Hello from San Diego:
> One thing that might be a problem is if the heat sink of the primary
> switching
> transistor is grounded.
>
> Then it might be difficult to reinforced isolate the primary switching
> transistor as changing the isolation material will also influence the heat
> conducting properties and thus the life span of the transistor.
Agreed.
However, in the power supplies that I've worked with
recently (50 W max input), the heat sink is either
floating or connected to the negative DC rail. I
believe the negative DC rail is better for EMC than
floating, and may be better than ground. Perhaps our
EMC colleagues could comment on the least EMC connection
for switching transistor heat sinks?
Best regards,
Rich
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