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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Today i started to try out a boost converter, and this is the first time ive ever used a IGBT. After i made the oscillator (it works, tested with LED), i hookedup the output signal to the IGBT. When i tried it, the LED didnt turn on, so, i switched the the + and -. Now, the LED blinks, but VERY dimly (didnt even notice it at first). The oscilator and the IGBT power supply is a regular 9v, and no resistor connected to the LED. Why is it so dim? Is this just the leakage?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Considering that you can see the LED blinking the frequency should be more than low enough for the rise/fall times to be negligible. How is the LED hooked up, in series with the IBGT? Mayhap 9V isn't enough to fully turn on the IGBT, however this is unlikely. Give us the IGBT number too.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
the LED drawing power was the problem, when i switched to an enigizer battery, it worked, even better when i removed the LED. I put the inductor with it, but i keep getting the 9v battery votlage, but once it jumped to 20v
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
The nine volt battery is your problem. It just cannot source enough current to do much. You'll get a 1uF cap to about 600V, and an 80uF cap to about 60. Assuming the battery has full charge. Get a bench supply, or use a stack of AA, C, or D cells. With a boost converter, an eight pack of AAs can charge 1440uF to 240V in 30s. I assume you can draw better current from the Cs and Ds, because my AAs were roasting at the end of three charge cycles. They were hot enough to warp the metal springs holding them in the battery case.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Update: It turns out i didnt ground the IGBT, so it somewhat works now! I hear a humming from the inductor, The IGBT gets slightly warm (barely noticable, not on a sink). It uses a 9v for the timer, and a laptop powersupply for the IGBT. I used abounch of resistors in parrallel to current limit it. The voltage goes to 45V pretty quickly, and goes really slowly from there, im currently timing it (capacitor is 200v 680uf). Fine tuning is obviously needed.
EDIT: its been 5min 30sec, and its charged to 85V, i also get a nice shock from the output =) I need to put everything good, and not just twist wires, everytime i touch it, the frequency changes. Oddly, when i put a big ferrite core on the inductor, nothing happens.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Ile try using the laptop power supply for both. I got it to 104v before noticing the IGBT was hot, so i disconnected it. The IGBT is now on a heatsink.
Turnout i put a wrong connection so the laptop power supply wasnt doing anything and the 9v was the main power supply =p. Now it goes to 70v in a few seconds, but no higher, so im guessing this is the peak?
To change the peak, do i just need to play with inductance and frequency? or just feed more power? The IGBT can handel 600v. 30A.
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555-IGBT
