Device for supplying power to a two-voltage vehicle electrical system equipped with safety-relevant components

• US 7,436,080 B2
• Filed: 01/14/2004
• Issued: 10/14/2008
• Est. Priority Date: 02/10/2003
• Status: Expired due to Fees

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Siemens AG
• Inventors: Knorr, Rainer, Lugert, Gunter, Hackl, Stefan
• Primary Examiner(s): Ponomarenko; Nicholas
• Application Number:
  US10/545,011
• Publication Number:
  US 20060145536A1
• Time in Patent Office: 1,735 Days
• Field of Search: 290/40.R, 290/40.C, 290/40.B, 322/10, 322/16
• US Class Current: 290/40.00C
• 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. Device for supplying energy to a two-voltage vehicle electrical system

with an integrated starter-generator (ISG) mechanically coupled to an internal combustion engine (BKM), downstream from which is connected a bidirectional AC/DC-converter, of which the DC terminal

is connected via first switch (S1) to a first accumulator (B1) which supplies a first vehicle electric system and its loads (V1) with power, and

is connected via a second switch (S2) to a double-layer capacitor (DLC),

is connected to a bidirectional DC/DC converter (2), downstream from which a second accumulator (B2) is connected, which supplies a second vehicle electrical system and its loads (v2) with power, and

with a control/regulation circuit, which controls/regulates the operational sequences of this device—

the determination of the direction of operation of the converters(1, 2), the charging of the sources of energy (B1, B2, DLC) and the switch positions of all switches,

characterized in that the bidirectional DC/DC converter (2) is directly connected to the DC terminal of the bidirectional AC/DC converter (1), a first safety switch (X1) is provided, via which power is supplied to safety relevant components (V1s) by the integrated starter-generator (ISG) via the bidirectional AC/DC converter (1) or alternatively by the second accumulator (B2) via the bidirectional DC/DC converter (2),

a second safety switch (X2) is provided, via which power is supplied to safety-relevant components (V1s) by the double-layer capacitor (DLC), and a third safety switch (X3) is provided, via which power is supplied to safety-relevant components (V1s) by the first accumulator (B1).

2. Device in accordance with claim 1, characterized in that, in normal operation, i.e., when the integrated starter-generator (ISG) is operating as a generator, power is supplied to safety-relevant components (V1s) by the first accumulator (B1) via the third safety switch (X3).

3. Device in accordance with claim 1, characterized in that, with a short circuit of the first accumulator (B1) the first switch (S1) and the third safety switch (X3) are made non-conducting and power is supplied to safety-relevant components (V1s)

a) by the integrated starter-generator ISG via the Ac/DC converter 1 and the first safety switch X1, or

b) by the second accumulator (B2) via the DC/DC converter (2) and the first safety switch (X1), or

c) by the double-layer capacitor (DLC) via the second safety switch (X2).

4. Device in accordance with claim 1, characterized in that, with a short circuit of the double-layer capacitor (DLC) the second switch (S2) and the second safety switch (X2) are made non-conducting and power is supplied to safety-relevant components (V1s)

a) by the first accumulator (B1) via the third safety switch (X3), or

c) by the integrated starter-generator ISG via the AC/DC converter 1 and the first safety switch X1), or

c) by the second accumulator B2 via the DC/DC converter 2 and the first safety switch (X1).

5. Device in accordance with claim 1, characterized in that, with a short circuit at the output of the AC/DC converter (1) the first switch (S1), the second switch (S2) and the first safety switch (X1) are made non-conductive and power is supplied to safety-relevant components (V1s)

a) be supplied by the first accumulator B1 via the third safety switch X3, or

b) by the double layer capacitor DLC via the second safety switch X2.

6. Device in accordance with claim 1, characterized in that, with a short circuit of the second energy accumulator (B2), power is supplied to the safety-relevant components V1s

a) be supplied by the first accumulator B1 via the third safety switch X3, or

b) by the double-layer capacitor DLC via the second safety switch X2, or

c) by the integrated starter-generator ISG via the AC/DC converter 1 and the first safety switch X1.

7. Device in accordance with claim 1, characterized in that it is provided for supplying power to a two-voltage electrical system in a vehicle.