Patent ID: 9246342
Filing Date: 2016-01-26
CPC Classification: H02J

Claim Text:
1. A charging system for portable electronic equipment to charge a battery incorporated in the portable electronic equipment by connecting a USB battery charger to the portable electronic equipment, the charging system comprising: a power supply terminal; a first switching device providing the battery with a charging current received at the power supply terminal from the USB battery charger; a second switching device connected between the power supply terminal and a ground; a control circuit controlling the first and second switching devices, wherein the control circuit turns on the first switching device to commence providing the battery with the charging current and, in response to a voltage at the power supply terminal having a first value that is lower than a first predetermined voltage, turns off the first switching device and turns on the second switching device so that the voltage at the power supply terminal is reduced to a second value that is lower than a second predetermined voltage, the second predetermined voltage being lower than the first predetermined voltage; and the charging system configured to maintain the power supply terminal at substantially the second value for a predetermined period of time.