Position sensing system, method for acquiring position sensing signal, and electronic device

A method for acquiring a position sensing signal, wherein the method is applicable to a position sensing system comprising a first position sensing element and at least one second position sensing element, and the method for acquiring a position sensing signal comprises:

• acquiring a first position sensing signal outputted by the first position sensing element in response to a predetermined signal;
• acquiring a second position sensing signal outputted by the at least one second position sensing element in response to the predetermined signal;
• and
• correcting the second position sensing signal outputted by the at least one second position sensing element based on the first position sensing signal, and determining a target sensing signal based on at least one corrected second position sensing signal;
• wherein the correcting the second position sensing signal outputted by the at least one second position sensing element based on the first position sensing signal comprises:
• substituting the first position sensing signal in a following first predetermined equation to calculate the corrected second position sensing signal:
• V
• ⁢
• 2
• =
• V
• ⁢
• OUT
• *
• A
• ⁢
• 2
• ×
• B
• ⁢
• 2
• A
• ⁢
• 1
• ×
• B
• ⁢
• 1
• .
• where V2 represents the corrected second position sensing signal, VOUT represents the first position sensing signal having a predetermined constant amplitude, A2 represents an amplification factor of a signal processing module for the second position sensing signal outputted by the at least one second position sensing element, A1 represents an amplification factor of the signal processing module for the first position sensing signal outputted by the first position sensing element, B2 represents a magnetic field intensity at the at least one second position sensing element, and B1 represents a magnetic field intensity at the first position sensing element,
• wherein the correcting the second position sensing signal outputted by the at least one second position sensing element based on the first position sensing signal further comprises:
• adjusting the predetermined signal based on the first position sensing signal outputted by the first position sensing element to control the first position sensing element to output the first position sensing signal having a predetermined constant amplitude.

An electronic device, comprising:

• a position sensing system and a magnet for providing a magnetic field, the position sensing system comprising:
• a signal processing module, a first position sensing element, and at least one second position sensing element, wherein
• the first position sensing element is configured to output a first position sensing signal in response to a predetermined signal;
• the at least one second position sensing element is configured to output a second position sensing signal in response to the predetermined signal;
• and
• the signal processing module is configured to:
• provide the predetermined signal to the first position sensing element and the at least one second position sensing element, correct the second position sensing signal outputted by the at least one of the second position sensing element based on the first position sensing signal, and determine a target sensing signal based on at least one corrected second position sensing signal;
• wherein the signal processing module comprises a digital control circuit, and the digital control circuit is configured to correct the second position sensing signal outputted by the at least one second position sensing element based on the first position sensing signal by:
• substituting the first position sensing signal in a following first predetermined equation to calculate the corrected second position sensing signal:
• V
• ⁢
• 2
• =
• V
• ⁢
• OUT
• *
• A
• ⁢
• 2
• ×
• B
• ⁢
• 2
• A
• ⁢
• 1
• ×
• B
• ⁢
• 1
• .
• where V2 represents the corrected second position sensing signal, VOUT represents the first position sensing signal having a predetermined constant amplitude, A2 represents an amplification factor of the signal processing module for the second position sensing signal outputted by the at least one second position sensing element, A1 represents an amplification factor of the signal processing module for the first position sensing signal outputted by the first position sensing element, B2 represents a magnetic field intensity of the magnetic field at the at least one second position sensing element, and B1 represents a magnetic field intensity of the magnetic field at the first position sensing element,
• wherein the digital control circuit is further configured to adjust the predetermined signal based on the first position sensing signal outputted by the first position sensing element to control the first position sensing element to output the first position sensing signal having a predetermined constant amplitude.