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Yes, I measured with a dvm and while it was on the 160 watt load.
It might not be accurate but the difference stays the same percentage with a lighter load.
I haven't used the scope before to measure the voltage , as I'm not fimiliar with it, but I'll try to do it and see if I get more accurate...
I'm building a push pull dc to dc converter and when I measure the voltage on secondary of the ferrite transformer it gives me 25.5 AC output which is correct for the amount of turns on the secondary.
When I measure after the full wave rectifier , which consist of 2 mbr4045pt shotkky diodes I...
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These are my exact circuits but only the sg3525 are driving my 2xIR 2113 ic.
How can I try and...
I have all the mosfets on a large heat sink and all of them insolated with mica from the heat sink, but after putting the snubbers on they did Not even run to get hot. It's almost like they just shorted or got shoot through. I think the ringing I'm worried about is not to bad without the...
If I wanted to add snubbers to my circuit, would it be a good idea to have them from the source of my mosfet feeding back to the positive supply rail?
After inspecting closely I saw that there was ringing, a specially on low duty cycles and increasing gate resistors only made mosfets run hotter.
This is both HO signals from the full bridge pulling 600watt and on about 25% duty cycle.
Is it normal for mosfets to heat up when I pull small loads and it's running on 15 or 10% duty cycle?
Efficiency is good through all duty cycles.
A good idea to have a turn off R, say 2.2 ohm in series with a back facing schottky ( 40V 1A ) to give a fast turn off, and then a 47 ohm turn on resistor in parallel with the series combination - this gives 47 ohm turn on which makes less RFI and is easier on the other fet and the o/p...
Thanks easy easy, I only had to change the soft start cap, from 1 uf to 22uf, I left the discharge resistor on 10ohm becuase the fets still get hot on 47 ohm.
All that still bothers me a little is that q1 and q2 gets little hotter than q3 and 4 .
The voltage increase from 12 to 24 does not do anything to the dead time right?
Because the mosfets heated up with 47 ohm discharge resistor on the 12 volt.
Yes I'm running at 52khz but I'm not sure about dead time, I used a 4 ohm resistor on the 12 volts but having 10 ohms at the moment. Gate resistors are 5 ohms.
When I add resistance to the power load so that full power is not engaged, than everything runs normal and mosfets are not even heating...
The Ae of the core is 354 and I have adjusted the dead time also with no success. On the 12 volt I had a 4 ohm resistor on the dead time of the sg3525 .
I think maybe I should add more turns on the primary?
Also why I'm thinking my gate voltage is high , is because my low side mosfet is charging...
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