Agreed, but the SCR in picture 4 or 5 in post #1 only gets warm, though it is also acting as shunt regulator.Any shunt regulator will involve components getting hot, since the shunt action has to dump excess generated power somewhere
Agreed, but the SCR in picture 4 or 5 in post #1 only gets warm, though it is also acting as shunt regulator.Any shunt regulator will involve components getting hot, since the shunt action has to dump excess generated power somewhere
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.
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.I am wondering if this regulation provides any protection to the lamps.
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.
Does that means it won't serve the purpose? I was thinking that spikes are repeated so quickly that the lamps would have 14V.the "steady about 14V" is in fact a series of 14V spikes with a 2.77V RMS value.
I have read somewhere that at 13.8V the lamps would have bright light with 500 hours life.Very pretty pictures, what voltage are you looking to achieve, ?
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.
But I feel that will not make a big difference because the regulated AC voltage keeps on increasing with the RPM.So set the zener to give that voltage then!
Better still, use a TL431 zener and a variable resistor to give the precise voltage.
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