Current sensor boosts BMS accuracy
Melexis’ new MLX91216 XHF current sensor is suited to redundant monitoring of battery-management systems (BMS), over-current detection in smart fuses, and measuring phase currents in traction inverters and boost/recuperation inverters. With user-programmable filtering to adjust resolution, response time, and bandwidth for optimum signal-to-noise ratio, the sensor features built-in diagnostics, including broken-wire detection.
The SOIC8 surface-mount device contains Melexis’ patented Integrated Magnetic Concentrator (IMC) that enables accurate contact-free measurement of busbar current in combination with a simple U-shape magnetic shield. When mounted on a PCB, the sensor is positioned over the busbar, within the shield, allowing easier assembly than conventional Hall sensors. What differentiates the proven IMC-Hall technology from coreless solutions is that position is much less critical. The design can accept more mechanical movement because the measurement is not dependent on a magnetic field gradient. Other technologies that are can result in very severe bus bar machining causing important thermal hot spots.
On the other hand, IMC-Hall technology carries the advantages of coreless technologies, so it lends itself to smaller assemblies with surface mount package solutions. This avoids the use of more complex through-hole packages that often require specific lead bending/forming native to core based solutions.
The MLX91216 XHF extends the family of Melexis IMC-Hall sensors that provide accurate, high-speed current measurement for a wide range of automotive and industrial applications.
MLX91216 High field (HF) versions: 200 to 600 A
MLX91216 Very High Field (VHF) versions: 400 to 1200 A
MLX91216 eXtra High Field (XHF) versions: 800 to 2000 A
Available now, the MLX91216 XHF is AEC-Q100 Grade-0 qualified for automotive applications and operates over the temperature range -40 °C to +150 °C. The sensor has a wide measurement range from ±20 mT to ±350 mT with linearity down to ±0.2% full scale, 2 μs response time, and high thermal stability with offset drift below 5 mV and sensitivity drift within 1%.
More information: www.melexis.com
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