Energy transfer circuit and power storage system
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorMasaaki Kuranuki
Life of this patent
Estimating the term…
Abstract
The controller controls a cell selection circuit to electrically connect both ends of a cell to be discharged among n cells connected in series and both ends of the inductor for a predetermined time. Next, the controller controls the cell selection circuit to electrically cut off the n cells and the inductor, and turn on the clamp switch. Next, the controller turns off the clamp switch, and controls the cell selection circuit to electrically connect both ends of a cell to be charged among the n cells and both ends of the inductor for a predetermined time.
Claims9
An energy transfer circuit comprising:
- an inductor;
- a cell selection circuit provided between the inductor and n cells connected in series, where n is an integer of two or more, the cell selection circuit being configured to electrically connect both ends of any cell of the n cells to both ends of the inductor;
- a clamp switch for forming a closed loop including the inductor in a state where the cell selection circuit does not select any cell;
- and
- a controller that controls the cell selection circuit and the clamp switch,
- wherein the controller is configured to:
- cause the cell selection circuit to electrically connect both ends of a cell to be discharged among the n cells to both ends of the inductor for a predetermined time,
- cause the cell selection circuit to electrically disconnect the n cells from the inductor, and turn on the clamp switch, and
- turn off the clamp switch, and cause the cell selection circuit to electrically connect both ends of a cell to be charged among the n cells to both ends of the inductor for a predetermined time, and
- the cell selection circuit includes:
- a first wiring connected to one end of the inductor;
- a second wiring connected to another end of the inductor;
- (n+1) first wiring side switches each connected between the first wiring and a corresponding one of nodes of the n cells connected in series;
- and
- (n+1) second wiring side switches connected each between the second wiring and a corresponding one of nodes of the n cells connected in series.
An energy transfer circuit comprising:
- an energy holding circuit including:
- an inductor;
- and
- four clamp switches that are fully bridge-connected;
- a cell selection circuit provided between the energy holding circuit and n cells connected in series, where n is an integer of two or more, the cell selection circuit being configured to electrically connecting both ends of any cell of the n cells to both ends of the energy holding circuit;
- and
- a controller configured to cause the cell selection circuit and the four clamp switches, wherein:
- the four clamp switches form a closed loop including the inductor in a state where the cell selection circuit does not select any cell,
- the cell selection circuit includes:
- a first wiring connected to one end of the energy holding circuit,
- a second wiring connected to another end of the energy holding circuit,
- (n+1) first wiring side switches each connected between the first wiring and a corresponding one of nodes of the n cells connected in series, and
- (n+1) second wiring side switches each connected between the second wiring and a corresponding one of nodes of the n cells connected in series,
- among the four clamp switches, a first arm having a first clamp switch and a second clamp switch connected in series and a second arm having a third clamp switch and a fourth clamp switch connected in series are connected in parallel between the first wiring and the second wiring, and
- the inductor is connected between a node between the first clamp switch and the second clamp switch and a node between the third clamp switch and the fourth clamp switch.
Dependencies are inferred from the claim text.