On 12/08/16 00:19, Clive George wrote:
On 11/08/2016 16:55, Capitol wrote:

Then get some kind of hub based alternator featuring Neodymium
magnets and as lot of iron and copper with a bridge rectifier and some
seriously large capacitor to drive a smart inverter that would provide
a stabilised battery charge and light driving circuit coupled to some
decent high intensity LEDS with or without strobing.

Normal day riding would recharge the battery, and at night one would
hope that the alternator would be enough to at least drive the lights
except when stopped.

Too inefficient, the forward volt drop is well over 1V can be as
high as 3V I believe.

The generators on bike lights are slightly more complicated. They're
designed to current limit, which means you get 0.5A or so at most speeds
- but if you increase the resistance, you get more than 6v. So 3V volt
drop isn't necessarily that big a deal - though I'd try a bit harder.

What TNP is describing is close to what people use in real life - though
the battery backup isn't needed, it's just a capacitor.

These days the line between a battery and a supercapacitor is
increasingly blurred.



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