Contactless power transfer apparatus

摘要

According to one embodiment, contactless power transfer apparatus includes: transmission coil; primary capacitor; reception coil opposing transmission coil through gap; and secondary capacitor. Specification of frequency of the transmission coil and that of the reception coil are equal. At least one of electrical power specification and gap length specification of the transmission coil differ from the reception coil. When the electrical power specification of the power transmission coil differ from that of the power reception coil, the power is supplied from the transmission coil to the reception coil by using smaller one of the power of the transmission coil and of the reception coil as maximum power. When the gap length specification of the transmission coil differs from that of the reception coil, the transmission coil opposes the reception coil through the gap length, which is the specification of the transmission coil.

主权项

1. A contactless power transfer apparatus comprising:
a power transmission coil; a primary side capacitor connected to the power transmission coil in series or parallel; a power reception coil opposing the power transmission coil through a gap; and a secondary side resonant capacitor connected to the power reception coil in parallel, wherein power is supplied from the power transmission coil to the power reception coil, the power transmission coil and the power reception coil includes:
a rectangular or H-shaped core having magnetic pole portions at both ends; anda wire wound around a core part between the magnetic pole portions, a specification of a power source frequency of the power transmission coil and a specification of a resonance frequency of the power reception coil are equal to each other, at least one of a specification of an electrical power and a specification of a gap length of the power transmission coil is different from corresponding specification of the power reception coil, when the specification of the electrical power of the power transmission coil and the specification of the electrical power of the power reception coil differ from each other, the power is supplied from the power transmission coil to the power reception coil by using smaller one of the electrical power of the power transmission coil and the electrical power of the power reception coil as a maximum electrical power capable of being supplied, and when the specification of the gap length of the power transmission coil and the specification of the gap length of the power reception coil differ from each other, the power is supplied by having the power transmission coil and the power reception coil oppose each other through the gap length, which is the specification of the power transmission coil.