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Which is the failure mechanism of the IGBT?
Thermo-mechanical fatigue due to variations of power dissipation has been identified as a failure mechanism of IGBT. Die attach fatigue failure model was used in the CalceFAST software. The model was based on the Suhir’s interface stress equation coupled with the Coffin Manson equation.
How to troubleshoot ZVS flyback failure in MOSFET?
First you should run the circuit up on a current limited source like a lab supply or failing that a large idiot resistor. This will stop things blowing allowing further work. Now scope each Drain Source of each fet and you should see a half wave rectified sinewave.
What is the code for a Mitsubishi IGBT?
We were using Mitsubishi IGBT with the code CM400DY-24NF but had to change to Fuji IGBT 2MBI450U4E-120. These IGBTs are used in inverters and the inverters are used in solar energy applications and connected to solar panels.
Which is better MOSFET or BJTs for ZVS Royer?
The ZVS Royer started life with BJTs many decades ago. MOSFETs are better than BJTs these days but you need to do a bit more work to get some reliability. First you should run the circuit up on a current limited source like a lab supply or failing that a large idiot resistor. This will stop things blowing allowing further work.
What should I do if I Break my IGBT?
They usually need pretty massive cooling especially when currents go near the limits. After breaking the IGBT it may work somehow but definitely not properly (some kind of voltage or current can exist over / through the component). That’s quite usual with many semiconductor devices. For Stop IGBT , You need -15V (turn off signal) , No GND.
What should the gate voltage of an IGBT be?
The IGBT should be “Off” with a gate voltage of 0.02V, but instead I’m measuring a 4.3V drop across the 20 ohm load resistor (which is in place of the Coil shown in the schematic), meaning the IGBT is conducting .21A given a 20ohm load. I can only speculate why the IGBT failed, and I’m hoping someone that has experience can give me a better idea.
What causes the IGBT to close at low speed?
At low speed, the points will close, the IGBT will conduct, the capacitor will become fully charged, and much of the voltage will be dropped across the resistor. This means that the voltage across the coil and current in the coil primary will be low, resulting in less spark (delta current) as the points/IGBT open.