Battery management system and method of driving the same
First Claim
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1. A battery management system, comprising:
- a first charge circuit connected between a first terminal of a charger and a first terminal of a battery cell, wherein the first charge circuit controls charging the battery cell with a first current;
a first switch having a first terminal connected to a second terminal of the battery cell, wherein the first switch switches charging of the battery cell by control of the first charge circuit;
a second switch between a second terminal of the first switch and a second terminal of the charger, wherein the second switch switches charging of the battery cell to correspond to a value of an output signal of the charger;
a second charge circuit connected between the first terminal of the charger and the first terminal of the battery cell, wherein the second charge circuit controls charging the battery cell with a second current, the second current being higher than the first current;
a third switch having a first terminal connected to the second terminal of the battery cell, wherein the third switch switches charging of the battery cell by control of the second charge circuit; and
a fourth switch between a second terminal of the third switch and the second terminal of the charger, wherein the fourth switch switches charging of the battery cell to correspond to a value of the output signal of the charger.
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Abstract
A battery management system and a method of driving the same are provided. When the output signal of a charger is higher than a first voltage, a battery cell is charged with a first current by a first charge circuit. When the output signal of the charger is higher than a second voltage, a battery cell is charged with a second current by a second charge circuit. The second voltage is higher than the first voltage and second current is higher than the first current.
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Citations
15 Claims
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1. A battery management system, comprising:
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a first charge circuit connected between a first terminal of a charger and a first terminal of a battery cell, wherein the first charge circuit controls charging the battery cell with a first current; a first switch having a first terminal connected to a second terminal of the battery cell, wherein the first switch switches charging of the battery cell by control of the first charge circuit; a second switch between a second terminal of the first switch and a second terminal of the charger, wherein the second switch switches charging of the battery cell to correspond to a value of an output signal of the charger; a second charge circuit connected between the first terminal of the charger and the first terminal of the battery cell, wherein the second charge circuit controls charging the battery cell with a second current, the second current being higher than the first current; a third switch having a first terminal connected to the second terminal of the battery cell, wherein the third switch switches charging of the battery cell by control of the second charge circuit; and a fourth switch between a second terminal of the third switch and the second terminal of the charger, wherein the fourth switch switches charging of the battery cell to correspond to a value of the output signal of the charger. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of driving a battery management system that controls a charge operation from a charger to a battery cell by a battery management circuit, the battery management circuit including first and second charge current paths, the first and second charging current paths connected in parallel between the charger and the battery cell, the method comprising:
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measuring a charge voltage of the charger, the charge voltage to be supplied to the battery management circuit; charging, when the charge voltage of the charger is higher than a first voltage, the battery cell with a first current through the first charge current path of the battery management circuit; and charging, when the charge voltage of the charger is higher than a second voltage higher than the first voltage, the battery cell with a second current through the second charge current path of the battery management circuit, the second current being higher than the first current; wherein charging the battery cell with the first current includes, when the charge voltage of the charger is higher than the first voltage, turning on first and second switches of the battery management circuit, the first switch having a first terminal connected to a second terminal of the battery cell, and the second switch being between a second terminal of the first switch and a second terminal of the charger and wherein charging the battery cell with the second current includes, when the charge voltage of the charger is higher than the second voltage, turning on third and fourth switches of the battery management circuit, the third switch having a first terminal connected to the second terminal of the battery cell, and the fourth switch being connected between a second terminal of the third switch and the second terminal of the charger. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification