A cooking apparatus comprising: a first coil and a second coil ; a third coil and a fourth coil arranged in a second column; a plurality of inverters configured to supply a drive current to the first coil , second coil , third coil , and fourth coil ; a plurality of rectifiers configured to supply direct current ,DC, power to the plurality of inverters; a plurality of switches configured to connect each of the plurality of rectifiers to at least one of a first external power supply (PS1) or a second external power supply (PS2); and a controller configured to control the plurality of switches, wherein: the first external power supply (PS1) is configured to supply power to at least one of the first coil , second coil , third coil , or fourth coil , and the second external power supply (PS2) is configured to supply power to at least one of the first coil , second coil , third coil , or fourth coil , characterized in that the first coil and the second coil are arranged in a first column, in that based on a sum of power of the first coil and power of the second coil being greater than a reference power, the controller is configured to control the plurality of switches such that the first external power supply (PS1) supplies power to the first coil and the second external power supply (PS2) supplies power to the second coil , wherein, based on the power of the first coil being greater than the power of the second coil , the controller is configured to control the plurality of switches such that the second external power supply (PS2) supplies power to the third coil and the fourth coil . a first coil and a second coil ; a third coil and a fourth coil arranged in a second column; a plurality of inverters configured to supply a drive current to the first coil , second coil , third coil , and fourth coil ; a plurality of rectifiers configured to supply direct current ,DC, power to the plurality of inverters; a plurality of switches configured to connect each of the plurality of rectifiers to at least one of a first external power supply (PS1) or a second external power supply (PS2); and a controller configured to control the plurality of switches, wherein: the first external power supply (PS1) is configured to supply power to at least one of the first coil , second coil , third coil , or fourth coil , and the second external power supply (PS2) is configured to supply power to at least one of the first coil , second coil , third coil , or fourth coil , the first external power supply (PS1) is configured to supply power to at least one of the first coil , second coil , third coil , or fourth coil , and the second external power supply (PS2) is configured to supply power to at least one of the first coil , second coil , third coil , or fourth coil , characterized in that the first coil and the second coil are arranged in a first column, in that based on a sum of power of the first coil and power of the second coil being greater than a reference power, the controller is configured to control the plurality of switches such that the first external power supply (PS1) supplies power to the first coil and the second external power supply (PS2) supplies power to the second coil , wherein, based on the power of the first coil being greater than the power of the second coil , the controller is configured to control the plurality of switches such that the second external power supply (PS2) supplies power to the third coil and the fourth coil . <EOS>