Apparatus for driving electrical loads provided at a car

• US 5,886,419 A
• Filed: 07/08/1998
• Issued: 03/23/1999
• Est. Priority Date: 08/31/1995
• Status: Expired due to Fees

• Current Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Original Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: Saito, Hiroyuki, Koni, Mitsuru
• Primary Examiner(s): Elms, Richard T.
• Application Number:
  US09/111,775
• Time in Patent Office: 258 Days
• Field of Search: 307/9.1, 307/10.1, 307/10.6, 307/10.7, 307/11, 307/38, 123/179.1, 123/179.28, 701/36, 290/47, 322/62-64
• US Class Current: 307/10.1
• CPC Class Codes: B60R 16/0315 using multiplexing techniques multiplexing for transmission of signals G08C15/00; multiplexing for electrical communication in general H04J
• CPC Class Codes: H02H 9/001 limiting speed of change of electric quantities, e.g. soft switching on or off progressive control of electronic switches for eliminating interferences H03K17/16

Abstract

A power supply system for a car in which a first group of loads is selected by a key switch and fed power via a fuse, while a second parallel connected group of loads is fed power without a fuse via respective ones of control units coupled to transmission lines for controlling each of the second group of loads.

Claims

1. A power supply system for a car, comprising:

a plurality of control units coupled via transmission lines;

a first group of loads selected by a key switch, to which power is fed via a fuse; and

a second group of loads connected to a power line without a fuse, in parallel, via a respective one of the plurality of control units for controlling each of said second group of said loads.

2. A power supply system according to claim 1, further including a generator, current fed to field coils of said generator being controlled in response to control states of said first and second groups of said loads.

3. A power supply system according to claim 1, further including an input circuit for inputting a position signal of said key switch.

4. A power supply system according to claim 1, wherein at least one of said first and second groups of said loads is controlled by a PWM method.