PWM: From a Single Chip To a Giant Industry
Oct 1, 2005
A pulse-width modulation control chip invented
in 1975 spurred the development of switching
power supplies, leading to a power control IC
industry that today is measured in billions of
dollars....
Improving the Performance of Flyback Power Supplies
Sep 1, 2005
Innovative MOSFETs and flyback controllers help designers meet challenging efficiency
and power density requirements, while also
satisfying demands for reliability and low cost....
Power Supply Redesign Raises EMC Issues
Sep 1, 2005
Because even modest design changes can cause a supply to fail FCC/CE tests for conducted and radiated noise, designers need to understand
where noise originates and how to reduce it to acceptable levels....
Environmental Testing Benefits Power Electronics
Jul 28, 2005
Integrating test and measurement with environmental testing can improve product robustness, product reliability and production processes, increasing yields and reducing warranty expenses and exposure....
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....
New Energy Standards Banish Linear Supplies
Mar 1, 2005
With the California Energy Commission mandating
minimum levels of efficiency for external
power supplies sold in the state, many linear
supplies will need to be redesigned using
switch-mode technology....
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....
Biasing the TL431 for Improved Output Impedance
Jan 1, 2005
The TL431 is a well-known voltage reference integrated circuit used in Switch-Mode Power Supply (SMPS) feedback loops. Combining a reference voltage and...
Power Transformer Attenuates Harmonics
Oct 1, 2004
The mains of the world were constructed as a giant copper causeway to transport electricity from the generating station to our homes and factories. Today's...
Simplifying Power Factor Correction in SMPS
Oct 1, 2004
One in the quest for improved energy efficiency and power quality is the use of active harmonic filter power factor correction (PFC) in switched-mode...
Overpower Compensation for Current-Mode Supplies
Sep 1, 2004
A current-mode power supply works by observing the peak current circulating in an inductance. By adjusting the peak current setpoint at which the power...
DIN Rail Supplies Offer a Range of Options
Sep 1, 2004
Last month's Analog Feedback department discussed some of trends and technical issues shaping the development of DIN Rail power supplies. That article...
SiC Schottky Diodes in Power Factor Correction
Aug 1, 2004
Active Power Factor Correction (PFC) is widely used in today's power supplies. Government regulations and customer requirements must be satisfied when...
