Power distribution apparatus

• US 20030030324A1
• Filed: 08/06/2002
• Published: 02/13/2003
• Est. Priority Date: 08/07/2001
• Status: Active Grant

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Hasegawa, Tetsuya, Tamai, Yasuhiro
• Granted Patent: US 7,116,009 B2
• Time in Patent Office: Days
• US Class Current: 307/9.1
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004
• CPC Class Codes: H02J 9/04 in which the distribution system is disconnected from the normal source and connected to a standby source

Abstract

A power distributing apparatus is provided to reduce the number of voltage converters. The power distributing apparatus 1 includes a power source part 4 for supplying a power of 42V, an electrical connection box 7 connected with the part 4 through a power line 5, and a plurality of electronic control units 8a, 8b . . . , 8n. The electrical connection box 7 has a regular-supply converter 9 to convert a high voltage of 42V to an intermediate voltage higher than a load voltage of 5V. The regular-supply converter 9 can exhibit a high conversion efficiency when the apparatus is operated under high load. Each of the electronic control units 8a, 8b . . . , 8n has a series regulator 14 to convert the intermediate voltage to the load voltage. Owing to the supply of voltage higher than the load voltage by the regular-supply converter 9, there is no need to consider inconvenience due to voltage drop between the converter and a remote load.

Claims

1. A power distributing apparatus comprising:

a power source part for supplying power of a high voltage;

an upstream-side power distributing part connected with the power source part through a power line thereby to accept power supply of the high voltage from the power source part;

a plurality of downstream-side power distributing parts connected with the upstream-side power distributing part through power lines thereby to accept power supply from the upstream-side power distributing part and supply power of a load voltage to a plurality of loads;

a regular-supply converter disposed in the upstream-side power distributing part to convert the high voltage to an intermediate voltage lower than the high voltage and higher than the load voltage, the regular-supply converter capable of converting a voltage with a high conversion efficiency when the power distributing apparatus is operated under high load; and

a plurality of series regulators respectively disposed in the downstream-side power distributing parts to convert the intermediate voltage to the load voltage.

2. The power distributing apparatus as claimed in claim 1, further comprising a standby-current supply converter disposed in the upstream-side power distributing part to convert the high voltage to the intermediate voltage, the stand-by current supply converter capable of converting a voltage with a high conversion efficiency when the power distributing apparatus is operated under light load;

wherein both of the regular-supply converter and the stand-by current supply converter supply a stand-by current to the downstream-side power distributing parts.

3. The power distributing apparatus as claimed in claim 2, further comprising a current sensor for detecting a current flowing from the upstream-side power distributing part to the downstream-side power distributing parts and a controller for controlling the operations of the regular-supply converter and the stand-by current supply converter;

wherein, under condition that the power distributing apparatus is mounted on a vehicle having an ignition switch, the controller operates so as to;

activate the regular-supply converter thereby to carry out power supply to the downstream-side power distributing parts when the ignition switch is turned on;

activate the regular-supply converter thereby to carry out the power supply when the ignition switch is turned off and a current value detected by the current sensor is more than a predetermined value; and

activate the stand-by converter thereby to carry out the power supply when the ignition switch is turned off and a current value detected by the current sensor is less than the predetermined value.

4. The power distributing apparatus as claimed in claim 1, wherein the intermediate voltage is somewhat higher than the load voltage.

5. The power distributing apparatus as claimed in claim 1, wherein the downstream-side power distributing parts are electronic control units.

6. The power distributing apparatus as claimed in claim 5, wherein the intermediate voltage is a voltage of power for driving the electronic control units.