Austrian Company Develops Low Cost SOC Meter for Electric Scooters

AMS's circuitry can replace crude voltmeter with a State-of-Charge battery 'fuel gauge' for only €3 ($3.70).

Published: 17-Aug-2012

Unterpremstaetten, Austria: A reference design developed by AMS shows how a simple current and voltage measurement circuit can produce state of charge (SOC) readings for an electric scooter’s batteries. The company says that electric scooter manufacturers can replace today’s crude voltmeter displays with a fuel gauge while adding only €3 ($3.70) to the bill of materials.

Voltmeter displays typically offer a poor indication of the scooter’s range, since the output voltage at the batteries has a nonlinear relationship with SOC, and varies widely depending on the batteries’ load. According to AMS, its reference design meets the cost requirements of electric scooter manufacturers while delivering accurate voltage and current readings across the charge/discharge cycle, as well as across the battery’s operating temperature range.

The circuit uses the AS8510 sensor interface, which integrates data acquisition and data conversion in one chip. The interface also produces virtually offset-free current and voltage measurements across a wide dynamic range.

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