Multi-port battery charge and discharge system

A multi-port battery charge and discharge system, comprising:

• a plurality of voltage converting circuits;
• a plurality of USB ports, corresponding to the plurality of voltage converting circuits;
• and
• a plurality of port connecting switches, corresponding to the plurality of voltage converting circuits;
• wherein
• each one of the plurality of voltage converting circuits comprises a first pin coupled to a corresponding one of the plurality of USB ports through a corresponding one of the plurality of port connecting switches, and a second pin coupled to a battery pack;
• and wherein
• when the multi-port battery charge and discharge system is configured to operate in a charge state, the plurality of voltage converting circuits are configured to operate in a charge mode, wherein one of the plurality of voltage converting circuits is configured to generate a master current signal at its second pin and to regulate the master current signal based on a voltage feedback signal indicative of a voltage of the battery pack and a current feedback signal indicative of a current flowing through the battery pack, and wherein each one of the remained ones of the plurality of voltage converting circuits is configured to generate a predetermined supplemental current signal at its second pin.