A Tracking Negative Voltage Made Easy
Feb 1, 2006
A simple circuit added to any synchronous-buck
converter generates a tracking negative output
that achieves good voltage regulation, low cost,
small area and high effi ciency....
New Products: February 2006
Feb 1, 2006
This issue of Power Electronics Technology features battery-charger ICs, rectifiers, thick film resistors and inductors...
Coupled Inductors Improve Multiphase Buck Efficiency
Jan 1, 2006
There has been considerable discussion within the power supply industry about the operation and benefits of using coupled inductors as the magnetic components...
Scaling Design Methods To Improve Transformers
Oct 1, 2005
The size, performance and cost of a power electronic system are closely linked to the like parameters of the magnetic components. Since custom power transformers are widely used, transformer design is a frequent design process that has a significant impact on system performance. Yet most high-frequency transformers use less than 25% of the available core window for efficient current conduction....
Designing Single-Switch Forward Converters
Oct 1, 2005
Often used in dc-dc converter modules for power levels below 100 W, single-transistor, resonant reset forward converters are also useful for dc-dc converters with adjustable output voltages....
Nondissipative Clamping Benefits DC-DC Converters
Sep 1, 2005
Even if small, a transformer's leakage inductance reduces the efficiency of some isolated dc-dc converter topologies. However, the technique of lossless voltage clamping helps restore most of the lost energy....
Then and Now
Sep 1, 2005
As we continue our Then and Now series, we once again will look at three products selected from a 1975 edition of Solid-State Power Conversion, the predecessor...
Top 10 Tidbits of Battery Wisdom
Jul 28, 2005
By avoiding common design errors, designers can extend the runtime of their battery-powered portable products....
Back to the Future with Magnetic Modulation
Jun 1, 2005
More than two decades ago, I was responsible for developing the two ac-dc power supplies that would ultimately be used in the AN/ALQ-184 Radar Jammer...
SPICE Analog Behavioral Modeling of Variable Passives
May 1, 2005
In this third and final installment, the technique for modeling variable passives in SPICE is applied to inductors. When an inductor is energized, it...
Inductor Current-Sensing Boosts Regulator Efficiency
Apr 1, 2005
The lossless-inductor approach to voltageregulator current-sensing requires power
supply designers to understand how magnetic tolerances and variations affect ripple current, load sharing, efficiency and other aspects of the design....
Estimate Inductor Losses Easily in Power Supply Designs
Apr 1, 2005
Inductors dissipate power in the core and in the
windings. Although exact calculations of these
losses can be complex and difficult, they can be
readily estimated using data sheet parameters
available from magnetic component suppliers....
Modeling Integrated Magnetic Components
Mar 1, 2005
Using finite element analysis (FEA) techniques, a
simulation tool generates frequency-dependent
models of integrated magnetic components, accounting for the materials and winding layout
of the magnetic component....
Boosting Power Supply Efficiency for Desktop Computers
Feb 1, 2005
Adopting active PFC for harmonic-reduction while
making other architectural- and component-level
improvements can cost-effectively reduce losses
in ATX power supplies....
Buck Converter Losses Under the Microscope
Feb 1, 2005
The synchronous buck converter is the most popular topology in the PC market. The race between the top MOSFET companies is heating up with the rush to design new devices that are faster and better suited to meet the demands of the microprocessor makers....
