Patent · US Active

Synchronous rectification control for flyback converter

US10158297B1 · kind B1 · utility

5Cited by

0References

12Claims

0Family size

Assignee

Infineon Technologies Austria AG · AT

Inventors

Xiaowu Gong · Singapore, SG
Marc Fahlenkamp · Geretsried, DE
Anthony Sanders · Weißenfeld, DE

Key dates

Filing date	Jun 20, 2017
Grant date	Dec 18, 2018
Priority date	—
Expiry date	Jun 20, 2037

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B70/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A flyback converter includes a primary-side switch connected to a primary-side winding of a transformer and a secondary-side switch connected to a secondary-side winding of the transformer. The flyback converter is operated by controlling the primary-side switch to store energy in the transformer during ON periods of the primary-side switch, switching on the secondary-side switch synchronously with switching off the primary-side switch to transfer energy from the transformer to the secondary side, determining an off time of the secondary-side switch based on a reflected input voltage measured at the secondary-side winding when the primary-side switch is on, accounting for a settling time of the reflected input voltage when determining the off time of the secondary-side switch so that the settling time has little or no effect on the off time, and switching off the secondary-side switch based on the off time.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.