5 October 2016
Power Electronics / Power Management
TDK-Lambda announced the introduction of the QM series of AC-DC power supplies; the first 1200 W to 1500 W rated modular series to have full MoPP isolation, with the lowest acoustic noise available on the market at that power level. Having both medical and industrial safety certifications, the QM is suitable for a wide range of applications, including BF rated medical equipment, test and measurement, broadcast, communications and renewable energy applications.
Product definition is made extremely easy with an online configurator, giving an optimised module selection 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 8-digit code for easy order placement.
With a wide range 90 – 264 V a.c., 47 – 440 Hz input the QM can deliver 1200 W, and 1500 W with a 150 – 264 V a.c. input. Up to 16 outputs can be provided, with voltages ranging from 2,8 V to 52,8 V, with additional higher voltages planned. Module power ratings start with a low power 35 W, with single or dual outputs, all the way to a powerful 1200 W single output.
The units will operate in ambient temperatures of -20°C to +70°C, derating output power and output current by 2,5% per °C above 50°C. Overall case dimensions are a compact 176 x 63,3 x 270 mm (W x H x D), and the weight is between 2,6 and 3,1 kg, depending on the module configuration. The QM is covered by a seven-year warranty.
An optional standby/signal module is available with a choice of one or two standby voltages (5 V and 12 V at up to 2 A). It also contains unit inhibit or unit enable, plus an AC Good signal. All the output modules are fitted with module good, module inhibit signals and remote sense as standard (excluding the dual output DH module).
The QM operating efficiency is as high as 91%, reducing internal heat loss, allowing the use of low-speed cooling fans. This reduces audible noise for an enhanced patient/user experience to just 44,3 dBA at room temperature and 45,3 dBA at 50°C - measured in accordance with BS EN ISO 3744:2010. As less ingress of dirt and contaminants is drawn into the power supply than those with traditional high-speed fans, greater reliability can be realised.
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