LEM Holding SA has added three new members to its HO series of PCB-through-hole mounting current transducers, which provide an aperture of 8 x 8 mm to carry the primary conductor under measurement, extending the options for this form-factor. The new models, for 6-, 10- or 25-A nominal measurements of dc, ac, and pulsed signals benefit from the revised LEM Open-loop Hall-effect ASIC introduced several months ago with the launch of the HO 8, 15 and 25-NP & -NSM models.
Using the latest LEM-developed ASIC, combined with Open-loop Hall-effect technology, the new devices meet the demand for high performance and quality at a lower cost. The HO 6, 10 and 25-P models’ offset and gain drift are twice as accurate (over the temperature range -25 to +85 degrees C) as the previous generation. A high level of insulation between primary and measurement circuits, due to the high clearance and creepage distances of more than 8mm and a CTI (comparative tracking index) of 600, allows a test isolation voltage of 4.3 kVrms/50Hz/1min. In addition, the HO xx-P series delivers better performance in other areas such as response time, power supply and noise, allowing the development of more technically advanced power electronics applications.
LEM’s HO xx-P models are suited for a range of applications where mounting flexibility offered by the aperture and a small size is needed, such as in solar combiner boxes and solar-power inverters, as well as small smart meters, variable speed drives, uninterruptible and switch-mode power supplies, air conditioning, home appliances, static converters for dc motor drives, and robotics.
The transducers require a PCB mounting area of only 2.88cm2 and weigh only 10g. They can measure up to 2.5 times the primary nominal current but also incorporate an additional pin providing an over-current detection set at 2.63 x the nominal current IPN (peak value). The products also provide fault reporting in the case of memory contents being corrupted. LEM’s HO xx-P transducers operate from a single supply voltage at 3.3 or 5V.
The new range delivers its output as a scaled analog voltage; in most systems this will be converted to a digital value by an analogue/digital converter (ADC) which requires a reference voltage. The HO xx-P series can also be configured to make measurements relative to an external reference.
source: http://www.powerpulse.net/story.php?storyID=29847
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