Power management circuit and methodology for battery-powered systems
First Claim
1. For a battery powered application, a power management method, comprising steps for:
- supplying a current to the battery for a charging period to charge the battery; and
controlling the charging period in accordance with current magnitude.
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Accused Products
Abstract
A power management system including a battery-powered application, in which an input current is supplied by a source of current that may be a current-constrained source, such as a USB port, to a battery for charging the battery and to an application load. Battery charging current is supplied to the battery for a period of time based on magnitude of battery charging current, so that charging current of lesser magnitude is applied to the battery for a greater period of time. In accord with one implementation, battery charging current is determined by monitoring the difference between a programmed charging current, dependent on battery type, and magnitude of current used by the load. Change of battery charging current due to voltage mode charging, when charge current begins to drop as the battery approaches full charge, is detected, and in response, the charging period is set to a fixed charging period based on the battery.
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Citations
20 Claims
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1. For a battery powered application, a power management method, comprising steps for:
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supplying a current to the battery for a charging period to charge the battery; and
controlling the charging period in accordance with current magnitude. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power management system for implementation in a battery powered application, comprising:
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an input current node to which a current source is applied for providing input current to a battery and a load;
a first circuit coupled to the input current node and configured for supplying a charging current to the battery for a charging period;
a second circuit configured for determining magnitude of current supplied to the battery by the first circuit; and
a third circuit, coupled to the first circuit and responsive to magnitude of the charging current, for controlling the charging period. - View Dependent Claims (8, 9, 10, 11)
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12. A power management system for implementation in a battery powered application, comprising:
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an input current source for supplying an input current to a battery and a load;
a load current monitor circuit for determining load current magnitude;
a variable period timer;
a charging circuit coupled to the timer for controlling supply of current to the battery for a charging period determined by the timer; and
a control circuit responsive to load current magnitude for controlling the timer period. - View Dependent Claims (13, 14, 15, 16, 17, 19)
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18. A power management system for implementation in a battery powered application, comprising:
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an input current source for supplying input current to (1) a battery for charging the battery and (2) a load;
first means for determining battery current magnitude;
a variable period timer;
second means for controlling supply of current to the battery for a charging period determined by the timer; and
third means for controlling the timer period in accordance with magnitude of battery current. - View Dependent Claims (20)
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Specification