Magnetic field sensing apparatus

A magnetic field sensing apparatus, comprising:

• a magnetic flux concentrator, having a top surface, a bottom surface opposite to the top surface, and four side surfaces connecting the top surface and the bottom surface;
• at least four magnetoresistance units, respectively disposed beside the four side surfaces, wherein the at least four magnetoresistance units are electrically connected to form an unchangeable Wheatstone full bridge;
• and
• a plurality of magnetization direction setting elements respectively disposed beside the at least four magnetoresistance units so as to set magnetization directions of the at least four magnetoresistance units, respectively, wherein the magnetization direction setting elements set the magnetization directions of the at least four magnetoresistance units in a configuration that enables the unchangeable Wheatstone full bridge to measure a magnetic field components in a direction perpendicular to the top surface and to output a signal corresponding to the magnetic field component in the direction perpendicular to the top surface.

A magnetic field sensing apparatus, comprising:

• a magnetic flux concentrator, having a top surface, a bottom surface opposite to the top surface, and a plurality of side surfaces connecting the top surface and the bottom surface;
• a plurality of magnetoresistance units, respectively disposed beside the side surfaces, wherein the magnetoresistance units are electrically connected to form an unchangeable Wheatstone full bridge;
• and
• a plurality of magnetization direction setting elements respectively disposed beside the magnetoresistance units so as to set magnetization directions of the magnetoresistance units, respectively, wherein the magnetization direction setting elements set the magnetization directions of the magnetoresistance units into two different combinations in two different periods, respectively, so as to enable the unchangeable Wheatstone full bridge to respectively measure the magnetic field components in the two different directions in the two different periods and to respectively output two signals corresponding to the magnetic field components in the two different directions.

A magnetic field sensing apparatus, comprising:

• a magnetic flux concentrator, having a top surface, a bottom surface opposite to the top surface, and four side surfaces connecting the top surface and the bottom surface;
• at least four magnetoresistance units, respectively disposed beside the four side surfaces, wherein the at least four magnetoresistance units are electrically connected into two different combinations to form two kinds of Wheatstone full bridges in two different periods, respectively, so as to measure magnetic field components in two different directions and to cause the two kinds of the Wheatstone full bridges to respectively output two signals corresponding to the magnetic field components in the two different directions, wherein in any one of the two different periods, the number of the Wheatstone full bridge formed by electrically connecting the at least four magnetoresistance units is one;
• and
• a switching circuit, electrically connected to the at least four magnetoresistance units, wherein the switching circuit electrically connects the at least four magnetoresistance units into the two different combinations to form the two kinds of Wheatstone full bridges, respectively, and the two kinds of Wheatstone full bridges respectively measure the magnetic field components at the two different directions and respectively output the two signals corresponding to the magnetic field components in the two different directions.