| 摘要 |
A coil for electrically charging series-connected cells and a coil for maintaining voltage balance between the series-connected cells are combined to downsize a whole circuit configuration. A coil is provided in common for first and second storage cells. The coil is electrically connected to one of the storage cells to charge the one of the storage cells, and after that, the coil is electrically connected to the other one to charge the other one. A plurality of switches for switching a path of a charging current flowing in the coil are provided. In a first charging period, a path of a charging current flowing into a reference voltage through the coil is formed, in a second charging period, a path of a charging current flowing into a second cell from the coil is formed, in a third charging period, a path of a charging current flowing into the reference voltage through the coil is formed, and in a forth charging period, one end of the coil is electrically conducted with one end of the first cell and another end of the coil is electrically conducted with another end of the first cell to form a path of a charging current flowing into the first cell from the coil. |
