CONTACTLESS ELECTRIC POWER FEEDING SYSTEM

摘要

Provided is a contactless electric power feeding system that allows a plurality of devices to be recharged at the same time. A feeding device includes a primary feeding coil and each receiving device includes a secondary receiving coil. Each coil forms a resonance circuit jointly with a capacitor, and the two resonance circuits are electro-magnetically coupled with each other to from a transmission circuit unit. A first impedance of an input end of the transmission circuit unit is matched with a second impedance of an output end of the transmission circuit unit by using a coupling efficient between the primary feeding coil and the secondary receiving coil, and the output impedance of a power supply unit for supplying electric power to the primary feeding coil is smaller than the first impedance.

主权项

1. A contactless electric power feeding device for feeding electric power to a power receiving device including a secondary receiving coil, comprising:
a primary feeding coil; an impedance control circuit electrically connected to the primary feeding coil; and a power supply unit configured to supply electric power to the primary feeding coil via the impedance control circuit; wherein a first impedance of an input end of a transmission circuit unit including the primary feeding coil and the second receiving coil is matched with a second impedance of an output end of the transmission circuit unit by using a coupling efficient between the primary feeding coil and the secondary receiving coil, and the output impedance of the power supply unit is smaller than the first impedance.