| 主权项 |
1. A charging circuit that simultaneously charges a battery with an electrical current supplied from an external power source and supplies the electrical current supplied from the external power source to a load, the charging circuit comprising:
a power supply circuit to supply an electrical current from the battery to the load when a load current required by the load is greater than a maximum supply current of the external power source; a voltage monitor to detect and monitor a voltage of the battery; a first switch connected between the external power source and the load; a current controller to control flow through the first switch of a first electrical current supplied by the external power source to the load; a second switch connected between the external power source and the battery; an initial charging controller to control flow through the second switch of a second electrical current, supplied by the external power source to the battery; a third switch connected between the battery and the load; a charging controller to control flow through the third switch of a third electrical current supplied by the battery to the load; a circuit controller connected to the voltage monitor, the current controller, the initial charging controller and the charging controller; a load current detector that is connected to the load, to detect a load electrical current flowing from the charging circuit to the load, wherein, when a load current required by the load is greater than a maximum supply current of the external power source and the detected voltage of the battery is lower than a predetermined threshold, the circuit controller causes the current controller and the charging controller to turn off the first and third switch, respectively, and causes the initial charging controller to turn on the second switch in order to have the external power source supply electrical current only to the battery, and after the voltage monitor detects that the voltage of the battery is greater than or equal to the predetermined threshold, the circuit controller causes the current controller and the charging controller to turn on the first and third switch, respectively, and causes the initial charging controller to turn off the second switch, in order to supply power from the external power source and battery to the load. |
