Medical power supplies range extended with new voltage options
TDK-Lambda has extended its successful range of EFE300M digitally controlled medical power supplies with the addition of three new models with nominal outputs of 28V/10.71A, 40V/7.5A or 48V/6.25A. Digital control combined with a 4kV AC reinforced input to output isolation and other specifications such as an output-to-ground isolation of 1500V AC, enables the EFE300M to meet the rigorous international safety standards of IEC 60601-1 for medical equipment, making them suitable for use in B (general) and BF (direct patient contact) type medical applications.
As with previous models in the EFE300M, these three new units deliver 300W continuous power (400W peak for 10 seconds) and can easily accommodate non-standard system voltages by precise factory programming. The patented Multi Resonant Topology helps boost efficiency to typically 90%, and the 8-bit microcontroller provides full digital control of the output and handles all housekeeping routines. Typical power densities of up to 16.6W/in3 are achieved under peak load conditions and 12.5W/in3 under continuous loading.
An additional 12V/1A fan supply is also included and all models operate from 90-264V AC input with dual fusing as standard. Earth leakage current is better than 300µA, fully complying with medical safety requirements. Active power factor correction ensures EN61000-3-2 compliance. Other EMC improving design features, such as the use of SiC diodes, ensure curve B EMC performance with a significant margin. The use of digital control allows the EFE300M to be smaller, cooler and more feature rich, consistent with the trend towards environmentally friendly products. Standard features such as redundant operation capability and a high current standby output make the supplies equally suitable for high integrity applications.
Further features include remote on/off and power good signals; the EFE300M also comes with a 5V/2A isolated standby supply, which is not affected by the remote on/off. The inclusion of an OR'ing FET allows redundant connection of the units with no additional diode required. Output regulation is better than 4% and, since the microcontroller is used to digitally predict the output voltage, the line and load regulation can be changed or fine tuned precisely - this is particularly useful when droop paralleling.
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