zvs induction heater

Hello


I finaly made a zvs driver and since i dont have a flyback i made a induction heater with it , metal objects in the work coil dont glow red yet but get to hot to touch . after changing the power supplt and zener diodes from 12 volt to 15 metal 2-4mm think glows bright red now

I re made my coil and at first i didnt think it would work but after a few trys and some help on the internet i made my cap bank bigger with 8 capacitos now the MOSFEts are IRFP250 and the resistors are 10K and 470 ohm both 3 watt the zener diodes that go across the source pin to gate pin are 15 volts @ 5 watt .

today i changed the power supply to a 32 volts power supply with a 4700uf 50 volt capacitor to smooth the dc from the bridge rectifer and then its fed into the work coil and through the 470 ohm resistors the circuit is self ossilating

My new desing will be with IGBTs (insulated gate bipoar transistor) with a seperate gate controler circuit

Hope you like it


Thanks

ionlaser555

You can get a flyback from any old junked crt type monitor or tv. The zvs circuit is quite impressive with a flyback. I've used IRFP260 and 460 in this circuit. Nice little induction heater, btw.

billg519 said:

You can get a flyback from any old junked crt type monitor or tv. The zvs circuit is quite impressive with a flyback. I've used IRFP260 and 460 in this circuit. Nice little induction heater, btw.

Click to expand...

Thanks glade you like it here are some more pics of the final setup with a larger cap bank

ionlaser555 can you please post a schematic of ur zvs induction heater? i built this one http://www.nickhv.com/img/Highvoltage/Flyback/ZVS driver.jpg but the mosfets get absolutly smoking hot and the screwdriver i put in doesnt get that hot. i would greatly appreciate it. TY

Induction heating is fun stuff. The one I used in industry many years ago was ~450 kHz. BIG vacuum tube at about 1 kW. It would heat a bolt to red but no hotter. We used it for soldering and didn't need more heat.
What is your freq and power?

HMike

Hemlock_Mike said:

Induction heating is fun stuff. The one I used in industry many years ago was ~450 kHz. BIG vacuum tube at about 1 kW. It would heat a bolt to red but no hotter. We used it for soldering and didn't need more heat.
What is your freq and power?

HMike

Click to expand...

Hi

Power in is 50 volts @ **** current , psu is rated for 7 amps but not sure on current draw , i have updated this ZVs in the pic power supply was 35 volts not 50 when i get my caps sorted out ill let you know the frequiency

all the best

ion

In a way they're like lasers...

You ALWAYS want/need MORE POWER!

Your circuit is not going to heat much with less than half a kW.

Check out what 4kW will do!

YouTube - Induction Heater Fun