Magnetic field detecting apparatus

Details Magnetic field detecting apparatus Magnetic field detecting apparatus

2008-07-30

2010-06-15

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Magnetic

Magnetic field detection devices

C324S251000

Reexamination Certificate

active

07737688

ABSTRACT:
The magnetic field detecting apparatus is provided with: a magnetic field detecting unit for outputting one of two signals having different potential levels from each other in response to a perpheral magnetic field; an energizing control unit for producing a periodic energizing control signal indicative of timing at which the magnetic field detecting unit is energized by employing a clock signal and another signal obtained by frequency-dividing, or frequency-multiplying the clock signal, and for supplying the produced energizing control signal to the magnetic field detecting unit; a first inverting unit for inverting the potential level of the output signal of the magnetic field detecting unit; and an energizing time period control unit for supplying a time period control signal to the energizing control unit, the time period control signal controlling the time period of the energizing control signal in response to the potential level of the output signal of the magnetic field detecting unit, and the potential level of the signal obtained by inverting the potential level of the output signal by the first inverting unit. The energizing time period control unit supplies any one of two pieces of the energizing control signals whose durations and time periods are different from each other, during which the magnetic field detecting unit is not energized, in response to the potential level of the time period control signal supplied from the energizing time period control unit.

REFERENCES:
patent: 6727684 (2004-04-01), Hatanaka
patent: 2005-214900 (2005-08-01), None
patent: 2006-153699 (2006-06-01), None
“Product Catalog for Hall IC series Application Notebook,” issued from Handotai-Sha, Matsushita Electric Company, 2004.

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