A battery management system adapted for an energy harvester with a low-power state of charge monitoring method and a 24 microwatt intermittently enabled Coulomb counter
This paper presents a battery management system with methods for monitoring both the battery state of charge (SOC) and the discharge amount consumed by a wireless sensor device. The proposed SOC estimation method achieves a low-power operation by using a pulse-shaped input current to obtain the freq...
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Published in | 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) pp. 3556 - 3562 |
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Main Authors | , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.03.2018
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Subjects | |
Online Access | Get full text |
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Summary: | This paper presents a battery management system with methods for monitoring both the battery state of charge (SOC) and the discharge amount consumed by a wireless sensor device. The proposed SOC estimation method achieves a low-power operation by using a pulse-shaped input current to obtain the frequency-dependent internal impedance of a battery, and by eliminating the AC-source and sample-hold circuits which are conventionally required. The discharge amount from the battery is monitored with a proposed discharge-estimation algorithm that enables an intermittently enabled Coulomb counter (CC), which leads to low-power operation, keeping the error as low as 2.5 percent - the same result from an always-on CC. Measured power consumption has shown a reduction from 340 microwatt with a conventional always-on CC to 24 micro watts using the proposed method. These two techniques enable the power management system to achieve sub-milliwatt operation. |
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ISSN: | 2470-6647 |
DOI: | 10.1109/APEC.2018.8341617 |