Power sources meet supply and demand
01 June 2007
Energy efficiency and conservation are factors that determine the choice of power supply used in a design. Add to this the various style and format options and the choice for engineers is as wide as the engineering projects in which they are used
The company which has emerged following the merger of Condo DC Power and Ault, SL Power Electronics (www.slpower.com) has announced this PW152 external power supply that meets European and Asia energy efficiency initiatives.
Energy Star was introduced 15 years ago, for energy-efficient computers, initially. It is a branding that guarantees certain, energyefficient use for the product. Since 1992, the programme has grown beyond the US EPA (Environmental Protection Agency) endorsing computers and now Energy Star logos brand over one billion items, including domestic appliances and commercial, office equipment as well as Energy Star ratings being used for homes and buildings.
As a result, the programme reckons it has saved the use of greenhouse gas emissions equivalent to 14million vehicles in its first decade and reduced demands on power plants while saving consumers and building occupiers over $7billion in energy costs.
The PW152 is available in ITE and medical versions and is available in seven voltage options, of 50W in 5V, 9V, 12V, 15V, 18V, 24V and 48V models, for telecommunications, broadband, industrial and computer peripheral applications. All models have low output ripple and a three year warranty.
Another name change in the world of power is that of Powerstax (www.powerstaxplc.com), formerly known as Advanced Power Conversion.
The company designs and manufactures AC/DC and DC/DC supplies, including converters, configurable, modular and switch mode power supplies.
The latest addition is a series of 1U, compact power supplies for instrumentation, industrial control, telecomms and datacomms. The N series has efficiencies up to 92 per cent and are described as open-frame switching power supplies with output ranges of 125W, 160W, 250W and 260W.
Output voltages are 3.3V, 5V, 12V, 24V and 48V DC in dual or quad configurations. All models have universal AC input, active power factor correction and output OR’ing diodes for N+1 redundant operation. They can also operate safely without a load.
This uninterruptible power supply from XP Energy Systems (www.xpenergysystems.com) can be rack-mounted, free standing or stacked, according to the application. The digital display, showing input and output voltage, frequency, battery voltage and load, can be rotated through 90 degrees so that it is visible in whichever position is chosen. The Xi500L CE joins the company’s Xi series with models ranging from 1kVA to 6kVA.
All models in the Xi series have a proprietary universal battery design and are equipped with hot-swappable five-year-life batteries with a recharge cycle of under four hours to 90 per cent capacity. There is also a 10-year battery life option.
It is compact and measures 510mm deep, making the supply suitable for fitting into standard 600mm or 800mm cabinets. The unit, including the battery pack, weighs less than 30kg.
The uninterruptible power supply is a 110V I/O model that will accept dual mains input feeds and is protected with an auto switchover if one feed should fail. Remote emergency power-off means that the supply can be used confidently in hazardous environments.
A programmable point of load (PoL) power converter is announced by Power-One (www.power-one.com) which reduces the bulk of the power component in a design, with no need for multiple, host-system circuit pack design, reducing the inventory need for board-level, PoL.
The 25A YV12T25 PoL converter delivers 0.8V to 5.5V DC from a 10V to 14V DC input. Efficiencies are above 94 per cent and the converters also have thermal management for operation over an ambient temperature range of -40°C to 85°C.
Other features include no minimum load operation, the ability to start-up into prebiased loads and auto-reset output overcurrent protection. Interface features include remote on/off and remote sense.
The SIP package measures a compact 31.7mm x 50.8mm x 8.5mm, designed to minimise system airflow impedance for cooling upstream and downstream. The MTBF (mean time between failure) is 23million hours and the converters are RoHS-, UL94V-0 flammability- and UL60950- compliant.
C&D Technologies (www.cd4power.com) has extended its NMJ series of low-power DC/DC converters with the addition of eight single output models. The converters are pin and function-compatible with the company’s NMV series of DC/DC converters for upgrades with safety agency recognition.
Claimed to be the world’s smallest UL60950 safety standard-approved 1W converters, they are housed in fullyencapsulated UL 94V-0-rated, 7pin single SIPs with a 1.91mm2 footprint.
They also have a reinforced insulation that is production-tested at 5.2kV DC operation at full 1W load, without heatsinking between -40°C and 60°C.
The single and dual output, power sharing DC/DC converters use an internal surface mount construction and torodial magnetics for a density power rating of up to 0.42W/cm2. Inputs are available from 5V or 12V inputs and 5V, 9V and 15V outputs.
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