Charging Circuit for Parallel Charging in Multiple Battery Systems
First Claim
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1. A power supply system comprising:
- a charging control circuit for controlling a system charging parameter provided by a DC to DC converter to a plurality of batteries configured to be coupled in parallel, said charging control circuit further configured to monitor a charging current and a battery charging voltage provided to each of a plurality of batteries; and
a regulating circuit configured to reduce said system charging parameter provided to said plurality of batteries if a first battery charging current exceeds a first maximum charging current level or a second battery charging current exceeds a second maximum charging current level, or a first battery charging voltage exceeds a first maximum charging voltage level, or a second battery charging voltage exceeds a second maximum charging voltage level.
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Abstract
A charging circuit for controlling a system charging parameter provided to a host of rechargeable batteries, wherein the host of batteries includes at least a first battery and second battery that may be coupled in parallel. The charging circuit provides for fast charging of rechargeable batteries in parallel. Independent current and voltage sensing for each battery enables parallel charging of batteries at different charging currents. The charging circuit may be configured to accept either analog or digital signals from an associated power management unit.
38 Citations
20 Claims
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1. A power supply system comprising:
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a charging control circuit for controlling a system charging parameter provided by a DC to DC converter to a plurality of batteries configured to be coupled in parallel, said charging control circuit further configured to monitor a charging current and a battery charging voltage provided to each of a plurality of batteries; and a regulating circuit configured to reduce said system charging parameter provided to said plurality of batteries if a first battery charging current exceeds a first maximum charging current level or a second battery charging current exceeds a second maximum charging current level, or a first battery charging voltage exceeds a first maximum charging voltage level, or a second battery charging voltage exceeds a second maximum charging voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11)
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8. A method for controlling a system charging parameter comprising:
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providing a control signal to a DC to DC converter by a regulating circuit; monitoring a charging current and a battery charging voltage provided to each of a plurality of batteries configured to be coupled in parallel; and reducing said system charging parameter provided to a plurality of batteries that may be coupled in parallel, if a first battery charging current exceeds a first maximum charging current level or a second battery charging current exceeds a second maximum charging current level, or a first battery charging voltage exceeds a first maximum charging voltage level, or a second battery charging voltage exceeds a second maximum charging voltage level. - View Dependent Claims (9, 10)
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12. An electronic device comprising:
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a DC to DC converter; a power management unit configured to provide an output signal representative of at least a first maximum charging current level, a second maximum charging current level, a first maximum charging voltage level, and a second maximum charging voltage level; a charging control circuit for controlling a system charging parameter provided by said DC to DC converter to said plurality of batteries, said charging control circuit further configured to monitor a charging current and a battery charging voltage provided to each of a plurality of batteries configured to be coupled in parallel; and a regulating circuit configured to reduce said system charging parameter provided to said plurality of batteries if a first battery charging current exceeds a first maximum charging current level or a second battery charging current exceeds a second maximum charging current level, or a first battery charging voltage exceeds a first maximum charging voltage level, or a second battery charging voltage exceeds a second maximum charging voltage level. - View Dependent Claims (13, 14, 15, 16, 17, 18, 20)
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19. An electronic device comprising:
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a power management unit (PMU) configured to run a power management routine; a charging circuit, a DC to DC converter configured to be coupled to a DC power source; a selector output circuit configured to provide selector output signals that control selection among a DC power source and a host of rechargeable batteries configured to be coupled in parallel, said selector output circuit providing said selector output signals in response to a power management unit (PMU) output signal from said PMU; a charging control circuit configured to control charging of said host of rechargeable batteries, said charging control circuit further configured to monitor a charging current and a battery charging voltage provided to each of a plurality of said host of batteries; and a regulating circuit configured to reduce said system charging parameter provided to said plurality of batteries if a first battery charging current exceeds a first maximum charging current level or a second battery charging current exceeds a second maximum charging current level, or a first battery charging voltage exceeds a first maximum charging voltage level, or a second battery charging voltage exceeds a second maximum charging voltage level.
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Specification