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Bridges in Hi-Reli applications
Bridges are very common in Hi-Reli applications such as aircraft and almost necessary for inverters and variable frequency drives. I'm curious to hear which type of industry exhibited these "recent rumblings" about using bridges. As a contractor I have a good opportunity to witness a lot of problems with all types of topologies. Problems such as this or that transistor getting too hot are secondary; The main problem I ALWAYS see is that a worst case analysis was not performed for extreme conditions. The reasons for this are varied; the engineer not given enough time to model it correctly, a new grad with no experience, customer pressure to ship it now, etc. The phase-shift bridge in particular, is tricky. Those of us who have designed using this topology know that it is absolutely necessary to analyze the operation at extreme conditions like minimum load, input voltage extremes, temperature, etc.
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