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10-500 MHz inductive heating

10-500 MHz inductive heating

10-500 MHz inductive heating

I am materials person wanting to heat ferrite powders in the low MHz range.  A US patent 5208443 (http://freepatentsonline.com/5208443.pdf, column 11 of text) has some equipment description for making a small coil (for <40MHz) that would work (although the freq range is limited).  The description appears to be just connect a power supply to a transmatch to a coil - is it that simple?  It seems that there should be a signal source as well?  Any advice about parts to make this kind of system or a broadband version would be greatly appreciated.  Of course low power and/or shielding will be needed...

RE: 10-500 MHz inductive heating

Using induction heating within that frequency range seems strange to me.

The common frequencies for induction heating are in the range of line frequency to several MHz, but I never came across an installation operating at more than 10 MHz.

You always need some king of matching ciruit, in the lower frequency range switched capacitors, for the higher frequencies a matchbox consiting of variable capacitors or inductors.

I will check the patent later and provide additional hints if necessary.

RE: 10-500 MHz inductive heating

13.56 MHz is a common frequency for such machines.

RE: 10-500 MHz inductive heating

The power supply is a multi-kW radio transmitter.  The matching circuit needs to be low-Q to tolerate large changes in load Z.  I have worked on a 10KW 40MHz device used for welding plastic.  

RE: 10-500 MHz inductive heating

I worked on one (multi KW RF gen) back in school on a Tokomak reactor.  We would tune it manually while watching a loose flourescent bulb lying across the cables.  ie "Tune for maximum smoke".

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