Power source unit for an automotive vehicle

Claim 2

A power source unit for an automotive vehicle as set forth in Claim 1, wherein said rectification means includes a lower level diode bridge having a common anode, a higher level diode bridge having a common cathode forming a first output section, a silicon controlled rectifier bridge having a common cathode forming a second output section, and said voltage control means opens and closes said silicon controlled rectifier bridge depending upon a terminal voltage of said second power accumulation means.

Claim 3

A power source unit for an automotive vehicle as set forth in claim 1 or 2, wherein said first load is irrelevant to a starting of an engine, and said second load is a load related to a starting of an engine.

Claim 4

A power source unit for an automotive vehicle comprising: a power generator having a stator winding and a field winding and being driven by an engine; a rectification means for converting an alternating current output generated on said stator winding to a direct current output, and outputting the direct current output through first and second output sections; a first power accumulation means connected in parallel with a first load, for receiving a power supply through the first output section; a second power accumulation means connected in parallel with a second load, for receiving a power supply through the second output section; a power generator output control means, having a first switching means for controlling a power supply for said field winding, for adjusting an output of the alternator by controlling said first switch depending upon a terminal voltage of the first power accumulating means, to maintain the terminal voltage of the first power accumulating means, which receives a power supply through the first output section of the rectification means, at a predetermined level; and a voltage control means, having a second switching means responsive to a drop in a terminal voltage of the second power accumulation means to a predetermined level, for permitting a power supply to the second power accumulation means through the second output section of the rectification means, and maintaining the terminal voltage of the second power accumulation means at a predetermined level.

Claim 5

A power source unit for an automotive vehicle as set forth in claim 4, wherein a conduction ratio of said first and second switching means is controlled for adjusting a level difference of terminal voltages at said first and second power accumulating means.

Claim 6

A power source unit for an automotive vehicle as set forth in claim 4 or 5, wherein one of said first and second power accumulating means having a higher terminal voltage is connected to a load associated with a system for starting an engine.

Claim 7

A power source unit for an automotive vehicle as set forth in claim 4, wherein said first and second loads are respectively a load associated with a system for starting an engine and a load irrelevant to a starting of the engine, said alternator output control means controlling and maintaining the terminal voltage of said first power accumulation means to a first predetermined voltage level, and said voltage control means controlling the terminal voltage of said second power accumulation means to second predetermined voltage level lower than said first predetermined voltage level.

Claim 8

A power source unit for an automotive vehicle as set forth in claim 1, which further comprises a boosting transformer connected to said power generator, and a rectifier means for rectifying the alternating current voltage based on the output of said boosting transformer, said rectifier means having a third output section connected to a third load.

Claim 9

A power source unit for an automotive vehicle as set forth in claim 8, wherein said second power accumulation means includes a relay driver circuit for driving said third output section.

Claim 10

A power source unit for an automotive vehicle as set forth in claim 1, which further comprises a reactor means disposed between the output section of said power generator output control means and said second power accumulation means, and a diode disposed between said the output section of said alternator output control means and the ground.