Magnetic field detection device and method for detecting a magnetic field

Patent metadata

Field	Value
Publication number	US-9500723-B2
Application number	US-201314051858-A
Country	US
Kind code	B2
Filing date	Oct 11, 2013
Priority date	Oct 12, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A magnetic field detection device and a corresponding method for detecting a magnetic field. The magnetic field detection device includes a coil core, a receiving coil coupled to the coil core, a plurality of electrically separated field coils coupled to the coil core, an excitation unit for generating a magnetic field excitation via a particular excitation current of the plurality of field coils coupled to the coil core and an evaluation unit for evaluating a magnetic field signal received via a receiving coil coupled to the coil core.

First claim

What is claimed is:

1. A magnetic field detection device, comprising:
a coil core;
a receiving coil directly coupled to the coil core;
a plurality of electrically separated field coils directly coupled to the coil core;
an excitation unit for generating a magnetic field excitation via a particular excitation current of the plurality of field coils directly coupled to the coil core; and
an evaluation unit for evaluating a magnetic field signal received via the receiving coil directly coupled to coil core.

2. The magnetic field detection device as recited in claim 1 , wherein the excitation unit selectively generates the magnetic field excitation via a subgroup of the plurality of field coils directly coupled to the coil core.

3. The magnetic field detection device as recited in claim 1 , wherein:
the excitation unit includes a control circuit unit and a plurality of coupling circuits, each of which is electrically connected to the control circuit unit, and
each coupling circuit is electrically connected to an associated field coil.

4. The magnetic field detection device as recited in claim 3 , wherein each of the coupling circuits includes a driver device for driving a particular field coil current responsive to a particular control signal of the control circuit unit.

5. The magnetic field detection device as recited in claim 4 , wherein each of the driver devices includes a transistor device connected between a first and a second reference potential.

6. The magnetic field detection device as recited in claim 5 , wherein the control signals are routed in parallel from the control circuit unit to control terminals of the transistor devices.

7. The magnetic field detection device as recited in claim 6 , further comprising:
a plurality of switching elements connected upstream from the control terminals of the transistor devices, wherein the control signals are routed in parallel from the control circuit unit to the switching elements, and wherein a common control signal is routed from the control circuit unit to the switching elements.

8. The magnetic field detection device as recited in claim 1 , wherein the evaluation unit determines at least one of a magnetic field strength and a magnetic field direction on the basis of the evaluated magnetic field signal.

9. The magnetic field detection device as recited in claim 1 , wherein all excitation currents are essentially identical.

10. The magnetic field detection device as recited in claim 1 , wherein all field coils exhibit essentially the same coil resistance.

11. The magnetic field detection device as recited in claim 1 , wherein the excitation unit is battery-powered.

12. A magnetic field detection method, comprising:
generating a magnetic field excitation via a particular excitation current of a plurality of electrically separated field coils directly coupled to a coil core; and
evaluating a magnetic field signal received via a receiving coil directly coupled to the coil core.

Assignees

• Bosch Gmbh Robert

Inventors

• Sinanoglu Tamer
• Jemili Amin

Classifications

• G01R33/04 Primary

  using the flux-gate principle · CPC title

• G01R33/0052

  Manufacturing aspects; Manufacturing of single devices, i.e. of semiconductor magnetic sensor chips (devices based on galvano-magnetic effect or the like H10N50/85) · CPC title

• G01R33/096

  anisotropic magnetoresistance sensors · CPC title

• G01R33/0206

  Three-component magnetometers · CPC title

• G01R33/02 Primary

  Measuring direction or magnitude of magnetic fields or magnetic flux (G01R33/20 takes precedence) · CPC title