APPARATUS AND METHOD FOR CONNECTING MULTIPLE-VOLTAGE ONBAORD POWER SUPPLY SYSTEMS

• US 20140117925A1
• Filed: 05/23/2012
• Published: 05/01/2014
• Est. Priority Date: 06/17/2011
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Pischke, Ulf, Draese, Nils, Walenta, Sebastian
• Application Number:
  US14/126,827
• Publication Number:
  US 20140117925A1
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: H02J 1/10 Parallel operation of dc sources
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

An apparatus and a method are proposed for connecting multiple-voltage onboard power supply systems, wherein the apparatus comprises at least one DC/DC voltage converter (10) which can couple a first onboard power supply system (12) having a first onboard power supply system voltage (U1) to a second onboard power supply system (14) having a second onboard power supply system voltage (U2), wherein besides the DC/DC voltage converter (10) at least one charging means (18) is provided for increasing the second onboard power supply system voltage (U2).

Claims

1. An apparatus for connecting multiple-voltage onboard power supply systems, comprising at least one DC-DC converter (10) configured to connect a first onboard power supply system (12) having a first onboard power supply system voltage (U1) to a second onboard power supply system (14) having a second onboard power supply system voltage (U2), characterized in that at least one charger (18) is provided for increasing the second onboard power supply system voltage (U2) before connecting an energy storage (38) for supplying the second onboard power supply system (14).

2. The apparatus as claimed in claim 1, characterized in that the charger (18) increases the second onboard power supply system voltage (U2) by charging an intermediate circuit capacitance (20) that is present in the second onboard power supply system (14).

3. The apparatus as claimed in claim 1, characterized in that the charger (18) increases the second onboard power supply system voltage (U2) at least to an intermediate voltage (Uz), at which time the DC-DC converter (10) is connected for further increasing the voltage of the second onboard power supply system voltage (U2).

4. The apparatus as claimed in claim 1, characterized in that at least one protective element (21) is arranged between the DC-DC converter (10) and the second onboard power supply system (14).

5. The apparatus as claimed in claim 1, characterized in that the charger (18) at least partially supplies a charging current (Ik) to the second onboard power supply system (14) via the protective element (21).

6. The apparatus as claimed in claim 1, characterized in that the protective element (21) is closed if the second onboard power supply system voltage (U2) approximately reaches the voltage (U_HS) at the output (HS) of the DC-DC converter (10), which can be connected to the second onboard power supply system (14).

7. The apparatus as claimed in claim 1, characterized in that a switch (30) is provided via which an energy storage (38) connected to the second onboard power supply system (14) if the second onboard power supply system voltage (U2) approximately corresponds to an open-circuit voltage (Ub) of the energy storage (38).

16. The apparatus as claimed in claim 4, wherein the at least one protective element (21) is two semiconductor switches that are connected inversely parallel to each other.

8. A method for connecting multiple-voltage onboard power supply systems, comprising at least one DC-DC converter (10) that is configured to connect a first onboard power supply system (12) having a first onboard power supply system voltage (U1) to a second onboard power supply system (14) having a second onboard power supply system voltage (U2), characterized in that at least one charger (18) increases the second onboard power supply system voltage (U2) before connecting an energy storage (38) for supplying the second onboard power supply system (14).

9. The method as claimed in claim 8, characterized in that the charger (18) charges an intermediate circuit capacitance (20) that is present in the second onboard power supply system (14) in order to increase the second onboard power supply system voltage (U2).

10. The method as claimed in claim 8, characterized in that the second onboard power supply system voltage (U2), upon reaching an intermediate voltage (Uz) that is larger than the first onboard power supply system voltage (U1), continues to be increased via the DC-DC converter (10) and the charger (18).

11. The method as claimed in claim 8, characterized in that the charger (18) increases the second onboard power supply system voltage (U2) to a specified voltage (Ut), at which time at least one consumer (34) connected to the second onboard power supply system (14).

12. The method as claimed in claim 8, characterized in that at least one protective element (21) located between the second onboard power supply system (14) and the DC-DC converter (10) is activated if a voltage (U_HS) at an output (HS) of the DC-DC converter (10), that can be connected to the second onboard power supply system (14), corresponds approximately to the second onboard power supply system voltage (U2).

13. The method as claimed in claim 8, characterized in that the charger (18) is deactivated if a voltage (U_HS) at an output (HS) of the DC-DC converter (10), that can be connected to the second onboard power supply system (14), corresponds approximately to the second onboard power supply system voltage (U2).

14. The method as claimed in claim 8, characterized in that the second onboard power supply system voltage (U2) is increased to an open-circuit voltage (Ub) of an energy storage (38), that can be connected to the second onboard power supply system (14), via the DC-DC converter (10) and the charger (18).

15. The method as claimed in claim 8, characterized in that the energy storage (38) is connected to the second onboard power supply system (14) if the second onboard power supply system voltage (U2) corresponds approximately to the open-circuit voltage (Ub) of the energy storage (38).

17. The method as claimed in claim 8, characterized in that the second onboard power supply system voltage (U2), upon reaching an intermediate voltage (Uz) that is larger than the first onboard power supply system voltage (U1), continues to be increased via the DC-DC converter (10).

18. The method as claimed in claim 8, characterized in that the second onboard power supply system voltage (U2), upon reaching an intermediate voltage (Uz) that is larger than the first onboard power supply system voltage (U1), continues to be increased via the charger (18).

19. The method as claimed in claim 8, characterized in that the charger (18) increases the second onboard power supply system voltage (U2) to a specified voltage (Ut), at which time the second onboard power supply system (14) is checked for proper operation.

20. The method as claimed in claim 8, characterized in that the second onboard power supply system voltage (U2) is increased to an open-circuit voltage (Ub) of an energy storage (38), that can be connected to the second onboard power supply system (14), via the DC-DC converter (10).

21. The method as claimed in claim 8, characterized in that the second onboard power supply system voltage (U2) is increased to an open-circuit voltage (Ub) of an energy storage (38), that can be connected to the second onboard power supply system (14), via the charger (18).