Isolated current transducers integrate current conductor

2nd August 2016
Nat Bowers

Designed for AC and DC isolated current measurement up to 100KHz, the GHS series of miniature, IC transducers has been announced by LEM. These components offer full isolation despite their small size, integrating the primary conductor for nominal current measurements of 10, 12, 16 or 20A with a measurement span of 2.5 times the nominal current, they are also able to support high overload currents up to 200A peak for short durations (1ms).

The transducers are mounted directly onto a PCB as an SO8 SMD device, reducing manufacturing costs and providing appreciable space saving for space-constrained applications.

GHS models are really simple to use as integrate low resistance primary conductors (minimising power losses) within an ASIC to allow direct current measurement and consistent insulation performance, while still providing high creepage and clearance distances.

All the models provide a ratiometric analogue voltage output with different sensitivity levels from 40 to 80mV/A according to the model, with a typical response time of 5µs.

GHS transducers are not simple Open Loop Hall effect ASIC-based transducers; the series has been designed with unique primary integrated conductors for gradient measurement to provide an excellent immunity against the external fields found in power electronic applications.

These dedicated designs are combining field proven techniques as spinning, programmable internal temperature compensation (EEPROM) ensuring the high performance accuracy over the full range of temperature with a maximum 1.3% offset drift and 1.5% gain drift.

The GHS series operates from a single 5V supply and over a wide operating temperature range from -40 to +125°C, making it suited for use in harsh industrial applications.

The unique package and performance of the GHS series makes it suitable for applications such as white goods or air conditioning, which benefit from isolated current measurement, high performance and a cost-effective solution. GHS also enables enhanced motor control, reducing energy consumption where other methods, such as a shunt, have traditionally been used.

LEM’s GHS models are designed for use in a wide range of other applications including uninterruptible and switch-mode power supplies, home appliances, static converters for DC motor drives and robotics.

The GHS series conforms to latest industrial standards and is covered by LEM’s five-year warranty.

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