yellowduckduo(at)gmail.co
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 Posted: Mon Oct 30, 2017 7:00 pm Post subject: homebrew alternative to Ducati, etc regulators?? |
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Charlie, I agree that 80 watts dissipation while outputting 240 watts of
power is not impressive. I suspect it is tough to do a lot better on a
12volt system though. 20 amps through any full wave silicon bridge
arrangement is perhaps 30 watts lost and I'd guess at least another 20
watts from the buck converter inductor, mosfet(s), and diode. Such a
commercially built converter would be larger and more expensive compared
to existing after market offerings. Advantages should include a couple
more amps of output and a I think a generally cooler running stator.
I cobbled together a 50khz dc/dc buck converter for a 120 volt solar
array for perhaps $30. of parts so a homebrew should be doable if one
really wanted to. The output from my unit is electrically fairly noisy.
Ken
On 30/10/2017 5:06 PM, Charlie England wrote:
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<ceengland7(at)gmail.com>
With all the regulator failures on Rotax (insert version here)
regulators, I've been wondering about whether the job could be
accomplished using a different tack.
What about a diode bridge using diodes that can handle the higher
frequencies being generated by the 'wild' output from PM dynamos,
followed by a 'buck' style switching regulator that could withstand
the fairly high DC voltage that would result from high rpm and low
load. Both the diode bridge and the 'switcher' might well be
off-the-shelf items, that could be wired together to get a very high
efficiency DC output. If I've been correctly interpreting some of the
data on the traditional regulators, their efficiency is atrocious
(which probably helps explain the horrible failure rate). A bit of
filtering might be required to clean up the switcher's noise, but the
idea seems worth exploring. If I had a dog in the hunt, I'd certainly
take a shot at something like that.
Charlie
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