Vincotech 新功率模块结构改进快速开关电源效率的应用



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New Power Module Structure for Efficiency Improvement in Fast
Switching Power Applications (>50kHz, >1kW)
Temesi, Zsadany, Frisch Mar. 2005, TYCO Electronics / Power Systems
Power applications are forced to work at higher frequencies. This is caused by the
continuous demand for compact and lightweight solutions and higher frequency reduce
the mechanic size of the passive components as transformers, inductors and capacitors.
Conventional power sources use big and heavy transformers running at 50 or 60Hz. At
any given power to be transformed, the volume of the transformer is indirect
proportional to the switching frequency. This means if the switching frequency will be
increased, the volume will be correspondingly smaller - for the same power. The new
generation of Switched Mode Power Supplies (SMPS) are running at ca. 100kHz so that
the weight and the volume of the transformer is reduced to a minimum of i.e. 5% of the
conventional 50Hz solution. But with high switching frequency the challenge is to
optimize the overall efficiency of the converter were the switching losses become a
significant portion of the total losses in the system.
Power applications with switching
frequencies of 50kHz and above require
to pay specific attention to the switching
mode and component selection as well
as the layout and its parasitic side
Switching losses which are becoming the
dominant portion of the power losses at
higher frequencies can be reduced by
either using higher performance
components or by optimizing the
matching of the used components and
their arrangement to each other. While
the first solution is introducing higher
system cost, optimizing components
matching and arrangement can provide
similar or even better results at lower
cost. Power integrated modules are able
to offer these advantages over discrete
solutions and provide higher switching
speed at lower total losses.
The following paper is focusing on hard
switching PFC applications, SMPS and
welding inverters with zero-voltage
switching used at frequencies above
50kHz and an electrical output power of
more than 1kW; it provides a detailed
comparison for different transistor types
(MOSFET, IGBT), technologies (NPT-, PT)
of different suppliers and the
corresponding diodes. This comparison is
shown in this paper both in theory and
by actual measurements.
The paper introduces:
The most commonly used switching
modes and their critical system
Comparison of the different
semiconductor components available
on the market and their specific
advantages and disadvantages.
Influence of the semiconductor
parameters for the power loss for the
different switching modes used in
today’s power applications
Different examples for component pin
outs and corresponding PCB layouts
and their influence on the system
performance for fast switching power
Guidance for effective interpretation
of values given in power component
data sheets
Background for the Loss
The performance limitation for fast
switching applications is in most cases
the power dissipation caused by
electrical losses in the semiconductors.
That’s why efficiency improvement is the
most important target to achieve a cost
effective design. With the calculation of
the expected losses it is possible to
compare the different solutions in
advance without building them up on the