Vehicle-mounted electrical generating system in which field current of electric generator supplying power to high-voltage system is derived from supply voltage of low-voltage system

摘要

A vehicle-mounted electrical generating system has a first voltage system which operates from a high supply voltage and a second voltage system which operates from a low supply voltage that is substantially constant, and an electrical generator for supplying power to operate the first voltage system at a voltage determined by the level of field current of the generator, with the field current being derived from the low supply voltage of the second voltage system. The specifications of the field winding of the electrical generator can thereby be optimally established irrespective of the value of the high supply voltage.