Surface mounted high isolated current sensors measure from 6A up to 30A

November 26, 2019 //By Julien Happich
current sensors
LEM’s HMSR series of miniature, integrated circuit sensors for AC and DC isolated-current measurement can handle overload current bursts of up to 20kA (8-20 us surge test profile), such as those that occur in photovoltaics applications while still providing a reinforced isolation.

Products in the series are designed to measure currents of up to 2.5 times their nominal ratings of 6A, 8A, 10A, 15A, 20A or 30A. Packaged as SO16 surface-mount devices with a height of just 6mm, the sensors can be mounted directly onto a printed circuit board in the same process as other board-level components. This helps reduce manufacturing costs and decrease the overall footprint, vital for space-constrained applications. As a result, HMSR sensors can be readily built into small form-factor intelligent power modules (IPMs). The HMSR series uses a proprietary Open Loop Hall effect ASIC associated with a unique low-resistance primary conductor to minimise power losses allowing direct current measurement and high transient overload currents to pass without damage. The use of a ferrite for the magnetic element is a key factor in achieving a high frequency bandwidth of 270 kHz (-3dB) and to provide good rejection against external fields. The unique mechanical design for the sensor leads to creepage and clearance distances of 8mm using materials with comparative tracking index (CTI) of 600, the whole to meet reinforced isolation according to the IEC 60950-1 standard.

An integrated EEPROM is used for programmable internal temperature compensation to counter offset and gain drifts and perform gain stress compensation. These measures ensure high-performance overall accuracy over the full range of temperature, from -40 to +125°C with a typical value of 0.5 % of IPN for the HMSR 20-SMS model, a significant improvement over the previous generation. The HMSR series achieves a shorter response time: 2 µs typical.

LEM - www.lem.com


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