CHARGE ON DEMAND CONTROL SYSTEM
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United States of America Patent
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Feb 8, 2017
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Feb 8, 2016
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Abstract
A system for controlling whether a battery powered device tethered to a host via a Universal Serial Bus (USB) interface will charge its battery via the USB connection. A USB interface adapter is programmed to control charging of the device battery based on whether a standard data terminal ready (DTR) signal is received from the host through a USB to RS-232 converter. Data packets are sent via the USB data line and interpreted as a DTR signal by the USB to Serial adapter. The dedicated DTR output pin from the adapter is thus used to control the charging circuit.
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