Wireless charging apparatus using electromagnetic induction and wireless charging method using electromagnetic induction
An embodiment of the present invention provides a wireless charging apparatus and a method, in which a reception unit can charge even when an inner coil of the reception unit and an inner coil of a transmission unit are not positioned in parallel. An embodiment of the present invention provides a wireless charging apparatus and a method including: a transmission unit that includes a first coil that generates a magnetic field when power is applied; a reception unit that includes a second coil, and that charges a battery using induced current that is induced in the second coil when the magnetic field of the first coil is generated; a position sensing unit that measures position information for the first coil and the second coil; and a conversion unit that converts a direction of the magnetic field according to the position information for the first coil and the second coil.
1. A wireless charging apparatus using electromagnetic induction, the wireless charging apparatus comprising:
a transmission unit including a first coil that generates a magnetic field when power is applied;
a reception unit including a second coil and charging a battery using induced current that is induced in the second coil when the magnetic field of the first coil is generated;
a position sensing unit measuring position information for the first coil and the second coil; and
a conversion unit converting a direction of the magnetic field according to the position information for the first coil and the second coil.
2. The wireless charging apparatus of claim 1 , wherein the conversion unit includes at least two pairs of first electromagnets and second electromagnets disposed to face each other between the first coil and the second coil.
3. The wireless charging apparatus of claim 2 , wherein the reception unit includes a gyro sensor, and the position sensing unit measures the position information for the first coil and the second coil based on position information for the gyro sensor.
4. The wireless charging apparatus of claim 3 , wherein the position sensing unit measures the position information for the first coil and the second coil based on information for a maximum efficiency point, at which charging efficiency of the reception unit becomes highest, by sequentially operating at least one of the at least two electromagnet pairs of the conversion unit, respectively, and then getting feedback on the charging efficiency of the reception unit.
5. The wireless charging apparatus of claim 2 , wherein the transmission unit, the position sensing unit and the conversion unit are installed in a housing in the form of a cup holder.
6. The wireless charging apparatus of claim 1 , wherein the transmission unit includes a near field communication (NFC) tag and opens a magnetic field generation path by performing NFC tagging with the reception unit.
7. The wireless charging apparatus of claim 1 , wherein the transmission unit includes a mass sensing unit and opens the magnetic field generation path when the mass sensing unit measures a mass of greater than or equal to a preset first mass.
8. The wireless charging apparatus of claim 7 , wherein the transmission unit closes the magnetic field generation path when feedback on the charging efficiency of the reception unit is not received or charging is not performed.
9. The wireless charging apparatus of claim 1 , wherein the position sensing unit tracks the position information for the first coil and the second coil in real time, and the conversion unit converts the direction of the magnetic field in real time according to a change in the position information for the first coil and the second coil.
10. A wireless charging method using electromagnetic induction between a first coil included in a transmission unit and a second coil included in a reception unit, the wireless charging method comprising:
generating a magnetic field through the first coil by applying power to the transmission unit;
measuring position information for the first coil and the second coil; and
converting a direction of the magnetic field by means of a conversion unit according to the position information for the first coil and the second coil.
11. The wireless charging method of claim 10 , wherein in the converting of the direction of the magnetic field, the conversion unit includes at least two pairs of first electromagnets and second electromagnets disposed to face each other between the first coil and the second coil, and converts the direction of the magnetic field by operating one or more pairs of electromagnets of the at least two pairs of first electromagnets and second electromagnets selected according to the position information for the first coil and the second coil.
12. The wireless charging method of claim 11 , wherein in the measuring of the position information for the first coil and the second coil, the position information for the first coil and the second coil is measured based on the position information for a gyro sensor of the reception unit.
13. The wireless charging method of claim 11 , wherein in the measuring of the position information for the first coil and the second coil, the position information for the first coil and the second coil is measured based on information for a maximum charging efficiency point, at which charging efficiency of the reception unit becomes highest, by sequentially operating at least one electromagnet pair among the electromagnet pairs of the conversion unit, respectively, and then getting feedback on the charging efficiency of the reception unit.