Side-biased current sensor with improved dynamic range
AssigneeInfineon Technologies AG
InventorsKlaus Elian, Rainer Markus Schaller
Life of this patent
Estimating the term…
Abstract
A semiconductor package may include a sensor chip to measure an amount of electrical current in a current medium. The sensor chip may include a first magnetic sensing element and a second magnetic sensing element. The semiconductor package may include a magnet that produces a magnetic field. The magnet may be arranged asymmetrically with respect to the first magnetic sensing element and the second magnetic sensing element such that a strength of the magnetic field at the first magnetic sensing element is different from a strength of the magnetic field at the second magnetic sensing element.
Claims20
A semiconductor package, comprising:
- a sensor chip to measure an amount of electrical current in a current medium,
- the sensor chip including a first magnetic sensing element and a second magnetic sensing element;
- a magnet that produces a magnetic field,
- wherein the magnet is arranged asymmetrically with respect to the first magnetic sensing element and the second magnetic sensing element such that a strength of the magnetic field at the first magnetic sensing element is different from a strength of the magnetic field at the second magnetic sensing element;
- a fixation feature associated with positioning the current medium,
- wherein the fixation feature includes a hole or an opening in a material of the semiconductor package,
- wherein the fixation feature is arranged in the semiconductor package such that the current medium runs through a length of the hole or the opening in a first direction parallel to a first axis, and
- wherein an entirety of the sensor chip is arranged between the magnet and the fixation feature in a second direction parallel to a second axis,
- the second axis being perpendicular to the first axis;
- and
- a carrier including a substrate,
- wherein the magnet is directly attached to the substrate,
- wherein the sensor chip is directly attached to the substrate,
- wherein the entirety of the sensor chip is arranged on a plane of the substrate, and
- wherein the plane of the substrate is parallel to a plane defined by the first direction and the second direction.
A current sensor package, comprising:
- a sensor chip including a first magnetic sensing element and a second magnetic sensing element;
- a magnet that produces a magnetic field,
- wherein the magnet is arranged at a first distance from the first magnetic sensing element, and
- wherein the magnet is arranged at a second distance from the second magnetic sensing element,
- wherein the first distance is different from the second distance such that a strength of the magnetic field at the first magnetic sensing element is different from a strength of the magnetic field at the second magnetic sensing element;
- a fixation feature associated with positioning a current medium,
- wherein the fixation feature includes a hole or an opening in a material of the current sensor package,
- wherein the fixation feature is arranged in the current sensor package such that the current medium runs through a length of the hole or the opening in a first direction parallel to a first axis, and
- wherein an entirety of the sensor chip is arranged between the magnet and the fixation feature in a second direction parallel to a second axis,
- the second axis being perpendicular to the first axis;
- and
- a carrier including a substrate,
- wherein the magnet is directly attached to the substrate,
- wherein the sensor chip is directly attached to the substrate, and
- wherein the entirety of the sensor chip is arranged on a plane of the substrate, and
- wherein the plane of the substrate is parallel to a plane defined by the first direction and the second direction.
A sensor package, comprising:
- a sensor chip to measure an amount of electrical current in a current medium based on a magnetic field generated by the electrical current,
- the sensor chip including at least two magnetic sensing elements;
- a magnet that produces a bias magnetic field,
- wherein the magnet is arranged such that the magnet asymmetrically biases the at least two magnetic sensing elements;
- a fixation feature associated with positioning the current medium,
- wherein the fixation feature includes a hole or an opening in a material of the sensor package,
- wherein the fixation feature is arranged in the sensor package such that the current medium runs through a length of the hole or the opening in a first direction parallel to a first axis, and
- wherein an entirety of the magnet is arranged between the sensor chip and the fixation feature in a second direction parallel to a second axis,
- the second axis being perpendicular to the first axis;
- and
- a carrier including a substrate,
- wherein the magnet is directly attached to the substrate,
- wherein the sensor chip is directly attached to the substrate, and
- wherein an entirety of the sensor chip is arranged on a plane of the substrate, and
- wherein the plane of the substrate is parallel to a plane defined by the first direction and the second direction.
Dependencies are inferred from the claim text.