Simulation of Power Electrical Circuits of Automotive

In this paper, a procedure for identifying the transfer functions of Park’s dq-axis model of a synchronous generator has been developed for analyzing automotive charging systems. This application note focuses on one particular aspect of charging system design: alternator/regulator performance. This voltage regulated power system must operate satisfactorily under extreme transient conditions. Two of these transients, a load-dump condition (heavy electrical load switching with a disconnected battery), and an engine rapid crankshaft speed-up, are examined. It will be shown that the parameters of this model can be easily identified from standstill timedomain data. The validity of the theoretical model has been verified by comparing time-domain simulations with measurements taken from the direct-drive synchronous generator.