Melexis’ New Isolated Current Sensors Measure Up to 100 ARMS for High‑Voltage Power Systems

Melexis introduced two new isolated current‑sensor integrated circuits, the MLX91224 and MLX91225. They expand the company's current‑sensing portfolio for higher‑voltage automotive and industrial power applications by delivering isolated, plug‑and‑play current measurements up to 100 ARMS.

High‑voltage power systems used in electric vehicles, fast chargers, converters, and solar plants require accurate, fast, and safe current measurement. These ICs combine isolation with current sensing to keep measurement electronics on the safe side of high potentials while maintaining response speed and measurement range suitable for power‑conversion and propulsion tasks.

Engineers designing traction inverters, onboard chargers, DC/DC converters, photovoltaic inverters, and industrial power systems will consider these parts where isolation, wide dynamic range, and fast response are priorities. The plug‑and‑play aspect reduces integration work for measurement and analytics functions in power subsystems.

• Isolated current measurement rated to 100 ARMS, addressing higher current needs in EV and industrial power electronics.
• Fast response characteristics for real‑time control and protection functions.
• Safety features appropriate for high‑voltage environments, enabling safe separation between primary power rails and measurement/control electronics.

Design teams can use the MLX91224 and MLX91225 to replace or upgrade current‑sensing stages where isolation and high current capability are required. Typical integration points include: traction inverter current loops, battery pack sensing for diagnostic and control, DC fast‑charger current measurement, and grid‑tied inverter monitoring in solar installations.

• Integration effort: "Plug‑and‑play" suggests simplified board‑level integration compared with discrete isolation solutions, but designers should still verify isolation barriers, creepage/clearance, and thermal conditions for their specific system.

• Safety and certifications: verify that the device's isolation rating and safety features align with the target application's regulatory and system‑level safety requirements.

The new Melexis devices join other recent advancements in sensing and power conversion that aim to handle higher voltages and currents while simplifying system design. Related approaches in the industry include multiaxial sensing architectures for EV inverters and new converter topologies that manage 800 V systems. These MLX9xxx devices address the sensing side of that ecosystem by offering an isolated, high‑current measurement option.

For power‑electronics systems operating at higher voltages and currents—particularly in electrified transport, charging infrastructure, and renewable energy—these Melexis ICs provide an off‑the‑shelf isolated sensing option that can reduce integration time while supporting control and protection functions that need fast, accurate current information.