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What circuit, other than the royer, please, to create a good, high power oscillator, with a frequency between 200 khz and 1 mhz? The one problem I've whined about before, is that all of these oscillators alot of the time don't have any values, or high power, or either. I would prefer to use a MOSFET or IGBT in any of these oscillators, but a transistor would work too. Vacuum tubes...Are sort of out of the question, as I do not own any tubes, suitable for the application I'm trying to make. I'm experimenting with different oscillators to see which is the best in terms of component count, and efficiency.
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Gate driver driving a full-bridge inverter. Somewhat complicated, but well worth the work. Flexible, stable, VERY high powers, gets you any frequency your semiconductors can handle. $20 of IGBTs, $5 of IC's, and a couple dollars for a few small components will get you an inverter that can do 3KW+.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Inducktion wrote ...
What circuit, other than the royer, please, to create a good, high power oscillator, with a frequency between 200 khz and 1 mhz?
I would prefer to use a MOSFET or IGBT in any of these oscillators, but a transistor would work too.
Anything over 50khz and you should not use an IGBT. The switching losses get too high and they will overheat. Use a mosfet at this point. I may be off on the cutoff point, but for 200khz a mosfet is the way to go.
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
An induction heater uses induced currents to heat something up, or changing electromagnetic fields, not electromagnetic radiation. This section is for Lasers and Radios and such. This thread would get more attention in the General Science and Electronics section.
A gate drive circuit is just a circuit that sends a square wave into a GDT (gate drive transformer) that then controls the turn on of the half or full bridge. Uzzor has a general circuit here Note that he uses totem poles to drive the GDT. This works fine but a lot of people including myself prefer the UCC27322 or similar driver.
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Induction heater Oscillators
