25 February 2004Power Electronics / Power Management
Surveillance
LEM's HTS 10-P is the smallest current transducer in its range occupying only 17 x 19 x 10,5 mm (L x W x H) on a printed circuit board. Using a unipolar power supply of 0 to +5 V, it allows bipolar current measurement of 10 A r.m.s. nominal, supplying a ratiometric voltage output. The initial offset at no primary current (Vdd/2), as well as the gain (Vdd x 20 mV/A) at +25°C are then directly dependent on the supply voltage used. With a measuring range of up to ±15 A pk, it is particularly suitable for detecting overloads.
The size, the wide operating temperature range (-40 to +85°C) and the unipolar power supply targets have been achieved by using an ASIC. The HTS 10-P is supplied with a tolerance of ±12% for the initial offset and ±30% for the gain at +25°C. When the transducer is used with a microcontroller, these tolerances can be improved. Otherwise, the HTS 10-P/SP1 version, with tolerances upgraded to ±3% and ±20%, respectively for the initial offset and for the gain at +25°C, is also available. This version also offers better thermal offset and gain drift.
The performance and low cost of the HTS 10-P series make it particularly suitable for industrial applications (compliance to the EN 50178 standard and marked CE) such as garage door openers; electric doors, gates, shutters and awnings; electric power seats. It is also suitable for low-power, low-cost drives, where the transducer can provide detection, monitoring and safety.
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