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Registered Member #1614
Joined: Wed Jul 30 2008, 03:08PM
Location: Argentina
Posts: 52
hi, I've tried with 33 turns and 33 ohms resistor on secondary ,the ferrite core is small so I can't use more than 40 turns on it and first reason because I don't like to wound cores :) , and one as a primary.
I used 0.1 uF so relation is 146( tank is 14.6uF) . the peak voltage was 3V on oscilloscope and sec current would be 3V / 33 Ohm = 0.091 A. primary current would be 0.091A X 33 turns = 3A and finally tank caps current would be 146 X 3 = 438A ??? may be like 20% less it would be 350A, too much current!!! tank peak voltage was 160V but power may be low because a low power factor of the load
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Hi I have to made some good IH, for friend I have APT150GT120JR IGBT, they are fast, but don't have body diode. For MMC i think use 100 wima FKP1 capacitors, (600V 47nF) so total will be 4,7uF. with that capacity, and normal size work coil have to be 60-70KHz resonant frequency. But what driver should i use ? maybe PLL ? also need startup frequency, so in my opinion PLL have to best solution. Can some one give link for tested circuits ??
Registered Member #1614
Joined: Wed Jul 30 2008, 03:08PM
Location: Argentina
Posts: 52
Hello all, Linas this is the circuit of my IH , the PLL controller is based on excellent Uzzors circuit with some changes, it works perfect and it runs locked close to resonant freq.
Registered Member #1614
Joined: Wed Jul 30 2008, 03:08PM
Location: Argentina
Posts: 52
this is my setup ,the coil and capacitors are located away from the inverter, recently I built a water cooled matching inductor with variable gap adjust with stepper motor to open or close the core. I also find large rating mosfets IRFPS43N50. It runs with 11A from the mains. I use a pic 16f873 to monitor and control the inverter alarms and water temperature of the capacitors and workcoil
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induction heater resonance
