US 12,449,482 B2
Distributed coulomb counter
Yijing Lin, Beijing (CN); Yiwei Bai, Shanghai (CN); and Yulei Nie, Beijing (CN)
Assigned to Analog Devices International Unlimited Company, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Dec. 9, 2022, as Appl. No. 18/064,099.
Claims priority of application No. PCT/CN2021/137061 (WO), filed on Dec. 10, 2021.
Prior Publication US 2023/0184842 A1, Jun. 15, 2023
Int. Cl. G01R 31/3832 (2019.01); G01R 19/252 (2006.01); G01R 31/367 (2019.01)
CPC G01R 31/3833 (2019.01) [G01R 31/367 (2019.01); G01R 19/252 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A battery management system comprising:
a host microcontroller, operated in accordance with a first clock signal;
a first analog front end (AFE) circuit, wherein the first AFE circuit is operated in accordance with a second clock signal that is unsynchronized with the first clock signal, the first AFE circuit comprising:
a first gain amplifier, including first gain amplifier inputs configured to receive a first battery current associated with one or more cells in a battery system, and first gain amplifier outputs to provide a signal representative of the first battery current and a gain setting of the first gain amplifier;
a first analog-to-digital converter (ADC), including first ADC inputs respectively coupled to the first gain amplifier outputs, and providing a digital output representative of the first battery current;
first digital circuitry to (1) accumulate a first value corresponding to a number of ADC sample cycles of the first ADC, and to (2) accumulate a second value corresponding to the digital output representative of the first battery current for the ADC sample cycles accumulated in the first value; and
wherein the first AFE circuit transfers a representation of the first value and a representation of the second value to the host microcontroller in response to a request from the host microcontroller.