Artesyn releases revised PMBus spec
News & Analysis 3/31/2005 Post a comment
Artesyn Technologies Inc. has announced the public release of Revision 1.0 of the PMBus open-standard digital power management protocol and a special interest to further develop and promote the PMBus power operating system.
Ericsson takes the lead in removing lead
Special Report 3/31/2005 Post a comment
OEMs are getting serious about lead-free manufacturing in the face of consumer pressure and forthcoming legislation. Ericsson Power Modules is staying well ahead of the game with lead-free products that are designed for lead-free assembly lines.
Inverter powers rugged railroad requirements
Product News 3/31/2005 Post a comment
Absopulse Electronics' RSI 500 series of low-profile inverters deliver 500 VA continuous for on-board railway applications. It's also suitable for driving AC appliances in industrial, utility, mining, marine and other harsh environments.
Design How-To 3/30/2005 Post a comment
FPGAs are designed using advanced technologies to achieve smaller process geometries, the voltages needed to run these devices are getting lower. This creates the need for a carefully considered power management solution for FPGA based applications.
Arotech wins $24 million Army contract for zinc-air batteries
News & Analysis 3/29/2005 Post a comment
Arotech Corp. announced Tuesday (March 29) that its Electric Fuel Battery subsidiary has received a contract from the U.S. Army's Communications and Electronic Command (CECOM) to supply up to $24 million in zinc-air batteries and adaptors to the Dept. of Defense over the next three years.
Backlighting inverter serves 15-, 17-inch LCDs
Product News 3/24/2005 Post a comment
Taiyo Yuden's KLS-170A, the latest addition to the company's line of compact single-board (DC/AC) inverters for backlighting liquid crystal displays (LCDs), drives four cold-cathode fluorescent lamps (CCFL) for high-visibility 15- and 17-inch displays from Sharp and Optrex.
High-voltage MOSFETs smash RDS record
Product News 3/23/2005 Post a comment
Infineon says the first two members of its CoolMOS CS Server power transistor series, designed specifically for power supplies used in computer servers and other high-power-density applications such as telecom equipment and flat panel displays, set new records for the lowest on-resistance (RDS) and highest switching speed for devices in this application. Touting a technical breakthrough that allows the MOSFETs to overcome the so-called silicon limit for performance (a fivefold increase in on-res
How you can manage multiple voltages in portables
Design How-To 3/23/2005 Post a comment
There is a need for digitally programmable power management control functions to meet the increasingly stringent supply rail requirements. Here's a new "platform solution" that can change to meet any type of system power supply requirement that eases the designer's job.
Bricks expand their power base
Product News 3/22/2005 Post a comment
DC/DC brick recap - There's surprising innovation in the latest burst of brick-style (i.e., isolated) DC/DC converters. The last generation's quarter-bricks approached the capabilities of old-line half-bricks, and half-bricks did the job of three-quarter bricks. This generation's eighth-bricks eye the basic capability of half-bricks, and on up the line. More converters are suited to power-over-Ethernet (PoE) and the high-voltage requirements of RF amplifiers and industrial applications. Digitall
Quarter-brick bus touts digital edge
Product News 3/20/2005 Post a comment
Touting the use of an innovative, "Level 2" microcontroller-augmented design to cut down modular parts count from more than 60 to 12, C&D Technologies' QBC12/22-L48, a quarter-brick bus converter in Datel's single-output QBC family, is optimized for a total on-board solution when used with the company's (non-isolated) point-of-load (POL) converters in the HEN, LEN, LQN, LSM, and LSN series. Working from a nominal 48-volt (~40 to 57 V) input, the single-output model delivers up to 264 watts at a
10-amp POLs answer telecom call
Product News 3/18/2005 Post a comment
Astrodyne's HNA series of (nonisolated) point-of-load (POL) converters, in 8 models, delivers up to 10 amps at 0.9 to 3.3 volts from a 3- to 5.5-volt input for board level applications such as data processing, communications, and local area networks/wide area networks (LANs/WANs).
Accurate and Lossless Current-Sensing Techniques for Power Applications -- A Practical Myth?
Design How-To 3/16/2005 Post a comment
The power supply is the backbone of any electronic device, and its performance is especially critical in the growing mobile consumer market. For the safety, performance, and feedback control of these switching supplies, it is often necessary for the circuit to better understand its loading environment, especially load current. Protecting the supply circuits, for instance, against overloading and short-circuit conditions requires the system to self-monitor its current delivery. Here's how it can
UPS duo keeps SOHOs in business
Product News 3/15/2005 Post a comment
Eaton Corporation's Powerware 3105 and 5110 are two new off-line uninterruptible power systems (UPSes) designed to protect a wide range of small-office, home-office (SOHO) equipment against power line surges, sags, and outages.
How to Drive RGB LEDs in Mobile Phones
Design How-To 3/15/2005 Post a comment
Developments in recent years have made RGB LEDs smaller, brighter, and cheaper, making them very popular for use in mobile phones. Part of the problem when driving RGB LEDs is that the Red, Green, and Blue LEDs have different forward voltage characteristics, and in order to avoid shifts in color, the forward current must be constant. Here's how to solve the problem.
Half-brick delivers tight, high-efficiency bus power
Product News 3/15/2005 Post a comment
Power-One's HKS48T30120 half-brick, providing up to 384 watts at 32 amps, delivers a tightly-regulated as well as high-efficiency output for powering the intermediate bus as well as computer, networking and wireless communications equipment.
Overcoming the Duty Cycle Limits of the Two-Switch Forward
Design How-To 3/14/2005 Post a comment
The two-switch forward design has some advantages in power designs such as transformer energy recovery. However, it can cause supply shutdown if its maximum 50% duty cycle is surpassed. The author points out how you can enhance the duty cycle without having to extend the voltage rating and all additional circuitry it requires.
Nanotubes ermöglichen hochdichte Superkondensatoren
Product News 3/12/2005 Post a comment
Wissenschaftler der University of California-Davis haben einen Superkondensator mit einer Leistungsdichte von 30 Kilowatt pro Kilogramm hergestellt. Solche Konensatoren könnten möglicherweise in manchen Anwendungen Akkumulatoren ersetzen.
POL delivers 75 amps for DDR2 memory
Product News 3/10/2005 Post a comment
C&D Technologies' VCN75-018V programmable point-of-load (POL) converter for computing applications, from the company's Power Electronics division, can deliver up to 75 amps at 1.7 to 1.95 volts from a 12-volt input for high-speed double-data-rate (DDR2) memory as well as equipment requiring high current from a fixed-voltage output source.
CeBIT: Brennstoffzelle für den Laptop
News & Analysis 3/10/2005 Post a comment
Den Prototyp einer Brennstoffzelle für Laptops hat der taiwanesische Hersteller Antig Technology auf der CeBIT vorgestellt. Die Energiequelle lässt sich in den CD-Laufwerksschacht einstecken und soll im Vergleich zu herkömmlichen Akkus mindestens die doppelte Laufzeit ermöglichen.
AC/DC supply is one of the toughest on the block
Product News 3/9/2005 Post a comment
Wall Industries new PSA Series of encapsulated block-style switching power supplies is designed for rugged applications. The supplies, suited to PC board-mounting, deliver from 5 to 30 watts from a universal AC input, in single, dual and triple outputs of 3.3, 5, 12, 15 and 24 VDC. Operating efficiency is as high as 84 percent.
PoE midspan delivers condensed 48-port solution
Product News 3/9/2005 Post a comment
PowerDsine says its PD-6548 is the industry's first 48-port power-over-Ethernet (PoE) midspan which, in a 19-inch rack-mountable 1U enclosure, also delivers twice the port-density provided by two 24-port PoE midspans for powering Voice over IP (VoIP) systems.
UPS extends on-line backup down to 500 VA
Product News 3/9/2005 Post a comment
Emerson Network Power's Liebert GXT2-500 extends the GXT family of true on-line uninterruptible power supplies (UPSes) down to 500 VA to meet the increasing demand for low-power yet highly critical applications such as gateway routers, firewall and VPN concentrators in IP telephony applications.
Eighth-bricks reach 300 watts
Product News 3/8/2005 Post a comment
Artesyn says the three new intermediate bus converters (IBCs) in its Typhoon family are the first eighth-bricks in the industry capable of delivering up to 300 watts. These open-frame, single-board DC/DCs, one which delivers an unregulated output and two that provide semi-regulation, are designed to generate a 12-volt intermediate bus voltage for powering multiple downstream (non-isolated) POL converters in distributed power systems.
"Save my s, ... please...!!"
Power DesignLine Blog 3/7/2005 Post a comment
Are we ready for digital power supply control? Don Alfano of Silicon Labs brings the whole idea into perspective with his insightful thoughts and great analogies. What do you think?
Chip regelt Ladung von Lithium-Akkus
News & Analysis 3/7/2005 Post a comment
Für Einsatzbereiche mit niedriger Stromaufnahme optimiert ist ein neuer Lade-IC für Lithium-Ionen- und Lithium-Polymer-Akkus von Intersil. Der Baustein regelt beim Ladevorgang Spannung und Strom.
Neue Wege bei der Blindstromkompensation
News & Analysis 3/3/2005 Post a comment
Mit der Geräteserie PhaseMod beschreitet Epcos bei der Blindleistungskompensation (BLK) neue Wege. Dank der Integration von Kondensatoren, Sammelschienen, Schützen, NH-Sicherungen, Entladewiderständen, Temperaturüberwachung sowie der Regeleinheit in einem anschlussfertigen Modul, ergibt sich eine Gewichts- und Platzersparnis von bis zu 80 Prozent.
Powering Laptops with Hydrogen
Design How-To 3/3/2005 Post a comment
Millennium Cell a developer of hydrogen energy systems, demonstrated a next generation product prototype to power a notebook PC at the Intel Developer Forum.
Power puts the squeeze on POLs
Product News 3/2/2005 Post a comment
POL recap—Distributed power delivery systems aren't getting any simpler, with ever higher demands on power density placing particularly great strain on (nonisolated) DC/DC point-of-load (POL) converters. A snapshot of the latest POL products show a universal design approach of sorts that's suitable for securing more power or current from a smaller package for most of the POL's far ranging applications. Whether chip or modular device, we're seeing converters that operate at higher switching
Miniature disk drives in handhelds demand creative power management
Teardown 3/2/2005 Post a comment
"There's a kind of genius at work here, in the power management device's ability to deliver just the voltage-and-current you need, but otherwise get out of your way." Here's the full text and graphics from Steve Ohr's "Design Currents" report on managing power in the Apple iPod and other disk-based media players.
A New Solution for Hot Swap Challenges
Design How-To 3/1/2005 Post a comment
Inherent failure mechanisms in hot swap systems include the safe operating area of the power FET and the ability to withstand an inductive spike when the device is unplugged while current is flowing. Find out how to solve both these problems without the need for tranzorbs, overrating of power devices, or short pins.