Digitally Controlled Power Supplies Meet Medical Specs
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Designed specifically with medical applications in mind, a digitally controlled 300 watt DC power supply meets the rigorous international safety standards of IEC 60601-1 for medical equipment, making it suitable for use in B and BF type medical applications. The EFE300M from TDK-Lambda boasts a 4 kVAC reinforced input to output isolation and other specifications such as an output-to-ground isolation of 1500 VAC. Regulated DC outputs of 12V or 24 VDC are standard for the EFE300M and other voltages can be provided.
With a 3 x 6 inch footprint and less than a 1U profile (1.6" max), the EFE300M can be easily incorporated into designs where space is limited so end equipment can be smaller and cooler. Other features such as a redundant operation capability and a high current standby output make the EFE300M equally suitable for high-integrity applications including broadcast, instrumentation, routers, servers and security networks, as well as ATE, factory automation and mechatronics. The EFE300M series includes an integrated magnetics transformer (transformer and inductor windings on the same core) to boost efficiency to typically 90% and employs an 8-bit microcontroller for full digital control of the output and to handle housekeeping routines.
TDK-Lambda’s control of the EFE300M allows the power supply’s performance, such as current limit and start-up characteristics, to be optimized digitally. This feature eliminates the hardware changes usually required in analog designs. A low-cost primary side control topology is used, supervised by the microcontroller. Additional features include remote on/off and power-good signals; it also comes with a 5V/2A isolated standby supply, which is not affected by the remote on/off.
The EFE300M delivers 300W continuous power (400W peak for 10 seconds) with nominal outputs of 12V/25A or 24V/12.5A. However, non-standard output voltages can be accommodated easily by precise factory programming. An additional 12V/1A fan supply is also included and all models operate from 90 to 264VAC input with dual fusing as standard. Earth leakage current is less than 300µA at up to 264VAC, fully complying with medical safety requirements. Active power factor correction ensures EN61000-3-2 compliance. Other EMC improving design features include the use of SiC (silicon carbide) diodes that ensure Curve B EMC performance with a significant margin.
TDK-Lambda’s EFE300M is approved to IEC/EN/UL/CSA 60950-1 for general-purpose applications, IEC/EN 61010-1 for laboratory and process control applications and, of course, IEC 60601-1 for medical equipment. Pricing starts at $183 each in 500 piece quantities.
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