Universal serial bus charger circuit and charging method
First Claim
1. A universal serial bus (USB) charging circuit, comprising:
- a charging path for charging a battery from a USB host;
a charging switch located on the charging path;
a current sensing circuit for sensing current information on the charging path;
a maximum available current detection circuit for detecting a maximum available current from the USB host; and
a loop controller circuit for controlling the charging switch so that the charging current on the charging path is substantially equal to the maximum available current detected by the maximum available current detection circuit,wherein the maximum available current detection circuit detects the maximum available current during only circuit initialization and circuit rebooting, and stores the maximum available current, and wherein when the charging current is higher than that the USB host can supply, the USB charging circuit is automatically shut down and rebooted, and the maximum available current is updated according to a detected condition during circuit rebooting.
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Accused Products
Abstract
The present invention discloses a universal serial bus (USB) charging circuit, comprising: a charging path for charging a battery from a USB host; a charging switch located on the charging path; a current sensing circuit for sensing current information on the charging path; a maximum available current detection circuit for detecting the maximum available current from the USB host; and a loop controller circuit for controlling the charging switch so that the charging current on the charging path is substantially equal to the maximum available current detected by the maximum available current detection circuit, wherein the maximum available current detection circuit detects the maximum available current during circuit initialization and stores it.
11 Citations
12 Claims
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1. A universal serial bus (USB) charging circuit, comprising:
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a charging path for charging a battery from a USB host; a charging switch located on the charging path; a current sensing circuit for sensing current information on the charging path; a maximum available current detection circuit for detecting a maximum available current from the USB host; and a loop controller circuit for controlling the charging switch so that the charging current on the charging path is substantially equal to the maximum available current detected by the maximum available current detection circuit, wherein the maximum available current detection circuit detects the maximum available current during only circuit initialization and circuit rebooting, and stores the maximum available current, and wherein when the charging current is higher than that the USB host can supply, the USB charging circuit is automatically shut down and rebooted, and the maximum available current is updated according to a detected condition during circuit rebooting. - View Dependent Claims (2)
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3. A universal serial bus (USB) charging circuit, comprising:
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a charging path for charging a battery from a USB host; a charging switch located on the charging path; a current sensing circuit for sensing current information on the charging path; a maximum available current detection circuit for detecting a maximum available current from the USB host; and a loop controller circuit for controlling the charging switch so that the charging current on the charging path is substantially equal to the maximum available current detected by the maximum available current detection circuit, wherein the maximum available current detection circuit detects the maximum available current during only circuit initialization and circuit rebooting, and stores the maximum available current, and wherein the USB charging circuit is periodically shut down and rebooted, and the maximum available current is updated according to a detected condition during circuit rebooting. - View Dependent Claims (4, 5, 6)
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7. A USB charging method comprising:
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providing a charging circuit, which includes a charging path for charging a battery from a USB host; detecting a maximum available current from the USB host during only circuit initialization and circuit rebooting and stores the maximum available current; making a charging current on the charging path equal to the stored maximum available current; when the charging current is higher than that the USB host can supply, automatically shutting down and rebooting the USB charging circuit; and updating the maximum available current according to a detected condition during circuit rebooting. - View Dependent Claims (8)
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9. A USB charging method comprising:
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providing a charging circuit, which includes a charging path for charging a battery from a USB host; detecting a maximum available current from the USB host during only circuit initialization and circuit rebooting and stores the maximum available current; making a charging current on the charging path equal to the stored maximum available current; periodically shutting down and rebooting the USB charging circuit; and updating the maximum available current according to a detected condition during circuit. - View Dependent Claims (10, 11, 12)
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Specification