Wireless power transmission device and control method thereof

1 . A wireless power transmission device comprising:

a wireless power transmitter comprising a working coil and configured to wirelessly transmit power to a cooking appliance located in a cooking zone;

a communication interface configured to establish a wireless communication connection with the cooking appliance;

a sensing coil surrounding an outer side edge of the working coil such that the sensing coil encompasses the outer side edge of the working coil;

a light source driver electrically connected to the sensing coil;

a light source configured to emit light according to driving of the light source driver; and

at least one processor,

wherein the at least one processor is configured to:

control the wireless power transmitter to transmit first power supplied by the working coil to the cooking appliance,

control the light source driver to measure second power induced in the sensing coil surrounding the working coil when the first power is transmitted through the working coil, and

control the light source driver to set at least one of a light emission intensity of the light source, a light emission color of the light source, or a light emission form of the light source, based on an amount of the second power.

2 . The wireless power transmission device of claim 1 ,

wherein the amount of the second power varies depending on a transmission amount of the first power and characteristics of the cooking appliance, and

wherein the characteristics of the cooking appliance comprise at least one of a material of the cooking appliance, a size of the cooking appliance, a placement position of a reception coil of the cooking appliance, a size of the reception coil, or an inductance of the reception coil.

3 . The wireless power transmission device of claim 1 , further comprising:

a heat-resistant substrate surrounding the working coil,

wherein the sensing coil is arranged on the heat-resistant substrate by using a printed electronics method.

4 . The wireless power transmission device of claim 1 , wherein the light source is arranged to at least partially surround an outer side edge of the sensing coil.

5 . The wireless power transmission device of claim 1 , wherein the light source is arranged in a gap region between the working coil and the sensing coil.

6 . The wireless power transmission device of claim 1 , wherein, as the amount of the second power increases, the light emission intensity of the light source increases.

7 . The wireless power transmission device of claim 1 ,

wherein when the amount of the second power is in a first range, the light source driver sets the light emission color of the light source to be a first color,

wherein when the amount of the second power is in a second range greater than the first range, the light source driver sets the light emission color of the light source to be a second color different from the first color, and

wherein when the amount of the second power is in a third range greater than the second range, the light source driver sets the light emission color of the light source to be a third color different from the first color and the second color.

8 . The wireless power transmission device of claim 1 , further comprising:

a light collection member covering the light source; and

a filter member adjacent to the light collecting member,

wherein light emitted by the light source is incident upon the cooking appliance via the light collection member and the filter member.

9 . The wireless power transmission device of claim 1 , further comprising:

a light collection member covering the light source; and

a filter member adjacent to the light collecting member,

wherein light emitted by the light source is output to a peripheral region surrounding an outer side edge of the cooking zone, via the light collection member and the filter member.

10 . The wireless power transmission device of claim 1 , wherein the at least one processor is further configured to:

control the communication interface to receive temperature information from the cooking appliance, and

control the light source driver to set at least one of the light emission intensity, the light emission color, or the light emission form, based on the amount of the second power and the temperature information.

11 . The wireless power transmission device of claim 10 , wherein the at least one processor is further configured to:

control the communication interface to receive identification information from the cooking appliance,

determine whether the cooking appliance includes a first temperature sensor, based on the identification information, and

control the communication interface to receive the temperature information about a temperature measured by the first temperature sensor.

12 . The wireless power transmission device of claim 10 , wherein the at least one processor is further configured to;

when a temperature of the cooking appliance according to the temperature information is equal to or greater than a threshold temperature, control the light source driver so that the light source flickers.

13 . The wireless power transmission device of claim 1 , further comprising:

a temperature sensor configured to obtain temperature information by measuring a temperature of the cooking zone,

wherein the at least one processor is further configured to:

when the temperature information is not received from the cooking appliance, control the temperature sensor to obtain the temperature information by measuring the temperature, and

control the light source driver to set at least one of the light emission intensity, the light emission color, or the light emission form, based on the amount of the second power and the temperature information.

14 . The wireless power transmission device of claim 1 , further comprising:

a temperature sensor configured to obtain temperature information by measuring temperature of the cooking zone,

wherein the at least one processor is further configured to:

control the wireless power transmitter to stop transmitting the first power,

control the temperature sensor to obtain the temperature information by measuring the temperature after stopping transmitting the first power, and

control the light source driver to set at least one of the light emission intensity, the light emission color, or the light emission form, based on the temperature information.

15 . The wireless power transmission device of claim 1 ,

wherein the sensing coil is configured to transmit, to the light source driver, current induced by a magnetic field generated around the working coil, and

wherein the sensing coil is arranged to surround the working coil in a circle in which the sensing coil forms the circle and the working coil is within the circle.

16 . A method performed by a wireless power transmission device, the method comprising:

controlling a wireless power transmitter of the wireless power transmission device to transmit first power supplied by a working coil included in the wireless power transmitter to a cooking appliance;

controlling a light source driver of the wireless power transmission device to measure second power induced in a sensing coil surrounding the working coil in which the sensing coil encompasses an outer side edge of the working coil, when the first power is transmitted through the working coil; and

controlling the light source driver to set at least one of a light emission intensity of a light source of the wireless power transmission device, a light emission color of the light source, or a light emission form of the light source, based on an amount of the second power.

17 . The method of claim 16 ,

wherein the amount of the second power varies depending on a transmission amount of the first power and characteristics of the cooking appliance, and

wherein the characteristics of the cooking appliance comprise at least one of a material of the cooking appliance, a size of the cooking appliance, a placement position of a reception coil of the cooking appliance, a size of the reception coil, or an inductance of the reception coil.

18 . The method of claim 16 , wherein, as the amount of the second power increases, the light emission intensity of the light source increases.

19 . The method of claim 16 , further comprising:

when the amount of the second power is in a first range, setting the light emission color of the light source to be a first color;

when the amount of the second power is in a second range greater than the first range, setting the light emission color of the light source to be a second color different from the first color; and

when the amount of the second power is in a third range greater than the second range, setting the light emission color of the light source to be a third color different from the first color and the second color.

20 . The method of claim 16 , further comprising:

controlling a communication interface of the wireless power transmission device to receive temperature information from the cooking appliance; and

controlling the light source driver to set at least one of the light emission intensity, the light emission color, or the light emission form, based on the amount of the second power and the temperature information.

21 . A cooking appliance comprising:

a communication interface configured to establish a wireless communication connection with a wireless power transmission device;

a reception coil configured to wirelessly receive power from a wireless power transmission device;

a pickup coil configured to generate power for operation of a printed circuit board (PCB);

a communication coil configured to perform wireless communication with the wireless power transmission device;

a power supply electrically connected to the reception coil;

a light source configured to emit light according to driving of the power supply; and

at least one processor,

wherein the at least one processor is configured to:

measure first power received by the reception coil, and

control the power supply to set at least one of a light emission intensity of the light source, a light emission color of the light source, or a light emission form of the light source, based on an amount of the first power,

wherein a magnetic field generated from current flowing in a working coil passes through the reception coil,

wherein, as the magnetic field passes through the reception coil, an induced current flows in the reception coil,

wherein power is supplied to a load due to the induced current flowing in the reception coil,

wherein the reception coil, the pickup coil, and the communication coil are disposed on a same layer or in a stack structure.