Patent ID: 7194362
Filing Date: 2007-03-20
Classification: G01R

Abstract:
1. A switching circuit having a capacitor and a plurality of semiconductor switches to connect both ends of each of a plurality of unit cells of a set of batteries formed with the plurality of unit cells connected in series to the capacitor sequentially, further comprising a plurality of level shift circuits, wherein a level shift circuit is provided for each of the plurality of semiconductor switches, to output a level shift of the control signal to a gate of the corresponding semiconductor switch, wherein the level shift circuit corresponding to the semiconductor switch connected to a higher rank unit cell has a power supply between a first unit cell and a lowest unit cell, and has a higher current, and wherein the plurality of level shift circuits have a first current path, the power supply thereof being between the first unit cell and the lowest unit cell, and a second current path, the power supply thereof being between the first unit cell and a second unit cell with a prescribed lower number rank.