SMPS Efficiency - bad... - Page 2

luka · 9th February 2012, 08:07 AM

this is pretty good now, you could find out, where you loose most of the power

PChi · 9th February 2012, 08:09 AM

I wouldn't be ashamed, getting anything to work is hard. I worked on a vehicle system where the voltage drop down between the battery and the inverter was about 2 V until it was rewired.
I think that the efficiency looks quite reasonable.

I'm not sure of your circuit but at 6.12 A the SR5100 is a little ungenerous. I have looked at a data sheet from MOSPEC and the forward voltage is curving up beyond about 3 A. It is typically 0.7 V at 5 V according to the graph. So higher current rated schottky diodes might gain a little improvement.

At high currents I have had success making high current transformer windings with copper strip.

dtproff · 9th February 2012, 05:42 PM

Congrats on the efficiency. Rule one is always check the fuses (meaning check the simple stuff first).

Good job.

Tony

9th February 2012, 08:07 AM	#11
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	this is pretty good now, you could find out, where you loose most of the power __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

9th February 2012, 08:09 AM	#12
PChi diyAudio Member Join Date: Jan 2012 Location: Staines, UK	Thanks for the update. I wouldn't be ashamed, getting anything to work is hard. I worked on a vehicle system where the voltage drop down between the battery and the inverter was about 2 V until it was rewired. I think that the efficiency looks quite reasonable. I'm not sure of your circuit but at 6.12 A the SR5100 is a little ungenerous. I have looked at a data sheet from MOSPEC and the forward voltage is curving up beyond about 3 A. It is typically 0.7 V at 5 V according to the graph. So higher current rated schottky diodes might gain a little improvement. At high currents I have had success making high current transformer windings with copper strip.

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9th February 2012, 05:42 PM	#13
dtproff diyAudio Member Join Date: Oct 2008 Location: Plano, TX, USA	Congrats on the efficiency. Rule one is always check the fuses (meaning check the simple stuff first). Good job. Tony

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