Electronicdesign 7288 0514edeams
Electronicdesign 7288 0514edeams
Electronicdesign 7288 0514edeams
Electronicdesign 7288 0514edeams
Electronicdesign 7288 0514edeams

Battery Board Measures Current Without Shunt Resistor

May 8, 2014
AMS’s latest reference design board measures current to an accuracy of ±1% by monitoring the voltage drop across a copper track on a printed-circuit board (PCB).

AMS’s latest reference design board measures current to an accuracy of ±1% by monitoring the voltage drop across a copper track on a printed-circuit board (PCB). The new technique uses AMS’s AS8510 data-acquisition front end, which features high sensitivity and precision with 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.

The new reference design is intended for small electric vehicles such as e-bikes and electric scooters. It can be used in applications drawing up to 40 A, but the design can be adapted to measure up to 100 A.

AMS

Sponsored Recommendations

Board-Mount DC/DC Converters in Medical Applications

March 27, 2024
AC/DC or board-mount DC/DC converters provide power for medical devices. This article explains why isolation might be needed and which safety standards apply.

Use Rugged Multiband Antennas to Solve the Mobile Connectivity Challenge

March 27, 2024
Selecting and using antennas for mobile applications requires attention to electrical, mechanical, and environmental characteristics: TE modules can help.

Out-of-the-box Cellular and Wi-Fi connectivity with AWS IoT ExpressLink

March 27, 2024
This demo shows how to enroll LTE-M and Wi-Fi evaluation boards with AWS IoT Core, set up a Connected Health Solution as well as AWS AT commands and AWS IoT ExpressLink security...

How to Quickly Leverage Bluetooth AoA and AoD for Indoor Logistics Tracking

March 27, 2024
Real-time asset tracking is an important aspect of Industry 4.0. Various technologies are available for deploying Real-Time Location.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!