-
公开(公告)号：US20200274438A1
公开(公告)日：2020-08-27
申请号：US16445421
申请日：2019-06-19
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru , Poornima Mazumdar , Marco A. Davila, JR.
Abstract: A leakage energy steering circuit for a flyback converter can include a leakage energy steering capacitor and a leakage energy steering diode configured to be coupled between a first output terminal and a first secondary winding terminal of a flyback converter. The leakage energy steering circuit can further include a reset circuit having an impedance element and a diode configured to be coupled between a junction of the leakage energy steering capacitor and the leakage energy steering diode and a junction of a second secondary winding terminal and a second output terminal of the flyback converter. The impedance element may be a resistor or an inductor.
-
公开(公告)号：US20240039398A1
公开(公告)日：2024-02-01
申请号：US17814902
申请日：2022-07-26
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru , Joao L. Andres , Marco A. Davila, JR.
CPC classification number: H02M1/4225 , H02M3/33507 , H02M1/0095 , H02M1/0032
Abstract: A power converter can include an input PFC stage that receives a rectified input voltage coupled to a flyback stage including a center-tapped primary winding magnetically coupled to a secondary winding and a main switch coupled in series with the primary winding. The output of the PFC stage can be coupled to the center tap of the primary winding, and an output of the power converter can be coupled to the secondary winding of the flyback stage. The converter can further include control circuitry coupled to the main switch and an auxiliary switch in the PFC stage that operates the main switch to regulate an output voltage of the power converter, selectively enables the auxiliary switch responsive to a low line voltage condition at the input of the power converter, and operates the enabled auxiliary switch synchronously with the main switch.
-
Search Results
2
records
(took 0.009 seconds)
