Circuit for charging supplemental battery in portable electronic device
First Claim
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1. A circuit for charging a supplemental battery of a portable electronic device providing a main power supply, comprising:
- a charge pump integrated circuit (IC) receiving voltage from the main power supply; and
a low drop out linear regulator (LDO) receiving voltage from the charge pump IC and outputting voltage to the supplemental battery.
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Abstract
A charge pump IC and LDO are provided between the main power supply of a portable electronic device and a supplemental battery to control charge current and voltage to the supplemental battery using a small internally-packaged circuit.
19 Citations
28 Claims
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1. A circuit for charging a supplemental battery of a portable electronic device providing a main power supply, comprising:
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a charge pump integrated circuit (IC) receiving voltage from the main power supply; and
a low drop out linear regulator (LDO) receiving voltage from the charge pump IC and outputting voltage to the supplemental battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A portable electronic device, comprising:
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at least one primary power source;
at least one supplemental power source;
charging means internal to the device for controlling the charging of the supplemental power source, the charging means including constant current means coupled to maximum voltage means for providing a constant current to the supplemental power source up to a first voltage, and then providing constant voltage to the supplemental power source. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A portable electronic device, comprising:
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electronic circuitry;
a main battery powering at least portions of the circuitry;
a supplemental battery powering at least portions of the circuitry at least from time to time;
a current limiting device limiting a charge current to the supplemental battery to no more than a maximum charge current; and
a voltage limiting device limiting a charge voltage to the supplemental battery to no more than a maximum charge voltage. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification