Position detecting device and position detecting method
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United States of America Patent
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Oct 19, 2010
Grant Date -
Jul 9, 2009
app pub date -
Apr 26, 2007
filing date -
Apr 27, 2006
priority date (Note) -
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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 Vhe1 of a Hall element becomes AKBhe1 (A is the amplification factor of a preamplifier, K is a constant, and Bhe1 is 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 AKBhe1+Vref=AGND (=0) holds. The Hall voltage Vhe2 of the Hall element after amplification becomes AKBhe2. Since K=-Vref/ABhe1, the Hall voltage Vhe2 of the Hall element is given by -VrefBhe2/Bhe1.
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