High-voltage on-chip current sensor design and analysis for battery modules

Chua-Chin Wang; Zong-You Hou; Wen-Je Lu; Sheng-Syong Wang

High-voltage on-chip current sensor design and analysis for battery modules

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Author(s): Chua-Chin Wang ¹ ; Zong-You Hou ¹ ; Wen-Je Lu ¹ ; Sheng-Syong Wang ¹
- Affiliations: 1: Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan
Source: Volume 10, Issue 6, November 2016, p. 492 – 496
DOI: 10.1049/iet-cds.2015.0374 , Print ISSN 1751-858X, Online ISSN 1751-8598

Received 20/01/2016, Accepted 28/07/2016, Revised 27/07/2016, Published 01/11/2016

Large current sensing in a high-voltage (HV) battery module or string is hard to be realised on-chip. Thus, it is a disadvantage for the system to be miniaturised. A current sensor with a HV sense stage on silicon for HV battery modules is designed and analysed in this investigation. The proposed HV current sensor takes advantage of HV CMOS processes and resolves the problems caused by the voltage drop limitation thereof. The design methodology and analysis, including aspect sizes, are also presented. The physical on-chip and system measurement of the proposed HV current sensor demonstrates maximum error ≤ ±0.7% provided that the sensing voltage is 36–55 V, and the sensing current is 0.5–2.2 A.

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High-voltage on-chip current sensor design and analysis for battery modules

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