Configurable supplies have medical certification

23rd September 2016
Caroline Hayes

Configurable power supplies from TDK-Lambda are the first 1,200 to 1,500W-rated versions to have full Means of Patient Protection (MoPP) isolation. The QM series of AC/DC power supplies are also claimed to have the lowest acoustic noise at that power level, for use in medical or healthcare environments.

The supplies have both medical and industrial safety certifications, making them suitable for a range of applications, including body floating (BF)-rated medical equipment, test and measurement, broadcast, communications and renewable energy applications.

They offer 90 to 264V AC, 47 to 440Hz input, to deliver 1,200, and 1,500W with a 150 to 264V AC input. Up to 16 outputs can be provided, with voltages ranging from 2.8 to 52.8V. (Additional, higher voltages will be announced later.) Module power ratings start at 35W, with single or dual outputs, and extend to a 1,200W single output. The units will operate in ambient temperatures of -20 to +70°C, derating output power and output current by 2.5% per °C above 50°C.

Case dimensions are 176 x 63.3 x 270mm and weight is between 2.6 and 3.1kg, depending on the module configuration.

An optional standby/signal module is available with a choice of one or two standby voltages (5.0 and 12V at up to 2A).

Operating efficiency is up to 91%, reducing internal heat loss and allowing the use of low speed cooling fans. This reduces audible noise to just 44.3 dBA at room temperature and 45.3 dBA at 50°C (measured in accordance with BS EN ISO 3744:2010), making them suitable for patient environments. The company also claims that with the low speed fan, there is less ingress of dirt and contaminants drawn into the power supply than with high-speed fans.

The units are certified to IEC/EN/UL/CSA 60601-1, ANSI/AAMI ES 60601-1, IEC/EN/UL/CSA 60950-1 and designed to meet IEC/EN61010-1 with CE marking for the Low Voltage and RoHS2 Directives. With an input to output isolation of 4,000V AC (2 x MoPPs), 1,500V AC input to ground (1 x MoPP) and 1,500V AC (1 x MoPP) output to ground, the series can be used in BF-rated medical equipment.

Maximum earth leakage current is 300µA, while still complying with the EN61000-6-3:2007 and EN60601-1-2:2015 (curve B conducted and radiated) emission standards. The units also meet the EN60601-1-2 and EN61000-6-2 immunity standards and are covered by a seven-year warranty.

An online configurator can help engineers choose an optimised module, with a choice of signals, leakage current and standby voltages. Once the desired output voltages and currents have been entered, the configurator will automatically produce a unique eight-digit code used to place an order.

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