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New modular power supply

New modular power supply

In designing its latest range of modular power supplies, TDK-Lambda undertook extensive customer surveys, finding out exactly what features users wanted. It claims that the new QM series has the lowest acoustic noise and full MoPP isolation.

TDK-Lambda says its QM series of AC-DC power supplies is the first 1200W to 1500W rated modular series to have full MoPPs isolation, and combines this 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, commun-ications and renewable energy.

With a wide range 90-264V AC, 47-440Hz input the QM can deliver 1200W, and 1500W with a 150-264V AC input. Up to 16 outputs can be provided, with voltages ranging from 2.8V to 52.8V, with additional higher voltages later. Module power ratings start with a low power 35W, with single or dual outputs, all the way to a powerful 1200W single output. Overall case dimensions are a compact 176 x 63.3 x 270mm and the weight is between 2.6 and 3.1kg.

Manufactured in the UK and with a seven year warranty, the units are certified to 60601-1, 60601-1, 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. 

The QM has a maximum earth leakage current of 300µA, while still complying with 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 designed and manufactured under the control of ISO9001 and ISO13485 (including risk management).

Product definition is made 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.

To learn more about the QM series modular power supplies, visit

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