US 12,306,256 B2
Sensor with self supplied negative rail for battery pack measurement
Jose D. Miranda, Peoria, IL (US); and Jason Lee Miller, Princeville, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Jul. 7, 2022, as Appl. No. 17/859,193.
Prior Publication US 2024/0012059 A1, Jan. 11, 2024
Int. Cl. G01R 31/36 (2020.01); B60R 16/033 (2006.01); G01R 31/385 (2019.01); H01M 10/42 (2006.01); H01M 10/48 (2006.01); H02M 3/07 (2006.01)
CPC G01R 31/385 (2019.01) [B60R 16/033 (2013.01); G01R 31/3644 (2013.01); H01M 10/425 (2013.01); H01M 10/482 (2013.01); H02M 3/071 (2021.05); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A battery management system configured to couple to at least one battery module, the battery management system comprising:
a first sensor including a voltage divider circuit and configured to sense a first voltage of the at least one battery module, the first sensor comprising:
an inverting charge pump coupled to receive a positive supply voltage and generate a first negative supply voltage; and
a differential amplifier coupled to the at least one battery module and supplied by the positive supply voltage and the first negative supply voltage generated by the inverting charge pump, the differential amplifier configured to generate an output representing the first voltage; and
a second sensor configured to sense a second voltage of the at least one battery module as seen by the machine, the second sensor comprising:
an inverting charge pump coupled to receive the positive supply voltage and generate a second negative supply voltage; and
a differential amplifier coupled to the at least one battery module and supplied by the positive supply voltage and the second negative supply voltage, the differential amplifier configured to generate an output representing the second voltage; and
a control circuit configured to receive corresponding outputs of the first sensor and second sensor and determine a value of the first voltage and a value of the second voltage.