USB Charger
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United States of America Patent
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N/A
Issued Date -
Jan 26, 2012
app pub date -
Jul 21, 2010
filing date -
Jul 21, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A USB charger comprises a power input, a microprocessor, a resistor network, and a USB port for charging electronic devices through the USB port. The USB charger defaults to provide 2000 mA when power is applied through the power input. When a device is detected at the USB port, it measures device current drain to determine if it is charging. If the device is charging, then it remains in the 2000 mA charging mode. If no current drain is detected, the power supply switches to 1000 mA. If the electronic device recognizes the proper charging network it will begin charging. When the microprocessor detects current drain, it leaves the charging network as is. If still no current drain is detected, the USB microprocessor will attempt the 500 mA charging current. If there is a current drain, it will leave the charging network as is. If no current drain is detected, then it indicates a fault and a LED flashes to indicate the fault.
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