POWER TRANSMISSION SYSTEM

摘要

A power transmitting unit-side resonance circuit including a resonance capacitor connected in series to a power transmitting coil and a power receiving unit-side resonance circuit including a resonance capacitor connected in series to a power receiving coil are caused to resonate with each other so that each resonance circuit resonates. With this, power is transmitted between the power transmitting coil and the power receiving unit making use of magnetic field resonance coupling and electric field resonance coupling. By making use of resonance, only effective power is transmitted from the power transmitting unit side to the power receiving unit side, while reactive power that is reflected is reserved as resonance energy in each resonance circuit.

主权项

1. A power transmission system comprising:
a power transmitting unit having a power transmitting coil; and a power receiving unit having a power receiving coil, the power transmitting unit including:
a power transmitting unit-side resonance capacitor configuring a power transmitting unit-side resonance circuit along with the power transmitting coil; and a power transmitting unit-side alternating current generation circuit electrically connected with the power transmitting coil, including a switching circuit configured of a parallel connection circuit in which a switching element, a diode, and a capacitor are connected in parallel, and an inductor having a value of inductance making it possible to form a current source, from an inputted direct-current voltage, taken as a direct current in comparison with an alternating current that is flowed in the power transmitting coil, so as to generate the alternating current to be flowed in the power transmitting coil, the power receiving unit including:
a power receiving unit-side resonance capacitor configuring a power receiving unit-side resonance circuit along with the power receiving coil; anda power receiving unit-side rectification circuit connected with the power receiving coil and rectifying an alternating current generated on the power receiving coil, an electromagnetic field resonance coupling circuit configured with mutual inductance and mutual capacitance being equivalently formed between the power transmitting coil and the power receiving coil so that the power transmitting unit-side resonance circuit and the power receiving unit-side resonance circuit resonate with each other to transmit power from the power transmitting unit to the power receiving unit, energy that is reflected without being transmitted from the power transmitting unit being taken as reactive power and reserved as resonance energy in the power transmitting unit-side resonance circuit, and of the energy received by the power receiving unit, energy that is reflected without being supplied to output is taken as reactive power and reserved as resonance energy in the power receiving unit-side resonance circuit.