Patent ID: 7288919

Claim:
A voltage balancing circuit that balances voltage between both polarities of each storage circuit of a plurality of storage circuits (B 1 , B 2 , B 3 ) connected to one another in series, comprising: a capacitor ( 57 , 58 , 59 ); a first connecting section ( 51 , 53 , 55 ) that connects said capacitor in parallel to a first storage circuit selected from said plurality of storage circuits wherein said first storage circuit includes any two of B 1 , B 2 , B 3 connected to one another in series to charge/discharge said capacitor ( 57 , 58 , 59 ) from said first storage circuit; and a second connecting section ( 52 , 54 , 56 ) that connects said charged/discharged capacitor ( 57 , 58 , 59 ) in parallel to a second storage circuit wherein said second storage circuit includes any two of B 1 , B 2 , B 3 , wherein said any two of B 1 , B 2 , B 3 of said second storage circuit differs from said any two of B 1 , B 2 , B 3 of said first storage circuit to charge/discharge said select second storage circuit from said charged/discharged capacitor ( 57 , 58 , 59 ), wherein: said first connecting section ( 51 , 53 , 55 ) and said second connecting section ( 52 , 54 , 56 ) include a first switch ( 51 , 53 , 55 ) and a second switch ( 52 , 54 , 56 ) that are connected to each other in series between one electrode of said first and second storage circuits and an other electrode; and one end of said capacitor ( 57 , 58 , 59 ) is connected to a connecting node between said first switch ( 51 , 53 , 55 ) and said second switch ( 52 , 54 , 56 ) that are connected to each other in series between the one electrode and the other electrode of said first and second storage circuits, and the other end of said capacitor ( 57 , 58 , 59 ) is connected in common.