# US 2023/0273672 A1 · Power supply management method, apparatus, and system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0273672 A1 - Document ID: US20230273672A1 - Status: Published application - Kind: A1 - Application number: 18/313,308 - Filed: 2023-05-05 - Published: 2023-08-31 - Earliest claimed: 2020-11-19 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Jincan Cao; Chao Ren; Jianhua Xu; Yu Ding - Web page: https://patentgrep.com/patent/US20230273672A1 ## CPC - G06F 1/3296: by lowering the supply or operating voltage - H04L 12/10: Current supply arrangements - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract This application discloses a power supply management system, and a power supply management method and apparatus applied to the system. The system includes a power sourcing equipment, a powered device, and a power supply line. The power sourcing equipment sends a second voltage to the powered device to determine a first voltage. The first voltage is a maximum power supply voltage agreed on by the power sourcing equipment and the powered device. The power sourcing equipment supplies power to the powered device based on the first voltage. In this application, the power sourcing equipment supplies power to the powered device based on the maximum power supply voltage that can be supported by the powered device, so that a loss on the power supply line is reduced. ## Claims ### Claim 1 A power supply management method, comprising: determining a first voltage, the first voltage being a maximum power supply voltage agreed on by a power sourcing equipment and a powered device; and supplying power to the powered device based on the first voltage. ### Claim 2 (depends on 1) The method according to claim 1, wherein the determining the first voltage comprises: determining a first current returned by the powered device to the power sourcing equipment, the first current being returned in response to a negotiation voltage sent by the power sourcing equipment to negotiate the first voltage with the powered device; and determining the first voltage based on the first current. ### Claim 3 (depends on 1) The method according to claim 1, the method further comprising: determining a second current returned by the powered device to the power sourcing equipment, the second current being returned in response to a third voltage sent by the power sourcing equipment to detect whether the powered device is a valid powered device; and determining whether the powered device is a valid powered device based on the second current. ### Claim 4 (depends on 3) The method according to claim 3, wherein the supplying power to the powered device based on the first voltage comprises: supplying, by the power sourcing equipment, power to the powered device based on the first voltage when the powered device is a valid powered device. ### Claim 5 (depends on 1) The method according to claim 1, the method further comprising: determining a third current returned by the powered device to the power sourcing equipment, the third current being returned in response to a fourth voltage sent by the power sourcing equipment for diameter detection; and determining a diameter of a power supply line between the power sourcing equipment and the powered device based on the third current. ### Claim 6 (depends on 1) The method according to claim 1, the method further comprising: stopping, by the power sourcing equipment, supplying power to the powered device when a port that is of the power sourcing equipment and that is connected to the powered device is overloaded. ### Claim 7 (depends on 6) The method according to claim 6, wherein that the port is overloaded comprises: a power supply voltage from the power sourcing equipment to the powered device exceeds the first voltage; or a power supply current from the power sourcing equipment to the powered device exceeds a preset power supply current. ### Claim 8 (depends on 6) The method according to claim 6, wherein the stopping, by the power sourcing equipment, supplying power to the powered device comprises: stopping, by the power sourcing equipment, supplying power to the powered device within predetermined time. ### Claim 9 (depends on 1) The method according to claim 1, further comprising: reducing, when power supply of the power sourcing equipment is abnormal by the power sourcing equipment, a voltage or a current for supplying power to the powered device. ### Claim 10 (depends on 2) The method according to claim 2, wherein the determining the first current comprises: determining a magnitude of a returned current based on the second voltage and a rated power of the powered device; and determining the first current based on the magnitude of the returned current. ### Claim 11 A power sourcing equipment, comprising: a current detection circuit, configured to determine a first voltage, wherein the first voltage is a maximum power supply voltage agreed on by the power sourcing equipment and a powered device; and a power supply circuit, configured to supply power to the powered device based on the first voltage. ### Claim 12 (depends on 11) The power sourcing equipment according to claim 11, wherein the current detection circuit is configured to: determine the first voltage based on a first current, wherein the first current is returned by the powered device to the power sourcing equipment in response to a second voltage sent by the power sourcing equipment to negotiate the first voltage with the powered device. ### Claim 13 (depends on 11) The power sourcing equipment according to claim 11, wherein the current detection circuit is further configured to: determine whether the powered device is a valid powered device based on a second current, wherein the second current is returned by the powered device to the power sourcing equipment in response to a third voltage sent by the power sourcing equipment to detect whether the powered device is a valid powered device. ### Claim 14 (depends on 13) The power sourcing equipment according to claim 13, wherein the power supply circuit is configured to: supply, by the power supply circuit, power to the powered device based on the first voltage when the powered device is a valid powered device. ### Claim 15 (depends on 11) The power sourcing equipment according to claim 11, wherein the current detection circuit is further configured to: determine a diameter of a power supply line between the power sourcing equipment and the powered device based on a third current, wherein the third current is returned by the powered device to the power sourcing equipment in response to a fourth voltage sent by the power sourcing equipment to detect the diameter. ### Claim 16 (depends on 11) The power sourcing equipment according to claim 11, wherein the power sourcing equipment further comprises: a protection circuit, configured to control the power supply circuit to stop supplying power to the powered device when a port that is of the power sourcing equipment and that is connected to the powered device is overloaded. ### Claim 17 (depends on 16) The equipment according to claim 16, wherein that the port is overloaded comprises: a power supply voltage from the power sourcing equipment to the powered device exceeds the first voltage; or a power supply current from the power sourcing equipment to the powered device exceeds a preset power supply current. ### Claim 18 (depends on 16) The power sourcing equipment according to claim 16, wherein the protection circuit is further configured to: stop supplying power to the powered device within predetermined time. ### Claim 19 (depends on 16) The power sourcing equipment according to claim 16, wherein the protection circuit is further configured to: reduce, when power supply of the power sourcing equipment is abnormal, a voltage or a current for supplying power to the powered device. ### Claim 20 A power supply system, comprising a power sourcing equipment, a powered device, wherein the power sourcing equipment is configured to couple to the powered device through a power supply line and configured to: determine a first voltage based a first current returned by the powered device in response to a second voltage sent by the power sourcing equipment to negotiate the first voltage with the powered device, the first voltage being a maximum power supply voltage agreed on by the power sourcing equipment and a powered device; and supply power through the power supply line to the powered device based on the first voltage.