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- W1495182907 abstract "Passive component volume is a perennial concern in power conversion. With new circuit architectures operating at extreme high frequencies it becomes possible to miniaturize the passive components needed for a power converter, and to achieve dramatic improvements in converter transient performance. This thesis focuses on the development of a Very High Frequency (VHF, 30 300 MHz) dc-dc boost converter using a MOSFET fabricated from a typical power process. Modeling and design studies reveal the possibility of building VHF dc-dc converters operable over the full automotive input voltage range (8 18 V) with transistors in a 50 V power process, through use of newly-developed resonant circuit topologies designed to minimize transistor voltage stress. Based on this, a study of the design of automotive boost converters was undertaken (e.g., for LED headlamp drivers at output voltages in the range of 22 33 V.) Two VHF boost converter prototypes using a Φ2 resonant boost topology were developed. The first design used an off the shelf RF power MOSFET, while the second uses a MOSFET fabricated in a BCD process with no special modifications. Soft switching and soft gating of the devices are employed to achieve efficient operation at a switching frequencies of 75 MHz in the first case and 50 MHz in the latter. In the 75 MHz case, efficiency ranges to 82%. The 50 MHz converter, has efficiencies in the high 70% range. Of note is low energy storage requirement of this topology. In the case of the 50 MHz converter, in particular, the largest inductor is 56 nH. Finally, closed-loop control is implemented and an evaluation of the transient characteristics reveals excellent performance. Thesis Supervisor: David J. Perreault Title: Associate Professor of Electrical Engineering" @default.
- W1495182907 created "2016-06-24" @default.
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- W1495182907 date "2007-01-01" @default.
- W1495182907 modified "2023-09-26" @default.
- W1495182907 title "Design of a Very High Frequency dc-dc Boost Converter" @default.
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