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发表于 2007-4-9 13:21:46
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是MIT的,不是Berkeley
LABORATORY FOR ELECTROMAGNETIC AND ELECTRONIC SYSTEMS
MASSACHUSETTS INSTITUTE OF TECHNOLOGY, ROOM 10–171
CAMBRIDGE, MASSACHUSETTS 02139
Abstract
This document describes several aspects relating to
the design of dc-dc converters operating at frequencies in the
VHF range (30-300 MHz). Design considerations are treated
in the context of a dc-dc converter operating at a switching
frequency of 100 MHz. Gate drive, rectier and control designs
are explored in detail, and experimental measurements
of the complete converter are presented that verify the design
approach. The gate drive, a self-oscillating multi-resonant circuit,
dramatically reduces the gating power while ensuring fast onoff
transitions of the semiconductor switch. The rectier is a
resonant topology that absorbs diode parasitic capacitance and is
designed to appear resistive at the switching frequency. The small
sizes of the energy storage elements (inductors and capacitors)
in this circuit permit rapid start-up and shut-down and a
correspondingly high control bandwidth. These characteristics
are exploited in a high bandwidth hysteretic control scheme that
modulates the converter on and off at frequencies as high as
200 kHz. |
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