Device and method for wirelessly transmitting power

摘要

There are provided a device and a method for wirelessly transmitting a power in which a power is wirelessly transmitted to a power receiving device with high transmission efficiency. The wireless power transmitting device includes a first power transmitting coil configured to transmit a first power signal, a second power transmitting coil that is concentrically layered with the first power transmitting coil to transmit a second power signal, and a power supply unit configured to supply alternating current powers to the first power transmitting coil and the second power transmitting coil so as to allow the first power signal and the second power signal to have a phase difference of 180°.

主权项

1. A wireless power transmitting device comprising:
a first power transmitting coil configured to transmit a first power signal; a second power transmitting coil configured to transmit a second power signal, the second power transmitting coil being concentrically layered with the first power transmitting coil; and a power supply unit configured to supply alternating current powers to the first power transmitting coil and the second power transmitting coil so as to allow the first power signal and the second power signal to have a phase difference of 180°, wherein the first and second power transmitting coils have the same size and the same winding number, and are wound in an opposite direction to each other, and wherein the power supply unit includes: a power transmitting controller configured to generate a single PWM (Pulse Width Modulation) control signal; and a series resonance converter configured to generate the alternating current powers in response to the single PWM control signal, and configured to apply the generated alternating current powers to the first and second power transmitting coils to cause the first power signal and a second power signal to have a phase difference of 180°.