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This book presents physics-based electro-thermal models of bipolar
power semiconductor devices including their packages, and describes
their implementation in MATLAB and Simulink. It is a continuation
of our first book Modeling of Bipolar Power Semiconductor Devices.
The device electrical models are developed by subdividing the
devices into different regions and the operations in each region,
along with the interactions at the interfaces, are analyzed using
the basic semiconductor physics equations that govern device
behavior. The Fourier series solution is used to solve the
ambipolar diffusion equation in the lightly doped drift region of
the devices. In addition to the external electrical
characteristics, internal physical and electrical information, such
as junction voltages and carrier distribution in different regions
of the device, can be obtained using the models. The instantaneous
dissipated power, calculated using the electrical device models,
serves as input to the thermal model (RC network with constant and
nonconstant thermal resistance and thermal heat capacity, or
Fourier thermal model) of the entire module or package, which
computes the junction temperature of the device. Once an updated
junction temperature is calculated, the temperature-dependent
semiconductor material parameters are re-calculated and used with
the device electrical model in the next time-step of the
simulation. The physics-based electro-thermal models can be used
for optimizing device and package design and also for validating
extracted parameters of the devices. The thermal model can be used
alone for monitoring the junction temperature of a power
semiconductor device, and the resulting simulation results used as
an indicator of the health and reliability of the semiconductor
power device.
Computers play an important role in the analyzing and designing of
modern DC-DC power converters. This book shows how the widely used
analysis techniques of averaging and linearization can be applied
to DC-DC converters with the aid of computers. Obtained dynamical
equations may then be used for control design. The book is composed
of two chapters. Chapter 1 focuses on the extraction of
control-to-output transfer function. A second-order converter (a
buck converter) and a fourth-order converter (a Zeta converter) are
studied as illustrative examples in this chapter. Both ready-to-use
software packages, such as PLECS (R) and MATLAB (R) programming,
are used throught this chapter. The input/output characteristics of
DC-DC converters are the object of considerations in Chapter 2.
Calculation of input/output impedance is done with the aid of
MATLAB (R) programming in this chapter. The buck, buck-boost, and
boost converter are the most popular types of DC-DC converters and
used as illustrative examples in this chapter. This book can be a
good reference for researchers involved in DC-DC converters
dynamics and control.
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