Hi, im currently making an induction heater based on the following design: http://danyk.wz.cz/induk3_en.html
The only differences are:
-Im using 10ohm resistors instead of 22ohm
-instead of using 4 igbt's, i'm using an H-bridge igbt module (MG100Q2YS1) which has a max power dissapation of 800W.
-Im using 120vac 60hz instead of 220vac
-I have a 1kw heating element in series with the variac and bridge rectifier; it measures 20ohms.
-I have a 3200uf 250v dc cap instead of a 2200uf 500v cap.
Anyway, for some reason, when i turn it on the waveform (on my oscilloscope) never seams to change much, even when its tuned. I tried heating something up but nothing happened. A while back i had some nice mosfet modules instead of an igbt module, and when i removed the heating element and tried it they both blew up, including the ir2153 driver. I recently hooked up the variac output to a 500w isolation transformer and tried that. when i tried that it worked for about 2 seconds and then the variac started humming loudly. after turning it off i soon realized the resistance of my igbt module when in the off state was almost 0 ohms. Im guessing something burnt it out, but its rated for 800w and the isolation transformer was rated for 500w.
anyway, my questions are:
Why does my half bridge keep shorting when its practicly the same design as others that work. also, is my igbt burnt out? and if it is, how could it have happened when it was connected to a 500w isolation transformer.
What should i do to get this thing to work?
The only differences are:
-Im using 10ohm resistors instead of 22ohm
-instead of using 4 igbt's, i'm using an H-bridge igbt module (MG100Q2YS1) which has a max power dissapation of 800W.
-Im using 120vac 60hz instead of 220vac
-I have a 1kw heating element in series with the variac and bridge rectifier; it measures 20ohms.
-I have a 3200uf 250v dc cap instead of a 2200uf 500v cap.
Anyway, for some reason, when i turn it on the waveform (on my oscilloscope) never seams to change much, even when its tuned. I tried heating something up but nothing happened. A while back i had some nice mosfet modules instead of an igbt module, and when i removed the heating element and tried it they both blew up, including the ir2153 driver. I recently hooked up the variac output to a 500w isolation transformer and tried that. when i tried that it worked for about 2 seconds and then the variac started humming loudly. after turning it off i soon realized the resistance of my igbt module when in the off state was almost 0 ohms. Im guessing something burnt it out, but its rated for 800w and the isolation transformer was rated for 500w.
anyway, my questions are:
Why does my half bridge keep shorting when its practicly the same design as others that work. also, is my igbt burnt out? and if it is, how could it have happened when it was connected to a 500w isolation transformer.
What should i do to get this thing to work?