# US 11,909,229 B2 · Wireless power transmission receiving circuit, communication method, and wireless power transmission system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,229 B2 - Document ID: US11909229B2 - Status: Granted - Kind: B2 - Application number: 17/415,731 - Filed: 2019-12-05 - Published: 2022-03-03 - Granted: 2024-02-20 - Earliest claimed: 2018-12-20 - Assignees: Guangdong Midea White Home Appliance Technology Innovation Center Co., Ltd.; Midea Group Co., Ltd. - Applicants: Guangdong Midea White Home Appliance Technology Innovation Center Co., Ltd.; Midea Group Co., Ltd. - Inventors: Shouliang Gu; Kunren Yin; Yuanyang Zuo; Sanying Yu; Junfeng Hou - Web page: https://patentgrep.com/patent/US11909229B2 ## CPC - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J 50/12: of the resonant type - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A wireless power transmission system includes: an electrical energy-receiving oscillation circuit including an electrical energy-receiving coil L2 and a compensation capacitor C2 connected in series, the electrical energy-receiving coil L2 sensing an alternating magnetic field and generating an induction current accordingly; a rectifier circuit connected to two ends of the electrical energy-receiving oscillation circuit; and a modulation circuit including multiple modulation sub-circuits, each of the modulation sub-circuits being separately connected to the electrical energy-receiving oscillation circuit, and the modulation circuit receiving a drive signal used to select a modulation sub-circuit matching a power level of a load of the wireless power transmission receiving circuit to operate, and the modulation sub-circuits receive, during a communication process, a communication signal and load the communication signal on a carrier signal to perform modulation. ## Claims ### Claim 1 A wireless power transmission receiving circuit, comprising: an electrical energy-receiving oscillation circuit, comprising an electrical energy-receiving coil and a compensation capacitor connected in series, wherein the electrical energy-receiving coil is configured to induct an alternating magnetic field to generate an induction current; a rectifier circuit, connected to a first and second end of the electrical energy-receiving oscillation circuit to rectify the induction current into a direct current, enabling the direct current to flow to a load; a modulation circuit, comprising a plurality of modulation sub-circuits, wherein each of the plurality of modulation sub-circuits is respectively connected to the electrical energy-receiving oscillation circuit, the modulation circuit is configured to receive a drive signal to select a modulation sub-circuit corresponding to a power level of the load of the wireless power transmission receiving circuit for operation, and during communication, the modulation sub-circuit is configured to receive a communication signal and load the communication signal on a carrier signal for modulation, wherein the carrier signal is provided by the electrical energy-receiving oscillation circuit. ### Claim 2 (depends on 1) The wireless power transmission receiving circuit according to claim 1, wherein each of the plurality of modulation sub-circuits comprises two modulation capacitors and a triode, the two modulation capacitors are connected in series and further connected to the electrical energy-receiving oscillation circuit in parallel, a node between connected ends of the two modulation capacitors is connected to a collector of the triode, an emission set of the triode is connected to the ground, the drive signal and the communication signal are received by a base electrode of the triode; two modulation capacitors of each of the modulation sub-circuits have a same capacitance value, and the two modulation capacitors of one of the plurality of the modulation sub-circuits are different from those of another one of the plurality of the modulation sub-circuits. ### Claim 3 (depends on 2) The wireless power transmission receiving circuit according to claim 2, wherein the modulation circuit comprises a first modulation sub-circuit and a second modulation sub-circuit, the first modulation sub-circuit is configured to receive a first drive signal, and the second modulation sub-circuit is configured to receive a second drive signal; when the power level of the load is a first level, the first drive signal is configured to drive the first modulation sub-circuit to operate; when the power level of the load is a second level, the second drive signal is configured to drive the second modulation sub-circuit to operate; when the power level of the load is a third level, the first drive signal is configured to drive the first modulation sub-circuit to operate and the second signal driving to drive the second modulation sub-circuit to operate. ### Claim 4 (depends on 1) The wireless power transmission receiving circuit according to claim 1, wherein the rectifier circuit comprises: a first rectifier sub-circuit, comprising two diodes connected in series, wherein a node between the two diodes of the first rectifier sub-circuit is connected to an output of the electrical energy-receiving oscillation circuit, and a first end of each of the two diodes is connected to two ends of the load respectively; a second rectifier sub-circuit, comprising another two diodes connected in parallel, wherein a node between the another two diodes of the second rectifier sub-circuit is connected to the first end of the electrical energy-receiving oscillation circuit, and a second end of each of the another two diodes is connected to the two ends of the load respectively; wherein one end of the load is connected to ground. ### Claim 5 (depends on 1) A wireless power transmission system comprising a wireless power transmission transmitter circuit according to claim 1, wherein the wireless power transmission receiving circuit is configured to receive electrical energy transmitted from the wireless power transmission transmitter circuit. ### Claim 6 (depends on 5) The wireless power transmission system according to claim 5, wherein the wireless power transmission transmitter circuit comprises: an electrical energy-transmitting oscillation circuit, configured to receive the electrical energy to generate the alternating magnetic field to wirelessly charge the wireless power transmission receiving circuit; a demodulation circuit, connected to the electrical energy-transmitting oscillation circuit, configured to demodulate the carrier signal of a electrical energy-transmitting circuit to acquire the communication signal; a controller, electrically connected to the demodulation circuit, configured to receive the communication signal to adjust an output power of a power of the wireless power transmission transmitter circuit. ### Claim 7 A communication method of a wireless power transmission receiving circuit comprising: acquiring a current power level of the wireless power transmission receiving circuit; and selecting one modulation sub-circuit or combination of a plurality of modulation sub-circuits corresponding to a power level of the wireless power transmission receiving circuit for operation based on the current power level of the wireless power transmission receiving circuit. ### Claim 8 (depends on 7) The communication method according to claim 7, wherein the wireless power transmission receiving circuit comprises a first modulation sub-circuit and a second modulation sub-circuit, the first modulation sub-circuit is configured to receive a first drive signal, and the second modulation sub-circuit is configured to receive a second drive signal. ### Claim 9 (depends on 8) The communication method according to claim 8, wherein the selecting of the one modulation sub-circuit or combination of a plurality of modulation sub-circuits corresponding to the power level of the wireless power transmission receiving circuit for operation based on the current power level of the wireless power transmission receiving circuit, comprises: determining the current power level of the wireless power transmission receiving circuit being a first level, wherein the first drive signal is configured to drive the first modulation sub-circuit to operate. ### Claim 10 (depends on 8) The communication method according to claim 8, wherein the selecting one modulation sub-circuit or combination of a plurality of modulation sub-circuits corresponding to the power level of the wireless power transmission receiving circuit for operation based on the current power level of the wireless power transmission receiving circuit, comprises: determining the current power level of the wireless power transmission receiving circuit as a second level, wherein the second drive signal is configured to drive the second modulation sub-circuit to operate. ### Claim 11 (depends on 8) The communication method according to claim 8, wherein the selecting one modulation sub-circuit or combination of a plurality of modulation sub-circuits corresponding to the power level of the wireless power transmission receiving circuit for operation based on the current power level of the wireless power transmission receiving circuit, comprises: determining the current power level of the wireless power transmission receiving circuit as a third level, wherein the first drive signal is configured to drive the first modulation sub-circuit to operate and the second drive signal is configured to drive the second modulation sub-circuit to operate.