09-06-2017, 05:29 AM
Finally got around to having another look at this and opened up the "rectifier/regulator" . This one picured is a cheap Chinese jobbie I got to replace the original Yamaha one. It's different to the Yamaha one, it had a little "sub" board in, the Yam one didn't. On the sub board were a few SM diodes and resistors, nothing else. I suspect the diodes are underneath the potting.
I've knocked up a schematic. as you say Sam there are six diodes in pairs in series. Getting a likely diode to replace this box was tricky. most dual diode packages are common cathode or anode. These are the ones I bought, should do the job - http://uk.farnell.com/ixys-semiconductor...dp/1080104 These are dual series, meaning they have a tap at the junction of cathode and anode.
What is puzzling me is that there isn't any regulator of any sort elsewhere on the bike. So current/charge is constant to the battery. There's no smoothing cap either, which I guess is pretty standard for bike charging systems. I don't suppose it needs it exactly, but it seems like a good idea to put some sort of regulation inside the box if I can get it to fit. A simple fold back/feedback into an op amp which controls a series pass tranny.
However current demand isn't constant. For normal running a trickle charge is sufficiant, but when the lights are on you need full charge. Any ideas for a simple regulator?
Andy.
I've knocked up a schematic. as you say Sam there are six diodes in pairs in series. Getting a likely diode to replace this box was tricky. most dual diode packages are common cathode or anode. These are the ones I bought, should do the job - http://uk.farnell.com/ixys-semiconductor...dp/1080104 These are dual series, meaning they have a tap at the junction of cathode and anode.
What is puzzling me is that there isn't any regulator of any sort elsewhere on the bike. So current/charge is constant to the battery. There's no smoothing cap either, which I guess is pretty standard for bike charging systems. I don't suppose it needs it exactly, but it seems like a good idea to put some sort of regulation inside the box if I can get it to fit. A simple fold back/feedback into an op amp which controls a series pass tranny.
However current demand isn't constant. For normal running a trickle charge is sufficiant, but when the lights are on you need full charge. Any ideas for a simple regulator?
Andy.
