Low-profile current transducers

November 2009 Sensors & Transducers

LEM’s new isolated current transducer family operates from a single 5 V supply.

LEM has extended its range of current transducer families designed to operate from a single +5 V power supply with the introduction of the HMS model. The new unit measures only 16 x 13,8 x 12 mm and integrates the primary conductor. It is designed for direct surface-mounting onto a printed circuit board for reduced manufacturing costs.

Four standard models are available to cover nominal AC, DC, pulsed and mixed isolated current measurement of 5, 10, 15 or 20 A(RMS) up to 50 kHz. The same mechanical design is used for all four models so that they can be used to measure current in a wide range of applications.

The internal reference voltage (2,5 V) is provided on a separate pin or can be forced by an external reference (between 1,5 and 2,8 V) for reference thermal drift cancellation. A unique LEM ASIC designed for use with open-loop Hall-effect technology has been used to provide performance improvements. These include better offset and gain drifts and linearity, in addition to an extended operating temperature range (-40 to +85°C) compared to traditional discrete technology.

The transducers are CE marked, conform to the EN 50178 standard and are recognised for industrial applications such as home appliances, variable speed drives, UPS, SMPS, power inverters (solar, wind, etc,) and airconditioners.

Key features:

* Open-loop Hall-effect technology combined with ASIC.

* Access to the internal voltage reference.

* Small size and low cost.

* Four ranges for measurements from 5 to 20 A.

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