Abstract: The present invention provides an earphone device, an operation method and a charging box thereof. The earphone device includes a charging box and a pair of Bluetooth earphones. The charging box includes a first wireless transceiver and a microcontroller unit (MCU). The first wireless transceiver is configured to transceive a first wireless signal. The pair of Bluetooth earphones is detachably disposed in the charging box and electrically connected to the charging box and configured to receive a Bluetooth wireless signal or the first wireless signal. The microcontroller unit (MCU) is configured in the charging box to provide a control signal to manage a connection or charging of the Bluetooth earphones.

Abstract: A backup power control system includes a main power supply unit, a first negative feedback circuit unit, a standby power supply unit, a second negative feedback circuit unit, and a control unit. The main power supply unit is suitable for outputting a main power. The standby power supply unit is suitable for outputting a standby power. The control unit switches the first negative feedback circuit unit and the second negative feedback circuit unit to be turned on or not to be turned on in response to whether a normal power supply signal of the main power is received. When the normal power supply signal is received, the control unit enables the first negative feedback circuit unit to be turned on and enables the second negative feedback circuit unit not to be turned on.