WIRELESS POWER-SUPPLYING SYSTEM

• Main Authors: ARAKI, Jun, NAKAMURA, Toshio, MURAYAMA, Takahiko
• Format: Patent
• Language: English; French; German
• Published: 31.07.2019
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY-PROPELLED VEHICLES; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL

A wireless power-supplying system (100) according to the present disclosure includes a power-transmitting device (101) and a power-receiving device (103), in which the power-transmitting device includes a power-transmitting coil (113) to which AC power of a certain frequency is input from a power supply (111) and a controller which controls a frequency, the power-receiving device includes a power-receiving coil (121) magnetically coupled with the power-transmitting coil with a certain coupling coefficient and a power-receiving side series element (123) connected to the power-receiving coil in series and having imaginary impedance jZ, the imaginary impedance is defined so that impedance when a power-receiving side is seen from the power supply is independent of the coupling coefficient when the frequency and the coupling coefficient are predetermined values, and the controller changes the frequency according to at least one of power-transmitting status information of the power-transmitting device and power-receiving status information of the power-receiving device when the coupling coefficient changes.