US 9,179,066 B1 · Temperature compensation for sensors

Abstract

In some embodiments, a plurality of expected values of a drive current corresponding to respective ones of a plurality of potential values of a Hall sensor output is determined. An actual value of the Hall sensor output is measured. An actual value of the drive current is measured. A potential value of the Hall sensor output corresponding to the actual value of the Hall sensor output is selected. The expected value of the drive current associated with the selected potential value of the Hall sensor output is compared to the actual value of the drive current. A value of the drive current is adjusted to reduce a difference between the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current.

Claims20

Dependent claims

A method, the method comprising:

determining a plurality of expected values of a drive current corresponding to respective ones of a plurality of potential values of a Hall sensor output;
measuring an actual value of the Hall sensor output;
measuring an actual value of the drive current;
selecting a potential value of the Hall sensor output corresponding to the actual value of the Hall sensor output;
comparing the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current;
and
adjusting a value of the drive current to reduce a difference between the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current.

4 more elements

A non-transitory computer-readable storage medium storing program instructions, wherein the program instructions are computer-executable to implement:

determining a plurality of expected values of a drive current corresponding to respective ones of a plurality of potential values of a Hall sensor output;
measuring an actual value of the Hall sensor output;
measuring an actual value of the drive current;
selecting a potential value of the Hall sensor output corresponding to the actual value of the Hall sensor output;
comparing the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current;
and
adjusting a value of the drive current to reduce a difference between the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current.

4 more elements

An apparatus for controlling the motion of a camera component, the apparatus comprising:

an actuator module comprising a plurality of magnets;
sensors for measuring a magnetic field;
one or more processors;
and
one or more memories storing instructions executable on the one or more processors to perform:
determining a plurality of expected values of a drive current corresponding to respective ones of a plurality of potential values of a Hall sensor output,
measuring an actual value of the Hall sensor output,
measuring an actual value of the drive current,
selecting a potential value of the Hall sensor output corresponding to the actual value of the Hall sensor output,
comparing the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current, and
adjusting a value of the drive current to reduce a difference between the expected value of the drive current associated with the selected potential value of the Hall sensor output to the actual value of the drive current.

8 more elements

Dependencies are inferred from the claim text.

Temperature compensation for sensors

Life of this patent

Temperature compensation for sensors

Life of this patent

Abstract

Claims20