Switching power supply circuit with synchronous rectifier and associated control circuit and control method
US10951124B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2019 |
| Grant date | Mar 16, 2021 |
| Priority date | — |
| Expiry date | Dec 18, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply circuit has an energy storage component, a synchronous rectifier switch and a synchronous rectifier control circuit. The synchronous rectifier switch is coupled to a secondary side of the energy storage component, and the synchronous rectifier control circuit turns ON the synchronous rectifier switch based on a drain-source voltage across the synchronous rectifier switch when a primary switch is judged as turned ON. When the switching power supply circuit is not operating in a preset mode, the primary switch is judged as turned ON when the drain-source voltage remains larger than a dynamic reference voltage during a preset window time period, and when the switching power supply circuit is operating in the preset mode, the primary switch is judged as turned ON once the drain-source voltage is larger than the dynamic reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.