A 0-to-60V-Input VCM Coulomb Counter with SignalDependent Supply Current and ±0.5% Gain Inaccuracy from -50°C to 125°C Caspar van Vroonhoven

📋 论文概要

本文提出一种适用于电池荷电状态(SOC)监测的库仑计数器，能够处理0至60V的输入电压，并采用信号相关供电电流技术以降低功耗。在-50°C至125°C的宽温度范围内，实现了±0.5%的增益精度，解决了传统库仑计数器功耗高、易受偏移漂移影响的问题。

💡 主要创新点

• 提出信号相关供电电流技术，使功耗随输入信号动态调整，降低平均功耗。
• 实现0-60V宽输入电压范围，适应多种电池系统。
• 在-50°C至125°C宽温度范围内保持±0.5%的增益精度，提升可靠性。

🏷 关键词

📄 原文摘要

charge, (SOC). A straightforward way to determine SOC is to keep track of the current flowing in and out of a battery, a method known as coulomb counting. Compared to other methods such as voltage or impedance monitoring, coulomb counting is simple to implement, does not require complex algorithms and is independent of cell chemistry. However, coulomb counters must operate continuously and essentially integrate forever; traditionally, their relatively high power consumption (several tens of µA, e.g. [1-3]) and susceptibility to drift in the presence of offset have prevented their more widespread use. This work presents a coulomb counter that has a very low operating current and charge drift. Figure 23.3.1 shows the system diagram. An external current-sensing resistor (RSENSE) converts current to VSENSE, which is first filtered and then digitized by a charge-balancing switched-capacitor integrator. Whenever the integrator

👥 作者与机构

Analog Devices, Ismaning, Germany, Most battery-powered systems require measurement of the battery's state of