# US 2017/0288462 A1 · Wireless Power Supply Device, Wireless Power Receiving Device 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 2017/0288462 A1 - Document ID: US20170288462A1 - Status: Published application - Kind: A1 - Application number: 15/444,929 - Filed: 2017-02-28 - Published: 2017-10-05 - Earliest claimed: 2016-03-30 - Assignees: MINEBEA MITSUMI Inc. - Applicants: Minebea Mitsumi Inc. - Inventors: Shinichi SUZUKI - Web page: https://patentgrep.com/patent/US20170288462A1 ## CPC - 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 - H02J 50/90: involving detection or optimisation of position, e.g. alignment - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A wireless power supply device including a power supply coil for wirelessly transmitting electric power to a power receiving device, a driving circuit for outputting pulse electric power for driving the power supply coil at the resonance frequency of the power receiving device to the power supply coil, a first radio module for receiving rectified voltage information about rectified voltage generated in the power receiving device via a radio communication path, and a control circuit for generating a driving control signal on the basis of the rectified voltage information received by the first radio module, thereby to control the driving circuit. ## Claims ### Claim 1 A wireless power supply device, comprising: a power supply coil for wirelessly transmitting electric power to a power receiving device; a driving circuit for outputting pulse electric power for driving the power supply coil at the resonance frequency of the power receiving device to the power supply coil; a first radio module for receiving rectified voltage information about rectified voltage generated in the power receiving device via a radio communication path; and a control circuit for generating a driving control signal on the basis of the rectified voltage information received by the first radio module, thereby to control the driving circuit. ### Claim 2 (depends on 1) The wireless power supply device according to claim 1, wherein the driving circuit is a full-bridge circuit and applies the pulse electric power to the power supply coil to pulse-drive the coil, and the control circuit variably controls on-duty of the pulse electric power on the basis of the rectified voltage information. ### Claim 3 (depends on 2) The wireless power supply device according to claim 2, wherein the pulse widths of gate signals of high-side switching elements and low-side switching elements of the driving circuit are equal to each other. ### Claim 4 (depends on 1) The wireless power supply device according to claim 1, further comprising an initial voltage control circuit for generating an initial voltage control signal and outputting the signal to the control circuit, when DC voltage is applied from a DC power supply, said signal allowing the rectified voltage to reach a first predetermined voltage, by which a second radio module of the power receiving device can operate, wherein the control circuit generates the driving control signal on the basis of the initial voltage control signal, so that the rectified voltage reaches the first predetermined voltage. ### Claim 5 (depends on 4) The wireless power supply device according to claim 4, further comprising a first regulator for converting the DC voltage applied from the DC power supply to first driving voltage and supplying the first driving voltage to the first radio module. ### Claim 6 (depends on 4) The wireless power supply device according to claim 4, wherein the power receiving device comprises a load which operates by application of a second predetermined voltage higher than the first predetermined voltage, and after the rectified voltage is set to the first predetermined voltage, the control circuit controls the driving circuit on the basis of the rectified voltage information, so that the rectified voltage generated in the power receiving device reaches the second predetermined voltage. ### Claim 7 (depends on 6) The wireless power supply device according to claim 6, wherein the initial voltage control circuit stops output of the initial voltage control signal on the basis of a control signal from the first radio module. ### Claim 8 (depends on 1) The wireless power supply device according to claim 1, wherein, when receiving an error signal from the power receiving device, the first radio module outputs a stop signal to the control circuit to stop generation of the driving control signal. ### Claim 9 A wireless power receiving device, comprising: a resonant circuit for generating resonant voltage, including a power receiving coil for wireles sly receiving electric power from a power supply device and a capacitor; a rectifying circuit for rectifying the resonant voltage to output rectified voltage; and a second radio module for generating rectified voltage information on the basis of the rectified voltage and transmitting the information to a first radio module of the power supply device. ### Claim 10 (depends on 9) The power receiving device according to claim 9, further comprising a load which operates by application of a second predetermined voltage higher than a first predetermined voltage, with which the second radio module can operate, wherein the load is activated or stops by a control signal output by the second radio module. ### Claim 11 (depends on 10) The wireless power receiving device according to claim 10, wherein, when the rectified voltage reaches the second predetermined voltage, the second radio module outputs an activation command signal to the load on the basis of activation command information from the first radio module, thereby to activate the load. ### Claim 12 (depends on 11) The wireless power receiving device according to claim 11, wherein the second radio module outputs a stop command signal to the load on the basis of stop command information from the first radio module, thereby to stop the load. ### Claim 13 (depends on 11) The wireless power receiving device according to claim 11, wherein, when a predetermined time has elapsed after the rectified voltage reaches the second predetermined voltage, the second radio module outputs an activation command signal to the load, thereby to activate the load. ### Claim 14 (depends on 9) The wireless power receiving device according to claim 9, further comprising a second regulator for converting the rectified voltage output by the rectifying circuit to second driving voltage and supplying the second driving voltage to the second radio module. ### Claim 15 (depends on 1) A wireless power transmission system, comprising the wireless power supply device according to claim 1 and a wireless power receiving device, comprising: a resonant circuit for generating resonant voltage, including a power receiving coil for wirelessly receiving electric power from a power supply device and a capacitor; a rectifying circuit for rectifying the resonant voltage to output rectified voltage; and a second radio module for generating rectified voltage information on the basis of the rectified voltage and transmitting the information to a first radio module of the power supply device. ### Claim 16 (depends on 15) The wireless power transmission system according to claim 15, wherein, after rectified voltage output by a rectifying circuit of the wireless power receiving device changes from a first predetermined voltage to a second predetermined voltage, if a state of deviating from a range containing the second predetermined voltage continues for a predetermined time, a second radio module of the wireless power receiving device transmits an error signal to the first radio module and, when receiving the error signal, the first radio module outputs a stop signal to the control circuit to stop power transmission. ### Claim 17 (depends on 16) The wireless power transmission system according to claim 16, wherein the first radio module and the second radio module communicate with each other via a radio communication path. ### Claim 18 (depends on 17) The wireless power transmission system according to claim 17, wherein both an electric field intensity of the first radio module and an electric field of the second radio module are equal to or lower than 35 μV/m.