Method for operation of a self-powered power sensor (SPPS) having a reservoir capacitor
First Claim
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1. A method of operation of a self-powered power sensor (SSPS), the method comprising:
- checking periodically if a reservoir capacitor of a SSPS is adequately charged for the purpose of switching from an energy harvesting mode of the SSPS to a current sensing mode of the SSPS;
switching to the sensing mode upon determination that the reservoir capacitor is adequately charged to power the SSPS in the current sensing mode;
repeating a plurality of times a sampling at a predetermined rate a plurality of samples of a current of a secondary winding of a current transformer (CT) of the SSPS;
determining a current value respective of the plurality of samples of the current of the secondary winding, and a time synchronization signal, the time synchronization signal being configured to account for an internal drift of a clock of a microcontroller to be smaller than an allowed error in a current to voltage phase measurement; and
transmitting the current value and the time synchronization signal so that a receiver determines at least an electrical parameter.
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Abstract
Methods of operation of a self-powered power sensor (SPPS) are provided for the measurement of the likes of current, power, power factor, and other parameters related to the power consumption, at points of interest, such as circuit breakers, machines, and the like. Each SPPS is enabled to communicate its respective data, in an environment of a plurality of such apparatuses, to a management unit which may further process the data sent thereto, as well as communicate back to the SPPS for the purpose of synchronization of, for example, clocks of the SPPS and the management unit.
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10 Claims
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1. A method of operation of a self-powered power sensor (SSPS), the method comprising:
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checking periodically if a reservoir capacitor of a SSPS is adequately charged for the purpose of switching from an energy harvesting mode of the SSPS to a current sensing mode of the SSPS; switching to the sensing mode upon determination that the reservoir capacitor is adequately charged to power the SSPS in the current sensing mode; repeating a plurality of times a sampling at a predetermined rate a plurality of samples of a current of a secondary winding of a current transformer (CT) of the SSPS; determining a current value respective of the plurality of samples of the current of the secondary winding, and a time synchronization signal, the time synchronization signal being configured to account for an internal drift of a clock of a microcontroller to be smaller than an allowed error in a current to voltage phase measurement; and transmitting the current value and the time synchronization signal so that a receiver determines at least an electrical parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification