Development of an alternator correlatable load dump model
by D.D. Bailey, J.G. Olin, F.D. Esenwein
International Journal of Vehicle Design (IJVD), Vol. 6, No. 6, 1985

Abstract: The electrical transient resulting from the sudden loss of the battery as a load to the alternator is defined as load dump. By modelling the alternator as an exponentially decaying ideal current source with a speed dependent source impedance (a Norton's equivalent circuit) model parameters can be related to actual alternator characteristics. Applications of this model to prediction of load dump waveforms and energy dissipation in suppression devices as a function of vehicle operating conditions and alternator type are given. Implementation of the model in hardware results in a bench top load dump simulator for component testing. Methods of specifying proper suppression device parameters are discussed and computer simulations of suppression device stressing are included.

Online publication date: Sun, 25-May-2014

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