# US 10,481,180 B2 · Method for sensing power consumption and sensing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,180 B2 - Document ID: US10481180B2 - Status: Granted - Kind: B2 - Application number: 15/867,802 - Filed: 2018-01-11 - Published: 2019-05-23 - Granted: 2019-11-19 - Earliest claimed: 2017-11-17 - Assignees: Industrial Technology Research Institute - Applicants: Industrial Technology Research Institute - Inventors: Bo-Yin Chu; Hsu-Cheng Chiang; Ming-Shan Jeng - Web page: https://patentgrep.com/patent/US10481180B2 ## CPC - G01R 15/181: {using coils without a magnetic core, e.g. Rogowski coils} - G01R 22/10: using digital techniques - G01R 19/02: Measuring effective values, i.e. root-mean-square values - G01R 19/175: Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero - G01R 21/006: {Measuring power factor} - G01R 21/133: by using digital technique - G01R 22/065: {related to mechanical aspects} - G01R 11/04: Housings; Supporting racks; Arrangements of terminals - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The method of claim 1, wherein the sensing device senses the change in the waveform of the current or the voltage based on an electromagnetic induction principle. ### Claim 3 (depends on 1) The method of claim 1, further comprising, after performing the integration operation and the digital processing on the waveform of the current or the voltage and prior to calculating the root mean square of the value of the current or the voltage, performing a filtering process. ### Claim 4 (depends on 1) A sensing device, comprising: a housing configured for being positioned on an outer surface of a wire; and a circuit board received in the housing and including a sensing area configured for sensing a change in a waveform of a current or a voltage of the wire to allow the sensing device to perform the method for sensing power consumption of claim 1. ### Claim 5 (depends on 4) The sensing device of claim 4, wherein the housing includes a positioning portion corresponding to the wire. ### Claim 6 (depends on 5) The sensing device of claim 5, wherein the positioning portion is a groove configured for receiving the wire. ### Claim 7 (depends on 4) The sensing device of claim 4, further comprising a fastening part configured for fastening the housing to the wire. ### Claim 8 (depends on 7) The sensing device of claim 7, wherein the fastening part is a cable tie, and the housing is formed with at least one through hole for the cable tie to pass therethrough. ### Claim 9 (depends on 8) The sensing device of claim 8, wherein the cable tie is configured to wind around the wire. ### Claim 10 (depends on 8) The sensing device of claim 8, wherein the housing and the wire abut against each other. ### Claim 11 (depends on 4) The sensing device of claim 4, wherein the circuit board is defined with an analog measuring board area and a digital board area, with a measuring unit and a signal processing circuit provided in the analog measuring board area and a digital operation circuit and a communication unit provided in the digital board area. ### Claim 12 (depends on 11) The sensing device of claim 11, further comprising a microprocessor provided in the digital board area, with at least one of a portion of the digital operation circuit and a portion of the communication unit arranged in the microprocessor. ### Claim 13 (depends on 11) The sensing device of claim 11, wherein the measuring unit includes a layout provided within the sensing area of the circuit board. ### Claim 14 (depends on 13) The sensing device of claim 13, wherein the measuring unit includes two symmetric coils wound in opposite directions. ### Claim 15 (depends on 13) The sensing device of claim 13, wherein the measuring unit includes a sensing layer formed on one side of the circuit board and facing the wire. ### Claim 16 (depends on 15) The sensing device of claim 15, wherein the measuring unit further includes a ground layer formed on the other side of the circuit board. ### Claim 17 (depends on 11) The sensing device of claim 11, wherein the communication unit is configured to transmit signals to a data storage apparatus via a single transmission line. ### Claim 18 (depends on 17) The sensing device of claim 17, wherein the single transmission line is configured to connect another sensing device in series.