US 12,266,945 B2
Contactless power feed apparatus
Goro Nakao, Kyoto (JP); Yuki Ito, Kyoto (JP); and Taichi Mishima, Kyoto (JP)
Assigned to OMRON Corporation, Kyoto (JP)
Filed by OMRON Corporation, Kyoto (JP)
Filed on Sep. 6, 2023, as Appl. No. 18/461,536.
Claims priority of application No. 2022-167860 (JP), filed on Oct. 19, 2022.
Prior Publication US 2024/0136859 A1, Apr. 25, 2024
Prior Publication US 2024/0235266 A9, Jul. 11, 2024
Int. Cl. H02J 50/12 (2016.01); H02J 50/50 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 50/50 (2016.02)] 4 Claims
OG exemplary drawing
 
1. A contactless power feed apparatus, comprising:
a power transmission device;
a power reception device; and
a relay circuit, relaying power transmitted from the power transmission device to the power reception device in a contactless manner,
wherein the power transmission device comprises:
a transmission coil, transmitting AC power that is supplied to the relay circuit; and
a power supply circuit, converting DC power supplied from a DC power source into AC power having a predetermined frequency and supplying the AC power that is converted to the transmission coil,
wherein the relay circuit comprises:
a first coil, disposed to be electromagnetically coupled with the transmission coil and receiving the AC power from the transmission coil;
a second coil, transmitting the AC power that is received via the first coil to the power reception device; and
a resonant capacitor, resonating with the AC power supplied to the transmission coil together with the first coil and the second coil,
wherein the power reception device comprises:
a resonant circuit, having a reception coil receiving the AC power from the second coil by being electromagnetically coupled with the second coil of the relay circuit; and
a rectifying and smoothing circuit, rectifying and converting the AC power output from the resonant circuit into DC power, and outputting the DC power to a load circuit,
wherein the first coil of the relay circuit and the transmission coil of the power transmission device are wound on a same core.