Valeo Equipements Electriques Moteur

Jeremy Lagrange

Pierre Tisserand

Pierre Chassard

Pierre Sardat

Laurent Labiste

Laurent De Lamarre

Romuald Morvany

Guillaume Duthilleul

Pierre-François Ragaine

The excitation circuit according to the invention controls an excitation current (lexc) in an excitation winding () of an alternator by means of an on-board network voltage control loop (Vbat+,) of the vehicle, and comprises a first MOS power transistor () which is connected between a first positive supply terminal Vbat+ (), and a first excitation terminal (), and is controlled by the control loop by means of a first control circuit (), a second MOS power transistor (), which is connected between the first excitation terminal and a second excitation terminal () which is connected to a ground terminal () and acts as a free wheel diode, whilst being controlled by means of a second control circuit (). According to the invention, the circuit additionally comprises a control loop () of a drain-source voltage (Vds) of the second transistor.

Excitation circuit of a motor vehicle alternator, voltage regulator, and alternator which incorporates it

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Limeil-Brevannes, France

Jeremy Lagrange