QM series; TDK’s ground-up revisit of modular PSU concept

September 29, 2016 // By Graham Prophet
TDK Lambda has added a new modular, configurable power supply series with the 1200W - 1500W modular QM range. It has been designed specifically to offer the lowest acoustic noise and to provide – for medical applications – comprehensive MoPP isolation.

TDK notes that these concerns came out strongly from user surveys; those showed the needs for very low levels of leakage, and for low noise – from all sources including moving air, fan noise and conducted hum and vibration. Not only is the noise undesirable but high volumes of air moved means issues with dust and contamination. TDK has measured the unit as having the lowest audible noise in its sector.


As with prior designs, the QM will consist of a chassis with front-end, into which the company will place selected units from a stock of output modules, to meet exact user requirements. The first chassis introduced accepts seven such modules; later introductions will host five and eight. QM is presented as the first 1200W to 1500W rated modular series to have full MoPPs (means of patient protection) isolation; with 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 using 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 90-264Vac, 47-440 Hz input the QM can deliver 1200W; and 1500W with a 150-264Vac 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, to a 1200W 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. Overall case dimensions are a compact 176 x 63.3 x 270mm (W x H x D), and the weight is between