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|Title: ||Microprocessor controlled novel 4-quadrant DC-DC converter|
|Authors: ||Xu, Aidong|
|Issue Date: ||1992|
|Publisher: ||© Aidong Xu|
|Abstract: ||The thesis describes a novel 4-quadrant DC-DC converter,
supplied by a 28V DC voltage source, with an output voltage
which may be continuously varied between +180V and -180V DC.
A prototype 1.2kW DC-DC converter was designed and built,
with emphasis given to the optimization of both the converter
size and efficiency. This was achieved by means of a
computer-based simulation study, which determined the
optimal switching frequency and the size of the inductors
and capacitors while maintaining a high unit efficiency.
Mos-Gated Bimos switches, which feature the advantages of
both mosfets and bipolar transistors, were developed to
achieve high switching speed during high power operation.
A digital-controlled DC servo system based on a 16-bit
Intel 8086 microprocessor was designed, to provide both
motor speed and position control. Speed and position detection
circuits and the structure and the interfacing arrangement
of the microprocessor system were designed and
constructed. Several control algorithms were developed,
including PID Control Algorithm and Current-Limit Control
Algorithm. Based on open loop transfer function of the system,
derived through mathematical modelling using the State-Space
Averaging Method, the constants for the control
algorithms were obtained to meet the dynamic performance
specified for the system.
Computer simulation was carried out to assist with the
design of the converter and the control system.
It is expected that drives into which the novel converter
is incorporated will find many applications in situations
where accurate positional control is required, particularly
in battery-operated DC-servo system, such
as satellite system,
robots and some military vehicles.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Mechanical, Electrical and Manufacturing Engineering)|
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