Current sensor with calibration for a current divider configuration
First Claim
1. An integrated circuit current sensor, comprising:
- an integrated current conductor adapted to receive a portion of a calibration current, wherein the calibration current corresponds to a full scale current;
a magnetic field transducer responsive to the calibration current portion for providing a magnetic field signal having a voltage level proportional to a magnetic field generated by the calibration current portion;
a controllable gain stage configured to amplify the magnetic field signal with an adjustable gain in order to provide an amplified magnetic field signal; and
a calibration controller responsive to a calibration command signal from a controller for adjusting the adjustable gain of the controllable gain stage to a calibrated gain to provide the amplified magnetic field signal at a predetermined voltage level that corresponds to a desired current sensor output signal voltage level if the full scale current were received by the integrated current conductor.
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Accused Products
Abstract
An integrated circuit (IC) current sensor that self-calibrates to adjust its signal gain when employed in a current divider configuration is presented. The current sensor includes an integrated current conductor, a magnetic field transducer, a controllable gain stage and a calibration controller. The integrated current conductor is adapted to receive a portion of a calibration current. The calibration current corresponds to a full scale current. The magnetic field transducer, responsive to the calibration current portion, provides a magnetic field signal having a magnitude proportional to a magnetic field generated by the calibration current portion. The controllable gain stage is configured to amplify the magnetic field signal with an adjustable gain to provide an amplified magnetic field signal. The calibration controller is responsive to a calibration command signal to adjust the adjustable gain of the controllable gain stage to a calibrated gain in order to provide the amplified magnetic field signal at a predetermined voltage level that corresponds to a desired current sensor output signal voltage level if the full scale current were received by the integrated current conductor.
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Citations
20 Claims
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1. An integrated circuit current sensor, comprising:
- an integrated current conductor adapted to receive a portion of a calibration current, wherein the calibration current corresponds to a full scale current;
a magnetic field transducer responsive to the calibration current portion for providing a magnetic field signal having a voltage level proportional to a magnetic field generated by the calibration current portion;
a controllable gain stage configured to amplify the magnetic field signal with an adjustable gain in order to provide an amplified magnetic field signal; and
a calibration controller responsive to a calibration command signal from a controller for adjusting the adjustable gain of the controllable gain stage to a calibrated gain to provide the amplified magnetic field signal at a predetermined voltage level that corresponds to a desired current sensor output signal voltage level if the full scale current were received by the integrated current conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- an integrated current conductor adapted to receive a portion of a calibration current, wherein the calibration current corresponds to a full scale current;
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19. A method of self-calibration by a current sensor having an integrated current conductor when coupled in parallel with an external shunt conductor in a current divider configuration, comprising:
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sensing a magnetic field generated by a portion of a calibration current that is provided at a full scale current level to the current divider configuration, the calibration current portion being carried through the integrated current conductor, with a magnetic field transducer positioned in proximity to the integrated current conductor to provide a magnetic field signal having a voltage level proportional to the magnetic field; amplifying the magnetic field signal with an adjustable gain to provide an amplified magnetic field signal; and adjusting the adjustable gain to a calibrated gain in order to provide the amplified magnetic field signal at a predetermined voltage level associated with the calibration current when the calibration current is provided at a full scale current level. - View Dependent Claims (20)
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Specification