# US 12,001,377 B2 · Universal serial bus port controller and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,001,377 B2 - Document ID: US12001377B2 - Status: Granted - Kind: B2 - Application number: 17/818,098 - Filed: 2022-08-08 - Published: 2023-02-16 - Granted: 2024-06-04 - Earliest claimed: 2021-08-10 - Assignees: Rohm Co., Ltd. - Applicants: ROHM Co., LTD. - Inventors: Nobutaka Itakura - Web page: https://patentgrep.com/patent/US12001377B2 ## CPC - G06F 13/4282: {on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247)} - G06F 2213/0042: Universal serial bus [USB] - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Disclosed herein is a universal serial bus port controller on a source side. The universal serial bus port controller is compatible with universal serial bus Type-C. A source is equipped with the universal serial bus port controller including a power supply terminal, a power supply circuit, a switch connected between an output of the power supply circuit and the power supply terminal, a capacitor connected to the power supply terminal, and a discharge resistance and a discharge switch connected in series with each other between the power supply terminal and a ground line. The universal serial bus port controller includes an abnormality detector which detects an output voltage of the power supply terminal a plurality of times after the discharge switch is turned on and detects an abnormality on the basis of a temporal change in the output voltage. ## Claims ### Claim 1 A universal serial bus port controller on a source side, the universal serial bus port controller being compatible with universal serial bus Type-C, a source equipped with the universal serial bus port controller including a power supply terminal, a power supply circuit, a switch connected between an output of the power supply circuit and the power supply terminal, a capacitor connected to the power supply terminal, and a discharge resistance and a discharge switch connected in series with each other between the power supply terminal and a ground line, the universal serial bus port controller comprising: an abnormality detector configured to: determine a threshold voltage that decreases according to an elapsed time from turn on of the discharge switch; detect an output voltage of the power supply terminal at a plurality of times after the turn on of the discharge switch; and detect, based on a temporal change in the output voltage, an abnormality when the output voltage detected at a time of the plurality of times exceeds the threshold voltage corresponding to the time. ### Claim 2 (depends on 1) The universal serial bus port controller according to claim 1, wherein the threshold voltage is determined for each voltage level immediately previously supplied by the power supply circuit. ### Claim 3 (depends on 1) The universal serial bus port controller according to claim 1, wherein the abnormality detector is further configured to calculate power based on the output voltage detected at each time, and determine the abnormality when a value obtained by integrating the power at each time exceeds a threshold value. ### Claim 4 (depends on 3) The universal serial bus port controller according to claim 3, wherein the threshold value is determined for each voltage level immediately previously supplied by the power supply circuit. ### Claim 5 (depends on 1) The universal serial bus port controller according to claim 1, wherein the discharge switch is included in the universal serial bus port controller. ### Claim 6 (depends on 1) The universal serial bus port controller according to claim 1, wherein the discharge resistance is included in the universal serial bus port controller. ### Claim 7 (depends on 1) The universal serial bus port controller according to claim 1, wherein the universal serial bus port controller is integrated on one semiconductor substrate. ### Claim 8 (depends on 1) An electronic apparatus comprising: the universal serial bus port controller according to claim 1. ### Claim 9 An electronic apparatus, comprising: a universal serial bus receptacle including a power supply terminal and a grounding terminal; a power supply circuit; a switch connected between an output of the power supply circuit and the power supply terminal; a capacitor connected to the power supply terminal; a discharge resistance and a discharge switch connected in series with each other between the power supply terminal and a ground line; and an abnormality detector configured to: determine a threshold voltage that decreases according to an elapsed time from turn on of the discharge switch; detect an output voltage of the power supply terminal at a plurality of times after the turn on of the discharge switch; and detect, based on a temporal change in the output voltage, an abnormality when the output voltage detected at a time of the plurality of times exceeds the threshold voltage corresponding to the time. ### Claim 10 (depends on 9) The electronic apparatus according to claim 9, wherein the threshold voltage is determined for each voltage level immediately previously supplied by the power supply circuit. ### Claim 11 (depends on 9) The electronic apparatus according to claim 9, wherein the abnormality detector is further configured to calculate power based on the output voltage detected at each time, and determine the abnormality when a value obtained by integrating the power at each time exceeds a threshold value. ### Claim 12 (depends on 11) The electronic apparatus according to claim 11, wherein the threshold value is determined for each voltage level immediately previously supplied by the power supply circuit.