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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I've recently designed a regulated cap bank charger circuit, which runs off of a 555 timer and two comparators. I'll post some videos tomorrow when I get back from school. It works perfectly!
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi inducktion
Have you considered using a royer oscillator to drive your transformer instead? You can enable and disable it quite easily by the same comparators, by controlling it's gate drive.
I once tried rigging up a simple "mazzili" circuit with IRFZ44's onto a ATX transformer hooked in reverse, and it seemed to give like few hundred watts without problems. I even pushed the transformer to some 600V out (although that caused it to heat a bit) and drove fluorescent tubes with it.
I don't know why anyone still uses the "NE555 boost converter" thing. It saturates the transformer heavily when driving a capacitive load, no good at all for this application.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
Nice work.
A couple of constructive criticisms:
1. The transformer in your schematic should have dots to indicate the relative polarity of the two windings. The circuit won't work if one winding is reversed.
2. Reference designators such as R1, R2, etc. are a good idea for several reasons. They allow a physical layout diagram to be invariant when you substitute a different R value or transistor type. They allow notes like "limit voltage is determined by R3" instead of "limit voltage is determined by the 1000 ohm resistor" -- what if there is more than one component of the same value as the one you are referring to?
Caution: if the cap bank is discharged into an underdamped inductive load, while this charger is still connected, your output diode is likely to blow when the capacitor voltage becomes negative and the diode begins to carry the coil current.
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Regulated Fly-back Cap Bank Charger (555 timer)
