Patent ID: 11881784
Assignee: STMICROELECTRONICS S.R.L.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 11:
12. A method, comprising:
operating a flyback converter by
generating a drive signal, with a control circuit, to a first logic level for a switch-on duration for closing a first switch and a second logic level for a switch-off duration for opening the first switch;
generating a trigger with a valley detection circuit in response to a valley in a voltage at a second terminal of a transformer coupled to the first switch;
generating a switch-off signal with a comparison circuit in response to a current measurement signal of the transformer during the switch-on duration and a current measurement threshold signal;
generating a timer signal with a timer circuit, the timer signal indicative of a blanking time-interval elapsing;
generating a switch-on signal with a blanking circuit in response to the trigger and the timer signal, the generating of the switch-on signal including:
starting the timer circuit in response to the switch-on signal or the switch-off signal;
monitoring during each switching cycle a first number of triggers until the first switch is closed; and
monitoring during each switching cycle a second number of triggers until the blanking time-interval has elapsed.