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Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
I'm driving my irfp064n with a sg3525 totem pole circuit. Up to 300 watt of power the circuit works fine but if I try and pull more power on the load the current draw On the primary gets very high making the the circuit very inefficient and heating up mosfets. At 400watt on the secondary im drawing over 600 watt on the primary from a 12 volt battery supply. I've tried different windings on my tranformer and even tried different transformers but the problem stays the same. So, should I limit the current and how would I do this efficiently? Or am I doing something wrong?
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
I'm switching at 23 kHz My cross sectional area on the core is 535 square mm and honestly I don't know what typ of material it is since I got it from a old board, and I've wound the transformer with copper foil, since it gave me a better result than the litz wire. But I've tried smaller cores as well that I removed from smps and the result stays the same. I can't seem to get the picture uploaded of my scope trace.
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
The foil is 0.10x30mm 1+1 turn ratio on primary and secondary is 65 Turns with 2mm litz wire with 0.18mm enamelled strands. Today I decreased the the secondary windings to 36 turns and succeeded in lowering the current on the primary side but couldn't get the desired voltage of 380, could only get it to 300 on a 75 watt load and 190volt on a 350watt load With battery still at 11.8 volt. Why such a huge voltage drop and ? And how will I reach the Desired volts with no voltage drop without increasing battery voltage?
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
2x100Ah lead acid
Is it a car battery low CC ratings or a 1000CC truck battery that can supply 1kA with minimal voltages drop.
You might be maxing out the current plus inductance which is the most Watts you can convert, either get a bigger inductor or wire the battery's for 24V.
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
It's car batteries and the voltage drop on the batteries are not to low because it's still above 11 volt which is still supposed to give me over 300 volt. Also the inductor is very large as you can see from the core section area, so it should easily handle 2000 watt, so converting to 24 volt as I've also tried just makes the problem worse. Shouldn't there be some sort of current limiting on the secondary side to maintain proper voltage output?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i need to see pictures, not sure why you want to current limit the primary, that may indicate saturation in which case your on time needs to be shorter.
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Push pull dc to dc converter inefficient
