| Summary: | 碩士 === 逢甲大學 === 自動控制工程研究所 === 86 === In this thesis, a 100V/20A buck-type switching
power regulator using a fuzzy controller
is studied and designed. The switching
power transistor used in this study is an
IGBT transistor that is known to preserve the
advantage of both BJT and MOSFET transistors.
In the design, the fuzzy control law is implemented
on an 89C51 single chip processor. The output voltage
is regulated by feeding back the output voltage
to the 89C51 single chip processor. Based on
the feedback signal, the fuzzy rule determines
the duty cycle of the PWM signal that
is generated to switch the power transistor.
Furthermore, several protection circuitry''s
such as over-current protection, soft
start protection, and dv/dt and di/dt snubbers
are designed in this study. The experimental
result shows that the output voltage can be
regulated within 2.5% under 30% input voltage variation.
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