Patent ID: 11876436
Assignee: HALO MICROELECTRONICS INTERNATIONAL
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 11:
12. The controller of claim 11, further comprising:
a first transistor, wherein the first transistor and the first diode-connected transistor form a first current mirror;
a first current source configured to generate a first predetermined current level for determining whether the inductor current reduces to zero, and whether the drain voltage of the power switch enters the valley of the resonant ringing, wherein the first current source is connected in series with the first transistor;
a second transistor, wherein the second transistor and the second diode-connected transistor form a second current mirror;
a second current source configured to generate a second predetermined current level for determining whether the drain voltage of the power switch exits the valley of the resonant ringing, wherein the second current source is connected in series with the second transistor;
a first flip-flop circuit having a clock input coupled to a common node of the first current source and the first transistor, a data input coupled to a bias voltage source, a clear input configured to receive a turn-on signal of the power switch through a first inverter, and an output configured to generate a first signal indicative of when the inductor current reduces to zero; and
a second flip-flop circuit having a clock input coupled to the common node of the first current source and the first transistor, a data input coupled to the bias voltage source, a clear input coupled to a common node of the second current source and the second transistor, and an output configured to generate a second signal indicative of when the drain voltage of the power switch enters the valley of the resonant ringing.