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a lossless charge recovery takes place
Good analysis. Powertint seems to have copied the method for their LinkSwitch-II application - without explaining the operation principle. In older applications notes, they used a classical RCD snubber (a fast recovery diode without a series resistor).It seems to improve efficiency by a percent or 2 and best of all uses inexpensive parts.
larrymeares said:I saw this practice in China several years ago. Evidently the long recovery time keeps the snubber connected to the input and a lossless charge recovery takes place.
see https://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/4448710/4448711/04448797.pdf?arnumber=4448797
for technical details.
It seems to improve efficiency by a percent or 2 and best of all uses inexpensive parts. The technique also works for MOSFET gate drives.