Method for maintaining a direct voltage at the input of a DC/AC voltage converter, recording medium for this method, and electric vehicle
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United States of America Patent
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Oct 14, 2008
Grant Date -
Jun 21, 2007
app pub date -
Nov 21, 2006
filing date -
Oct 7, 2005
priority date (Note) -
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Abstract
This method maintains a direct voltage at the input of a DC/AC voltage converter in order to maintain an asynchronous motor in a magnetised state, the input of the converter being connected to a DC supply bus of an electric vehicle, and comprises, in a free wheel mode during which the vehicle coasts and the bus is disconnected from a catenary: a) a step (76) for magnetising the motor, then b) a step (78) for operating the motor as a generator of alternating voltage, then c) a step (72) for stopping the converter when the direct voltage of the bus reaches an upper threshold, then d) a step (74) for maintaining the converter in the idle state as long as the direct voltage of the bus remains higher than a minimum direct magnetisation voltage of the asynchronous motor.
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