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Output power increase at idle speed in alternators

The use of a Switched Mode Rectifier (SMR) allows automotive alternators to operate at a load-matched condition at all operating speeds, overcoming the limitation of optimum performance at just one speed. While use of an SMR and load matching control enables large improvements in output power at cruise speed, no extra power is obtained at idle. This document proposes the implementation of a new SMR modulation strategy capable of improving output power at idle speed without violating thermal or current limits of the alternator. The output power improvements at idle (with no cost increase) makes the use of an SMR a more attractive option for the industry, and will facilitate introduction of the new 42V electrical standard in the near future. The proposed research will investigate the design and realization of a suitable modulation strategy and will experimentally demonstrate this new approach. Thesis Supervisor: David J. Perreault Title: Associate Professor of Electrical Engineering Thesis Supervisor: Dr. Thomas A. Keim Title: Principal Research Scientist, Laboratory for Electromagnetic and Electronic Systems