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Simple Circuit Monitors Health of –48V Telecom Lead-Acid Battery Backup Systems

Authored on: Jul 1, 2011 by Jon Munson

Technical Paper / Product Paper

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The LTC6803 is a 2nd generation, complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6803 can measure up to 12 series-connected battery cells or supercapacitors. Using a unique level shifting serial interface, multiple LTC6803-1/LTC6803-3 devices can be connected in series, without opto-couplers or isolators, allowing for monitoring of every cell in a long string of series-connected batteries. Each cell input has an associated MOSFET switch for discharging overcharged cells. Read this paper to learn more.
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M. Oza Posted Feb 15, 2012

Dear Mr. Munson; I may have an application I could use your technic to monitor battery stack health similar to the -48V you have described in this paper. The difference is it is a +24V eith the battery negrative grounded. This application is in a Militay combat vehicles. I have tried to obtain your contact information Linear Technology technical help link. I am still waiting for an answer to my e-mail. Meanwhile, if you could please respond to to this request, I will appreciate. Thanksyou.

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Jon Munson Posted Feb 16, 2012

While the approach presented here would work fine for a two-battery system, if there are only two measurements to take (+12V & +24V), then there may be simpler ADC solutions than using the 12-channel LTC6803. On the other hand, if the 24V is made from a stack of say 7 or 8 Lithium cells, then the LTC6803 is an ideal monitoring solution.

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Tim W Posted Aug 22, 2012

I'm questioning the concept of telcos using 12V batteries. My experience is based on working in the local telco's switchrooms during college. The storage batteries were not 12V, they were 2.2V (one of my jobs was recording the cell voltages of the individual batteries). These batteries were about 1 foot wide, 2 feet deep, and maybe 2 1/2 feet tall, and were float charged at up to 100A. The apnote may apply more to a PBX system.

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