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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
c4r0, I'm just wondering why did you choose to parallel feed the tank circuit? I tried the exact same setup, and an almost identical matching transformer, but I used a series feed to the tank. And the weird thing is, it worked about as well as yours :-/
My heater drew 7A at 30V and its performance was limited by the tank capacitors getting too hot.
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
wrote ... is that still at the same input power?
Yes, max 150W. I'm using a fullbridge made of irf820's (very cheap ) and i'm keeping voltage under 100V and current draw under 1,5A.
wrote ... c4r0, I'm just wondering why did you choose to parallel feed the tank circuit? I tried the exact same setup, and an almost identical matching transformer, but I used a series feed to the tank. And the weird thing is, it worked about as well as yours :-/
My heater drew 7A at 30V and its performance was limited by the tank capacitors getting too hot.
Actually i don't know I thought that parallel circuit will draw the smallest current from secondary winding in resonance (with the biggest current in tank circuit at the same time) , in contrast to serial circuit (the biggest current through primary in resonance). This is my coil with capacitors.
The capacitors doesn't get too warm. But the coil is soldered to caps and after about 30s of work the tin melts (becouse the coil gets red hot) and the coil comes off I saw induction heater on your site, and actually i took the idea of using a transformer in my circuit from there I was amazed how it can work so well without a heatsink on mosfets.
Registered Member #78
Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133
Nice work c4r0. I think the >1000 temp is accurate enough. Those metal parts look just like the coins which i was heating just before they were about to melt. You might want to invest in some thin copper tubing to make a water cooled work coil for longer runs
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Induction heating
whoa
) and i'm keeping voltage under 100V and current draw under 1,5A.
I thought that parallel circuit will draw the smallest current from secondary winding in resonance (with the biggest current in tank circuit at the same time) , in contrast to serial circuit (the biggest current through primary in resonance).
