Back to results
US 12,627,239 B2Granted
Synchronous rectification control method for resonant power supply by optimizing maximum condition width for turn-off time
AssigneeDelta Electronics, Inc.
InventorsLin-Ya Tsai, Chien-An Lai
Life of this patent
Estimating the term…
Abstract
A synchronous rectification control method for a resonant power supply includes steps as follows. First, setting an initial conduction width of a synchronous rectification switch, which is less than a maximum conduction width. Afterward, detecting a voltage waveform across two ends of a body diode of the synchronous rectification switch. Afterward, calculating a resonant frequency according to the voltage waveform. Finally, determining the maximum conduction width of the synchronous rectification switch.
Claims9
A synchronous rectification control method for a resonant power supply, comprising steps of:
- setting an initial condition width of a synchronous rectification switch, wherein the initial condition width is less than a maximum condition width,
- detecting a voltage waveform across two ends of a body diode of the synchronous rectification switch,
- calculating a resonant frequency according to the voltage waveform, and
- determining the maximum condition width of the synchronous rectification switch,
- wherein turning on the synchronous rectification switch at a first time, turning off the synchronous rectification switch at a second time, and turning on the synchronous rectification switch at a third time;
- calculating a first time difference between the second time and the first time, and calculating a second time difference between the third time and the second time;
- selecting the smaller of the first time difference and the second time difference as the maximum condition width.
4 more elements
Dependencies are inferred from the claim text.