Paul,
I ran across this little ditty... very interesting... I think. [Note to self, get a life]
Check out page 60 of
http://www.sun-fly.com.cn/cn/UploadF...2153019195.pdf
Quote:
|
Originally Posted by Hewlett Package: Designer Guide
"This circuit includes a bootstrap circuit for providing output power to the HCPL-316J gate drive optocouplers, thereby Figure 4. Bootstrap Circuit for Power Control System eliminating the need for isolated power supplies or dc-to-dc converters. It can be modified to suit other HP gate drive
optocouplers and current/voltage sensing isolation amplifiers."
|
I think the gimmick is the lower drive stage has to be initially enabled to bootstrap the upper stage. I'm still analyzing it on paper, but I like what they have so far. I sent a message to AVAGOTECH asking for something like this. Wouldn't you know, right after I hit send, Google re-found this.