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Registered Member #1819
Joined: Thu Nov 20 2008, 04:05PM
Location:
Posts: 137
Fnord wrote ...
I have to agree there. The little flyback charger I just finished is only a 2x2x2" cube, and it'll put out an easy 50J/second with an 18vt cordless drill battery. I haven't even tweaked it yet for max power output.
The power density is impressive. What is the size of the flyback?
Anyway, with more specifications, it would be easy to help you optimize your design. I can, however, give you two tips. Higher input voltage gives higher charging rates, which should be fairly clear. Lower inductance for a given frequency (in your case, primary inductance,) also gives higher charging rates, along with increased ESR-caused voltage spikes. Inductor / flyback saturation, however, must be taken into account in order to use these quick-fix methods, since both involve higher peak currents.
Fraggle wrote ...
On a Go-Kart you could use a pulsed alternator.
This is referring to a compulsator, right? If you somehow get your hands on one of those, you would need a gasoline engine to power it. Using a motor would somewhat defeat the purpose of using a compulsator.
Registered Member #2004
Joined: Sat Feb 28 2009, 11:43PM
Location:
Posts: 39
killah573 wrote ... The power density is impressive. What is the size of the flyback?
The core itself is only like 1.5" x 2.2", so it fits under my driver circuit board easily. Since the windings are my own they don't stick out much. If you'd like to help a noob out, I made a post in "smoking flyback resistors" rambling about decreasing my output voltage/increasing output power.
I'll provide any specs you want, but I may not be able to measure stuff like inductance.
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one hell of a battery pack
