Patent ID: 7224148
Filing Date: 2007-05-29
Classification: H02P

Abstract:
1. A vehicle power-generation control unit comprising: a voltage detecting circuit detecting a generation voltage of a vehicle generator mounted on a vehicle and driven by an engine of said vehicle; a switching device allowing an exciting current to flow into an exciting winding of said vehicle generator when said switching device is in an on state; an average duty ratio detecting circuit detecting a temporal average duty ratio of said switching device on the basis of said generation voltage; an enhanced duty-cycle signal generating circuit generating an enhanced duty-cycle signal having a duty ratio equal to said temporal average duty ratio detected by said average duty ratio detecting circuit added with a supplementary duty ratio determined depending on at least one of vehicle information representing a state of said vehicle and vehicle generator information representing a state of said vehicle generator; and a driver circuit driving said switching device with said duty ratio of said enhanced duty-cycle signal generated by said enhanced duty-cycle signal generating circuit when said generation voltage detected by said voltage detecting circuit is lower than a predetermined target voltage.