I would like to know whether the AD5593 can be designed to measure Lithium-Ion battery impedance?
Whether the answer is YES, can any one please help me to setup the EVAL-Board to measure battery impedance.
The range of the impedance to be measured is between 0.05 to 10 ohm
I don't see a listing for this particular part on the Analog Devices website. Can you confirm the part number?
EngineerZone Community Manager
Sorry, I meant AD5933 Impedance to digital converter IC
May you provide the range of impedance you want to measure?
At the moment this range of resistances is really small.
Im working in a new AFE to adapt the AD5933 to this impedance.
I'll keep you posted if I get something.
I will wait patiently for the result,
I have many clients who are interested in incorporating a circuit that can measure battery impedance, into there product.
I know this I`m a bit late regarding this topic.
But did you made any progress regarding to a new AFE to measure an battery impedance with the AD5933?
I`ve succesfully managed to measure an "normal" passive impedance but now i would like to measure a complex impedance of a battery but the AFE needs to be improved i guess cause of the small battery impedance.
We did few test in a new AFE... due to the noise the error was too big.
We are working now in a different approach so hopefully the noise is lower and we may be able to measure the impedance.
I'll update this thread with any update.
thanks for the quick response.
Can you provide some information material regarding the testes AFE?
I would like to include AD5933 and the capability of it in a lecture at my university.
Right now, I do not have too much info... the whole idea is basically amplify the signal using low noise devices, as the gain is around 130k.
I can provide schematics if this helps (attached)...
The main difference between the previous approach an this one is the excitation source... the board operates at 3.3V but battery could be up to 12V so, we need to isolate somehow the current source from the load... originally we use a capacitor but due to the size of the capacitor to avoid a HP filter attenuation, the opamp was getting unstable... so, we decided to use an external NPN transistor to do the job.
The reasons to use the AD5933 are,
Is a discrete solution so, requires less space and power than a discrete solution
The signal is digitally processes which makes the system more robust to noise/errors
Let me know if you need more details, please
thanks for the information regarding the AFE. Is there a way to private message you?I don`t want to spam the forum with maybe "stupid ideas".
Anyway I would suggest to help with the topic and to test some ideas regarding the EIS on "real" batteries.
Before it was a way to send private email thru the EZ itself...
I dont know how but it can be sent....
Can you please provide more detail on the attached schematic
What do you want to know exactly?
I would like to know whether the attached circuit schematic was build and tested and how it works with more details
on the design.
I have a request from a client (medical product) to design a battery impedance measurement device as a part of a bigger system
By measuring the battery impedance in system client will be able to know when to service the system and replace a battery before it fault.
The design schematic provided by you might help me answer my client request
I am also interested in measuring impedance of the battery and in your product detail it says that the frequency resolution is 0.1 Hz is it possible to reduce the frequency resolution to around 1 miliHz
You can find many people in this forum trying to do similar things (reducing excitation frequency).
Please check and let me know any question, please.
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