PCB-mount current transducers
3 April 2013
Test & Measurement
LEM has introduced the LA 130-150 series of current transducers for use in motor drives, inverters, power supplies and general industrial applications. These printed-circuit board (PCB) mounted devices share a common, compact case outline, and are available to measure nominal full-scale currents of 130 and 150 A.
Thanks to the application of LEM’s established expertise in closed-loop Hall effect transducer technology, the new series offers high-accuracy, extremely linear measurements at a competitive price.
The transducers measure DC, AC and pulsed currents, providing an output in the form of a current signal proportional to the measured (primary) current. Two conversion ranges – a factor of 1000 or 2000 – are offered, with two mounting styles: the transducers can be supplied with an open aperture through which the current carrying the primary current is routed; or they can be supplied ready-fitted with a primary conductor that will connect direct to the host PCB.
Within the 33,5 (H) x 37 (W) x 16 (D) mm outline, the conductor aperture is a generous 13,5 x 10 mm. In form, footprint and function, the LA 130-150 series is backward-compatible with LEM’s prior-generation devices.
LA 130-150 transducers feature a wide maximum bandwidth of DC to 150 kHz (-1 dB point) and an accuracy of better than 0,5% at the primary nominal RMS current and at ambient temperature. Typical linearity error is ±0,1% at nominal current and the maximum offset temperature drift is ±0,46% of nominal current from -40°C to +85°C. The closed-loop Hall effect technology results in zero insertion losses and a fast response time of less than 500 ns.
The LA 130-150 series will find application at multiple points within variable-speed AC motor and servo motor drives; in static converters for DC motor drives; monitoring currents in battery-supply installations, and in uninterruptible power supplies (UPSs); in specialist power supplies, for example, welding PSUs; and in switch-mode power supplies in general, together with a wide range of other industrial, domestic appliance and HVAC applications.
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