Current and voltage monitoring module for EVs and energy storage

January 20, 2017 // By Graham Prophet
Sendyne has launched an automotive-grade current and voltage sensor module with 1% accuracy for battery monitoring in high voltage systems such as electric vehicles and energy storage systems (ESS).

The SFP200 current and voltage measurement module is the first turnkey module capable of precisely measuring currents from mA to kA, while simultaneously measuring three high-voltage potentials (800V nominal, 1000V/channel max) accurately. Designed for electric vehicles (EVs) and Energy Storage Systems (ESS), this automotive grade member of Sendyne’s SFP family communicates via an isolated CAN 2.0B interface at up to 500 kbit/sec.

The company focuses on technologies for battery system management including current, voltage and temperature measurement ICs and modules, and modelling and simulation tools. It aims to address issues associated with large-scale storage, to improveand superior performance in terms of battery pack utilization, enhanced cycle life and accurate capacity prediction to enable cost reductions.

For high voltage systems where there is a need to constantly measure current and voltage to monitor the state of health (SOH) and state of charge (SOC) in batteries, Sendyne says that, “There are many Hall effect based products but because of our patented method, we are able to inexpensively measure currents with a ±1.0% accuracy without any problems associated with Hall effect sensors.”The module incorporates Sendyne’s SFP200 IC and the company’s 18 μΩ shunt. It measures current with an accuracy of better than ±1.0% (typically ±0.5%) over the entire operating temperature range of –40 °C to +125 °C. For state-of-charge (SOC) estimation, the SFP200MOD provides separate charge, discharge and total Coulomb output. The module can be powered from a wide voltage supply rail of nominal +5/+9/+12/+24/+36/+48V without any modifications or adjustments.

The SFP200MOD is fully isolated and capable of attachment onto either the high side or low side of a battery (or anywhere in between). Unlike Hall Effect sensors, the SFP200MOD is impervious to noise and errors commonly associated with such magnetic-type measurement modules.

An evaluation kit consisting of the module, CAN to USB translator, cables, and demonstration software for PC platforms is available for $250.

www.sendyne.com