Battery balancing including resonant frequency compensation
First Claim
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1. A device, comprising:
- a plurality of balancing circuits, coupled to each of a plurality of coupled battery cells, that conduct current to and from the plurality of coupled battery cells;
a share bus, coupled to at least each of the plurality of balancing circuits; and
a phase locked loop controller, coupled to at least the share bus and the plurality of balancing circuits, that controls a driving frequency for the plurality of balancing circuits by detecting an overall resonant frequency of the plurality of balancing circuits through the share bus and adjusting the driving frequency produced by the phase locked loop controller to match the overall resonant frequency.
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Abstract
A system for balancing charge between a plurality of storage battery cells within a storage battery. The battery balancing system sense changes, possibly caused by environmental influences, in the overall resonant frequency of charge balancing circuits contained within the battery balancing system. Using a phase locked loop based controller, the battery balancing system compensates for the change in resonant frequency by driving the battery balancing circuits at a frequency that matches the actual sensed resonant frequency of the battery balancing circuits.
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Citations
18 Claims
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1. A device, comprising:
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a plurality of balancing circuits, coupled to each of a plurality of coupled battery cells, that conduct current to and from the plurality of coupled battery cells; a share bus, coupled to at least each of the plurality of balancing circuits; and a phase locked loop controller, coupled to at least the share bus and the plurality of balancing circuits, that controls a driving frequency for the plurality of balancing circuits by detecting an overall resonant frequency of the plurality of balancing circuits through the share bus and adjusting the driving frequency produced by the phase locked loop controller to match the overall resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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detecting an overall resonant frequency of a plurality of balancing circuits in a battery balancing system, each of the balancing circuits being coupled to at least a share bus and a battery cell; and adjusting a driving frequency that drives the plurality of battery balancing circuits to match the overall resonant frequency, the driving frequency being produced by a phase locked loop controller coupled to at least the share bus and the plurality of battery balancing circuits. - View Dependent Claims (11, 12, 13, 14)
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15. A system, comprising:
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a battery balancing system including a plurality of balancing circuits, coupled to each of a plurality of coupled battery cells, that conduct current to and from the plurality of battery cells; a share bus, coupled to at least each of the plurality of balancing circuits; and a phase locked loop controller, coupled to at least the share bus and the plurality of balancing circuits, that controls a driving frequency for the plurality of balancing circuits by detecting an overall resonant frequency of the plurality of balancing circuits through the share bus and adjusting a driving frequency produced by the phase locked loop controller to match the overall resonant frequency. - View Dependent Claims (16, 17, 18)
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Specification