CHARGING CIRCUIT
First Claim
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1. A charging circuit for charging a portable electronic device from a power supply, the charging circuit comprising:
- a port configured to be coupled to the portable electronic device;
a power switch coupled to the port and configured to be coupled to the power supply, the power switch switchable between an open state and a closed state; and
a control circuit coupled to the power switch and the port, the control circuit operable to control the power switch based on an amount of charging current drawn by the portable electronic device through the port.
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Abstract
A charging circuit for charging a portable electronic device includes a port configured to be coupled to the portable electronic device, a power switch coupled to the port and configured to be coupled to a power supply, and a control circuit coupled to the power switch and the port. The power switch is switchable between an open state and a closed state. The control circuit is operable to control the power switch based on an amount of charging current drawn by the portable electronic device through the port.
16 Citations
21 Claims
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1. A charging circuit for charging a portable electronic device from a power supply, the charging circuit comprising:
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a port configured to be coupled to the portable electronic device; a power switch coupled to the port and configured to be coupled to the power supply, the power switch switchable between an open state and a closed state; and a control circuit coupled to the power switch and the port, the control circuit operable to control the power switch based on an amount of charging current drawn by the portable electronic device through the port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A charging circuit for charging a portable electronic device from a power supply, the charging circuit comprising:
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a port configured to be coupled to the portable electronic device; a power switch coupled to the port and configured to be coupled to the power supply, the power switch switchable between an open state and a closed state; an oscillator coupled to the power switch, the oscillator operable to oscillate the power switch between the open state and the closed state; a current-to-voltage converter coupled to the port and the power switch, the current-to-voltage converter operable to convert an amount of current drawn by the portable electronic device through the port into a voltage; and a comparator coupled to the oscillator and the current-to-voltage converter, the comparator operable to stop oscillation of the oscillator when the voltage exceeds a reference voltage to hold the power switch in the closed state and charge the portable electronic device. - View Dependent Claims (13, 14, 15, 16)
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17. A method of charging a portable electronic device with a charging circuit, the charging circuit including a port, a power switch coupled to a power supply, an oscillator coupled to the power switch, a current-to-voltage converter coupled to the port and the power switch, and a comparator coupled to the oscillator and the current-to-voltage converter, the method comprising:
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connecting the portable electronic device to the port; oscillating the power switch between an open state and a closed state; converting, by the current-to-voltage converter, a current drawn by the portable electronic device into a voltage; comparing, by the comparator, the voltage to a reference voltage; outputting a signal from the comparator to the oscillator to stop oscillation of the oscillator and hold the power switch in the closed state when the voltage meets a condition with respect to the reference voltage; and charging the portable electronic device while the power switch is in the closed state. - View Dependent Claims (18, 19, 20, 21)
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Specification