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Using supply power 66321D Mobile Battery Emulation

Question asked by Stonner on Dec 10, 2010
Latest reply on Nov 25, 2013 by wbendler

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Hi everyone,

Recently I adquire a 66321D Agilent power supply and I'm a little bit confused.

At every application note, users guide or quickstart guide agilent says how to measure and test my device power consumption, but at anyware says anything how to simulate the battery.

Anyone knows how can I configure (or look for information or application notes) the power supply to simulate one specific tipe of battery??

Thanks everyone.

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StevenLee Dec 14, 2010 10:40 AM
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Hi Stonner,

This power supply doesn't allow the user to choose the specific type of battery that he wants to emulate. Basically, the output behavior mimics that of a battery in general and not really any specific type. For example, this transient response of the 66321D output is very very fast compare to that of other power supplies. A fast transient response is a characteristic of a battery(technically a battery doesn't have transient response since it is not a feedback system) but its along the line of thought. Hopefully this is helpful but do let me know if you more questions or concerns. I support this instrument so I can go over setup and point you to the right sources if needed. Thanks.

Steven Lee
Applications Engineer
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Stonner Dec 14, 2010 1:15 PM
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Hi Steven,

First of all, thanks for the help

You said that the supply mimics a battery in general and not really any specific type, but in some pdf´s says other thing, for example:

At the overview pdf says: "These dc sources simulate the effects of internal resistance of the battery, enabling them to emulate the operation of various battery types or batteries in different charge states."

And at the User guide pdf says: "Programmable output resistance lets you emulate the internal resistance of a cell phone battery, which causes the voltage at the phone to drop as the phone draws more current. Different types of phone batteries have different internal resistance values, which typically fall in a range of everal hundred milliohms."

what about this?

Thanks.
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StevenLee Dec 21, 2010 12:56 PM
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Hi,

You are correct. The internal resistance is a setting that you use to mimic certain type of batteries. Some types of battieres just by design tend to have a higher internal resistance than others. I misunderstood your earlier question. I thought that perhaps you were looking for a menu option that would say "lithium-ion", "nickel-cadmium" , or "nickel metal-hydride". Then it would load a setting that mimics the various internal resistance and somehow the effects of the differnces in chemical compisition as well into the output setting. But your thoughts are correct, you can set the internal resistance to mimic your specific battery.

Steven
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Stonner Jan 25, 2011 4:49 AM
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Hi,

I've been testing the Source and I don't fully undertand how it works.

I program the voltage, current and resistance, I connect a load (a resistance at this case) and I let it doing measurements for one complete day (24 hours).
but the output voltage of the source dosen`t move at all, I mean, the output voltage was the same at the beginning and at the end. (I've been doing the measures with the sense input not with the DVM)

my question this time is, Do I need to program anything (apart of the voltage, current and resistance) so the source can mimic the a battery? or the source do the mimic itself?

thanks.
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StevenLee Jan 25, 2011 9:09 AM
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Hi,

I think there is misunderstanding here in terms of how this power suppply works. If you leave it on over a long period of time, the voltage will not drop as you would expect from a real battery. That's not the type of emulation that this power supply was designed to do. What this power supply was designed to do is give you charactertistic the current drain during differetn operation on your DUT. If you DUT was a mobile phone, texting, watching videos, talking, running apps, idle, sleep, etc... those would all require different levels of current drain and this power supply allows you see these current drain charactertisics as they happen. So if running a certain process, draws too much current or too high of a current burst, the design can go back and design the process different hence optimizing the battery life.

Steven
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Stonner Jan 27, 2011 5:17 AM
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Hi,

Then if the powe supply dosen't mimic the voltage drop of a real battery, how can i estimate the battery duration during a test of mi dispositive?

thansks.
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StevenLee Feb 2, 2011 12:39 PM
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Hi,

If you want to estimate the battery duration, the best way is to use an actual battery as the source rather than the power supply. Here is an application note that talks more about how to do this.

http://cp.literature.agilent.com/litweb ... 8157EN.pdf

Steven
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wbendler Nov 25, 2013 7:11 AM
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We have the 66321D and would like to use it to emulate a battery. Has anyone developed a program to control the 66321D to make it emulate a battery, with the voltage dropping and resistance rising? I am thinking we could hook our device up with a battery and use the 66321D to log the voltage vs. current, and calculate the resistance for each data point, then put that in an Excel file. But then we would have to write a Labview program to read the Excel file and control the 66321D to make it emulate a battery. I am hoping someone else has already written such a program.
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Using supply power 66321D Mobile Battery Emulation

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