POSITION DETECTION DEVICE AND POSITION DETECTION METHOD

Title:

POSITION DETECTION DEVICE AND POSITION DETECTION METHOD

Document Type and Number:

WIPO Patent Application WO/2007/126023

Kind Code:

A1

Abstract:

Provided are a position detection device and a position detection method capable of acquiring a ratio of the output voltage of a plurality of hall elements so as to eliminaprocédé et dispsitif de détection de positionte irregularities of temperature characteristics and an error caused by a longitudinal-direction fluctuation. If hall voltage Vhe1 of a hall element (22a) has become A K Bhe1 (A is an amplification ratio of a preamplifier (32), K is a constant, and Bhel is a magnetic flux density applied to the hall element), a PI regulator (41) automatically changes the bias point of the PI output so as to obtain A K Bhe1 + Vref = AGND (=0) by feedback control. The hall voltage Vhe2 of the hall element (22b) after the amplification is A K Bhe2. Since K = -Vref/A Bhe1, the hall voltage Bhe2 of the hall element is –Vref Bhe2/Bhe1. The hall voltage is proportional to the magnetic flux density and accordingly, this is equivalent to division of the output voltage of the hall element (22a) and the hall element (22b).

Inventors:

YOSHIDA TAKASHI (JP)
SUZUKI MASARU (JP)
KAKUTA KATSUMI (JP)

Application Number:

PCT/JP2007/059114

Publication Date:

November 08, 2007

Filing Date:

April 26, 2007

Export Citation:

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Assignee:

ASAHI KASEI EMD CORP (JP)
YOSHIDA TAKASHI (JP)
SUZUKI MASARU (JP)
KAKUTA KATSUMI (JP)

International Classes:

G01D5/14; G01B7/00; G02B7/08

Foreign References:

JP2001091208A	2001-04-06
JP2003344187A	2003-12-03
JP2002054903A	2002-02-20
JP2006058818A	2006-03-02
JP2004132751A	2004-04-30
JP2005331399A	2005-12-02

Other References: