Transfer Loop Measurement of the power supply

luka · 13th November 2009, 04:45 PM

YouTube - Transfer Loop Measurement of the power supply

What do you think, will somebody try this?

JensRasmussen · 18th November 2009, 09:00 PM

Hi Luca,

Yes this method works... I use this way (but with a network analyzer) to measure the loop in e.g buck converters.

\\\Jens

luka · 18th November 2009, 09:18 PM

is that trafo really normal, 50-60Hz type, or is it pulse or some other type of trafo?

JensRasmussen · 18th November 2009, 09:36 PM

I use a small signal transformer, like e.g something from a single ended to ballanced LF converter. It does not have to be big at all.

What are you working on?

\\\Jens

luka · 18th November 2009, 10:26 PM

half bridge, slowly need to get the "feel" for feedback and current limiting, so new version will be in order. And if I do this, why not do it right, its about time for me

JensRasmussen · 21st November 2009, 04:58 PM

If you want to, I suggest you start with a buck converter.
You can make the loop simulation/calculation relativly simple, and verify results by measurements.
I am not an expert, but I will be able to help you with the simulations/calculations.

Warm regards
\\\Jens

luka · 21st November 2009, 07:44 PM

I'll keep this in mind, but for now, I need to finish 4ch car amp, that will replace my "old" AB amp

But if I ask, why buck? feedback is feedback and should work on any type of converter, right?

JensRasmussen · 21st November 2009, 07:51 PM

The Buck converter is the easiest to make a model of... and it has few part to blow if you insert too much signal in the loop while trying to measure

syn08 · 21st November 2009, 07:56 PM

That's what I'm using, works a treat.

krish2487 · 6th December 2009, 08:06 PM

hello...

i guess another paper on the same lines from national.

13th November 2009, 04:45 PM	#1
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Transfer Loop Measurement of the power supply YouTube - Transfer Loop Measurement of the power supply What do you think, will somebody try this?

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18th November 2009, 09:00 PM	#2
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	Hi Luca, Yes this method works... I use this way (but with a network analyzer) to measure the loop in e.g buck converters. \\\Jens

18th November 2009, 09:18 PM	#3
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	is that trafo really normal, 50-60Hz type, or is it pulse or some other type of trafo?

18th November 2009, 09:36 PM	#4
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	I use a small signal transformer, like e.g something from a single ended to ballanced LF converter. It does not have to be big at all. What are you working on? \\\Jens

18th November 2009, 10:26 PM	#5
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	half bridge, slowly need to get the "feel" for feedback and current limiting, so new version will be in order. And if I do this, why not do it right, its about time for me

21st November 2009, 04:58 PM	#6
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	If you want to, I suggest you start with a buck converter. You can make the loop simulation/calculation relativly simple, and verify results by measurements. I am not an expert, but I will be able to help you with the simulations/calculations. Warm regards \\\Jens

21st November 2009, 07:44 PM	#7
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	I'll keep this in mind, but for now, I need to finish 4ch car amp, that will replace my "old" AB amp But if I ask, why buck? feedback is feedback and should work on any type of converter, right?

21st November 2009, 07:51 PM	#8
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	The Buck converter is the easiest to make a model of... and it has few part to blow if you insert too much signal in the loop while trying to measure

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