System and method to calculate RMS current and true power in a multidrop sensor network
First Claim
1. A system for monitoring a plurality of circuit branches coupled to an input line, the system comprising:
- a communication bus;
a plurality of sensor circuits, each configured to be coupled to the communication bus and at least one of the plurality of circuit branches, wherein each sensor circuit is further configured to sample current in the at least one of the plurality of circuit branches;
a controller configured to be coupled to the communication bus and the input line;
wherein the controller is further configured to;
detect a voltage waveform on the input line;
determine a phase angle of the voltage waveform for sampling current and voltage;
broadcast, at a time based on the determined phase angle, a signal to each one of the plurality of sensor circuits to begin sampling current in a respective one of the plurality of circuit branches; and
sample, at the time based on the determined phase angle, voltage on the input line.
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Accused Products
Abstract
According to one aspect, embodiments of the invention provide a system for monitoring a plurality of circuit branches coupled to an input line, the system comprising a communication bus, a plurality of sensor circuits, each configured to be coupled to the communication bus and at least one of the plurality of circuit branches, wherein each sensor circuit is further configured to sample current in the at least one of the plurality of circuit branches, a controller configured to be coupled to the communication bus and the input line; wherein the controller is further configured to sample voltage on the input line, and wherein the controller is further configured to synchronize, via the communication bus, current sampling performed by the plurality of sensor circuits with the voltage sampling performed by the controller.
37 Citations
17 Claims
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1. A system for monitoring a plurality of circuit branches coupled to an input line, the system comprising:
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a communication bus; a plurality of sensor circuits, each configured to be coupled to the communication bus and at least one of the plurality of circuit branches, wherein each sensor circuit is further configured to sample current in the at least one of the plurality of circuit branches; a controller configured to be coupled to the communication bus and the input line;
wherein the controller is further configured to;detect a voltage waveform on the input line; determine a phase angle of the voltage waveform for sampling current and voltage; broadcast, at a time based on the determined phase angle, a signal to each one of the plurality of sensor circuits to begin sampling current in a respective one of the plurality of circuit branches; and sample, at the time based on the determined phase angle, voltage on the input line. - View Dependent Claims (2, 3, 4)
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5. A method for monitoring a plurality of circuit branches coupled to a power line, the method comprising:
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coupling a sensor circuit to each one of the plurality of circuit branches and to a communication bus; coupling a controller to the communication bus and to the power line; detecting, by the controller, a voltage waveform on the power line; determining, with the controller, a phase angle of the voltage waveform for sampling current and sampling voltage; broadcasting, at a time based on the determined phase angle, with the controller via the communication bus, a signal to at least one of the sensor circuits to begin the act of sampling current; and sampling, at the time based on the determined phase angle, with the controller, voltage on the power line. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for monitoring a plurality of circuit branches coupled to an input line, the system comprising:
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a communication bus; a plurality of sensor circuits, each configured to be coupled to the communication bus and at least one of the plurality of circuit branches, wherein each sensor circuit is further configured to sample current in the at least one of the plurality of circuit branches; a controller configured to be coupled to the communication bus and the input line and to detect a voltage waveform on the input line; and means for synchronizing current sampling performed by at least one of the plurality of sensor circuits and voltage sampling performed by the controller to begin at a time based on a phase angle of the voltage waveform determined by the controller. - View Dependent Claims (16, 17)
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Specification