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AC/DC power supply gains ITE, medical safety approvals

Posted: 09 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:AC/DC? power supply? medical safety ITE?

Emerson Network Power has launched a high efficiency 100-150W AC/DC supply that features both information technology equipment (ITE) and non-patient contact and non-patient critical medical safety approvals. The LPS103-M power supply is a compact open-frame design; measuring just 5.1cm x 10.2cm, with a height of only 3.3cm, it has a typical full load efficiency of 88 percent and a power density of 0.9W per cubic centimeter. According to Emerson, the supply is primarily intended for use in ITE and light industrial systems, as well as for equipment intended for non-patient contact and non-patient critical use in low power medical, dental and laboratory applications.

The LPS103-M features a universal 85-264Vac input enabling it to be used anywhere in the world and is capable of operating from a 120-300Vdc input. The power supply produces a tightly regulated main 12Vdc output, together with an isolated 12Vdc fan output; the latter is rated at 1A, while the main output can deliver up to 8.3A continuously with convection cooling, or up to 12.5A continuously with 30 CFM forced air cooling. The main output can be adjusted over the range 10.8 to 13.2Vdc, and remote sense facilities are provided to compensate for a drop of up to 0.5V between the output terminals and the load.

Active power factor correction is employed to minimise input harmonic current distortion and ensure compliance with the international EN61000-3-2 standard the LPS103-M has a power factor of 0.99 typical. The power supply has a maximum safety-ground leakage current of 275?A, and the main output has a hold-up time of 16ms minimum when the supply is fed with a 120Vac input and is delivering 150W of output power.

LPS103-M power supplies are comprehensively protected against overvoltage, overtemperature and short-circuit conditions, and feature a 'power fail' signal for remote monitoring purposes, which will change state at least 6ms before the main output loses regulation. The power supplies have a full load ambient operating temperature range of 0 to +50C without de-rating and can cold-start from temperatures as low as -20C. Between 50 and 70C, the output should be derated by 2.5 percent per degree.

Emerson's LPS103-M AC/DC power supplies comply with the EN55022-B and FCC part 15 Level B EMC standards for conducted noise and meet all applicable immunity standards, including EN61000-4-2, -3, -4, -5, -6, -8 and -11 levels 3. The power supplies carry a wide set of safety approvals, including UL/TUV/CSA 60950-1 and non-patient contact and non-patient critical 60601-1.

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