and a reference voltage, wherein each oscillation ripple of the plurality of oscillation ripples has a peak point and valley point; and
producing, by the zero-voltage crossing detection circuit, a comparison signal that includes a plurality of pulses when the auxiliary signal is less than the reference voltage, wherein each pulse of the plurality of pulses has a pulse width that corresponds to a half-period of the oscillation ripple of the plurality of oscillation ripples;
determining, by the valley tuning finite-state machine, the pulse width of each pulse of the plurality of pulses of the comparison signal;
producing, by the valley tuning finite-state machine, a divided pulse width from each pulse width, wherein the divided pulse width corresponds to the quarter-period of the oscillation ripple;
storing, by the valley tuning finite-state machine, the divided pulse width of each pulse in the look-up table;
determining, by the valley tuning finite-state machine using the comparison signal, that the auxiliary signal is less than the reference voltage;
waiting, by the valley tuning finite-state machine, the time period, wherein the time period corresponds to the divided pulse width stored in the look-up table if the auxiliary signal is less than the reference voltage.