Wireless charger

1. A wireless charger, comprising:

a power source;

a transmission coil configured to generate an electromagnetic field when power is supplied from the power source to cause an electromagnetic induction phenomenon between a reception coil provided in an object requiring power and the transmission coil; and

a filter unit disposed on one side of the transmission coil to be disposed between the transmission coil and the reception coil and including a coil and at least two capacitors for eliminating noise generated between the transmission coil and the reception coil;

wherein the at least two capacitors includes a first capacitor connected to a first end and an intermediate point of the coil, and a second capacitor connected to the first end of the coil and a second end of the coil

wherein the filter unit further includes:

a first switch disposed between the first capacitor and the second end of the coil;

a second switch disposed between the second capacitor and the second end of the coil;

a first temperature detector disposed between the first end of the coil and the first capacitor to detect a temperature of the coil; and

a second temperature detector disposed between the second capacitor and the second switch to detect the temperature of the coil; and

wherein one of the first switch and the second switch is turned on;

a controller configured to:

identify the temperature of the coil detected by the first temperature detector based on the turn-on of the first switch; and

identify the temperature of the coil detected by the second temperature detector based on the turn-on of the second switch.

2. The wireless charger according to claim 1 , further comprising

a main body having a seating portion on which the object requiring power is seated,

wherein the transmission coil is provided inside the main body, and the filter unit is provided inside the main body and is disposed between the seating portion and the transmission coil.

3. A wireless charger, comprising:

a power source;

a transmission coil configured to generate an electromagnetic field when power is supplied from the power source to cause an electromagnetic induction phenomenon between a reception coil provided in an object requiring power and the transmission coil; and

a filter unit disposed on one side of the transmission coil to be disposed between the transmission coil and the reception coil and including at least one coil and at least one capacitor for eliminating noise generated between the transmission coil and the reception coil;

wherein the filter unit includes:

a first filter having a first coil, a first capacitor connected to a first end and a second end of the first coil, and a second capacitor connected to an intermediate point of the first coil and the second end of the first coil;

a first switch disposed between the first capacitor and the second end of the first coil;

a second switch disposed between the second capacitor and the second end of the first coil;

a first temperature detector disposed between the first end of the first coil and the first capacitor to detect a temperature of the first coil; and

a second temperature detector disposed between the second capacitor and the second switch to detect the temperature of the first coil;

a second filter having a second coil, a third capacitor connected to a first end the second coil and an intermediate point of the second coil, and a fourth capacitor connected to the first end of the second coil and a second end of the second coil;

a third switch disposed between the first end of the second coil and the third capacitor;

a fourth switch disposed between the first end of the second coil and the fourth capacitor;

a third temperature detector disposed between the third capacitor and the third switch to detect a temperature of the second coil; and

a fourth temperature detector disposed between the fourth capacitor and the second end of the second coil to detect the temperature of the second coil; and

a controller configured to:

control one of the first switch and the second switch to turn on based on one of the temperature of the first coil detected by the first temperature detector or the temperature of the first coil detected by the second temperature detector; and

control one of the third switch and the fourth switch to turn on based on one of the temperature of the second coil detected by the third temperature detector or the temperature of the second coil detected by the fourth temperature detector.

4. The wireless charger according to claim 3 , wherein:

the controller is further configured to, at turn-on control of the first switch and turn-off control of the second switch, turn off the first switch and turn on the second switch, in response to determining that the temperature of the first coil detected by the first temperature detector is greater than or equal to a reference temperature.

5. The wireless charger according to claim 3 , wherein:

the controller is further configured to, at turn-on control of the third switch and turn-off control of the fourth switch, turn off the third switch and turn on the fourth switch, in response to determining that the temperature of the second coil detected by the third temperature detector is greater than or equal to a reference temperature.

6. The wireless charger according to claim 5 , wherein the controller is configured to, at turn-off control of the third switch and turn-on control of the fourth switch, turn on the third switch and turn off the fourth switch, in response to determining that the temperature of the second coil detected by the fourth temperature detector is greater than or equal to the reference temperature.

7. The wireless charger according to claim 3 , wherein:

the controller is further configured to perform a first mode of turning off the second switch and the fourth switch when turning on the first switch and the third switch, and a second mode of turning on the second switch and the fourth switch when turning off the first switch and the third switch.

8. The wireless charger according to claim 7 , wherein:

the controller is configured to execute switching between the first mode and the second mode based on at least one of the temperature of the first coil and the temperature of the second coil.

9. A wireless charger, which performs wireless charging in a reception coil and a transmission coil, comprising:

a first filter including a first coil, a first capacitor connected to a first end of the first coil and a second end of the first coil, a second capacitor connected to an intermediate point of the first coil and the second end of the first coil, a first switch disposed between the first capacitor and the second end of the first coil, and a second switch disposed between the second capacitor and the second end of the first coil;

a first temperature detector disposed between the first end of the first coil and the first capacitor to detect a temperature of the first coil;

a second temperature detector disposed between the second capacitor and the second switch to detect the temperature of the first coil;

a second filter including a second coil, a third capacitor connected to a first end of the second coil and an intermediate point of the second coil, a fourth capacitor connected to the first end of the second coil and a second end of the second coil, a third switch disposed between the first end of the second coil and the third capacitor, and a fourth switch disposed between the first end of the second coil and the fourth capacitor;

a third temperature detector disposed between the third capacitor and the third switch to detect a temperature of the second coil;

a fourth temperature detector disposed between the fourth capacitor and the second end of the second coil to detect the temperature of the second coil; and

a controller configured to:

perform a first mode of turning off the second switch and the fourth switch when turning on the first switch and the third switch;

perform a second mode of turning on the second switch and the fourth switch when turning off the first switch and the third switch; and

execute switching between the first mode and the second mode based on at least one of the temperature of the first coil and the temperature of the second coil.

10. The wireless charger according to claim 9 , wherein the controller is configured to:

when performing the first mode, switch to the second mode in response to determining that the temperature of the first coil detected by the first temperature detector is greater than or equal to a reference temperature or the temperature of the second coil detected by the third temperature detector is greater than or equal to the reference temperature; and

when performing the second mode, switch to the second mode in response to determining that the temperature of the first coil detected by the second temperature detector is greater than or equal to the reference temperature or the temperature of the second coil detected by the fourth temperature detector is greater than or equal to the reference temperature.

11. The wireless charger according to claim 9 , wherein the controller is configured to execute switching between the first mode and the second mode at a preset time interval.