METHOD AND SYSTEM FOR RATIONING CHARGE OR ENERGY PROVIDED TO A PORTABLE DEVICE
First Claim
1. A charging system for rationing a cumulative charge or a cumulative energy supplied from a host to a portable device, the charging system comprising:
- a power switch;
a current sensing module, connected to the power switch, for detecting an instantaneous current drawn by the portable device;
a converter, at the output of the current sensing module, for converting the instantaneous current into a digital current value;
a current register connected to the current sensing module for storing the digital current value;
a timing module generating elapsed time information;
a charge register storing a cumulative charge value, the cumulative charge value obtained by multiplying the digital current value with the elapsed time information;
a threshold database storing a threshold value;
a rationing module configured for;
continuously comparing a cumulative value with the threshold value; and
generating a control signal when the cumulative value exceeds the threshold value.
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Accused Products
Abstract
A charging method and system for rationing charge or energy supplied by a host to a portable device. The system includes a power switch, and a current sensing module connected to the power switch. The current sensing module detects instantaneous current drawn by the portable device. The system further includes a current register connected to the current sensing module for storing the instantaneous current value. A timing module generates timing information. The system also includes a charge register storing a cumulative charge drawn by the portable device. The cumulative charge is obtained by multiplying the instantaneous current value with the timing information. A threshold database stores a threshold value, and a rationing module connected to the host and the charge register continuously compares the cumulative charge value with the threshold charge value. When the cumulative charge value exceeds the threshold charge value, a control signal is generated.
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Citations
20 Claims
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1. A charging system for rationing a cumulative charge or a cumulative energy supplied from a host to a portable device, the charging system comprising:
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a power switch; a current sensing module, connected to the power switch, for detecting an instantaneous current drawn by the portable device; a converter, at the output of the current sensing module, for converting the instantaneous current into a digital current value; a current register connected to the current sensing module for storing the digital current value; a timing module generating elapsed time information; a charge register storing a cumulative charge value, the cumulative charge value obtained by multiplying the digital current value with the elapsed time information; a threshold database storing a threshold value; a rationing module configured for; continuously comparing a cumulative value with the threshold value; and generating a control signal when the cumulative value exceeds the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for rationing a cumulative charge or energy supplied from a host to a portable device over a universal serial bus (USB) port, the method comprising:
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sensing an instantaneous current drawn by the portable device; converting the instantaneous current into a digital current value; storing the digital current value; determining an elapsed time from beginning of charging to current time multiplying the digital current value with the elapsed time to obtain a cumulative charge value; storing the cumulative charge value; storing a threshold value; comparing a cumulative value with the threshold value; and generating a control signal if the cumulative value exceeds the threshold value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification