# US 10,312,836 B2 · Disconnection detection apparatus of sinusoidal wave signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,836 B2 - Document ID: US10312836B2 - Status: Granted - Kind: B2 - Application number: 15/384,809 - Filed: 2016-12-20 - Published: 2017-10-26 - Granted: 2019-06-04 - Earliest claimed: 2016-04-25 - Assignees: Lsis Co., Ltd. - Applicants: Lsis Co., Ltd. - Inventors: Min-Hun Chi - Web page: https://patentgrep.com/patent/US10312836B2 ## CPC - H02P 3/18: for stopping or slowing an AC motor - G01P 21/02: of speedometers - H02K 11/21: Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) - H02P 23/16: Controlling the angular speed of one shaft (H02P23/18 takes precedence) - G01D 5/24457: {Failure detection} - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR ## Abstract Disclosed is a disconnection detection apparatus of a sinusoidal wave signal. The disconnection detection apparatus of the present disclosure converts a first sinusoidal wave and a second sinusoidal wave into absolute values, respectively, and determines that disconnection occurs when a value of the first sinusoidal wave is less than a first comparison value that is greater than a minimum value and a value of the second sinusoidal wave is less than a second comparison value that is less than a maximum value. ## Claims ### Claim 1 A disconnection detection apparatus for determining disconnection, comprising: an amplification unit configured to differentially amplify the first sinusoidal wave and the second sinusoidal wave which are applied thereto; a waveform conversion unit configured to convert the first differentially amplified sinusoidal wave and the second differentially amplified sinusoidal wave into square wave signals; a disconnection detection unit configured to verify the square wave signals to detect connection of each thereof; a first conversion unit configured to convert the first differentially amplified sinusoidal wave and the second differentially amplified sinusoidal wave into absolute values, respectively; and a determination unit configured to compare a first value of the first differentially amplified sinusoidal wave with a predefined first comparison value and a predefined second comparison value, respectively, and compare a second value of the second differentially amplified sinusoidal wave with the first comparison value and the second comparison value, respectively, wherein the determination unit is configured to determine that a disconnection occurs when a value of the first differentially amplified sinusoidal wave is less than a first comparison value that is greater than a minimum value and a value of the second differentially amplified sinusoidal wave is less than a second comparison value that is less than a maximum value, wherein the first comparison value is determined as a value greater than the minimum absolute value of the first or second differentially amplified sinusoidal wave signal, and the second comparison value is determined as a value less than the maximum value of the first or second differentially amplified sinusoidal wave signal, wherein the determination unit determines that the disconnection occurs when the value of the second differentially amplified sinusoidal wave is less than the first comparison value and the value of the first differentially amplified sinusoidal wave is less than the second comparison value, wherein the determination unit determines that the disconnection does not occur when the value of the first differentially amplified sinusoidal wave signal is greater than the second comparison value, and wherein the determination unit determines that the disconnection does not occur when the value of the second differentially amplified sinusoidal wave signal is greater than the first comparison value. ### Claim 2 (depends on 1) The disconnection detection apparatus of claim 1, wherein the determination unit determines that the disconnection does not occur when the value of the second differentially amplified sinusoidal wave is less than the first comparison value and the value of the first differentially amplified sinusoidal wave is greater than the second comparison value and is less than the maximum value. ### Claim 3 (depends on 1) The disconnection detection apparatus of claim 1, further comprising a second conversion unit configured to convert the first differentially amplified sinusoidal wave signal and the second differentially amplified sinusoidal wave signal into a first sinusoidal wave and a second sinusoidal wave which are digital data. ### Claim 4 (depends on 3) The disconnection detection apparatus of claim 3, further comprising: an elimination unit configured to eliminate offsets of the first differentially amplified sinusoidal wave and the second differentially amplified sinusoidal wave. ### Claim 5 (depends on 1) The disconnection detection apparatus of claim 1, wherein the determination unit determines that the disconnection does not occur when the value of the first differentially amplified sinusoidal wave is less than the first comparison value and the value of the second differentially amplified sinusoidal value is greater than the second comparison value and is less than the maximum value. ### Claim 6 (depends on 1) The disconnection detection apparatus of claim 1, wherein the second differentially amplified sinusoidal wave has a phase difference of 90 degrees with respect to the first differentially amplified sinusoidal wave.