 Are IXDN630CI are any good for driving bridge of CM300DU-24NFH ?
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Steve Conner
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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
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The 25kHz figure for CM600s is for hard switching with an inductive load. We use zero current switching, and Mitsubishi doesn't specify them for this duty, but 50-60kHz seems like a reasonable upper limit. This is for the ordinary 1200V H series. The NFH may be faster.
There's a thread called "Goldilocks Gate Drive" that discusses the issues in great detail. To summarise, sometimes too fast gate drive can be bad.
Those fibre optic receivers have highly sensitive electronics inside. They need Faraday shielding when used around Tesla coils.
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teravolt
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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
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Steve
"Those fibre optic receivers have highly sensitive electronics inside. They need Faraday shielding when used around Tesla coils."
I agree. I generaly use a ground plane and lots of bypass and a shield it if necisary
there ar only a cuple of metods for getting isolation if one doesn't want to use a isolation transformer
and sofar I havent had problems with opts or fiber accept about 100ns of delay. supisingly I can get 100khz no problem from my driver using a genaric plastic fiber.
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