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Registered Member #2310
Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169
hey! what happens if i try to turn the inverter part with 250vDC? are there risks of melting the fets(IRFP460s) ? changing the inductor, and feeding it with 41,2vDC @ 6A it was capable of warming a screw, that turned untouchable, i think it was about 140ºC The fets heated pretty well too...(I thought that they would work cool) but i have big dissipators now Current is limited, the maximum that i could achieve using a very tiny inductor was about 6~8A, so i was thinking if the amperage is limited to 2,5A 250V x 2,5A = 625 Watts A acceptable power level, for beggining...
Registered Member #2494
Joined: Wed Dec 02 2009, 07:16PM
Location:
Posts: 2
Hello
I build this circuit also - and it is not lucky for me :) i burn two ir2184 when i use 4.7ohm resistors from HO/LO to gates of mosfets. I change resistors to 22ohm and circuit start to working but....
When HO and LO are not connected to gates of mosfets signal is ok.
But when i make connection to mosfets the signal of HO looks like this:
Sorry this is paint - but signal on osciloscope is exactly the same.
Output from CD40106 is also ok - square wave of 50% duty cycle.
Someone can tell me what can be wrong ? Circuit is from:
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Half Bridge MOSFET Induction Heater Problems
