Activity-based battery monitor with a universal current measuring apparatus
First Claim
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1. A battery monitoring apparatus comprising:
- conductive lines configured to couple to a conductive element having an electrical current;
a filter coupled to the conductive lines and configured to filter noise from a signal derived from a voltage difference between the conductive lines, wherein the signal represents a current in the conductive element resulting from the voltage difference;
an analog-to-digital converter that converts the signal filtered by the filter and outputs a digital signal;
a meter configured to measure an actual current; and
a controller that receives the digital signal and the measured actual current and computes a correction factor using the received digital signal and the received actual current.
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Abstract
A battery monitoring apparatus that obtains a current measurement for a current in a conductive element. The battery monitoring apparatus includes conductive lines configured to couple to a conductive element having an electrical current, a filter coupled to the conductive lines and configured to filter noise from a signal derived from a voltage difference between the conductive lines, an analog-to-digital converter that converts the signal filtered by the filter and outputs a digital signal, and a controller that receives the digital signal from the analog-to-digital converter.
35 Citations
25 Claims
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1. A battery monitoring apparatus comprising:
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conductive lines configured to couple to a conductive element having an electrical current; a filter coupled to the conductive lines and configured to filter noise from a signal derived from a voltage difference between the conductive lines, wherein the signal represents a current in the conductive element resulting from the voltage difference; an analog-to-digital converter that converts the signal filtered by the filter and outputs a digital signal; a meter configured to measure an actual current; and a controller that receives the digital signal and the measured actual current and computes a correction factor using the received digital signal and the received actual current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for obtaining a current in an activity-based battery monitoring apparatus, the method comprising:
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filtering a signal from wires coupled to a conductive element, wherein the signal represents a sensed current resulting from a voltage drop across the conductive element; converting the signal from an analog form to a digital form; and performing a calibration procedure by which a correction factor is computed using an actual current measurement and the sensed current. - View Dependent Claims (11, 12, 13)
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14. A battery monitoring apparatus comprising:
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(a) a voltage sense input port to which leads extending to a battery may be connected such that a voltage signal representing the voltage across the battery is provided to the voltage sense input port; and (b) a current sense input port to which leads extending to a universal current measuring apparatus may be connected such that a current signal representing the current through the battery is provided to the universal current measuring apparatus, wherein the universal current measuring apparatus comprises a first filter to remove noise from a received current signal, an analog-to-digital converter to convert the filtered current signal to a digital signal, and a controller programmed to receive an actual current measurement and the digital signal and to compute a correction factor using the received actual current measurement and the received digital signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification