Current Measuring Circuit, Battery and Motor Vehicle

• US 20180284163A1
• Filed: 06/05/2018
• Published: 10/04/2018
• Est. Priority Date: 12/16/2011
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Original Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Inventors: Kaupp, Patrick
• Granted Patent: US 10,670,637 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 1/203 Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts resistors in general H01C; microwave or radiowave terminations H01P1/26; coupling devices H01R
• CPC Class Codes: G01R 15/20 using galvano-magnetic devices, e.g. Hall-effect devices , i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
• CPC Class Codes: G01R 19/00 Arrangements for measuring currents or voltages or for indicating presence or sign thereof G01R5/00 takes precedence; for measuring bioelectric currents or voltages A61B5/24
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 33/07 Hall effect devices

Abstract

A current measuring circuit for redundantly measuring electrical current includes a measuring resistor, a magnetic field sensor, and an evaluation circuit on an evaluation circuit board. The evaluation circuit is used to determine electrical current using the measuring resistor. The magnetic field sensor on the evaluation circuit board and the evaluation circuit board are arranged in direct proximity to the measuring resistor such that the magnetic field sensor is configured to detect the magnetic field from the current-carrying resistor. A battery includes the current measuring circuit and a motor vehicle includes the battery.

Claims

1. A current-measuring circuit for redundantly measuring an electric current, comprising:

a measuring resistor, a magnetic-field sensor, and an evaluation circuit on an evaluation-circuit printed circuit board configured to determine the electric current using the measuring resistor,

wherein the magnetic-field sensor on the evaluation-circuit printed circuit board and the evaluation-circuit printed circuit board are arranged in the immediate vicinity of the measuring resistor such that the magnetic-field sensor is configured to detect the magnetic field of the measuring resistor when current flows through it.

2. The current-measuring circuit as claimed in claim 1, wherein the evaluation circuit is further configured to compare a primary signal corresponding to the current determined by the measuring resistor with a secondary signal corresponding to the current determined by the magnetic-field sensor and to output an error signal in the event that the two signals differ.

3. The current-measuring circuit as claimed in claim 1, wherein the normal distance between the magnetic-field sensor and the measuring resistor is less than 10 mm.

4. The current-measuring circuit as claimed in claim 3, wherein the normal distance between the magnetic-field sensor and the measuring resistor is less than or equal to 5 mm.

5. The current-measuring circuit as claimed in claim 1, wherein the evaluation-circuit printed circuit board having the magnetic-field sensor lies flat against the measuring resistor.

6. The current-measuring circuit as claimed in claim 1, wherein the measuring resistor has an electrical resistance of less than 1 mΩ

.

7. The current-measuring circuit as claimed in claim 1, wherein the magnetic-field sensor is a Hall sensor.

8. A battery, comprising:

a current-measuring circuit configured to redundantly measure an electrical current, the current-measuring circuit including;

a measuring resistor, a magnetic-field sensor, and an evaluation circuit on an evaluation-circuit printed circuit board configured to determine the electric current using the measuring resistor,

wherein the magnetic-field sensor on the evaluation-circuit printed circuit board and the evaluation-circuit printed circuit board are arranged in the immediate vicinity of the measuring resistor such that the magnetic-field sensor is configured to detect the magnetic field of the measuring resistor when current flows through it.

9. The battery as claimed in claim 8, wherein the battery is a lithium-ion battery.

10. A motor vehicle or electrical device, comprising:

a battery including a current-measuring circuit configured to redundantly measure an electrical current, the current-measuring circuit including;

a measuring resistor, a magnetic-field sensor, and an evaluation circuit on an evaluation-circuit printed circuit board configured to determine the electric current using the measuring resistor,

wherein the magnetic-field sensor on the evaluation-circuit printed circuit board and the evaluation-circuit printed circuit board are arranged in the immediate vicinity of the measuring resistor such that the magnetic-field sensor is configured to detect the magnetic field of the measuring resistor when current flows through it.