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thank you,
if i reduce the switching frequency to 50khz , is it possible to use the hgtg30n60a4d for 50a 50% duty cycle and 300VDC, i increased the switching frequency because my transformer saturates at low frequency and dont know why.
hi all,
i have 2kw two switch forward converter using two igbts and toroid transformer,
can you please tell me if this layout is good for such application and does it need more optimisation.
kind regards
thank you brian,
i used the two transistors because the igbt are far from the control ic and to reduce the noise due to long traces and high frequency.
about the d5 voltage drope , i think it is not so important because the drive supply voltage is 18v and even with 0.7v forward voltage it can...
Hi All;
i have designed a 100 A stick welder using two switch forward converter topology , i used a switching transformer from an old igbt inverter welder , my problem is that the standby current is too high and the igbts are too hot, i tried to increase the switching frequency from 70khz to...
Hi All,
i want to build 5kw welder inverter , so i want to choose a ferrite core for my transformer , the core is a toroid with T63 mm out diameter and 38mm in diameter and 25mm thick and without a gap (MnZn PC40 material), i want to use it in two swich forward converter topology, so is it ok...
the Load is almost less than 1 Ohm and i regulate the current to get 30A in the secondry , i get now less then 10A, can i change the working frequency to get this current ? then transformer i am using look like this in the picture it is 24:8 it is used in arc welding equipement.
Thanks Salvador12,
i have tested the circuit yesterday and it is working without blowing igbts only i have another problem know, with the 0.1ohm sense resistor i hope to get 10A in the primiray because of 1V voltage sense on the UC3845 pin 3 , but when i short circuit the secondry i could not...
I have routed the pcb again please take a look if it is good, i have removed the unkown current sense transformer with 0.1ohm sense resistor , i have also removed the gate drive transformer with IR2110 gate driver ic, is this layout best then the first one ?
Thanks Fvm
is it possible to limit the mains power supply current to 20A or 30A? , for Storage inductor i am using a transformer from an old Inverter Welder, you find attached the transformer and output terminal
1637658405
Thanks Fvm
is it possible to limit the mains power supply current to...
i mean the HV DC bus or the driver DC Bus !! i dont know the HV +320DC is decoupled with 2,2µF ceramic capacitor but for the gate drive ther is no decoupling
Ok for the Pcb layout , i will route it again, but do you have an idea where this negative VCE come from even with antiparalelle diodes on the transistors , the supply voltage is +310VDC and output is current limited with R4 potentiometer.
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