Cell balance circuit having rechargeable cells

摘要

In a cell balance circuit including a cell group in which two or more rechargeable cells are connected in series, a voltage converting circuit converts the voltages of the respective cells in the cell group into GND voltage standards on the basis of a ground voltage and produces two or more converted voltages. An output circuit determines a lowest voltage of the two or more converted voltages and produces the lowest voltage. Discharge circuits are provided for the respective cells for forming discharge loops to discharge the corresponding cells. Discharge control circuits are provided for the respective discharge circuits. Each discharge control circuit determines a difference between the converted voltage of the corresponding cell and the lowest voltage to control the discharge circuit to form the discharge loop when the difference exceeds a predetermined value.