Woo-hoo, a simple low-voltage synchronous rectifier circuit

February 2, 2007

If I only had a brain (left) I could have done this myself.

Actually, I am not 100% sure that this actually works. It did not simulate very well in Qucs. Maybe I made a mistake. It is not a very expensive thing to test in real life, so I will.

Here: http://www.solarbotics.net/library/circuits/misc_switching.html

Via here: http://groups.google.com/group/aus.bicycle/msg/c8734fd7ece1c485?&hl=en

Via here http://www.cyclingforums.com/showpost.php?p=2753864&postcount=44

Which I found among the 5 reported pages for googling “buckpuck synchronous”.

Why is this important? At low (bicycle generator, solar cell) voltages, a normal diode drop (0.7V) is a big hunk of the total voltage available. Step one in understanding the circuit is to understand that the MOSFET is run “backwards”, and its body diode is used as a “real diode” to kickstart the circuit.

I still need to check that this will work right when translated into its P-channel equivalent.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: