| Dear Sir/Madam
Nowadays
a power supply has to be a „green“, very cost effective, and
highly power efficient device which causes various design challenges.
The Design Ideas and the book of the month in this power newsletter
can help you to address these challenges – if you have to design
power supplies. Enjoy!
Wolfgang
Patelay
Technical Editor, EPN
High-Density
Switcher Supplies (V-Infinity)
The
VMS-160 series high-density, medically approved open-frame switching
power supplies outputs 160W with 400LFM forced air cooling or
100W under convection-cooled conditions. This translates to
a power density of 18 W/in³ in a 1U, industry-standard, 2x4"
footprint. The power supplies are approved to both medical EN60601-1
and ITE EN60950-1 safety standards.
Click
here
AC/DC
Switcher with Active PFC (Vicor)
The
PFC FlatPAC is a flexible, power-dense power supply using the
VI-HAM and Maxi DC/DC converters to deliver up to 575W of power.
This single-output power supply is available with standard output
voltages from 2 to 54VDC. It operates from an input voltage
of 85 to 264 VAC, includes active PFC (0.99 power factor), and
meets EN61000-3-2 harmonic-current limits.
Click
here
AC/DC
Power Supplies (Micro Power Direct)
The
MPA150x series of power-factor-corrected AC/DC power supplies
provides up to 150W of output power in a very compact 1U height
U-Chassis. Six standard models operate from auto-ranging inputs
of 90 to 132VAC or 180 to 264VAC, providing tightly regulated
single outputs. Outputs are factory-set to 3.3. 5, 12, 18, 24,
or 48VDC (all are user-adjustable).
Click
here
1000W
Single-Output Power Supply (YEG Powerline)
The
new 1000W units are initially available with 5, 12 or 24V output
and check power supply specification requirements such as universal
AC input continuous 85 to 265V; 4KVac input to output isolation,
low leakage current (<300µA) and still have curve B built
in EMI filtering as standard; flexible output voltages to cover
non standard system voltages.
Click
here
A
Look at Battery Lifetime
There
are several different topologies that can be used for step-up/step-down
conversion: SEPIC (single-ended primary inductance converter),
boost converter with built-in LDO, and boost converter with
down-mode conversion. John Constantopoulos from Texas Instruments,
the author of this article analysed all of them under the same
conditions and describes their impact on battery lifetime.
Click
here
Choosing
between COTS Modules and Traditional Hybrids
When
considering COTS (commercial off-the-shelf) DC/DC converters,
it is important to compare the traditional hybrid approach with
the use of COTS modules to establish whether the benefits of
COTS can turn into disadvantages and whether the claimed advantages
of hybrid circuits are real. Detailed information gives the
article by Steve Elliot from XP.
Click
here
Isolated
supply powers DVM module
Low-cost
DVM (digital-voltmeter) modules are economical and can significantly
reduce design time for instrumentation. Yet, these modules also
involve a significant number of design challenges. The power-supply
design in the
Design Idea by Richard Dunipace from Fairchild Semiconductor
is a blocking oscillator that operates as a flyback converter
with fixed on-time and variable off-time and avoids these design
challenges.
Click
here
IC
performs delayed system reset upon power-up
A
manual reset is a good feature for most applications; however,
it requires human intervention to create the reset. In some
applications, a manual reset could be a hassle because you must
perform it each time the system powers up. The circuit in the
Design Idea by Goh Ban Hok from Infineon Technologies proves
useful during power-up when there is no need to press the reset
button once the device powers up, because reset occurs automatically
with the predetermined hold time before you apply the reset-low
signal.
Click
here
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4|
Book of the Month |
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Power
Sources and Supplies, by Marty Brown
The
author selected material for its timelessness, its relevance
to current power supply design needs, and its real-world approach
to design issues. Special attention is given to switching power
supplies and their design issues, including component selection,
minimization of EMI, toroid selection, and breadboarding of
designs. Emphasis is also placed on design strategies for power
supplies, including case histories and design examples.
Click
here
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5|Competition
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Three
Brushless DC Motion MCU Kits to Win
This
month, Luminary Micro is giving away three of its newly announced
Stellaris BLDC (brushless DC) motor-control reference design
kits (RDK-BLDC) with built-in Ethernet and CAN. These kits use
the company's ARM Cortex-M3-based microcontrollers. The reference
design kit, worth 150 euros, is a four-quadrant controller for
three-phase brushless DC motors rated at up to 36V, 500W, and
60,000rpm.
Click
here
Copyright 2008, Reed
Business Information.
EPN and EDN Europe are members of the Reed Electronics Group
Reed Business France - 2 rue Maurice Hartmann, 92133 Issy-les-Moulineaux,
France
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