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Old 12-01-2009, 05:15 PM   #113 (permalink)
jackbauer
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There are so called semiconductor protection fuses but i wouldn't bother. I only suggested it as back in the day i used to design hf ballasts for fluorescent lamps that used a push - pull mosfet setup and the most common failure was both devices turning on at the same time. I designed one with additional circuits that prevented this failure but the bean counters deemed it too expensive and made me remove the parts as it was cheaper to let a percentage of the ballasts blow then solve the problem! As the igbts are the most expensive parts it makes sense to protect them.
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