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Development of High Efficiency Rectifier with MOSFET in “eSC Alternator”
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
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Alternator, which supplies electric energy to a battery and electrical loads when it is rotated by engine via belt, is one of key components to improve vehicle fuel efficiency. We have reduced rectification loss from AC to DC with a MOSFET instead of a rectifier diode. It is important to turn on the MOSFET and off during a rectification period, called synchronous control, to avoid a current flow in the reverse direction from the battery. We turn it off so as to remain a certain conduction period through a body diode of the MOSFET before the rectification end. It is controlled by making a feedback process to coincide with an internal target conduction period based on the rotational speed of the alternator. We reduced a voltage surge risk at turn-off by changing the feedback gain depending on the sign of the time difference between the measured period and the target. In addition to reducing the rectification loss, reducing copper loss with low resistance coil winding and iron loss with magnetic steel contributed to improve the alternator efficiency by 10%. As a result, we achieved 2.6g/km CO2 reduction in a petrol-fuelled vehicle calculated by a guideline with a reference to .
CitationNakanishi, M., "Development of High Efficiency Rectifier with MOSFET in “eSC Alternator”," SAE Technical Paper 2017-01-1228, 2017, https://doi.org/10.4271/2017-01-1228.
Data Sets - Support Documents
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- EUROPEAN COMMISSION, “Technical Guidelines for the preparation of applications for the approval of innovative technologies pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council, Ver. Feb. 2013.