Delco Electronics Corporation

William J Johnston

Raymond Lippmann

James Edward Nelson

Michael J Schnars

James R Chintyan

James D Richardson

James W Guest

An apparatus includes a rotatably mounted magnetic rotor, a first coil mounted in proximity of the magnetic rotor, the first coil mounted such that, if the coil is flowing with electric current, the magnetic rotor is within immediate proximity of at least part of a magnetic field created by the coil. The apparatus includes a second coil mounted in proximity of the magnetic rotor, the second coil mounted such that, if the coil is flowing with electric current, the magnetic rotor is within immediate proximity of at least part of a magnetic field created by the coil. A current source is coupled to the first coil, for generating an AC signal and applying the AC signal across the first coil whereby an AC output signal develops across the second coil, the AC output signal having a magnitude that varies in relation to the rotational position of the rotor. A measuring circuit detects the AC output signal and develops therefrom a measure of the position of the rotor.

Method and apparatus for determining the rotational position of a

An air core gauge method and apparatus are disclosed. The apparatus receives an input signal and comprises a gauge device and driver circuit for driving the gauge device. A detection circuit detects transitions in the input signal and provides a control output in response to detected transitions. A power control circuit, responsive to the control output, provides a 100% duty cycle power signal to the driver circuit during detected transitions and otherwise provides a power signal with a duty cycle less than 100% to the driver circuit so that the average power consumed by the gauge is reduced and the operating temperature of the gauge is reduced.

Air core gauge method and apparatus with reduced power dissipation

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Flint, MI, United States of America

William J Johnston