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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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Simple answer - yes.
How much ? I dont know.
In our application (low switching rates <20Khz), probably not very much, but I havent seen a characterisation of the effect anywhere yet.
In low PWM rate motor, low voltage, high current controllers, The effects are probably swamped by thermal characteristics from the sustained high current flows. You could ask on the OSMC mailing list.. There are a few real mosfet guru's on there.
Mosfet switching is reminiscient of the pneumatic guys discussing designs for high flow valves for Co2. It seems like it should be simple, but its not.
Diverting large flows of any sort of energy suddenly always seems to involve far more factors than you would have even thought existed. Switch lots of current fast enough, and you suddenly have a radio transmitter (maxwells equations) and capacitances, self inductance and so on start popping up all over the place and screwing things up.
in summary. High dI/dt = Big Trouble.
A reference for you start at
http://www.smps.com/Knowledge/MOSFET_Switching/FETsw_p3.xml _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Mon Mar 26, 2007 9:26 pm |
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