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US 10,481,180 B2Granted
Method for sensing power consumption and sensing device
AssigneeIndustrial Technology Research Institute
InventorsBo-Yin Chu, Hsu-Cheng Chiang, Ming-Shan Jeng
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Abstract
A sensing device includes a housing positioned on an outer surface of a wire and a circuit board received in the housing. The circuit board has a sensing area for sensing the wire, such that the measurements obtained by the circuit board are relative values. Therefore, the circuit design of the circuit board can be simplified, and the size of the sensing device can be reduced.
Claims18
A method for sensing power consumption, comprising:
- sensing, by a sensing device, a change in a waveform of a current or a voltage on a wire;
- performing integration operation and digital processing on the waveform of the current or the voltage;
- calculating a root mean square of a value of the current or the voltage, wherein the value of the current or the voltage is a relative value, wherein the relative value is a simple number and free from being a measured value of a physical electricity meter;
- and
- calculating a power factor after calculating the root mean square of the value of the current or the voltage, wherein calculating the power factor includes detecting zero crossings of the current and the voltage to measure a time difference between the zero crossings, and correcting a non-linear load error based on distortion in the waveform of the current to obtain the power factor.
2 more elements
Dependencies are inferred from the claim text.