ams has come up with a reference design which measures current to an accuracy of ±1% by monitoring the voltage drop across a copper track on a PCB. The development of the new technique, which uses the company’s AS8510 data-acquisition front end, enables designers of battery management systems (BMS) to reduce bill-of-materials cost by eliminating the precision shunt resistor normally used in current-sensing applications.
Accurate current measurement is an essential function in a BMS, which provides functions including monitoring of a battery’s state of charge and state of health. The new reference design board provides a blueprint for the current measurement function in a BMS, and can be applied in e-bikes, pedelecs and other applications drawing current of up to 40 A. The same design can also readily be adapted to measure currents of up to 100 A using only the resistance of a PCB’s copper track.
The new ams reference design takes advantage of the very high sensitivity and precision of the AS8510, an integrated data acquisition front end which provides two measurement channels. One channel is used to measure current by sensing the voltage drop over a 10 mm section of a PCB track with a known resistance value and temperature coefficient. The other, matched channel measures the temperature of the copper track. This temperature measurement can be performed either internally by the AS8510, or by an external temperature sensor.
By applying a compensation algorithm developed by ams, the AS8510 can eliminate the effect of the variation in the resistance of the copper track over temperature. This means that it can produce current measurements accurate to ±1% over its entire operating temperature range (-40°C to +125°C) without the normal requirement for a precision shunt resistor with a low temperature coefficient.
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