# US 2019/0356153 A1 · Wireless Charging System, Wireless Charging Method, and Device To-Be-Charged > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356153 A1 - Document ID: US20190356153A1 - Status: Published application - Kind: A1 - Application number: 16/528,056 - Filed: 2019-07-31 - Published: 2019-11-21 - Earliest claimed: 2017-04-07 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Shiming Wan; Jialiang Zhang; Dongsun Yang; Shangbo Lin; Jiada Li - Web page: https://patentgrep.com/patent/US20190356153A1 ## CPC - H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones - H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries - H02J 7/445: {in response to measured battery parameters, e.g. voltage, current or temperature profile} - H02J 7/47: Arrangements for checking compatibility or authentication between one component, e.g. a battery or a battery charger, and another component, e.g. a power source - H02J 7/60: including safety or protection arrangements - H02J 7/65: against overtemperature - H02J 7/731: {specially adapted for holding portable devices containing batteries (H02J7/751 takes precedence)} - H02J 7/94: in response to battery current - H02J 7/977: {of the battery} - H02J 50/12: of the resonant type - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02M 3/07: using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} - H04B 5/24: Inductive coupling - H04B 5/79: for data transfer in combination with power transfer - H02J 50/10: using inductive coupling - H02J 2207/20: Charging or discharging characterised by the power electronics converter - H02J 2207/30: Charge provided using DC bus or data bus of a computer - Y02B 40/00: Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers - Y02E 60/10: Energy storage using batteries - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - 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) - H04B: TRANSMISSION - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Provided are a wireless charging system, a wireless charging method, and a device to-be-charged. The wireless charging system includes a wireless charging device and a device to-be-charged. The wireless charging device is configured to conduct wireless communication with the device to-be-charged through communication control circuits to adjust a transmission power of the wireless charging device. In addition, the device to-be-charged has a step-down circuit. ## Claims ### Claim 1 A wireless charging system, comprising a wireless charging device and a device to-be-charged, wherein the wireless charging device comprises: a wireless transmitting circuit, configured to transmit an electromagnetic signal to charge the device to-be-charged wirelessly; and a first communication control circuit, configured to conduct wireless communication with the device to-be-charged during wireless charging; the device to-be-charged comprises: a battery; a wireless receiving circuit, configured to receive the electromagnetic signal and convert the electromagnetic signal into an output voltage and an output current of the wireless receiving circuit; a step-down circuit, configured to receive and decrease the output voltage of the wireless receiving circuit to obtain an output voltage and an output current of a first charging channel, wherein the output voltage and the output current of the first charging channel is provided to the battery for charging; a detecting circuit, configured to detect at least one of a voltage and a current in the first charging channel; and a second communication control circuit, configured to conduct wireless communication with the first communication control circuit according to the at least one of the voltage and the current in the first charging channel detected by the detecting circuit, whereby the first communication control circuit adjusts a transmission power of the wireless transmitting circuit to make at least one of an output voltage and an output current of the first charging channel match at least one of a charging voltage and a charging current currently required by the battery. ### Claim 2 A device to-be-charged, comprising: a battery; a wireless receiving circuit, configured to receive an electromagnetic signal from a wireless charging device and convert the electromagnetic signal into an output voltage and an output current of the wireless receiving circuit; a step-down circuit, configured to receive and decrease the output voltage of the wireless receiving circuit to obtain an output voltage and an output current of a first charging channel, wherein the output voltage and the output current of the first charging channel is provided to the battery for charging; a detecting circuit, configured to detect at least one of a voltage and a current in the first charging channel; and a communication control circuit, configured to conduct wireless communication with the wireless charging device according to the at least one of the voltage and the current in the first charging channel detected by the detecting circuit, wherein the wireless charging device is configured to adjust a transmission power of the wireless charging device according to the wireless communication, to make at least one of an output voltage and an output current of the first charging channel match at least one of a charging voltage and a charging current currently required by the battery. ### Claim 3 (depends on 2) The device to-be-charged of claim 2, wherein the step-down circuit is a Buck circuit or a charge pump. ### Claim 4 (depends on 2) The device to-be-charged of claim 2, wherein the communication control circuit configured to conduct wireless communication with the wireless charging device according to the at least one of the voltage and the current in the first charging channel detected by the detecting circuit is configured to: send adjustment information to the wireless charging device, wherein the adjustment information is for instructing the wireless charging device to adjust at least one of an output voltage and an output current of a power supply device. ### Claim 5 (depends on 2) The device to-be-charged of claim 2, wherein the present charging stage of the battery comprises at least one of a trickle charging stage, a constant-voltage charging stage, and a constant-current charging stage. ### Claim 6 (depends on 5) The device to-be-charged of claim 5, wherein communication control circuit configured to conduct wireless communication with the wireless charging device according to the at least one of the voltage and the current in the first charging channel detected by the detecting circuit, whereby the wireless charging device adjusts the transmission power of the wireless charging device to make the at least one of the output voltage and the output current of the first charging channel match the at least one of the charging voltage and the charging current currently required by the battery is configured to: in the constant-voltage charging stage of the battery, conduct wireless communication with the wireless charging device according to the at least one of the voltage and the current in the first charging channel detected by the detecting circuit, whereby the wireless charging device adjusts the transmission power of the wireless charging device to make the output voltage of the first charging channel match a charging voltage corresponding to the constant-voltage charging stage. ### Claim 7 (depends on 5) The device to-be-charged of claim 5, wherein communication control circuit configured to conduct wireless communication with the wireless charging device according to the at least one of the voltage and the current in the first charging channel detected by the detecting circuit, whereby the wireless charging device adjusts the transmission power of the wireless charging device to make the at least one of the output voltage and the output current of the first charging channel match the at least one of the charging voltage and the charging current currently required by the battery is configured to: in the constant-current charging stage of the battery, conduct wireless communication with the wireless charging device according to the at least one of the voltage and the current in the first charging channel detected by the detecting circuit, whereby the wireless charging device adjusts the transmission power of the wireless charging device to make the output current of the first charging channel match a charging current corresponding to the constant-current charging stage. ### Claim 8 (depends on 2) The device to-be-charged of claim 2, wherein the communication control circuit is further configured to send battery-state information to the wireless charging device, whereby the wireless charging device adjusts the transmission power of the wireless charging device according to the battery-state information, wherein the battery-state information comprises at least one of a present power and a present voltage of the battery of the device to-be-charged. ### Claim 9 (depends on 2) The device to-be-charged of claim 2, wherein information communicated between the communication control circuit and the wireless charging device comprises at least one of: temperature information of the battery; information indicative of a peak value or an average value of at least one of a charging voltage and a charging current of the battery; information indicative of over-voltage protection or over-current protection; and power-delivery efficiency information indicative of efficiency in power delivery between the wireless charging device and the wireless receiving circuit. ### Claim 10 (depends on 2) The device to-be-charged of claim 2, further comprising: a second charging channel, provided with a converting circuit, wherein the converting circuit is configured to receive the output voltage and the output current of the wireless receiving circuit and conduct at least one of a constant-voltage control and a constant-current control on at least one of the output voltage and the output current of the wireless receiving circuit, to make at least one of an output voltage and an output current of the second charging channel match the at least one of the charging voltage and the charging current currently required by the battery, wherein the battery is charged according to the at least one of the output voltage and the output current of the second charging channel; wherein the communication control circuit is further configured to control switching between the first charging channel and the second charging channel. ### Claim 11 (depends on 10) The device to-be-charged of claim 10, wherein the communication control circuit is further configured to conduct handshake communication with the wireless charging device and control the first charging channel to work when the handshake communication succeeds, or control the second charging channel to work when the handshake communication fails. ### Claim 12 (depends on 10) The device to-be-charged of claim 10, wherein the communication control circuit is further configured to control switching between the first charging channel and the second charging channel according to a temperature of the battery. ### Claim 13 (depends on 2) The device to-be-charged of claim 2, wherein the current in the first charging channel is a pulsating DC, and the detecting circuit comprises: a sample-and-hold circuit, configured to sample the pulsating DC when the sample-and-hold circuit is in a sample state and hold a peak current of the pulsating DC when the sample-and-hold circuit is in a hold state; and wherein the communication control circuit is further configured to determine whether the sample-and-hold circuit is in the hold state and to obtain the peak current of the pulsating DC held by the sample-and-hold circuit based on a determination that the sample-and-hold circuit is in the hold state. ### Claim 14 (depends on 13) The device to-be-charged of claim 13, wherein the sample-and-hold circuit comprises a capacitor, and the sample-and-hold circuit is configured to hold the peak current of the pulsating DC based on the capacitor of the sample-and-hold circuit; and the detecting circuit further comprises a discharge circuit, and the communication control circuit is further configured to release electric charges across the capacitor of the sample-and-hold circuit via the discharge circuit to make the sample-and-hold circuit switch to the sample state from the hold state. ### Claim 15 (depends on 2) The device to-be-charged of claim 2, wherein the wireless charging device is operable in a first wireless charging mode or in a second wireless charging mode, and a charging speed at which the wireless charging device charges the device to-be-charged in the first wireless charging mode is higher than in the second wireless charging mode; the communication control circuit is further configured to: communicate with the wireless charging device to negotiate for use of the first wireless charging mode and the second wireless charging mode for wireless charging. ### Claim 16 A method for wirelessly charging a device to-be-charged, comprising: receiving, with a wireless receiving circuit, an electromagnetic signal from a wireless charging device, and converting the electromagnetic signal into an output voltage and an output current of the wireless receiving circuit; decreasing the output voltage of the wireless charging circuit to obtain an output voltage and an output current of a first charging channel of the device to-be-charged, and charging a battery according to the output voltage and the output current of the wireless receiving circuit; detecting at least one of a voltage and a current in the first charging channel; and conducting wireless communication with the wireless charging device according to the at least one of the voltage and the current detected in the first charging channel, wherein the wireless charging device is configured to adjust a transmission power of the wireless charging device according to the wireless communication, to make at least one of an output voltage and an output current of the first charging channel match at least one of a charging voltage and a charging current currently required by the battery. ### Claim 17 (depends on 16) The method of claim 16, wherein conducting wireless communication with the wireless charging device according to the at least one of the voltage and the current detected in the first charging channel comprising: sending adjustment information to the wireless charging device, wherein the adjustment information is for instructing the wireless charging device to adjust at least one of an output voltage and an output current of a power supply device. ### Claim 18 (depends on 16) The method of claim 16, further comprising: sending battery-state information to the wireless charging device, whereby the wireless charging device adjusts the transmission power of the electromagnetic signal according to the battery-state information, wherein the battery-state information comprises at least one of a present power and a present voltage of the battery. ### Claim 19 (depends on 16) The method of claim 16, further comprising: conducting at least one of a constant-voltage control and a constant-current control on at least one of the output voltage and the output current of the wireless receiving circuit to obtain an output voltage and an output current of a second charging channel, to make the output voltage and the output current of the second charging channel match the at least one of the charging voltage and the charging current currently required by the battery, and charging the battery according to the at least one of the output voltage and the output current of the second charging channel; and controlling switching between the first charging channel and the second charging channel. ### Claim 20 (depends on 19) The method of claim 19, further comprising at least one of: conducting handshake communication with the wireless charging device and controlling the first charging channel to work when the handshake communication succeeds, or controlling the second charging channel to work when the handshake communication fails; and controlling switching between the first charging channel and the second charging channel according to temperature of the battery.