Energy-efficient design does not just apply to the front-end modules that have embraced the 80 PLUS initiative. Energy-efficient design ripples through the entire system. Most computer and telecom servers, for example, employ distributed power architecture in which one or more front-end PSUs supply electricity to a tree of intermediate and point-of-load (POL) DC/DC converters. The distribution voltage is higher than that required by most digital ICs as this minimizes cabling and PCB track losses.
A commonly used distribution voltage is 12 V and conversion from this level down to the 1 V or 2 V needed at the POL is seeing high levels of innovation from PSU manufacturers not just in power efficiency but density. An example is the EN5339QI made by Enpirion. Essentially a power system-on-a-chip (PowerSoC), the EN5339QI, uses high-speed MOSFET technology to support very ultra-high switching frequencies. This design results in a 20 percent footprint reduction and 40 percent lower profile compared to previous Enpirion 3A design. The PowerSoC integrates the controller, power MOSFETs, compensation network and inductor in a 4 mm x 6 mm package and provides an efficiency rating up to 95 percent.
Another supplier focusing on efficiency is Aimtec a relatively new entrant in both the AC/DC and DC/DC segments. The company offers AC/DC PSUs in chassis mount and units that can be soldered onto the PCB up to 150W.
Aimtec’s AC/DC power conversion range include board mounted and open-frame units
Aimtec’s AC/DC and DC/DC power converters provide outputs from 0.24 to 40 Watts, available in a wide selection of package types, including ultra miniature and low profile models
January 2016 Cartoon Caption ContestBob's punishment for missing his deadline was to be tied to his chair tantalizingly close to a disconnected cable, with one hand superglued to his desk and another to his chin, while the pages from his wall calendar were slowly torn away.122 comments