Position detecting device and position detecting method

Details Position detecting device and position detecting method Position detecting device and position detecting method

2007-04-26

2010-10-19

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Orientation or position

C324S207170

Reexamination Certificate

active

07818138

ABSTRACT:
The present invention relates to a position detecting device capable of canceling an error due to looseness in a vertical direction and of eliminating variation in temperature characteristics by calculating a ratio between output voltages of a plurality of Hall elements. Assuming that the Hall voltage Vhe1of a Hall element becomes A·K·Bhe1(A is the amplification factor of a preamplifier, K is a constant, and Bhe1is the magnetic flux density the Hall element receives), then a PI regulator automatically adjusts the bias point of the PI output by feedback control in such a manner that A·K·Bhe1+Vref=AGND (=0) holds. The Hall voltage Vhe2of the Hall element after amplification becomes A·K·Bhe2. Since K=−Vref/A·Bhe1, the Hall voltage Vhe2of the Hall element is given by −Vref·Bhe2/Bhe1.

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International Preliminary Report on Patentability dated Jan. 22, 2009, four (4) pages.

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