Coreless Current Sensors with High Accuracy and TMR Elements Suitable for EV Charging Infrastructure

Murata has announced the new MRD series of open-loop current sensors that integrates high-performance tunnel magneto-resistive (TMR) elements – enabling precision measurement with regard to both DC and AC currents up to 40A, along with maintaining stable characteristics across an extensive temperature range. With high accuracy current sensing capabilities, these devices are suitable for a wide variety of applications like photovoltaic inverters, DC-DC converters, EV charging infrastructure, and power conditioning systems.

The coreless structure of these current sensors does not exhibit hysteresis effects or saturation issues which are typical side-effects with an iron core. It also results in reduced size and weight, as well as making mounting easier. Their proprietary differential measurement with two TMR-based elements gives immunity against external magnetic stray fields. This makes them suitable for use in application environments with high levels of electromagnetic noise.

Key Features

• High-speed response Typ 0.5 µsec (bandwidth: 1 MHz)
• High overall accuracy Typ 1.0%
• Differential method for canceling external magnetic fields
• Possible to select the bandwidth with a capacitor
• Analog output
• With thermal shutdown circuit
• Complies with the UL62368-1 safety standards
• SOICW16 package (10.3 × 10.2 × 2.8 mm)
• Power supply voltage: 3.0 V and 5.0 V
• Measurement range: AC (−25 to +25 A or −40 to +40 A) and DC (0 to 25 A or 0 to 40 A)

These MRD current sensors are compliant with the UL62368-1 electrical equipment safety standard and are supplied in SOICW16 packages.

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