Abstract: A power supply device includes a power transformer and a plug head. The power transformer has a housing, a conducting socket, an outputting connector, and a power conversion circuit. The housing has a wedging wall, and a receptacle wall, and both corporately form a receiving portion. The wedging wall has a wedging seat. The receptacle wall has a connection opening for receiving the conducting socket therein. The power conversion circuit is electrically connected to the conducting socket and the outputting connector to output a conversed electrical power to the outputting connector. The plug head is replaceably connected to the receiving portion, and includes an outer cover and an inner cover. The outer cover has a prong unit electrically connected to the plug connector. The inner cover has a wedging slot and a plug connector plugged in the conducting socket. The wedging seat is wedged in the wedging slot.

Abstract: A power bank adapting to a protective case is disclosed. The protective case protects a mobile communication device. The protective case has an accommodating portion and a first connecting portion. The mobile communication device is removably disposed in the accommodating portion. The power bank includes a cover plate assembly and a power bank. The cover plate assembly includes a lid portion, a folded portion and a second connecting portion. The folded portion is connected between the lid portion and the second connecting portion. The power module disposes in the cover plate assembly. The cover plate assembly is for assembling with the protective case.

Abstract: A smart ultra box adapting to a protective case is disclosed. The protective case protects a mobile communication device. The ultra box comprises a main body, a conversion unit and an expansion module. The main body has an output interface and an external power interface. The conversion unit disposes at the main body, to electrically connect the output interface and the external power interface. The expansion module electrically connects to the conversion unit. The expansion module is for communication with an external device.

Abstract: A smart ultra box adapting to a protective case is disclosed. The protective case protects a mobile communication device. The ultra box comprises a main body, a conversion unit and a flexible printed circuit board. The main body has a power output interface and an external power interface. The conversion unit disposes at the main body, to electrically connect the power output interface and the external power interface. The flexible printed circuit board electrically connects to the conversion unit, the flexible printed circuit board extending outwardly from the main body. The external power interface receives a commercial power source. The conversion unit converts the commercial power source into a first electric power and a second electric power. The power output interface output the first electric power, and the flexible printed circuit board transmits the second electric power.

Abstract: A smart ultra box adapting to a protective case is disclosed. The protective case can be assembled with a power bank to form a mobile phone protective case. The power bank provides an identification unit. The ultra box includes a main body, a conversion unit, a flexible printed circuit board, a processing unit and a memory unit. The processing unit connects to the conversion unit. The memory unit, connected to the processing unit, stores at least one PIN information. When the protective case assemble with the power bank, the ultra box according to the PIN information determines whether the identification unit is a real identification code of the processing unit; if not, the power bank stops power supply by the processing unit controlled; on the contrary, if yes, the power bank starts power supply by the processing unit controlled.