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AC/DC power supplies for surgical life support applications

XP Power has announced the EMH250 and EMH350 series of single output 250 and 350W AC/DC power supplies. Meeting the IT equipment safety specifications of UL/TUV/EN 60950-1 and the medical safety standards of UL/TUV/EN 60601-1, the supplies are suitable for information technology, industrial, medical equipment and surgical life support applications. Both the supplies have an input range of 80 to 275V AC and are available in four output models covering the voltages of 12, 18, 24 or 48V DC. A trim function allows adjustment of the output voltage to within ±10% of stated nominal. A 12V DC/0.6A fan supply is also provided across the range. The 350W AC/DC power supply also includes a 5V DC/2A standby supply. The supplies do not derate until +50°C operating temperature, says the company. Measuring 76.2x127x36.3mm, these supplies require 12CFM of forced airflow in order to deliver the full output power, claims the company. An optional top mounted fan is claimed to be available across the range, and the 350W power supply has a variable speed fan that is dependent on its operating temperature. The 350W power supply is available with an optional ORing diode circuit that allows for current sharing in N+1 redundancy configurations. The supplies provide either analogue or digital control options. The analogue signals provide power fail, inhibit and current share. Digital signals and controls are accessible using PMBus compatible commands.