DYNAMIC COMPENSATION OF AGING DRIFT IN CURRENT SENSE RESISTOR
First Claim
1. A current sense resistor circuit comprisinga primary current sense resistor that drifts with age;
- a secondary current sense resistor that drifts with age in substantial unison with the primary current sense resistor;
a calibration resistor that does not drift with age in substantial unison with the primary current sense resistor; and
a compensation circuit configured to compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor.
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Accused Products
Abstract
A current sense resistor circuit may include a primary current sense resistor that drifts with age. A secondary current sense resistor may drift with age in substantial unison with the primary current sense resistor. A calibration resistor may not drift with age in substantial unison with the primary current sense resistor. A compensation circuit may compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor. The secondary current sense resistor may be in parallel with the primary current sense resistor, except when the compensation circuit is comparing the calibration resistor with the secondary current sense resistor.
55 Citations
22 Claims
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1. A current sense resistor circuit comprising
a primary current sense resistor that drifts with age; -
a secondary current sense resistor that drifts with age in substantial unison with the primary current sense resistor; a calibration resistor that does not drift with age in substantial unison with the primary current sense resistor; and a compensation circuit configured to compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A current sense resistor circuit comprising
a primary current sense resistor that drifts with age; -
a secondary current sense resistor; a calibration resistor; and a compensation circuit configured to compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor. - View Dependent Claims (22)
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Specification