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AssigneeLenovo (Singapore) Pte. Ltd.
InventorsSHIGEFUMI ODAOHHARA, NOZOMU NAGATA
Estimating the term…
A power system within a portable electronic device is disclosed. In order to discharge electricity stored in a rechargeable battery within the portable electronic device to a discharge cutoff voltage, a charge booster charges the rechargeable battery with electric power coming from an AC/DC adaptor. When the AC/DC adaptor is detached, the charge booster performs boosting operation to supply power to a load from the rechargeable battery. The charge booster operates only when input voltage of the load decreases. A direct discharge circuit operates in conjunction with the charge booster, and when the charge booster does not perform any boosting operation, electric power is supplied directly from the rechargeable battery to a DC/DC converter. The charge booster can keep the input voltage of the DC/DC converter until the voltage reaches a discharge cutoff voltage of the rechargeable battery, and then stops operation when electric power is being supplied from the direct discharge circuit.
A power system comprising:
A portable electronic device comprising:
A method comprising:
The method of claim 12, wherein said method further includes stopping power supply from said charge booster and supplying power from said bypass circuit to said load when input voltage of said load is at a second threshold that is higher than said first threshold.
The method of claim 12, wherein said method further includes charging said rechargeable battery by said switching regulator when power is supplied from an AC/DC adaptor, wherein said charge booster includes a synchronous rectification type switching regulator.
Dependencies are inferred from the claim text.