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

Claim 12:
13. The flyback converter of claim 10, wherein 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;
wherein the zero-voltage crossing detection circuit is configured to:
receive the auxiliary signal produced by an auxiliary winding of the flyback converter and a reference voltage, wherein each oscillation ripple of the plurality of oscillation ripples has a peak point and valley point; and
produce 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; and
wherein the valley tuning finite-state machine is configured to:
determine the pulse width of each pulse of the plurality of pulses of the comparison signal;
produce a divided pulse width from each pulse width, wherein the divided pulse width corresponds to the quarter-period of the oscillation ripple;
store the divided pulse width of each pulse in the look-up table;
determine, using the comparison signal, that the auxiliary signal is less than the reference voltage;
wait 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.