High frequency power conversion architecture for grid interface
2016
With the present ac-voltage distribution system,
ac-dc converters are key components for driving many dc voltage
applications from the ac grid voltage. There are a lot of
electronic devices that natively operate from the dc voltage
including light emitting diodes (LEDs), personal and laptop
computers, and smart phones; for all of them there is a drive to
increase functionality and to reduce the volume at the same time.
The desire for further miniaturization is, however, facing a
dominant obstacle strained by the performance requirements on power
electronic circuits. In this thesis, a design technique for
high-performance ac-dc power converters will be presented. A new
grid interface ac-dc conversion architecture and associated circuit
implementations are proposed along with novel control methods. This
approach simultaneously address design challenges associated with
high performance (e.g., high efficiency, high power factor,
miniaturization, and high reliability/lifetime) of ac-dc power
conversion systems. The proposed architecture is suitable for
realizing ac-dc converters that switch in the HF range (3-30 MHz)
with relatively low-voltage components and with zero-voltage
switching (ZVS) conditions, enabling significant converter size
reduction while maintaining high efficiency. Moreover, the proposed
approach can achieve reasonably high power factor about 0.9, while
dynamically buffering twice-line frequency energy using small
capacitors operating with large voltage swings over the ac line
voltage cycle. The ac-dc converter design shows that excellent
combinations of power density, efficiency, and power factor can be
realized with this approach.
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