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Science Forum Index » Electronics - Components Forum » How can I switch 100 Amps at VERY low voltage?
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| Guest |
 Posted: Sun Feb 04, 2007 11:10 pm |
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Switching control comes from the bridge...
I've got a good start with all the info this thread has provided - thanks to
all!
Quote: I'd be inclined to look at a rotary switch for the sort of rates you are
talking about. But it will be a very special rotary switch! |
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| Gary Reichlinger |
| Posted: Sun Feb 04, 2007 11:45 pm |
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On Sat, 03 Feb 2007 23:40:33 -0600, jdworley@hiwaay.net wrote:
Quote: What I need to do is supply 100 ADC to a .001 ohm load
and reverse the polarity to this load every four seconds.
I'm seeking a (least expensive) solution that can be used in
lieu of multiple relays because I believe most contactor
relays within my budget would be short-lived.
You never mentioned just what you plan to use for your original
power supply to get the 100 ADC. If you can allow some dead time in
between transitions, turning the power supply on and off might be the
easiest way to go. This is essentially what I was talking about with
the buck converter multiphase approach. The converter would actually
be converting the power from a higher voltage/lower amperage source. |
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| Mook Johnson |
| Posted: Mon Feb 05, 2007 9:31 am |
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I would recommend having the driver IC very close (within 1 - 2 inches) of
hte modfet gates. I would also recommend putting a small 10 ohm resistor
directly to the gate and a 16V zener between the gate and source of each
mosfet. This will kill and oscillation between the wiring undctance ang the
gte capacitance and clamp and spikes that might make it get on the gate.
You don't want long wires between the driver and the mosfets.
I would strongly recommend twisting the source and return wires for the 100A
to reduce the amount of magnetic field generated. |
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| John |
| Posted: Mon Feb 05, 2007 11:07 am |
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"Gary Reichlinger" <reichln@navix.net> wrote in message
news:1s9ds29hbkpc1tb9hhi6l56omp5cp5jpra@4ax.com...
Quote: You never mentioned just what you plan to use for your original
power supply to get the 100 ADC.
Yeah, he did. See his post in this thread for Sunday, February 04, 2007 1:04
PM. |
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