Topics
[+]
BLDC Ripple Torque Reduction via Modified Sinusoidal PWM
Abstract - A brushless
direct current (BLDC) fan motor driver system using sinusoidal
PWM (SPWM) is introduced. The driver board is assembled in
the motor to minimize the system size. Based on the signal
from the hall position sensor on the board, the controller
generates the SPWM input for the power module to drive the
BLDC motor. Because it is a sinusoidal PWM instead of a square
PWM, both vibration and noise are lower. Experimental results
are presented to verify the stability of the driver system.
[+]
Board Level Evaluation of Power Quad Flat No-Lead (PQFN)
Packages
Abstract - Evaluations
in surface mount board assembly are conducted for two advanced
packages, the PQFN3x3 and PQFN5x6. These packages offer very
low inductance for better circuit performance. This paper
will provide practical guidance about PCB mounting and thermal
management. It will evaluate processes such as stencil printing,
component placement and reflow. Stencil design has shown
to be the most critical. In the reflow process, exposure
to temperature above its rating will result in reliability
risks. Because of this risk, the thermocouple location must
be considered in temperature profiling. Temperature cycle
test, drop test, vibration and bending tests are conducted
to determine reliability of the assembly process. Thermal
simulation is conducted using ANSYS® software, showing the
effect if voids are present in the solder between the package
terminals and the land pad. Finally, recommendations are
presented to ensure successful assembly.
[+]
Design Considerations for Asymmetric Half-Bridge Converters
Abstract - Among various
kinds of soft-switching converters, the asymmetric PWM half-bridge
converter has drawn considerable attention due to its simplicity,
inherent zero voltage switching (ZVS) capability and fixed-frequency
operation. This paper presents an analysis and reviews practical
design considerations for the asymmetric half-bridge converter.
It includes designing the transformer and selecting the components.
The step-by-step design procedure explained with a design
example will help engineers design the asymmetric half bridge
converter.
[+]
Designing Auxiliary Power Supplies for High Efficiency and
Low Standby Power
Abstract - Auxiliary
power supplies are required to have low standby power consumption
at light load conditions. These power supplies also offer
desirable features such as low cost, high efficiency and
a Line Under Voltage Lockout (UVLO) function to detect the
input voltage so the main power supply will not have to operate
at low input voltage ranges. Fairchild’s FSQ510 has been
specifically designed for low power consumption and valley
switching control and is ideal for auxiliary power supplies.
This paper will outline a design procedure for an auxiliary
power supply using the FSQ510.
[+]
From Powder to Transformers
Abstract - The design
of the main transformer is a critical part of designing a
switch mode power supply. Understanding the process of making
cores from powder into a final core shape, and understanding
the effects of parameters like core loss, permeability and
flux density, designers are better able to choose the right
material to achieve the smallest size with lowest losses
and reduced cost. With the additional understanding of AC
losses and layer arrangements, designers can also optimize
the windings to create a solid magnetic design with small
size and high efficiency.
[+]
Understanding Interleaved Boundary Conduction Mode PFC Converters
Abstract - Boundary conduction
mode power factor converters are widely used in lower power
off-line power supplies. Their application at higher power
levels is less practical due to the high amplitude of the
inductor ripple current that puts a burden on the EMI filter
and can be a significant source of power dissipation in the
boost inductor and power switch of the converter. Interleaving
two of these boundary conduction mode converters mitigates
the input filter problem and to a certain extent the issue
of high RMS currents of the semiconductor devices. Interleaved
BCM PFC circuits are becoming popular in the industry. This
paper analyzes the advantages of such a solution, highlights
critical design issues related to power factor correction
in general, and addresses the specific requirements and potential
solutions to control an interleaved boundary conduction mode
power factor converter.
[+]
Using MOSFET Selection to Minimize Losses in Low-Output-Voltage
DC-DC Converters
Abstract - The role of
the Power MOSFET in achieving high efficiency converter design
is the focus of this paper. It gives a brief overview of
current low voltage MOSFET trench technologies, along with
a discussion of on resistance versus gate charge tradeoffs
for MOSFETs optimized for use as either control or synchronous
switches. It also covers the importance of the integrated
Schottky diode (SyncFET) in synchronous rectification,
and the necessity of packaging technologies with low parasitic
inductance and resistance.
The MOSFET-to-circuit interaction will be discussed in detail
with the aid of TCAD mixed-mode simulations. All relevant
MOSFET switching events will be analyzed: common source inductance
versus drain current rise and fall, body diode conduction
and reverse recovery, external Schottky diode layout challenges
versus SyncFET advantages, and elimination of shoot-through
currents from gate bounce. The simulation of these MOSFET
power losses is compared for different amounts of circuit
inductance and used as background for discussing measured
converter efficiency data. A review of popular MOSFET loss
equations is also included.
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[+] Asia
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[+] Latin America
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52-55-55520895
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