Device for supplying power to a two-voltage vehicle electric system

• US 20060145536A1
• Filed: 01/14/2004
• Published: 07/06/2006
• Est. Priority Date: 02/10/2003
• Status: Active Grant

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Siemens AG
• Inventors: Hackl, Stefan, Knorr, Rainer, Lugert, Gunter
• Granted Patent: US 7,436,080 B2
• Time in Patent Office: Days
• US Class Current: 307/10.100
• CPC Class Codes: H02J 1/082 Plural DC voltage, e.g. DC supply voltage with at least two different DC voltage levels
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02J 9/06 with automatic change-over , e.g. UPS systems
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

Device for supplying power to a two-voltage vehicle electrical system equipped with safety-relevant components with an integrated starter-generator mechanically coupled with an internal combustion engine BKM, a double-layer capacitor DLC, a first and second energy accumulator B1, B2, with power being able to be supplied to safety-relevant components V1s via three safety switches X1 to X3, alternately by the starter-generator ISG, the double-layer capacitor DLC, the first or the second energy accumulator B1, B2.

Claims

1-6. -6. (canceled)

7. A device for supplying energy to a two-voltage vehicle electrical system, the device comprising:

an integrated starter-generator mechanically coupled to an internal combustion engine;

a first switch;

a second switch;

a double-layer capacitor connected to said second switch;

a first accumulator connected to said first switch and supplying a first vehicle electric system and its loads with power;

a bidirectional AC/DC-converter disposed downstream of and connected to said integrated starter-generator, said bidirectional AC/DC-converter having a DC terminal connected through said first switch to said first accumulator and through said second switch to said double-layer capacitor;

a bidirectional DC/DC converter directly connected to said DC terminal of said bidirectional AC/DC converter;

a second accumulator connected to said bidirectional DC/DC converter, said second accumulator supplying a second vehicle electrical system and its loads with power;

a first safety switch through which the power is supplied to safety-relevant components by said integrated starter-generator through said bidirectional AC/DC converter or alternatively by said second accumulator though said bidirectional DC/DC converter;

a second safety switch through which the power is supplied to the safety-relevant components by said double-layer capacitor;

a third safety switch through which the power is supplied to the safety-relevant components by said first accumulator; and

a control/regulation circuit for controlling/regulating operational sequences of the device including a determination of a direction of operation of said bidirectional AC/DC-converter and said bidirectional DC/DC converter, a charging of said first and second accumulators and of said double layer capacitor and switch positions of said first and second switches and said first, second and third safety switches.

8. The device according to claim 7, wherein during normal operation, when said integrated starter-generator is operating as a generator, the power is supplied to the safety-relevant components by said first accumulator through said third safety switch.

9. The device according to claim 7, wherein upon a short circuiting of said first accumulator, said first switch and said third safety switch are made non-conducting and the power is supplied to the safety-relevant components by:

said integrated starter-generator through said AC/DC converter and said first safety switch;

said second accumulator through said DC/DC converter and said first safety switch;

or

said double-layer capacitor through said second safety switch.

10. The device according to claim 7, wherein upon a short circuiting of said double-layer capacitor, said second switch and said second safety switch are made non-conducting and the power is supplied to the safety-relevant components by:

said first accumulator through said third safety switch;

said integrated starter-generator through said AC/DC converter and said first safety switch;

or

said second accumulator through said DC/DC converter and said first safety switch.

11. The device according to claim 7, wherein upon a short circuiting at an output of said AC/DC converter, said first switch, said second switch and said first safety switch are made non-conductive and the power is supplied to safety-relevant components by:

said first accumulator through said third safety switch;

or

said double-layer capacitor through said second safety switch.

12. The device according to claim 7, wherein upon a short circuiting of said second energy accumulator, the power is supplied to the safety-relevant components by:

said first accumulator through said third safety switch;

said double-layer capacitor through said second safety switch;

or

said integrated starter-generator through said AC/DC converter and said first safety switch.