 suggestions for simple low power, 1 volt converter
|
|
|
kell
|
|
Registered Member #142
Joined: Sat Feb 11 2006, 01:19PM
Location:
Posts: 102
|
_______________
| | )
| | )ign.
| '--||--, )coil
| |___)
| |
| c / MJE13009
+6 volts ---+---10R---| or MJE18008
e \
|
|
points
|
|
ground
It started with the cascode circuit above. I used it for running an old 6 volt motorcycle. It works, but I wanted to improve it. The old bike has a generator with not much electrical power to spare, so I considered using a voltage conversion circuit for the base drive to the transistor, in order to reduce the power draw.
So tonight I started experimenting with ways of driving the base. I breadboarded a simple buck converter and drove the transistor's base with that. Couldn't get a spark out of the coil when I switched the emitter. Then I built a simple linear voltage regulation circuit out of discretes for the base drive, just to see what would happen. Very hard to get a spark out of the coil.
Now, the original version using a power resistor works so well, I can get fat sparks no matter what I use for a switch, even a frayed wire-end.
But using active circuitry for the base drive seems to kill the whole thing.
I guess this cascode switching has more to it than first appears.
Edit: Got it work using a buck converter driving the base of the transistor with about 2.5 volts.
|
|
Back to top
|
|
Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob
|
|
Powered by e107 Forum System
|
