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Okay, so I was thinking of a way to add some regulator circuitry to my tiny ZVS charger, and this is what I came up with:
Would this work at all? I'm not sure if I got it right with the LED transistor, but otherwise the other transistor should turn the thing off when the desired voltage is reached right?
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
Nice LED killer! Let's see if I can fix it for you...
there you are, use two 1k resistors, a TIP135 and a small signal NPN transistor of your choice. The cap to the left is 100n. Add pull-ups/pull-downs as you like (not mandatory).
I've built a regulated zvs inverter for my studio flash unit project from which I've mspainted you this schematic (I don't have the eagle files right now). I'm using some opamps (I buffer the sense voltage from the divider and implement a comparator with hysteresis that in turn controls said NPN transistor.
Hmm...thanks for the help, I'm a noob when it comes to doing this kind of thing. There's gotta be a way around the "big" TIP135. I actually have to use a PNP for the LED, as I see that now. I should be able to just get away with that shouldn't I? Granted i'll have to add a limiting resistor to the LED, but it should work. I might also have to change the 1k trimmer to a 10k trimmer...
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
You can also use a simple PNP transistor, the gate drive current isn't that high (calculate the collector current according to the beta and base resistor of the parts you choose and make sure the PNP is saturated). I suggest putting the LED in a base current path. That isn't good practice but it works fine and saves the extra current if you can afford the voltage drop across the LED.
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Modded regulator of uzzors2k's charger
