Title:
MAGNETIC SENSOR AND CURRENT SENSOR
Document Type and Number:
WIPO Patent Application WO/2001/020349
Kind Code:
A1
Abstract:
The invention provides a magnetic sensor and a current sensor, in which flux gates are used while the offset voltage and the change in offset voltage are reduced. A drive section for exciting a sensor coil (2) includes a self-excited oscillator having a sensor coil (2) in its resonant circuit. The self-excited oscillator includes amplifiers used to continue oscillation: an NPN transistor (21) capable operating during the positive side of the oscillation waveform and a PNP transistor (31) capable operating during the negative side of the oscillation waveform. Since the clamping of the oscillation waveform in the self-excited oscillator occurs in the same manner on the positive and negative sides, the oscillation waveform becomes symmetrical or substantially symmetrical with respect to the horizontal axis.
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Inventors:
NAKAGAWA SHIRO (JP)
YABUSAKI KATSUMI (JP)
YABUSAKI KATSUMI (JP)
Application Number:
PCT/JP2000/003134
Publication Date:
March 22, 2001
Filing Date:
May 16, 2000
Export Citation:
Assignee:
TDK CORP (JP)
NAKAGAWA SHIRO (JP)
YABUSAKI KATSUMI (JP)
NAKAGAWA SHIRO (JP)
YABUSAKI KATSUMI (JP)
International Classes:
G01R15/18; (IPC1-7): G01R19/00
Foreign References:
| US5287059A | 1994-02-15 | |||
| JPH08304481A | 1996-11-22 | |||
| JPS418372B1 | 1966-04-30 |
Attorney, Agent or Firm:
Hoshimiya, Katsumi (Toukou Building 15-7 Shinjuku 5-chome Shinjuku-ku, Tokyo, JP)
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