Calibration Shunt
First Claim
Patent Images
1. A battery monitoring system comprising:
- a signal bus including at least two sense signal conductors, at least two interrogation signal conductors and one or more logic conductors;
a plurality of battery selectors, each of the battery selectors being configured to be electronically attached to a battery and each includinga calibration shunt of known impedance;
at least two pole interfaces, each of the pole interfaces configured to communicate interrogation signals to a respective battery pole and to receive sense signals from the respective battery pole, the interrogation signals and sense signals being communicated via separate electrical conductors of a Kelvin probe, andswitch logic configured to receive selector selection signals via the one or more logic conductors, and configured to select between, in the alternative, testing across the calibration shunt and testing across the at least two pole interfaces; and
a central monitoring unit electrically coupled to the plurality of battery selectors by the signal bus, the central monitoring unit beingconfigured to provide the interrogation signals to the plurality of battery selectors via the interrogation signal conductors,configured to receive the sense signals from the plurality of battery selectors via the sense signal conductors, andconfigured to send the selector selection signals to the plurality of battery selectors via the logic conductors so as to select an individual member of the plurality of battery selectors and, within the selected individual member of the plurality of battery selectors, to select between testing across the calibration shunt and testing across the respective battery poles.
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Abstract
A battery monitoring system includes a central monitoring system and a set of individual battery selectors. The central monitoring system is electrically connected to the battery selectors and each of the battery selectors is connected to one or more batteries. In operation, commands are sent from the central monitoring system to the individual battery selectors so as to turn one on at a time. When the battery selector is on, test and response signals can be communicated between the one or more batteries connected to the battery selector and the central monitoring system. In some embodiments, the batteries include a reference circuit configured for calibration of battery tests.
10 Citations
20 Claims
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1. A battery monitoring system comprising:
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a signal bus including at least two sense signal conductors, at least two interrogation signal conductors and one or more logic conductors; a plurality of battery selectors, each of the battery selectors being configured to be electronically attached to a battery and each including a calibration shunt of known impedance; at least two pole interfaces, each of the pole interfaces configured to communicate interrogation signals to a respective battery pole and to receive sense signals from the respective battery pole, the interrogation signals and sense signals being communicated via separate electrical conductors of a Kelvin probe, and switch logic configured to receive selector selection signals via the one or more logic conductors, and configured to select between, in the alternative, testing across the calibration shunt and testing across the at least two pole interfaces; and a central monitoring unit electrically coupled to the plurality of battery selectors by the signal bus, the central monitoring unit being configured to provide the interrogation signals to the plurality of battery selectors via the interrogation signal conductors, configured to receive the sense signals from the plurality of battery selectors via the sense signal conductors, and configured to send the selector selection signals to the plurality of battery selectors via the logic conductors so as to select an individual member of the plurality of battery selectors and, within the selected individual member of the plurality of battery selectors, to select between testing across the calibration shunt and testing across the respective battery poles. - View Dependent Claims (2, 3, 4, 5)
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6. A battery selector comprising:
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a calibration shunt of known impedance; at least a first pole interface and a second pole interface, each of the first and second pole interfaces being configured to be electrically connected to a respective battery pole; switch logic configured to receive selector selection signals, the switch logic being configured to generate an output responsive to the received selector selection signals; at least one relay configured to be switched in response to the output of the switch logic, and configured such that the calibration shunt receives interrogation signals in a first position of the relay, and the first pole interface receives interrogation signals in a second position of the relay. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A central monitoring system comprising
a bus interface configured to be electrically connected to a signal bus; -
interrogation signal logic configured to provide interrogation signals to the bus interface, the interrogation signals being further configured for detecting a state of a battery monitored by the central monitoring unit; sensing logic configured to receive sense signals from the battery, the sense signals being in response to the interrogation signals, the sensing logic being further configured to interpret the received sense signals and generate data characterizing a state of the battery based on the interpretation; selection logic configured to provide selection signals to the bus interface, the selection signals being configured to select between interrogation of the battery or interrogation of a calibration shunt; memory configured to store the data characterizing the state of the battery; and a microprocessor configured to execute at least the sensing logic. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification