Method and system for operating a DC-DC converter of an electrical system to distribute a load

Patent metadata

Field	Value
Publication number	US-10840729-B2
Application number	US-201615746984-A
Country	US
Kind code	B2
Filing date	Jun 14, 2016
Priority date	Jul 28, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

The invention relates to a method for operating an electrical system (1) having a high-voltage section (2) and a low-voltage section (3) which are electrically connected to one another by means of a DC-DC converter (4), wherein the low-voltage section (3) has at least one rechargeable energy store (8) and at least one electrical consumer (9), wherein the DC-DC converter (4) is operated on the basis of an electrical load (P) acting on the low-voltage section (3). In order to determine the load (P), provision is made for all currents flowing through the DC-DC converter (4) to be recorded and added to one another.

First claim

The invention claimed is:

1. A method for operating a DC-DC voltage converter ( 4 ) of a motor vehicle electrical system ( 1 ), the motor vehicle electrical system including a high-voltage section ( 2 ) and a low-voltage section ( 3 ) that are electrically connected to one another by the DC-DC voltage converter ( 4 ), wherein the low-voltage section ( 3 ) has at least one rechargeable energy store ( 8 ) and at least one electrical consumer ( 9 ), wherein the DC-DC voltage converter ( 4 ) is operated on the basis of an electrical load (P) acting on the low-voltage section ( 3 ), characterized in that the load (P) is determined by virtue of all the currents flowing through the DC-DC voltage converter ( 4 ) being sensed and added to one another, a peak load (P S ) of the load (P) is forecast from a gradient of the added currents being ascertained and a present base load (P G ), and the peak load (P S ) is compared with a prescribable limit value in order to initiate measures to avoid the peak load (P S ) in the event of the limit value being exceeded, and wherein when a critical peak load is sensed, one or more additional DC-DC voltage converter modules are connected distributing the peak load over all of the DC-DC voltage converter modules.

2. The method as claimed in claim 1 , characterized in that the base load (P G ) of the load (P) is determined by virtue of an output voltage of the DC-DC voltage converter ( 4 ) being sensed.

3. The method as claimed in claim 1 , characterized in that an alternating load (P W ) of the load (P) is determined by virtue of voltage changes in the low-voltage section ( 3 ) being monitored.

4. The method as claimed in claim 1 , characterized in that the DC-DC voltage converter ( 4 ) operated is a multiphase converter ( 4 ) having multiple parallel-connected DC-DC voltage converter modules ( 4 _ 1 , 4 _ 2 , . . . , 4 _N).

5. An apparatus for operating a DC-DC voltage converter ( 4 ) of a motor vehicle electrical system ( 1 ), the motor vehicle electrical system including a high-voltage section ( 2 ) and a low-voltage section ( 3 ) that are electrically connected to one another by the DC-DC voltage converter ( 4 ), wherein the low-voltage section ( 3 ) has at least one rechargeable energy store ( 8 ) and at least one electrical consumer ( 9 ), having a controller that takes an electrical load acting on the low-voltage section as a basis for actuating the DC-DC voltage converter ( 4 ), characterized in that the controller is set up to operate the DC-DC voltage converter ( 4 ) on the basis of an electrical load (P) acting on the low-voltage section ( 3 ), wherein the load (P) is determined by virtue of all the currents flowing through the DC-DC voltage converter ( 4 ) being sensed and added to one another, a peak load (P S ) of the load (P) is forecast from a gradient of the added currents being ascertained and a present base load (P G ), and the peak load (P S ) is compared with a prescribable limit value in order to initiate measures to avoid the peak load (P S ) in the event of the limit value being exceeded, and wherein when a critical peak load is sensed, one or more additional DC-DC voltage converter modules are connected distributing the peak load over all of the DC-DC voltage converter modules.

6. The apparatus for operating an electrical system ( 1 ) as claimed in claim 5 , characterized in that the base load (P G ) of the load (P) is determined by virtue of an output voltage of the DC-DC voltage converter ( 4 ) being sensed.

7. The apparatus for operating an electrical system ( 1 ) as claimed in claim 5 , characterized in that the peak load (P S ) is compared with a prescribable limit value in order to initiate measures to avoid the peak load (P S ) in the event of the limit value being exceeded.

8. The apparatus for operating an electrical system ( 1 ) as claimed in claim 5 , characterized in that an alternating load (P W ) of the load (P) is determined by virtue of voltage changes in the low-voltage section ( 3 ) being monitored.

9. The apparatus for operating an electrical system ( 1 ) as claimed in claim 5 , characterized in that the DC-DC voltage converter ( 4 ) operated is a multiphase converter ( 4 ) having multiple parallel-connected DC-DC voltage converter modules ( 4 _ 1 , 4 _ 2 , . . . , 4 _N).

Assignees

• Bosch Gmbh Robert

Inventors

• Haefele Frank
• Esteghlal Gholamabas
• Kretschmer Markus

Classifications

• H02J2105/33

  exchanging power with road vehicles · CPC title

• H02M1/0009

  Devices or circuits for detecting current in a converter · CPC title

• H02M1/0019

  the disturbance parameters being load current fluctuations · CPC title

• B60L2260/54

  Energy consumption estimation · CPC title

• B60R16/03

  for supply of electrical power to vehicle subsystems {or for (circuit arrangements for charging batteries H02J7/00)} · CPC title