US 12,323,064 B2
Control method of ZVS flyback using transformer auxiliary winding
Zheng Ying, Shanghai (CN); Feng Wang, Shanghai (CN); and Bo Chen, Shanghai (CN)
Assigned to Diodes Incorporated, Plano, TX (US)
Filed by Diodes Incorporated, Plano, TX (US)
Filed on May 31, 2023, as Appl. No. 18/204,274.
Claims priority of application No. 202211200958.6 (CN), filed on Sep. 29, 2022.
Prior Publication US 2024/0113631 A1, Apr. 4, 2024
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2007.01)
CPC H02M 3/33523 (2013.01) [H02M 1/0058 (2021.05); H02M 1/0006 (2021.05)] 20 Claims
OG exemplary drawing
 
17. A method applied in a circuit for Flyback switching power supply, the circuit comprising a transformer having a primary winding and an auxiliary winding, wherein the method comprises:
generating a control signal based on a voltage at a common node of a first capacitor and the auxiliary winding, wherein the circuit further comprises a first switch, a first terminal of the first switch is connected to a non-dotted terminal of the auxiliary winding through the first capacitor, a second terminal of the first switch and a dotted terminal of the auxiliary winding are connected, respectively, to a ground, and the common node of the first capacitor and the auxiliary winding is configured to connect to a non-dotted terminal of the primary winding;
controlling, based on the control signal, to turn on the first switch of the circuit to perform zero voltage switch of a power switch of the circuit.