An electronic device , comprising: a coil ; an inverter including a plurality of gate inputs, the inverter being electrically connected to the coil ; and at least one processor configured to: control the plurality of gate inputs of the inverter in an anti-symmetric manner by applying different turned-on time ratios to the plurality of gate inputs to generate an output power, receive an output power reduction request from an external electronic device ; based on receiving the output power reduction request, determine whether a ratio of ON-operations to OFF-operations of the plurality of gate inputs of the inverter is less than or equal to a designated ratio; and based on the ratio of ON-operations to OFF-operations of the plurality of gate inputs of the inverter being less than or equal to the designated ratio, modulate a phase of a voltage input into the plurality of gate inputs of the inverter to generate the output power; wherein the electronic device is configured such that the output power generated by controlling the plurality of gate inputs of the inverter in the anti-symmetric manner is higher than the output power generated by modulating the phase of the voltage input into the plurality of gate inputs of the inverter . a coil ; an inverter including a plurality of gate inputs, the inverter being electrically connected to the coil ; and at least one processor configured to: control the plurality of gate inputs of the inverter in an anti-symmetric manner by applying different turned-on time ratios to the plurality of gate inputs to generate an output power, receive an output power reduction request from an external electronic device ; based on receiving the output power reduction request, determine whether a ratio of ON-operations to OFF-operations of the plurality of gate inputs of the inverter is less than or equal to a designated ratio; and based on the ratio of ON-operations to OFF-operations of the plurality of gate inputs of the inverter being less than or equal to the designated ratio, modulate a phase of a voltage input into the plurality of gate inputs of the inverter to generate the output power; wherein the electronic device is configured such that the output power generated by controlling the plurality of gate inputs of the inverter in the anti-symmetric manner is higher than the output power generated by modulating the phase of the voltage input into the plurality of gate inputs of the inverter . control the plurality of gate inputs of the inverter in an anti-symmetric manner by applying different turned-on time ratios to the plurality of gate inputs to generate an output power, receive an output power reduction request from an external electronic device ; based on receiving the output power reduction request, determine whether a ratio of ON-operations to OFF-operations of the plurality of gate inputs of the inverter is less than or equal to a designated ratio; and based on the ratio of ON-operations to OFF-operations of the plurality of gate inputs of the inverter being less than or equal to the designated ratio, modulate a phase of a voltage input into the plurality of gate inputs of the inverter to generate the output power; wherein the electronic device is configured such that the output power generated by controlling the plurality of gate inputs of the inverter in the anti-symmetric manner is higher than the output power generated by modulating the phase of the voltage input into the plurality of gate inputs of the inverter . <EOS>