Patent ID: 8288993

Claim:
A battery balanced charging controller, for balancing a battery charge of a first battery and a second battery, with 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 serving as a first terminal, and a negative terminal of the second battery serving as a second terminal, the battery balanced charging controller comprising: a battery reference voltage generator coupled between the first terminal and the second terminal, for providing a first series of battery balance judgment signals and a second series of battery balance judgment signals, the first series of battery balance judgment signals comprising a high-plus reference signal and a low-plus reference signal, and the second series of battery balance judgment signals comprising a low-minus reference signal and a high-minus reference signal, wherein a voltage level of the high-plus reference signal is higher than that of the low-minus reference signal; a voltage balance module comprising a first balance current unit and a second balance current unit, the first balance current unit coupled to the first terminal and the connecting point, and the second balance current unit coupled to the second terminal and the connecting point; and a balance judgment circuit coupled to the connecting point, the battery reference voltage generator and the voltage balance module, and determining whether to enter a first condition or a second condition according to the first series of battery balance judgment signals, the second series of battery balance judgment signals and a voltage level of the connecting point; wherein the voltage balance module provides a balance current to one of the first battery and the second battery whichever is lower in voltage level when the balance judgment circuit is under the first condition.