- Joined Aug 17, 2010
The reg. in pic 4 is the Chinese unit (I haven't yet built that but I do have a spare unit).If you built the reg in pic 4 or 5, at what rpm did you test it? Did you have as much as 50V amplitude from the generator when not driving the reg?
My sim of that pic 4 reg shows about 20V (!) rms across a 6Ω load with a 100Hz (6000rpm) 50V amplitude input to the reg, and the SCR dissipating ~2.2W.
In that case, my design at post #15 gives much better protection. The only issue is that triac is getting very hot.Well, it's better than nothing. But with over 17V rms @ 6000 rpm the lamps will have a short life if they're rated for 12V.
Yes, I had used a DMM.What did you use to measure the regulator RMS voltages? A normal DMM is likely to lie, since it isn't receiving pure sine-wave input.
I note that in your sim file V1 has a 150sec delay parameter, so the frequency is fixed at 10Hz (600rpm) for the whole run-time. Is that intentional?
I was referring to this design which had a triac.Your only regulating half of the output, the Thyristor only conducts on the Negative cycle and shorts the alternator out, on the positive cycle it isn't conducting, so the full voltage is allowed out, why dont you put the thyristor across the bridge rectifier output, so it conducts in both cycles, then adjust the zener to suit.
Putting the SCR or triac across the bridge's output will make the design same as Sgt.Wookie's design see post #14. In that case, the bridge needs to be rated more than 15A which makes the size of actual regulator very big; and that is not feasible.why dont you put the thyristor across the bridge rectifier output, so it conducts in both cycles, then adjust the zener to suit.
No. Incandescent lamps have thermal inertia and "see" the RMS voltage.I was thinking that spikes are repeated so quickly that the lamps would have 14V.
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by Steve Arar
by Luke James