Hmmm ... I guess I've been doing it all wrong for the last 25 years in
R/C combat hobbies. I almost always use a separate battery for the R/C
and control boards, keeping them completely isolated from the main
batteries that power the motors, relays and solenoids whenever possible.
That significantly reduces the chances of frying expensive electronics
when something goes horribly wrong on the main power grid, like (a)
drawing truly massive current when a motor locks up, (b) sending wicked
reverse voltage spikes back from strong relay/solenoid coils when a
diode falls off, and (c) shorting the main power grid with a screwdriver
which then welds itself to a battery terminal. I've seen all these
things, plus plenty more, happen to combat systems over the years. The
price and space required for a separate control side battery is a small
cost to pay to avoid losing all your electronics in those situations.
That's also why guys like Joe and I use opto-isolators when designing
circuit boards that handle large loads. Safe, cheap and easy to use.
Even if the greatest, most reliable FET in the world is being used, it
doesn't cost much at all to completely isolate the high-power side of
the circuit from the low-power side.
On 10/10/2014 4:14 PM, isaac goldman wrote:
The ground on the MCU and the low side dont connect to the same place
through what black magic? Or are you lugging a second battery around?
That sounds like a waste of space, and an additional thing to fail or
malfunction at the wrong moment.
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