# US 2013/0158909 A1 · Power quality monitoring apparatus and method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0158909 A1 - Document ID: US20130158909A1 - Status: Published application - Kind: A1 - Application number: 13/461,511 - Filed: 2012-05-01 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: Samsung Electro-Mechanics Co., Ltd. - Inventors: Wan Cheol Yang; Jung Hoo Lee; Kyung Uk Kim - Web page: https://patentgrep.com/patent/US20130158909A1 ## CPC - G01R 19/0084: {Measuring voltage only} - G01R 19/04: Measuring peak values {or amplitude or envelope} of AC or of pulses - G01R 19/30: Measuring the maximum or the minimum value of current or voltage reached in a time interval (G01R19/04 takes precedence) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract The present invention includes a calculating unit for calculating an absolute value of an applied commercial voltage, an accumulating unit for accumulating the absolute value of the applied commercial voltage per a constant period to output, an extracting unit for sampling an absolute value accumulative maximum value of the commercial voltage for each period and a determining unit for determining a quality of the commercial voltage by using the absolute value accumulative maximum value of the sampled commercial voltage. It has an advantage that the power quality can be monitored at high speed. ## Claims ### Claim 1 A power quality monitoring apparatus, comprising: a calculating unit for calculating an absolute value of an applied commercial voltage; an accumulating unit for accumulating the absolute value of the applied commercial voltage per a constant period to output; an extracting unit for sampling an absolute value accumulative maximum value of the commercial voltage for each period; and a determining unit for determining a quality of the commercial voltage by using the absolute value accumulative maximum value of the sampled commercial voltage. ### Claim 2 (depends on 1) The power quality monitoring apparatus according to claim 1, further comprising a control unit to control so as to sample the absolute value accumulative maximum value of the commercial voltage in the extracting unit whenever the commercial voltage reaches a predetermined time by monitoring the applied commercial voltage. ### Claim 3 (depends on 2) The power quality monitoring apparatus according to claim 2, wherein the control unit controls so as to initialize the absolute value of the commercial voltage accumulated in the accumulating unit after controlling so as to sample the absolute value accumulative maximum value of the commercial voltage. ### Claim 4 (depends on 2) The power quality monitoring apparatus according to claim 2, wherein the predetermined time is a time when the commercial voltage is zero crossed. ### Claim 5 (depends on 4) The power quality monitoring apparatus according to claim 4, wherein the time when the commercial voltage is zero crossed reaches per a half period of the commercial voltage. ### Claim 6 (depends on 2) The power quality monitoring apparatus according to claim 2, wherein the control unit includes: a detector for detecting whether the commercial voltage reaches the predetermined time or not by monitoring the applied commercial voltage; and a timing controller for outputting an extraction control signal to the extracting unit so as to sample the absolute value accumulative maximum value of the commercial voltage in the extracting unit when the commercial voltage reaches the predetermined time. ### Claim 7 (depends on 6) The power quality monitoring apparatus according to claim 6, wherein the timing controller further outputs a reset control signal to the accumulating unit so as to initialize the absolute value of the commercial voltage accumulated in the accumulating unit after an extraction control signal is outputted to the extracting unit. ### Claim 8 (depends on 1) The power quality monitoring apparatus according to claim 1, wherein the extracting unit is a sample and hold circuit. ### Claim 9 (depends on 1) The power quality monitoring apparatus according to claim 1, wherein the commercial voltage is an alternative voltage. ### Claim 10 (depends on 9) The power quality monitoring apparatus according to claim 9, wherein the calculating unit includes a rectifier to rectifying the alternative voltage. ### Claim 11 (depends on 1) The power quality monitoring apparatus according to claim 1, further comprising a noise removing unit for removing a noise of the applied commercial voltage. ### Claim 12 (depends on 1) The power quality monitoring apparatus according to claim 1, further comprising a gain control unit for controlling a gain of an absolute value of the outputted commercial voltage. ### Claim 13 (depends on 1) The power quality monitoring apparatus according to claim 1, wherein the determining unit compares a predetermined reference voltage with an absolute value accumulative maximum value of the sampled commercial voltage and determines a quality of the commercial voltage by using the compared result. ### Claim 14 (depends on 13) The power quality monitoring apparatus according to claim 13, wherein the determining unit compares a first predetermined reference voltage and a predetermined second reference voltage with the absolute value accumulative maximum value of the sampled commercial voltage and determines whether a voltage swell or a voltage sag is generated at the commercial voltage by using the compared result. ### Claim 15 (depends on 14) The power quality monitoring apparatus according to claim 14, wherein the determining unit includes a first determining device to determine that the voltage swell is generate if the absolute value accumulative maximum value of the sampled commercial voltage is larger than the first reference voltage. ### Claim 16 (depends on 14) The power quality monitoring apparatus according to claim 14, wherein the determining unit includes a second determining device to determine that the voltage sag is generate if the absolute value accumulative maximum value of the sampled commercial voltage is smaller than the second reference voltage. ### Claim 17 A method for monitoring a power quality, comprising: calculating an absolute value of an applied commercial voltage; accumulating the absolute value of the commercial voltage per a constant period to output; sampling an absolute value accumulative maximum value of the commercial voltage per each period; and determining a quality of the commercial voltage by using the absolute value accumulative maximum value of the sampled commercial voltage. ### Claim 18 (depends on 17) The method for monitoring a power quality according to claim 17, before sampling an absolute value accumulative maximum value of the commercial voltage per each period, further comprising: monitoring the applied commercial voltage; and outputting an extracting control signal so as to sample the absolute value accumulative maximum value of the commercial voltage whenever the commercial voltage reaches the predetermined time, wherein sampling an absolute value accumulative maximum value of the commercial voltage per each period samples the absolute value accumulative maximum value of the commercial voltage whenever the extracting control signal is outputted. ### Claim 19 (depends on 18) The method for monitoring a power quality according to claim 18, after outputting an extracting control signal, further comprising: outputting a reset control signal so as to initialize the absolute value of the accumulative commercial voltage, wherein accumulating the absolute value of the commercial voltage per a constant period to output initializes the absolute value of the accumulated commercial voltage whenever the reset control signal is outputted. ### Claim 20 (depends on 18) The method for monitoring a power quality according to claim 18, wherein the predetermined time is a time when the commercial voltage is zero crossed. ### Claim 21 (depends on 20) The method for monitoring a power quality according to claim 20, wherein the time when the commercial voltage is zero crossed reaches per half period of the commercial voltage. ### Claim 22 (depends on 17) The method for monitoring a power quality according to claim 17, wherein determining a quality of the commercial voltage compares a first predetermined reference voltage and a second predetermined reference voltage with the absolute value accumulative maximum value of the sampled commercial voltage and determines whether a voltage swell or a voltage sag is generated at the commercial voltage by using the compared result.