Wireless charging system of using multi-frequency for wireless charging at long and short distance
Disclosed is a wireless charging system of using multi-frequency including at least one transmitter and at least one receiver which is wirelessly charged by the at least one transmitter, wherein the at least one transmitter includes a signal generator configured to generate a power signal of each of a plurality of frequency bands; a plurality of matching units connected to the signal generator matching and outputting the power signal of each of the plurality of frequency bands; and at least one antenna connected to the plurality of matching units transmitting the power signal of each of the plurality of frequency bands to each of at least one receiver, and wherein the at least one receiver includes at least one antenna receiving a power signal of each of a plurality of frequency bands from each of at least one transmitter; a plurality of matching units connected to the at least one antenna matching and outputting the power signal of each of the plurality of frequency bands; and a plurality of rectifiers connected to the plurality of matching units rectifying AC power applied to the power signal of each of the plurality of frequency bands to DC power.
1. At least one transmitter used in a wireless charging system of using multi-frequency, the at least one transmitter comprising:
a signal generator configured to generate a power signal of a respective one of a plurality of frequency bands;
a plurality of matching units connected to the signal generator configured to match and output the power signal of a respective one of the plurality of frequency bands; and
a single antenna connected to the plurality of matching units configured to transmit the power signal of a respective one of the plurality of frequency bands to each of at least one receiver,
wherein the antenna has different feeding positions for the power signal of a respective one of the plurality of frequency bands.
2. The at least one transmitter of claim 1 , wherein each of the plurality of matching units is provided corresponding to the power signal of a respective one of the plurality of frequency bands.
3. The at least one transmitter of claim 1 , further comprising a frequency information receiving unit configured to receive frequency information from the at least one receiver,
wherein the signal generator generates selectively the power signal of a respective one of the plurality of frequency bands based on the frequency information transmitted from the frequency information receiving unit.
4. The at least one transmitter of claim 1 , further comprising at least one power amplifier located between the signal generator and the plurality of matching units amplifying the power signal of a respective one of the plurality of frequency bands.
5. The at least one transmitter of claim 4 , wherein when the at least one power amplifier is provided in multiple numbers, each of the plurality of power amplifiers is provided corresponding to the number of the plurality of matching units,
wherein the at least one transmitter further comprises a switch located between the signal generator and the plurality of power amplifiers transmitting selectively the power signal of a respective one of the plurality of frequency bands to the plurality of the power amplifiers.
6. A wireless charging system of using multi-frequency, comprising at least one transmitter and at least one receiver charged wirelessly by the at least one transmitter,
wherein the at least one transmitter comprises:
a signal generator configured to generate a power signal of a respective one of a plurality of frequency bands;
a plurality of matching units connected to the signal generator configured to match and output the power signal of a respective one of the plurality of frequency bands; and
an antenna connected to the plurality of matching units configured to transmit the power signal of a respective one of the plurality of frequency bands to each of the at least one receiver,
wherein the one antenna has different feeding positions for the power signal of a respective one of the plurality of frequency bands,
wherein the at least one receiver comprises:
a single antenna configured to receive the power signal of a respective one of the plurality of frequency bands from each of the at least one transmitter;
a plurality of matching units connected to the antenna configured to match and output the power signal of a respective one of the plurality of frequency bands; and
a plurality of rectifiers connected to the plurality of matching units rectifying AC power applied to the power signal of a respective one of the plurality of frequency bands to DC power.
7. The system of claim 6 , wherein each of the plurality of rectifiers and each of the plurality of matching units included in the at least one receiver are provided corresponding to the power signal of a respective one of the plurality of frequency bands.