12C509 to MOSFET H-Bridge ... how to avoid shorts?
James Cameron email (remove spam text)
I wish to have bi-directional PWM control over a small toy 9V DC motor,
from a PIC 12C509, so I guess I would set up a H-Bridge using four logic
level MOSFETs, but I have a few newbie questions;
a) can I use MOSFETs of the same polarity top and bottom of the bridge?
b) are there any simple tricks I can use to reduce damage in case the
prototype code manages to switch MOSFETs so as to short the supply?
(This is another Technical Aid to the Disabled project. For a disabled
child so they can run their toy railroad. The control unit will receive
a UHF remote control signal as three TTL inputs, a valid transmission
line and two contact closure signals. One switch will mean go forward,
the other switch go backward, but I don't really want to use relays to
do it; the effect would be far too abrupt.)
James Cameron (stl.dec.com) cameron
Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800
See also: www.piclist.com/techref/io/motors.htm?key=h%2Dbridge
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