2007年4月11日  莱姆供稿

        Key points:

• Non-contact isolated current measurement of up to 70 A and higher
• Low price, IC packaging for SMD automatic assembly
• Cost-effective solution to measure current and increase energy efficiency in power electronics applications

• Proven to be flexible and most effective in multiple design-ins

        LEM introduces Minisens, a miniature, integrated circuit transducer for AC and DC isolated current measurement up to 100 KHz. This new component offers full isolation (no optocouplers required) and high sensitivity (from 20 mV to 200 mV per Amp of primary current) with no insertion losses. It is mounted directly onto a printed circuit board as an SMD device, reducing manufacturing cost.

        Minisens integrates, within one mixed signal ASIC, Hall-effect sensors with a magnetic concentrator to allow direct current measurement without the need for an additional magnetic core. The non-contact measurement enables an almost unlimited current level as it eliminates the need for current to flow through the device. The only limitating factor is the thermal capacities of the primary conductor. The current can be carried either by a track (or tracks) located on a PCB underneath the Minisens, or by a cable or bus bar under or above the IC. The unlimited design possibilities for the primary conductor allow current measurement up to 70 A or even higher.

        Many parameters of the ASIC can be configured by on-chip non-volatile memory: adjustment of the transducer’s gain, offset, polarity, temperature drift and gain algorithm (proportional to, or independent of VDD). Two outputs are available: one filtered, to limit the noise bandwidth; and one unfiltered, which has a response time of less than 3 microseconds.

        The degree of electrical isolation and output sensitivity can be increased by the PCB design – for example, a primary track on the opposite side of the IC gives best isolation; a track on the same side gives the highest sensitivity. Mounted as part of a standard PCB assembly process, manufacturing costs are minimized.

        The Minisens operates from a single 5V supply. To minimise power consumption an optional input pin can be used to switch the Minisens into standby mode. The transducer is manufactured with a CMOS process and assembled in a SO8-IC package.

        The combination of different IC configurations and flexible PCB designs results in very versatile and attractively priced current transducer solutions. This opens up opportunities for applications such as white goods or air conditioning to benefit from isolated current measurement, which previously was not feasible. Minisens will also enable enhanced motor control to produce energy savings where other methods such as a shunt have traditionally been used.

LEM
        LEM is a market leader in providing innovative and high quality solutions for measuring electrical parameters. Its core products – current and voltage transducers – are used in a broad range of applications in industrial, traction, energy, automation and automotive markets. LEM’s strategy is to exploit the intrinsic strengths of its core business, and develop opportunities in new markets with new applications. LEM is a mid-size, global company with approximately 700 employees worldwide. It has production plants in Geneva (Switzerland), Machida (Japan), Beijing (China), plus regional sales offices, and offers a seamless service worldwide. Further information is available at: www.lem.com

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For further information please contact:
Suzanne Hochheimer
Corporate Communications Manager
Tel.: +41 22 706 1257
E-Mail: SuH@lem.com
Website : www.lem.com

or

Laura West
Napier Partnership Limited
Tel: +44 (0) 1243 531123

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