18500343. AUTOMATIC REVERSE CURRENT ADJUSTMENT IN AN ACTIVE CLAMP FLYBACK CONVERTER (STMicroelectronics International N.V.)
AUTOMATIC REVERSE CURRENT ADJUSTMENT IN AN ACTIVE CLAMP FLYBACK CONVERTER
Organization Name
STMicroelectronics International N.V.
Inventor(s)
AUTOMATIC REVERSE CURRENT ADJUSTMENT IN AN ACTIVE CLAMP FLYBACK CONVERTER
This abstract first appeared for US patent application 18500343 titled 'AUTOMATIC REVERSE CURRENT ADJUSTMENT IN AN ACTIVE CLAMP FLYBACK CONVERTER
Original Abstract Submitted
According to an embodiment, a method is proposed that includes sensing a reverse current through a main switch of an active clamp flyback (ACF) converter. The ACF converter includes a flyback transformer and an auxiliary switch. The method further includes determining whether a sense voltage corresponding to the reverse current exceeds a threshold; decreasing a duration for the reverse current by an incremental time interval, the duration of the reverse current including a first incremental time interval, the duration of the reverse current corresponding to a duration that the auxiliary switch is activated; increasing the duration by a second incremental time interval greater than the first incremental time interval, the increasing being in response to the reverse current not exceeding the threshold; and activating the auxiliary switch for the duration to achieve zero voltage switching (ZVS).