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US 8,525,484 B2Granted
Charger and portable device having the same
AssigneeRichtek Technology Corporation
InventorsLi-Wei Lee, Nien-Hui Kung, Kwan-Jen Chu, Ying-Hsin Hsing
Life of this patent
Estimating the term…
Abstract
A charger for a portable device includes a USB detector connected to a data pin to detect the effective resistance on the data pin before a USB transceiver is enabled, to identify USB or adapter plug in and control a charging current for a battery accordingly.
Claims7
A charger comprising:
- a USB detector connected to a data pin, operative to detect an effective resistance on the data pin during a detection period to determine a first control signal and a second control signal;
- a power input terminal connected to a power input pin;
- a first power transistor connected to the power input terminal and controlled to supply a charging current;
- a charge current controller connected to the USB detector and a gate of the first power transistor, operative to control the charging current according to the second control signal;
- a power supply terminal;
- a second power transistor connected between the power input terminal and the power supply terminal;
- and
- a USB transceiver power controller connected to the USB detector and a gate of the second power transistor, operative to control the second power transistor to generate a regulated voltage at the power supply terminal according to the first control signal.
5 more elements
A portable device comprising:
- a data pin;
- a USB transceiver connected to the data pin;
- a power input pin;
- and
- a charger connected to the data pin and connected between the power input pin and the USB transceiver, operative to detect an effective resistance on the data pin during a detection period to control a charging current, said charger including a USB detector connected to the data pin, operative to detect the effective resistance on the data pin during the detection period;
- a power input terminal connected to the power input pin;
- a first power transistor connected to the power input terminal and controlled to supply the charging current;
- a charge current controller connected to the USB detector and a gate of the first power transistor, operative to control the charging current according to the second control signal;
- a power supply terminal connected to the USB transceiver;
- a second power transistor connected between the power input terminal and the power supply terminal;
- and
- a USB transceiver power controller connected to the USB detector and a gate of the second power transistor, operative to control the second power transistor according to the first control signal, to provide power for the USB transceiver;
- wherein the charger determines a setting of the charging current, which has a first value when USB plug in is detected and a second value greater than the first value when adapter plug in is detected.
10 more elements
Dependencies are inferred from the claim text.