Power supply system

• US 20040155624A1
• Filed: 11/24/2003
• Published: 08/12/2004
• Est. Priority Date: 12/06/2002
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Miyazaki, Hideki, Kinoshita, Takuya, Amano, Masahiko, Kanazawa, Hiroshi
• Application Number:
  US10/718,552
• Publication Number:
  US 20040155624A1
• Time in Patent Office: Days
• US Class Current: 320/104
• CPC Class Codes: B60L 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60L 2260/54 Energy consumption estimation
• CPC Class Codes: H02J 1/14 Balancing the load in a network
• CPC Class Codes: H02J 7/1438 in combination with power supplies for loads other than batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A power supply system having a power supply including an electric generator and a battery, and a power control unit for controlling electric power supplied from said power supply to an electric load, wherein the power supply system has battery condition sensing means for sensing the operative condition of the battery and load condition sensing means for sensing the operative condition of the electric load, and the power supply system has a function in which the variation of the power supply voltage at the time of the operative requirement of the electric load is estimated based on the condition of said battery and the operative condition of said electric load, and the current of the electric load is limited when the estimated electric power supply voltage is smaller than a predetermined value.

Claims

1. A power supply system having a power supply including an electric generator and a battery, and a power control unit for controlling electric power supplied from said power supply to an electric load, wherein said power supply system has battery condition sensing means for sensing the operative condition of said battery and load condition sensing means for sensing the operative condition of said electric load, and said power supply system has a function in which the variation of the power supply voltage at the time of the operative requirement of said electric load is estimated based on the condition of said battery and the operative condition of said electric load, and the current of the electric load is limited when said estimated electric power supply voltage is smaller than a predetermined value.

2. A power supply system according to claim 1 wherein the variation of said power supply voltage is estimated in consideration of the maximum output current of said electric generator.

3. A power supply system according to claim 1 wherein the current of said electric load is limited in consideration of the level of importance said electric load and the magnitude of current.

4. A power supply system according to claim 1 wherein it has a function in which the start of operation of said electric load is delayed by a predetermined time at the time of the operative requirement of the electric load.

5. A power supply system according to claim 1 wherein a command to make the rise of said electric load less severe based on said battery condition at the time the operative requirement of the electric load is provided.

6. A power supply system having a power supply including an electric generator and a battery, and a power control unit for controlling electric power supplied from said power supply to an electric load, wherein said power supply system has battery condition sensing means for sensing the operative condition of said battery, and said power supply system has a function in which a target voltage value to electric generator is commanded based of the battery condition sensed by said battery condition sensing means.