A customer let the smoke out of a H-bride motor driver I made for him,
so now I want to add reverse-power protection. My standard anti-parallel
1N4004 won't do much good when connected to a lead accu, so I am
considering a series diode (1N4004, or a schottky). But now the back-emf
from the motor, which is fed to the power rail by the 4 diodes, has
nowhere to go. What is the solution to this? A big zener on the power
rail, for let's say 150% of the maximum power supply? If so, which
wattage would be needed? Or maybe a consensator? If you, what capcity
and what type? Or are there other solutions, maybe with a polyfuse?

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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