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Registered Member #4254
Joined: Sat Dec 10 2011, 09:36PM
Location: Dhaka, Bangladesh
Posts: 27
Dr. Pork wrote ...
1. 1N4937 should work, yes.
2. Just wind the same number of turns on both of them! Use yellow toroids from PC power supplies. Do not use ferrite toroids.
3. Should work, providing your doubler caps are large enough.
4. What you said - and the L is inductance of the work coil, not chokes as some people think. In my case the circuit resonates with a 4uF cap at about 100kHz.
Marko
Oright then i have to collect old PC power supplies to get these toroids. If you can tell me the core-material or type of the toroids i would simply buy it from market and that would be waaay more convenient to me.
can i use IR G4PC50UD IGBT instead of mosfets and 20V zeners to maintain gate to emitter voltage?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi,
IIRC the core is the material 26 (Amidon/CWS) , probably has other names I don't know of, and is usually in a form of yellow-white toroid. I'm not sure if you can find those in typical local shops though! (for most people, it would be more convenient to pull them out!)
I wouldn't recommend using igbt's, their CE voltage drop is hard on the diode feedback thing as off voltage on the gate starts to get dangerously near threshold voltage... some people apparently got it working though you would need some low drop (prefferably schottky) diodes and still not push the voltage too high, perhaps up to 100V max.
IRFP260's are choice mosfets for this. The problem is that at higher voltages not only the ON resistance gets higher, but the diodes will tend to need to be bigger and have much greater forward voltage drop.
I used IRFP150's in my circuit, which enabled it to run up to 30V (my caps wouldn't take much more anyway).
Registered Member #4254
Joined: Sat Dec 10 2011, 09:36PM
Location: Dhaka, Bangladesh
Posts: 27
Dr. Pork wrote ...
Hi,
IIRC the core is the material 26 (Amidon/CWS) , probably has other names I don't know of, and is usually in a form of yellow-white toroid. I'm not sure if you can find those in typical local shops though! (for most people, it would be more convenient to pull them out!)
I wouldn't recommend using igbt's, their CE voltage drop is hard on the diode feedback thing as off voltage on the gate starts to get dangerously near threshold voltage... some people apparently got it working though you would need some low drop (prefferably schottky) diodes and still not push the voltage too high, perhaps up to 100V max.
IRFP260's are choice mosfets for this. The problem is that at higher voltages not only the ON resistance gets higher, but the diodes will tend to need to be bigger and have much greater forward voltage drop.
I used IRFP150's in my circuit, which enabled it to run up to 30V (my caps wouldn't take much more anyway). 15 Marko
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IR2110 H-Bridge Inverter for Induction Heater
