# US 11,908,614 B2 · Active current compensation device capable of detecting malfunction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,614 B2 - Document ID: US11908614B2 - Status: Granted - Kind: B2 - Application number: 17/474,558 - Filed: 2021-09-14 - Published: 2022-06-30 - Granted: 2024-02-20 - Earliest claimed: 2020-12-23 - Assignees: Em Coretech Inc.; Unist (Ulsan National Institute of Science and Technology) - Applicants: Em Coretech Co., Ltd.; Unist (Ulsan National Institute of Science and Technology) - Inventors: Jin Gook Kim; Sang Yeong Jeong - Web page: https://patentgrep.com/patent/US11908614B2 ## CPC - H01F 27/427: {for current transformers} - H03F 3/45475: {using IC blocks as the active amplifying circuit} - G01R 19/10: Measuring sum, difference or ratio - G01R 19/165: Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values - G01R 19/16576: {comparing DC or AC voltage with one threshold (G01R19/16514, G01R19/16519, G01R19/16528, G01R19/16533 and G01R19/1659 take precedence)} - G01R 31/2827: {Testing of electronic protection circuits (testing switches G01R31/327; checking alarm systems G08B29/00; self test of summation current transformers H02H3/335)} - H01F 27/42: Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H) - H02M 1/00: Details of apparatus for conversion - H02M 1/123: {Suppression of common mode voltage or current} - H02M 1/44: Circuits or arrangements for compensating for electromagnetic interference in converters or inverters - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H03F 1/22: by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively - H03F 1/305: {in case of switching on or off of a power supply} - H10D 84/00: Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers - H01F 38/48: {Common mode inductor for reducing or eliminating common mode noise on parallel lines} - H01F 2017/065: {Core mounted around conductor to absorb noise, e.g. EMI filter} - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 1/36: Means for starting or stopping converters - H03F 2203/45138: Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H03F: AMPLIFIERS - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract This application relates to an active current compensation device which actively compensates for a noise occurring in a common mode in each of two or more high-current paths. In one aspect, the active current compensation device includes a sensing unit configured to generate an output signal corresponding to a common-mode noise current on each of the two or more high-current paths, and an amplification unit configured to amplify the output signal to generate an amplified current. The device may also include a compensation unit configured to generate a compensation current on the basis of the amplified current and allow the compensation current to flow to each of the two or more high-current paths, and a malfunction detection unit configured to detect a malfunction of the amplification unit. The malfunction detection unit and at least a portion of the amplification unit may be embedded in one integrated circuit (IC) chip. ## Claims ### Claim 1 An active current compensation device which actively compensates for a noise occurring in a common mode in each of two or more high-current paths, the active current compensation device comprising: a sensing unit configured to generate an output signal corresponding to a common-mode noise current on each of the two or more high-current paths; an amplification unit configured to amplify the output signal to generate an amplified current; a compensation unit configured to generate a compensation current on the basis of the amplified current and allow the compensation current to flow to each of the two or more high-current paths; and a malfunction detection unit configured to detect a malfunction of the amplification unit, wherein the malfunction detection unit and at least a portion of the amplification unit are embedded in one integrated circuit (IC) chip. ### Claim 2 (depends on 1) The active current compensation device of claim 1, wherein signals at two nodes included in the amplification unit are differentially input to the malfunction detection unit. ### Claim 3 (depends on 1) The active current compensation device of claim 1, wherein the amplification unit includes a first transistor and a second transistor, and wherein one node of the first transistor and one node of the second transistor are respectively connected to input terminals of the malfunction detection unit. ### Claim 4 (depends on 1) The active current compensation device of claim 1, wherein the malfunction detection unit is configured to: detect a differential direct current (DC) voltage at two nodes included in the amplification unit, and detect whether the differential DC voltage is in a predetermined range. ### Claim 5 (depends on 1) The active current compensation device of claim 1, wherein the one IC chip includes a terminal to be connected to a power supply which supplies power to the amplification unit and the malfunction detection unit, a terminal to be connected to a reference potential of the amplification unit and the malfunction detection unit, and an output terminal of the malfunction detection unit. ### Claim 6 (depends on 1) The active current compensation device of claim 1, wherein the one IC chip includes a terminal to be connected to a switch for selectively supplying power to the malfunction detection unit.