Turbo Royer/Baxandall in boost configuration

It kinda reminds me of a TV video DC restorer circuit from tube TV days - it used grid leak to generate the needed bias.

Joe Gwinn

If you want to compare an older stone tools and animal hide version to the newer part simulations, you can fool with this one, which uses the LTC version of jellybean UC3842 and self-driven mosfet synchronous rectification.

The self-driven syncrec was notorious for self-oscillation on application of voltage to it's output terminals (ie no input power applied). Could be good, could be bad, depending on what you want it to do . . .

It's always important to establish environmental design goals and limits, when working with any topology. None will do everything, but some can have distinct cost and performance advantages in specific applications, at specific times in history.

Some older articles:

RL

I am having trouble opening those zip files...

In my application, synchronous rectification is not an option; the secondary is a separate, existing module. The leakage inductance is relatively large and unpredictable, which is what led me to try the active clamp forward. And for bitrex's application, since output voltage is high and current is low, synchronous rectification seems unnecessary.

What are you using to open them? Winzip (free since forever) works.

Well, you can always dump it into a reservoir and recover it with anothere converter; use only as much energy in the clamp as you need for reset. Leakage energy is usually more than that.

Better use flyback with active clamp instead, for energy recovery. Lower power handling capability, though.

RL