Type of Document Dissertation Author Barlow III, Fred D URN etd-071399-153442 Title Electronic Packaging Strategies for High Current DC to DC Converters Degree PhD Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Elshabini-Riad, Aicha A. Committee Chair Besieris, Ioannis M. Committee Member McGrath, James E. Committee Member Scales, Wayne A. Committee Member Sergent, Jerry E. Committee Member Keywords
- DC/DC Converters
- Electronic Packaging
- High Current
Date of Defense 1999-06-14 Availability unrestricted AbstractCurrent trends in electronics are toward the use of reduced
voltages. In the past, 5 V and higher voltages have been the standard,
however, currently, 3.3V and 2.5V circuits are becoming increasingly
common. While the operating voltage is decreasing, electronic
systems are becoming more complex. The net result is that in many,
cases, the current required by the next generation of electronics will
be far greater than in the past. These increased currents and low
voltages pose dramatic problems for designers not the least of which
is the effect of electronic packaging and circuit implementation on
the overall power supply performance.
In addition, for many applications, space and weight are at a
premium and converters are needed to power low voltage circuit
assemblies that are highly efficient, low in weight, and small in total
height and foot print.
This dissertation addresses these trends and needs through the
design, fabrication and evaluation of a 3.3V DC/DC converter.
Designs of 3.3V, 2.5V, and 1.5V are presented and evaluated while a 3.3V, 100 watt converter with a power density of 157 watts/in 3 has been fabricated
and evaluated in a miniature form. This converter utilizes a implementation
strategy developed by the author which was selected due to its ability to handle the
current levels required and its compact size.
Specific contributions of this work include:
* Analysis of the effects of packaging on low voltage high current converters in
order to provide a guideline for converter implementation. This analysis has been
performed for 3.3 V, 2.5 V, and 1.5 V designs, respectively.
* Development of high efficiency 2.5 V, 100 watt and 1.5 V, 75 watt designs based
on previously reported half bridge topologies.
* Development of a packaging strategy which allows the fabrication of low voltage
compact converters with high efficiency. A 3.3 V converter has been fabricated
and with the simulated data validated these experimental results.
For very low (less than 50 watts and / or less than 10 amps) and high power
levels (hundreds of amps or kilowatts), the implementation strategy is normally
clear; PCB/IMS, and DBC respectively. However, for applications in the middle
range of power or current level, the optimum implementation is often unclear. The
question that this work seeks to answer is under what conditions are different
implementation schemes most suitable.
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