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IGBT ZVS FOR higher voltage?

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Dri0m

Thu Jun 07 2012, 03:52PM

Registered Member #4497 Joined: Thu Apr 19 2012, 12:53PM
Location: Behind you
Posts: 62

hello,

do i need some modifications for running ZVS with IGBTs, powered by 60-80V (i will rewind my MOT), and on high frequency (1MHz) ?

This IGBTs look OK , and they are quite cheap ($3) and fast enough to do the job.

probably more powerful zeners on higher voltage, better cap, but should i change resistors or choke coil?

Dr. Dark Current

Thu Jun 07 2012, 04:02PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

There is possibly no way you can get this circuit running at 1 MHz, even more so with IGBTs.

Dri0m

Thu Jun 07 2012, 04:12PM

Registered Member #4497 Joined: Thu Apr 19 2012, 12:53PM
Location: Behind you
Posts: 62

i ran my ZVS induction heater on 7MHz with IRFP250N...

1MHz will be used for powering tesla coil (why not hm? :D )and other air-core stuff, DSTs will run on lower f...

Thomas W

Thu Jun 07 2012, 06:47PM

Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276

if i am correct, the FETs in the inductionheater didnt acctualy go at 7MHZ, they caused a "ringing?" between L and C that is 7 Mhz

im probibly wrong tho ^^

Dr. Dark Current

Thu Jun 07 2012, 09:52PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Maybe he measured the frequency with a multimeter, which "counted" the ringing too.

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