Yep, Running anything at 100% load rating seems less safe than running it at 1/10th of the load rating as suggested here.
Someone I think mentioned the failure mode of this type silicon device is that it will short circuit. I agree, shorting is the more common failure mode in my experience. Back in the day we replaced dozens of silicon semiconductors every day, when found one we'd say "That was a transistor, now it's brass." or diode or whatever.. very few failed open. even fewer failed "noisey" as if there was an iffy connection inside. In this circuit if the part were to fail in that most common mode (highly unlikely at 1/10th rated load) the ignition would continue to operate due to the device is in series with the load. That's convenient. It would fail, and you would not notice until the next runup test. Still not experiencing an ignition failure even while shorted. jg On Fri, Nov 18, 2022, 06:39 Jeff Scott via KRnet <krnet@list.krnet.org> wrote: > > FWIW, the Mercury Outboard engine I had used that same bridge rectifier to > rectify the AC output from the Dynamo to DC, then was regulated downstream > from there with a voltage regulator. One side of the Dynamo coils failed > with the other side still working, effectively making the rectifier a half > bridge. That caused the voltage regulator to go to full voltage driving > the voltage to 18V. I smoked a number of those rectifiers, a voltage > regulator, and 3 CDI modules before I finally found the problem in the > dynamo coils. So, no, those bridges won't survive long if they are running > at full current capability. But that kind of demand is rare unless there > is another problem driving it. > > -Jeff Scott > Arkansas Ozarks > >
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