Control method of ZVS flyback using transformer auxiliary winding
US12323064B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2023 |
| Grant date | Jun 3, 2025 |
| Priority date | — |
| Expiry date | Feb 22, 2044 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for Flyback switching power supply includes a transformer having a primary winding, a secondary winding and an auxiliary winding, a power switch coupled to a dotted terminal of the primary winding, and a switch. A first terminal of the switch is connected to a non-dotted terminal of the auxiliary winding through a capacitor, a second terminal of the switch and a dotted terminal of the auxiliary winding are connected, respectively, to a ground. A common node of the capacitor and the auxiliary winding is configured to connect to a non-dotted terminal of the primary winding. A control circuit is configured to generate, based on a voltage at the common node of the capacitor and the auxiliary winding, a control signal to control the switch in order to achieve zero voltage switch (ZVS) of the power switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.