Multifunctional portable power bank

A multifunctional portable power bank, comprising:

• a main body internally defining a chamber, in which a battery is mounted;
• and
• a circuit board being arranged in the chamber of the main body and connected to the battery;
• the circuit board including:
• a buck converter connected to a first connector and the battery;
• a booster connected to the battery and a second connector;
• a first control unit connected to the buck converter, the booster, a changeover switch, and an LED indicator;
• the first control unit controlling the buck converter to reduce an external power supply supplied thereto to a voltage matching that of a battery power of the battery;
• and controlling the booster to boost the battery power supplied thereto to a preset voltage;
• a second control unit connected to the first control unit and a wireless transmission unit;
• and the second control unit including a connection interface, an Ethernet interface, and a plurality of modules supporting network and file access for controlling network/cloud data transmission and access;
• an Ethernet connector connected to the Ethernet interface;
• a regulator connected to the battery and the second control unit;
• and the battery power being supplied to the second control unit and the wireless transmission unit via the regulator;
• and
• a connector unit connected to the connection interface of the second control unit, a flash memory and a third connector;
• the connector unit including a hub/switch and a controller;
• the hub/switch being connected to the controller and the third connector, and the controller being connected to the flash memory.