Device for power supply in a multi-voltage electric system of a motor vehicle

• US 20030155814A1
• Filed: 03/24/2003
• Published: 08/21/2003
• Est. Priority Date: 04/24/2001
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Gronbach, Roman
• Application Number:
  US10/312,204
• Publication Number:
  US 20030155814A1
• Time in Patent Office: Days
• US Class Current: 307/130
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• 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 2310/46 for ICE-powered road vehicles
• CPC Class Codes: H02J 7/0034 using reverse polarity correcting or protecting circuits mechanical means of polarity protection H02J7/0045
• CPC Class Codes: H02M 1/08 Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• CPC Class Codes: H02P 2101/45 for motor vehicles, e.g. car alternators
• CPC Class Codes: H02P 9/307 more than one voltage output
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

The invention relates to a power supply device of a dual voltage electric system of a motor vehicle. According to the invention, a dual voltage electric system of a motor vehicle is provided, that supplies a first and a second voltage level which differ from the reference voltage, wherein power is supplied from at least one electric energy accumulator (12, 24). At least one transformer for transforming both voltage levels (18, 28) is also provided. Supply means (34, 31, 32, 36, 20) are further provided for additional supply of the energy accumulator (12, 24).

Claims

1. A device for supplying power to a multi-voltage on-board electrical system of a motor vehicle, comprising a multi-voltage on-board electrical system, which is situated in a motor vehicle, provides at least a first and a second voltage level (18, 28) that are both different from the reference potential, and is powered by at least one electrical energy store (12, 24);

and at least one converter (20, 22) for connecting the two voltage levels (18, 28);

wherein supply means (20, 31, 32, 34, 36) are provided for externally supplying power to the multi-voltage on-board electrical system.

2. The device as recited in claim 1,

wherein the supply means (20, 31, 32, 34, 36) include at least one switching element (32, 36), across which an external support point for charging (34) is electroconductively connectible to the multi-voltage on-board electrical system.

3. The device as recited in one of the preceding claims,

wherein the external charging support point (34) is connectible to the second voltage level (28) via the converter (20).

4. The device as recited in one of the preceding claims,

wherein the supply means (20, 31, 32, 34, 36) disconnect at least one converter (20) from a voltage level (18) of the multi-voltage on-board electrical system, in order to use this terminal as an external charging support point (34) for externally supplying power.

5. The device as recited in one of the preceding claims,

wherein at least one switching element (31, 36) is provided, in order to disconnect the converter (20) from the first voltage level (18).

6. The device as recited in one of the preceding claims,

wherein, when power is externally supplied, the converter (20) is disconnected from the first voltage level (18).

7. The device as recited in one of the preceding claims,

wherein at least two parallelly connected converters (20, 22) are provided.

8. The device as recited in one of the preceding claims,

wherein at least one multiphase converter is provided as a converter (20, 22).

9. The device as recited in one of the preceding claims,

wherein the switching elements (31, 32, 36) are controlled as a function of a switching-element signal generated in connection with a cable being plugged into the external charging support point (34).

10. The device as recited in one of the preceding claims,

wherein means for protecting against polarity reversal (20, 38) are provided.

11. The device as recited in one of the preceding claims,

wherein the converter (20, 22) may be operated in a current-controlled and/or voltage-controlled manner.

12. The device as recited in one of the preceding claims,

wherein the converter (22) may be controlled in step-up operation and in step-down operation.

13. The device as recited in one of the preceding claims,

wherein the converter (22) is controlled in step-down mode during normal operation, and controlled in step-up mode during charging operation.

14. The device as recited in one of the preceding claims,

wherein a cigarette lighter is used as an external charging support point (34).

15. The device as recited in one of the preceding claims,

wherein the external charging support point (34) is provided for extracting power from the multi-voltage on-board electrical system.