# US 2019/0245362 A1 · Charging Protection Method, Terminal, and Charger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0245362 A1 - Document ID: US20190245362A1 - Status: Published application - Kind: A1 - Application number: 16/328,951 - Filed: 2016-08-29 - Published: 2019-08-08 - Earliest claimed: 2016-08-29 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Fenwei ZHANG; Haitao TIAN - Web page: https://patentgrep.com/patent/US20190245362A1 ## CPC - H02H 3/305: {involving current comparison} - H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries - H02J 7/60: including safety or protection arrangements - H02J 7/975: {in response to temperature} - H02H 1/0061: {concerning transmission of signals (transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26)} - Y02E 60/10: Energy storage using batteries - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract This application provides a charging protection method, a terminal, and a charger. The terminal obtains a parameter from the charger, including at least one of an input voltage value and an output current value of the charger and a temperature value of a charging output port of the charger. When a parameter value is greater than a threshold, the terminal terminates a charging process based on a relationship between a corresponding threshold and at least one of a difference between the output current value of the charger and an input current value of the terminal, a power loss from the charger to the terminal, and a temperature value (including the temperature value of the charging output port of the charger and a temperature value of a charging input port of the terminal). A charging port can be prevented from being overheated, and a probability that an overheated charging port causes an accident can be effectively decreased. ## Claims ### Claim at position 1 1-31. (canceled) ### Claim 32 A charging protection method for a process in which a charger charges a terminal, comprising: receiving, by the terminal, an output current value of the charger sent by the charger; obtaining, by the terminal, an input current value of the terminal; and when a difference between the output current value of the charger and the input current value of the terminal is greater than a protection current threshold, terminating, by the terminal, the process in which the charger charges the terminal. ### Claim 33 (depends on 32) The method according to claim 32, before the terminating, by the terminal, the process in which the charger charges the terminal, further comprising: sending out, by the terminal, prompt information when the difference is greater than a warning current threshold, wherein the warning current threshold is less than the protection current threshold. ### Claim 34 (depends on 32) The method according to claim 32, wherein the terminating, by the terminal, the process in which the charger charges the terminal comprises: instructing, by the terminal, the charger to terminate charging the terminal; or terminating, by the terminal, the charging process. ### Claim 35 (depends on 32) The method according to claim 32, wherein before receiving the output current value sent by the charger, the method further comprises: sending a current obtaining request to the charger. ### Claim 36 A charging protection method, comprising: obtaining, by a terminal, a power loss in a process in which a charger charges the terminal; and when the power loss is greater than a protection power threshold, terminating, by the terminal, the process in which the charger charges the terminal. ### Claim 37 A terminal, comprising: a receiver, configured to obtain an output current value of a charger in a process in which the charger charges the terminal; and a processor, configured to: when a difference between the output current value of the charger and an input current value of the terminal is greater than a protection current threshold, terminate the process in which the charger charges the terminal. ### Claim 38 (depends on 37) The terminal according to claim 37, wherein the processor is further configured to: before terminating the process in which the charger charges the terminal, send out prompt information when the difference is greater than a warning current threshold, wherein the warning current threshold is less than the protection current threshold. ### Claim 39 (depends on 37) The terminal according to claim 37, wherein the processor is configured to: instruct the charger to terminate charging the terminal; or terminate the charging process of the terminal. ### Claim 40 (depends on 37) The terminal according to claim 37, wherein the terminal comprises: a transmitter, configured to send a current obtaining request to the charger. ### Claim 41 A terminal, comprising: a receiver, configured to obtain an output current value and an output voltage value of a charger in a process in which the charger charges the terminal; and a processor, configured to: obtain, based on the output current value and the output voltage value of the charger, a power loss in the process in which the charger charges the terminal, and when the power loss is greater than a protection power threshold, terminate the process in which the charger charges the terminal. ### Claim 42 (depends on 41) The terminal according to claim 41, wherein the processor is configured to obtain the power loss by calculating a difference between a first power value and a second power value, wherein the first power value is a product of the output current value of the charger and the output voltage value of the charger, and the second power value is a product of an input current value of the terminal and an input voltage value of the terminal. ### Claim 43 (depends on 41) The terminal according to claim 41, wherein the processor is configured to obtain the power loss (Pc) by calculating Pc=(Ua−Ub)×Ia+(Ub−Ubattery)χIbattery, wherein Ua is the output voltage value of the charger, Ub is an input voltage value of the terminal, Ia is the output current value of the charger, Ubattery is a voltage value on both ends of a battery of the terminal, and Ibattery is a current value of the battery of the terminal. ### Claim 44 (depends on 41) The terminal according to claim 41, wherein the processor is further configured to: before terminating the process in which the charger charges the terminal, send out prompt information when the power loss is greater than a warning power threshold, wherein the warning power threshold is less than the protection power threshold. ### Claim 45 (depends on 41) The terminal according to claim 41, wherein the processor is configured to: instruct the charger to terminate charging the terminal; or terminate the charging process of the terminal. ### Claim 46 The terminal according to 41, wherein the processor is configured to: instruct the charger to terminate charging the terminal; or terminate the charging process of the terminal.