Multifunction DAQ

cancel
Showing results for 
Search instead for 
Did you mean: 

Lithium polymer battery noise in DAQ

Solved!
Go to solution

Hello

 

I am operating a NI cDAQ-9172 chassis with a NI9234 card as a portable unit, currently powered by sealed lead acid batteries. I was considering replacing them with lithium polymer batteries to cute down on weight. However, I am concerned about possible noise from the battery management systems li-po batteries have. Anyone has experience with this?

Thanks

Jorge

0 Kudos
Message 1 of 4
(688 Views)
Solution
Accepted by topic author jorgepullin

I’m no battery specialist but it would seem to me that you are overanalyzing this a bit. The power supply input for these devices is designed to be connected to a relatively simple 12V mains power supply that is hardly a super stable DC power source but has a considerable ripple voltage. The device contains internally additional DC-DC converters to create its various stabilized voltages that it needs.

 

My concern would be more at environmental aspects LiPo batteries are not as robust as Lead-acid batteries and take to low and to high temperatures a lot more seriously, so that may be of concern for portable setups depending where you use them. Also the overall lifetime is usually considerably shorter unless you have a lot of charge-discharge cycles which Lead-acid batteries take more seriously than LiPo ones.

Rolf Kalbermatter
My Blog
0 Kudos
Message 2 of 4
(669 Views)
Solution
Accepted by topic author jorgepullin

I would not worry about the noise from Lithium BMS as a typical wall-adapter SMPS could be noisy than the BMS itself (there are very well built SMPS out there too). But the point is that cDAQ has internal regulators to provide the required stable supply for the chassis and cards. Don't worry about the noise from BMS unless it is a very crappy unreliable chinese Lithium pack.

 

 

Santhosh
Soliton Technologies

New to the forum? Please read community guidelines and how to ask smart questions

Only two ways to appreciate someone who spent their free time to reply/answer your question - give them Kudos or mark their reply as the answer/solution.

Finding it hard to source NI hardware? Try NI Trading Post
0 Kudos
Message 3 of 4
(659 Views)

Rolf, Santoosh, many thanks!

0 Kudos
Message 4 of 4
(654 Views)