Surface mounted isolated current transducers with integrated current conductor
September 2017
Sensors & Transducers
LEM has expanded its miniature transducer range for AC and DC isolated current measurement up to 300 kHz with the introduction of the Go series. These new components offer full isolation by integrating the primary conductor for nominal current measurements of 4, 6, 8, 10, 12, 16, 20 or 30 A, with a measurement span of 2,5 times the nominal current. Products in the series are able to support high overload currents up to 200 A peak for short durations (1 ms).
The transducers are simple to use as they integrate low resistance primary conductors (minimising power losses) within a proprietary ASIC to allow direct current measurement and consistent insulation performance, while still providing high creepage and clearance distances.
Standard models provide an analog voltage output with different sensitivity levels according to the models to achieve an output voltage of 800 mV @ IPN for 5 V devices, and 500 mV @ IPN for 3,3 V versions. Ratiometric output is also an option through dedicated models.
Go 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.
Some applications, particularly for motor drives, have the same need for speed, but are less demanding of the current range and isolation levels, while placing strong pressure on price and dimensions. In these applications, the series can easily compete against other traditional low cost current measurement solutions such as shunts, commonly used for cost reasons, but in additional to the usual benefits of a shunt, Go brings natural insulation.
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