US 12,322,980 B2
Power supply system
Yusei Nakayashiki, Kariya (JP); Masaya Takahashi, Kariya (JP); Nobuhisa Yamaguchi, Kariya (JP); and Eisuke Takahashi, Kariya (JP)
Assigned to DENSO CORPORATION, Aichi-pref. (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Nov. 29, 2023, as Appl. No. 18/522,429.
Application 18/522,429 is a continuation of application No. PCT/JP2022/016803, filed on Mar. 31, 2022.
Claims priority of application No. 2021-090828 (JP), filed on May 31, 2021; and application No. 2022-058371 (JP), filed on Mar. 31, 2022.
Prior Publication US 2024/0097496 A1, Mar. 21, 2024
Int. Cl. H02J 50/12 (2016.01); B60L 53/122 (2019.01); B60L 53/62 (2019.01); H02J 50/90 (2016.01)
CPC H02J 50/12 (2016.02) [B60L 53/122 (2019.02); B60L 53/62 (2019.02); H02J 50/90 (2016.02)] 21 Claims
OG exemplary drawing
 
1. A power supply system for supplying electric power to a traveling vehicle in a wireless manner, the power supply system comprising:
a power transmission circuit which includes, on a ground side, a power transmission coil and a capacitor and whose impedance is switchable between a first impedance and a second impedance that is lower than the first impedance;
a high frequency generation circuit connected with the power transmission circuit to supply high-frequency electric power of a predetermined frequency to the power transmission coil of the power transmission circuit;
a measurement unit that measures a physical quantity corresponding to a degree of coupling between the power transmission circuit and a power reception circuit that includes a power reception coil provided in the vehicle; and
a control unit that controls transmission of electric power from the power transmission circuit to the power reception circuit,
wherein:
when the degree of coupling is determined, based on the measured physical quantity, to be lower than a predetermined degree, the control unit sets the power transmission circuit supplied with the high-frequency electric power to a first state that is a non-resonant state by setting the impedance of the power transmission circuit to the first impedance; and
when the degree of coupling is determined, based on the measured physical quantity, to be higher than or equal to the predetermined degree, the control unit sets the power transmission circuit supplied with the high-frequency electric power to a second state that is a resonant state by setting the impedance of the power transmission circuit to the second impedance.