It's supposed to be simple! big magnets spinning round a fixed coil on one side and on the other a battery and a hole load of bulbs. so i looked on the net to find a circuit to regulate and rectify or rectify and regulate. rectify was easy of cause, ether 1 diode for half wave or a diode bridge for full wave rectification. That just depends whether one side of the coil is hooked up to the mass or not.
now we come to the hard part: regulate. there seem to be two schools: clipper circuits or shunter circuits (if there is a difference?). clipper circuits use power transistors. shunt circuits use scr or triacs. both use zener diodes to detect over voltage.
now for the details:
coil dc resistance 0.247hm:
coil max power output 135w
open volts at idle 55Vpeak, 12Vrms
open volts at 6000rpm 137Vpeak, 30Vrms
idle with 3hm: load 39Vpeak, 10Vrms
wave form is a "sawtooth"
now for the circuits:
1st what i call a clipper circuit
**broken link removed**
when i "spice" this one it works well, but i'm told that it gets very hot because it limits 14A with all the volts the magneto can give (135w for 2 transistors)
2nd what i call a shunt circuit
**broken link removed**
but the problem is this is a cut down 3 phase circuit and doesn't work well. only one of the scr shorts and the zener diode doesn't change any thing.
PLEASE can anybody help me to understand.
Neil
now we come to the hard part: regulate. there seem to be two schools: clipper circuits or shunter circuits (if there is a difference?). clipper circuits use power transistors. shunt circuits use scr or triacs. both use zener diodes to detect over voltage.
now for the details:
coil dc resistance 0.247hm:
coil max power output 135w
open volts at idle 55Vpeak, 12Vrms
open volts at 6000rpm 137Vpeak, 30Vrms
idle with 3hm: load 39Vpeak, 10Vrms
wave form is a "sawtooth"
now for the circuits:
1st what i call a clipper circuit
**broken link removed**
when i "spice" this one it works well, but i'm told that it gets very hot because it limits 14A with all the volts the magneto can give (135w for 2 transistors)
2nd what i call a shunt circuit
**broken link removed**
but the problem is this is a cut down 3 phase circuit and doesn't work well. only one of the scr shorts and the zener diode doesn't change any thing.
PLEASE can anybody help me to understand.
Neil