Power

Modular AC/DC power supplies meet medical and broadcast certifications

3rd June 2017
Caroline Hayes

Modular AC/DC power supplies in the QM series by TDK-Lambda, are low acoustic noise 700 to 1200W supplies carry both medical and industrial safety certifications, and can be used in applications such as BF-rated medical equipment, test and measurement, broadcast, communications and renewable energy.

The 700 to 1200W models in the QM5 series share the same form factor as the QM7 series, which was introduced last year. All models in the latest series carry both medical and industrial safety certifications, and can be used in applications such as body floating (BF) -rated medical equipment, test and measurement, broadcast, communications and renewable energy.

The supplies are packaged in enclosures measuring 127 x 63.3 x 270mm and can deliver 1200W at 180 to 264V AC and 700W with a wide range input of 90 to 264V AC.

Up to 12 outputs can be configured using single and dual output modules with voltages from 2.8 to 61.6V. There is an optional standby/signal module with a choice of one or two standby voltages (5.0V, up to 2.0A and 12V at 1.0A), unit inhibit or unit enable, an ‘AC good’ signal and a PMBus interface.

Operating temperature is -20 to +70°C, derating the output power and output current by 2.5% per °C above 50°C. Operating efficiency is up to 91%. As internal power loss is reduced, a low speed low audible noise fan can be used to improve the patient or user experience and also to increase reliability as less dirt and contaminants are drawn into the power supply.

The power supplies 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/EN 61010-1. They also have CE marking for the low voltage and RoHS2 directives. Input to output isolation is 4,000V AC (2 x means of patient protection or MOPPs), 1,500V AC input to ground (1 x MOPP) and 1,500V AC (1 x MOPP) output to ground. 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, claims the company. The modules in the series also meet the EN60601-1-2 and EN61000-6-2 immunity standards.

To select the right product, the company offers an on-line configurator, with a choice of output, signals, leakage currents and standby voltages. Once the desired selection has been made, the configurator automatically produces a seven-digit code that can be used when placing the order.

The QM series is covered by a seven-year warranty.

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