Patent ID: 8299755
Filing Date: 2012-10-30
Classification: H02J

Abstract:
1. A battery balance charging controller, for balancing the charging of a first battery and a second battery, wherein a negative terminal of the first battery is connected with a positive terminal of the second battery to form a connection point, a positive terminal of the first battery forms a first terminal, a negative terminal of the second battery forms a second terminal, the battery balance charging controller comprising: a battery reference voltage generating unit, for providing a first set of battery balancing determination signals and a second set of battery balancing determination signals, wherein the first set of battery balancing determination signals comprises an up high reference voltage level and an up low reference voltage level, and the second set of battery balancing determination signals comprises a down low reference voltage level and a down high reference voltage level, wherein the up high reference voltage level is higher than the up low reference voltage level, and the down low reference voltage level is lower than the down high reference voltage level; a voltage balancing unit, including a first balancing electric current unit and a second balancing electric current unit, wherein the first balancing electric current unit is coupled to the first terminal and the connection point, and the second balancing electric current unit is coupled to the second terminal and the connection point; and a balance judging unit, coupled to the connection point, the battery reference voltage generating unit, and the first and the second balancing electric current units of the voltage balancing unit, for controlling, when a voltage level of the connection point is higher than the up high reference voltage level, the first and the second balancing electric current units of the voltage balancing unit so as to make one battery having a lower voltage out of the first battery and the second battery to receive a greater charging current until a voltage level of the connection point is equal to the up low reference voltage level, or for controlling, when the voltage level of the connection point is lower than down low reference voltage level, the first and the second balancing electric current units of the voltage balancing unit so as to make one battery having the lower voltage out of the first battery and the second battery to receive the greater charging current until the voltage level of the connection point is equal to the down high reference voltage level.