# US 8,542,018 B2 · Power transmitting apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,018 B2 - Document ID: US8542018B2 - Status: Granted - Kind: B2 - Application number: 12/723,865 - Filed: 2010-03-15 - Published: 2010-09-30 - Granted: 2013-09-24 - Earliest claimed: 2009-03-31 - Assignees: Fujitsu Limited - Applicants: Hiroyasu Yoshikawa - Inventors: Hiroyasu Yoshikawa - Web page: https://patentgrep.com/patent/US8542018B2 ## CPC - G01R 33/3642: {Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A power transmitting apparatus includes: a first magnetic resonance coil that externally transmits power as energy through magnetic resonance; a first power transmitting-and-receiving unit that supplies power to at least the first magnetic resonance coil; a second magnetic resonance coil that accepts the magnetic field energy through magnetic resonance occurring between the first magnetic resonance coil and the second magnetic resonance coil; a second power transmitting-and-receiving unit that accepts the power at least with reference to the second magnetic resonance coil; a main power supply; and a power supply-management unit configured to select either the power accepted by the second power transmitting-and-receiving unit or power transmitted from the main power supply, and transmit the selected power to the first power transmitting-and-receiving unit and/or transmit the power accepted by the second power transmitting-and-receiving unit and the power transmitted from the main power supply to the first power transmitting-and-receiving unit in combination. ## Claims ### Claim 1 A power transmitting apparatus comprising: a first magnetic resonance coil configured to externally transmit power as magnetic field energy through magnetic resonance; a first power transmitting-and-receiving unit configured to supply power to at least the first magnetic resonance coil; a second magnetic resonance coil configured to accept the magnetic field energy through magnetic resonance occurring between the first magnetic resonance coil and the second magnetic resonance coil; a second power transmitting-and-receiving unit configured to accept the power at least with reference to the second magnetic resonance coil; a main power supply; a power supply-management unit configured to select (a) either the power accepted by the second power transmitting-and-receiving unit or power transmitted from the main power supply, and transmit the selected power to the first power transmitting-and-receiving unit, and/or (b) transmit the power accepted by the second power transmitting-and-receiving unit and the power transmitted from the main power supply to the first power transmitting-and-receiving unit in combination; and a power backflow path provided to entirely electrically connect between the second power transmitting-and-receiving unit and the power supply-management unit; wherein the first power transmitting-and-receiving unit receives the power accepted by the second power transmitting-and-receiving unit without the second magnetic resonance coil. ### Claim 2 (depends on 1) The power transmitting apparatus according to claim 1, further comprising an operation switching unit configured to supply power based on power transmitted via power backflow path and power from the main power supply. ### Claim 3 (depends on 2) The power transmitting apparatus according to claim 2, further comprising a driving unit, coupled to the main power supply, configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when a plurality of peak driving frequencies are detected by a frequency sweep processing unit. ### Claim 4 (depends on 1) The power transmitting apparatus according to claim 1, further comprising an operation switching unit configured to switch between a main power transmitting operation performed to transmit magnetic energy from the first magnetic resonance coil to the second magnetic resonance coil and a backflow operation performed to transmit magnetic energy from the second magnetic resonance coil to the first magnetic resonance coil, wherein the second power transmitting-and-receiving unit supplies power accepted when the main power transmitting operation is performed to the second magnetic resonance coil when the backflow operation is performed, wherein the first power transmitting-and-receiving unit accepts power transmitted from the first magnetic resonance coil when the backflow operation is performed, and wherein the power supply-management unit selects either the power supplied from the main power supply or the power accepted when the backflow operation is performed for use when the main power transmitting operation is performed and/or uses the power supplied from the main power supply and the power accepted when the backflow operation is performed in combination when the main power transmitting operation is performed. ### Claim 5 (depends on 4) The power transmitting apparatus according to claim 4, wherein each of the first and second power transmitting-and-receiving units is an electromagnetic induction coil configured to supply and/or extract power through electromagnetic induction. ### Claim 6 (depends on 4) The power transmitting apparatus according to claim 4, further comprising a driving unit, coupled to the main power supply, configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when a plurality of peak driving frequencies are detected by a frequency sweep processing unit. ### Claim 7 (depends on 1) The power transmitting apparatus according to claim 1, wherein each of the first and second power transmitting-and-receiving units is an electromagnetic induction coil configured to supply and/or extract power through electromagnetic induction. ### Claim 8 (depends on 7) The power transmitting apparatus according to claim 7, further comprising a driving unit, coupled to the main power supply, configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when a plurality of peak driving frequencies are detected by a frequency sweep processing unit. ### Claim 9 (depends on 2) The power transmitting apparatus according to claim 2, wherein each of the first and second power transmitting-and-receiving units is an electromagnetic induction coil configured to supply and/or extract power through electromagnetic induction. ### Claim 10 (depends on 1) The power transmitting apparatus according to claim 1, further comprising a driving unit, coupled to the main power supply, configured to achieve the magnetic resonance at a driving frequency attained on a low frequency-side when a plurality of peak driving frequencies are detected by a frequency sweep processing unit. ### Claim 11 A power transmitting apparatus comprising: a first magnetic resonance coil configured to externally transmit power as magnetic field energy through magnetic resonance; a first power transmitting-and-receiving unit configured to supply power to at least the first magnetic resonance coil; a second magnetic resonance coil configured to accept the magnetic field energy through magnetic resonance occurring between the first magnetic resonance coil and the second magnetic resonance coil; a second power transmitting-and-receiving unit configured to accept the power at least with reference to the second magnetic resonance coil; a main power supply; a power supply-management unit configured to select (a) either the power accepted by the second power transmitting-and-receiving unit or power transmitted from the main power supply, and transmit the selected power to the first power transmitting-and-receiving unit, and/or (b) transmit the power accepted by the second power transmitting-and-receiving unit and the power transmitted from the main power supply to the first power transmitting-and-receiving unit in combination; and an operation switching unit configured to switch between a main power transmitting operation performed to transmit magnetic energy from the first magnetic resonance coil to the second magnetic resonance coil and a backflow operation performed to transmit magnetic energy from the second magnetic resonance coil to the first magnetic resonance coil, wherein the second power transmitting-and-receiving unit supplies power accepted when the main power transmitting operation is performed to the second magnetic resonance coil when the backflow operation is performed, wherein the first power transmitting-and-receiving unit accepts power transmitted from the first magnetic resonance coil when the backflow operation is performed, and wherein the power supply-management unit selects either the power supplied from the main power supply or the power accepted when the backflow operation is performed for use when the main power transmitting operation is performed and/or uses the power supplied from the main power supply and the power accepted when the backflow operation is performed in combination when the main power transmitting operation is performed.