Power management circuit of rechargeable battery stack
AssigneeMarvell World Trade Ltd.
InventorsSehat Sutardja, Pantas Sutardja
Life of this patent
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Abstract
A system includes a sensing module and a switching module. The sensing module is configured to sense output voltages of first and second cells connected in series in a rechargeable battery stack. The switching module is configured to alternately connect a capacitance across the first cell and the second cell at a switching frequency when a difference in the output voltages is greater than or equal to a first threshold. The switching module is further configured to stop alternately connecting the capacitance when the difference is less than or equal to a second threshold, wherein the first threshold is greater than the second threshold.
Claims16
A system comprising:
- a sensing module configured to sense output voltages of first and second cells connected in series in a rechargeable battery stack;
- and
- a switching module configured to:
- alternately connect a capacitance across the first cell and the second cell at a switching frequency when a difference in the output voltages is greater than or equal to a first threshold, and
- stop alternately connecting the capacitance when the difference is less than or equal to a second threshold, wherein the first threshold is greater than the second threshold.
A system comprising:
- N cells connected in series in a rechargeable battery stack, where N is an integer greater than 1;
- and
- (N−1) cell balancing modules configured to balance output voltages of the N cells, wherein each of the (N−1) cell balancing modules balances output voltages of adjacent ones of the N cells, and wherein each of the (N−1) cell balancing modules includes:
- a sensing module configured to sense the output voltages of the adjacent ones of the N cells;
- and
- a switching module configured to:
- alternately connect a capacitance across a first of the adjacent ones of the N cells and a second of the adjacent ones of the N cells at a switching frequency when a difference in the output voltages of the adjacent ones of the N cells is greater than or equal to a first threshold, and
- stop alternately connecting the capacitance when the difference is less than or equal to a second threshold, wherein the first threshold is greater than the second threshold.
A system comprising:
- N cells connected in series in a rechargeable battery stack, where N is an integer greater than 1;
- and
- (N−1) cell balancing modules configured to balance output voltages of the N cells, wherein each of the (N−1) cell balancing modules balances output voltages of adjacent ones of the N cells, and wherein each of the (N−1) cell balancing modules includes:
- a communication module configured to communicate the output voltages of the adjacent ones of the N cells to others of the (N−1) cell balancing modules via a communication link;
- and
- a switching module configured to alternately connect a capacitance across a first of the adjacent ones of the N cells and a second of the adjacent ones of the N cells at a switching frequency when a difference in output voltages of two of the N cells is greater than or equal to a predetermined threshold.
Dependencies are inferred from the claim text.