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Sorry, Yes it is a big custom automotive type that would like about 13 amps of field current. It is for a 12 volt system or two 8 volts in series so it needs to be adjustable. It's for someone else to build so I trying to keep the build simple. Right no I have a triangle wave an adjustable error amp and a comparator and driver feeding a big PFET. That may be as simple as it gets. I thought I might find a chip with an oscillator, and comparator in one IC, but I haven't been able to find one yet.
I may be wrong, but doesn't the rotating field in an automotive alternator only control the current output? Always thought/heard that voltage was a result of the number of turns in the stator winding. And the current limit was a result of the wire gauge used in those turns.
All the Alternators I have seen ARE VOLTAGE Regulated.
And I have Designed some replacement Voltage Regulators that work.
(They are on my WEBSITE)
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Hi Chemlec,
Are they bang bang? Or do they kind of ratchet up to maximum voltage?
Hi Chemlec,
Are they bang bang? Or do they kind of ratchet up to maximum voltage?
How about a 556? Use one half as a triangle generator and the other half as a comparator.I thought I might find a chip with an oscillator, and comparator in one IC, but I haven't been able to find one yet.
Thanks Alec. I was looking for ease of assembly, so was thinking of an IC with only an R & C plus the input to a comparator. But no joy. I'm beginning to wonder if I am making it to hard, because it looks like Chemelec's regulators just turn on the field if the battery voltage is below say 14.5 volts. It just seemed to me that with a 250 amp regulator something gentler might be in order. I was thinking just keeping the voltage above 13v under load.