Patent ID: 8154250

Claim:
A battery balanced charging controller, for balancing a battery change of a first battery and a second battery, and a negative terminal of the first battery being electrically coupled to a positive terminal of the second battery to form a connecting point, and a positive terminal of the first battery forming a first terminal, and a negative terminal of the second battery forming a second terminal, and the battery balanced charging controller comprising: a voltage divider, coupled between the first terminal and the second terminal, for providing an upper reference potential level and a lower reference potential level, and the upper reference potential level being higher than the lower reference potential level; a switch module including a first switch and a second switch, and the first switch being coupled to the first terminal and the connecting point, and the second switch being coupled to the second terminal and the connecting point; a balance circuit, coupled to the connecting point, the voltage divider and the switch module, and the balance circuit determining whether to pass a balanced charging current through the first switch or the second switch according to a potential level of the connecting point, the upper reference potential level and the lower reference potential level; and an under voltage lockout unit coupled to the first terminal and the second terminal, such that if the potential difference between the first terminal and the second terminal is lower than a predetermined starting voltage, the under voltage lockout unit generates an under voltage signal for stopping the operation of the battery balanced charging controller.