Electricity: power supply or regulation systems – Including an impedance – Hall effect device or magnetoresistor
Patent
1989-11-27
1991-02-19
Wong, Peter S.
Electricity: power supply or regulation systems
Including an impedance
Hall effect device or magnetoresistor
323231, 323271, 307309, H03K 1790
Patent
active
049947311
ABSTRACT:
A device for sensing the speed of a rotating element in a vehicle replaces the practice of using magnetic wire coil pickup devices placed in close proximity to a rotating element, such as a gear. The main speed sensing component is a conventional three lead Hall effect device which produces a voltage each time it is exposed to the presence of a magnetic force which exceeds a predetermined value. The adoption of a device which produces the Hall effect introduces the complication of harmonizing the connection of the three leads of the standard Hall effect device with the connections conventionally found in existing installation of only two leads between the sensing unit and the controlled element. Transistor diode and resistive components mounted in the same housing as the Hall effect device provide a configuration entirely compatible with existing two lead systems.
REFERENCES:
patent: 3601773 (1971-08-01), Frieling et al.
patent: 3660695 (1972-05-01), Schmitt
patent: 3660696 (1972-05-01), Rittmann
patent: 4134030 (1979-01-01), Pace
patent: 4218659 (1980-08-01), Arai
patent: 4374333 (1983-02-01), Avery
patent: 4521727 (1985-06-01), Atherton et al.
patent: 4645950 (1987-02-01), Carvajal
patent: 4761569 (1988-08-01), Higgs
Michael Oppenheimer, "In IC Form, Hall-Effect Devices Can Take on Many New Applications", Electronics, Aug. 2, 1971, vol. 44, No. 16, pp. 46-93.
AuBuchon F. David
Navistar International Transportation Corp.
Sullivan Dennis K.
Wong Peter S.
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