High-current sensors target HEV and mild-hybrid power trains

August 31, 2015 // By Graham Prophet
Melexis has added to its IMC-Hall Advanced current sensor portfolio with high current devices targeted at hybrid & mild hybrid vehicle power measurements. The devcie joins the MLX91208 series of programmable Hall-effect current sensors.

Designed for the very high fields that characterise hybrid and electric vehicle (HEV) applications, the MLX91208CAV can cope with up to 1000A of primary current. This device complements the existing MLX91208 products which cover low field and high field functions.

Using integrated magnetic concentrator (IMC) technology, the sensors in the AEC-Q100-qualified MLX91208 series can accurately measure current without the need for inclusion of the bulky external ferromagnetic cores that are required for conventional Hall-effect current sensors. The IMC structure concentrates the magnetic flux and thereby enhances sensor performance. Melexis’ IMC-Hall devices enable significant savings in board real estate and simplify the assembly process as they are housed in compact surface mount standard SOIC8 packages. These sensors enable current data to be measured through adjacent bus bars, wires, or underlying PCB traces, with precision and efficiency.

Based on the Hall effect, the MLX91208CAV provides a fully cost-effective, contactless current sensing mechanism that meets required performance benchmarks. This device intrinsically delivers the galvanic isolation mandated by high voltage applications, while simultaneously eliminating the additional sources of power loss of shunt technology.

Melexis adds, “High current sensing is inevitable, in order to reach the power requirements of HEVs. There is also the emerging mild hybrid segment to take into account, where lower power motors/generators, along with a lower voltage net, dictate high currents. The MLX91208CAV [addessses] the relatively high expense associated with inverter hardware, which until now has slowed down widespread HEV adoption, by allowing migration to smaller, higher power density inverters.”

Melexis; www.melexis.com/Current-Sensors/IMC-Hall-Current-Sensor-ICs/MLX91208-824.aspx

and www.melexis.com/FameOfHall