Electronic device and method for increasing power supply efficiency of wireless charging circuit

An electronic device comprising:

• a first battery;
• a wireless interface including a coil;
• a wireless charging integrated circuit (IC) electrically connected to the coil;
• a universal serial bus (USB) interface configured to be connected to a wired charging unit;
• a first charger including a switching regulator;
• a second charger including a switched-capacitor voltage divider;
• and
• a processor,
• wherein the processor is configured to:
• while charging the first battery via the USB interface,
• identify that a wireless power sharing function is performed such that the electronic device supplies wireless power to an external device including a second battery via the wireless interface;
• identify, based on the performing of the wireless power sharing function, a charging state of the external device aligned with the coil;
• in accordance with identifying that the charging state of the external device is a constant current (CC) mode, control the first charger to supply first power to the wireless charging IC, wherein the wireless charging IC provides a current to the coil based on the first power to supply wireless power to the external device;
• and
• in accordance with identifying that the charging state of the external device is a constant voltage (CV) mode,
• activate a path that directly connects the first battery and the wireless charging IC and control to supply, via the path, second power lower than the first power to the wireless charging IC, wherein the wireless charging IC sources a current to the coil based on the second power to supply wireless power to the external device.