Device for measuring an electric current

Patent metadata

Field	Value
Publication number	US-10241153-B2
Application number	US-201214232417-A
Country	US
Kind code	B2
Filing date	Jul 13, 2012
Priority date	Jul 14, 2011
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

The invention relates to a device for measuring an electric current between a vehicle battery and an electrical consumer connected to the vehicle battery. The claimed device includes a bus bar which picks up the electric current in the vehicle battery and guides it further to the electrical consumer, on which a first current sensor and a second current sensor which is different from the first current sensor are arranged, the current sensors being designed to measure, independently from each other, the electric current circulating in the bus bar.

First claim

The invention claimed is:

1. A device for measuring an electric current between a vehicle battery and an electrical consumer connected to the vehicle battery, said device comprising:
a busbar, which receives the electric current from the vehicle battery and transfers it to the electrical consumer, the busbar comprising a first busbar part and a second busbar part;
a first current device arranged on the busbar;
a second current device arranged on the busbar, the second current device is a first transistor which electrically connects the first busbar part with the second busbar part; and
a third current device arranged on the busbar, the third current device is a second transistor which electrically connects the second busbar part with the first busbar part,
wherein the first, second and the third current devices are configured to measure the electric current through the busbar independently of one another,
wherein a voltage drop across the second current device and the third current device caused by the electric current, is kept constant by a control voltage that is dependent on the electric current.

2. The device as claimed in claim 1 , wherein the first current device is operated using a measuring principle which is independent of the second current device.

3. The device as claimed in claim 1 , wherein the busbar comprises a conductor loop, in which the first current device detects the current to be measured on the basis of a magnetic measuring principle.

4. The device as claimed in claim 3 , wherein the conductor loop has an electrical interruption which is bridged by the second current device.

5. The device as claimed in claim 4 , wherein the electrical interruption divides the conductor loop into two conductor-loop limbs which are electrically isolated from one another and are stacked.

6. The device as claimed in claim 5 , wherein the stacked conductor-loop limbs are connected to one another via an electrically isolating mechanical connection.

7. A vehicle battery comprising:
an electrical connection for outputting an electric current to an electrical consumer or, respectively, for receiving an electric current from an electrical energy source, and
a device for measuring an electric current between a vehicle battery and an electrical consumer connected to the vehicle battery, said device comprising:
a busbar including a first busbar part and a second busbar part, the busbar receives the electric current from the vehicle battery and transfers it to the electrical consumer and on which a first current device, a second current device and a third current device are arranged,
wherein the second current device is a first transistor which electrically connects the first busbar part with the second busbar part, and is configured to measure the electric current in only a first direction,
wherein the third current device is a second transistor which electrically connects the second busbar part with the first busbar part, and is configured to measure the electric current in only a second direction that is opposite the first direction,
wherein the first, second and the third current devices are configured to measure the electric current through the busbar independently of one another, and
wherein a voltage drop across the second current device and the third current device caused by the electric current, is kept constant by a control voltage that is dependent on the electric current.

8. A method for detecting a measured value for an electric current between a vehicle battery and an electrical consumer connected to the vehicle battery through a busbar having a first busbar part and a second busbar part, said method comprising:
detecting a first value for the electric current using a first current device;
detecting a second value and a third value for the electric current using a second current device and a third current device respectively,
wherein the second current device is a first transistor which electrically connects the first busbar part with the second busbar part, and is configured to measure the electric current in only a first direction,
wherein the third current device is a second transistor which electrically connects the second busbar part with the first busbar part, and is configured to measure the electric current in only a second direction that is opposite the first direction,
wherein the first, second and the third current devices are configured to measure the electric current through the busbar independently of one another, and
wherein a voltage drop across the second current device and the third current device caused by the electric current, is kept constant by a control voltage that is dependent on the electric current; and
determining the measured value for the electric current on the basis of the first, second and third value.

9. A control device, which is designed to perform a method for detecting a measured value for an electric current between a vehicle battery and an electrical consumer connected to the vehicle battery through a busbar having a first busbar part and a second busbar part, said method comprising:
detecting a first value for the electric current using a first current device;
detecting a second value and a third value for the electric current using a second current device and a third current device respectively,
wherein the second current device is a first transistor which electrically connects the first busbar part with the second busbar part, and is configured to measure the electric current in only a first direction,
wherein the third current device is a second transistor which electrically connects the second busbar part with the first busbar part, and is configured to measure the electric current in only a second direction that is opposite the first direction,
wherein the first, second and the third current devices are configured to measure the electric current through the busbar independently of one another, and
wherein a voltage drop across the second current device and the third current device caused by the electric current, is kept constant by a control voltage that is dependent on the electric current; and
determining the measured value for the electric current on the basis of the first, second and third value.

Assignees

• Rink Klaus
• Joeckel Wolfgang
• Continental Teves Ag & Co Ohg

Inventors

• Rink Klaus
• Jöckel Wolfgang

Classifications

• H10W72/5475

  multiple bond wires connected to common bond pads at both ends of the wires · CPC title

• H10W72/5445

  being orthogonal to a side surface of the chip, e.g. parallel arrangements · CPC title

• H01L2224/48091

  Electricity · mapped topic

• H01L2224/49111

  Electricity · mapped topic

• G01R15/205

  using magneto-resistance devices, e.g. field plates · CPC title