System and method for detecting electrical connection and disconnection on USB Type-A charging port
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United States of America Patent
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Jun 27, 2023
Grant Date -
Oct 14, 2021
app pub date -
Jun 10, 2020
filing date -
Apr 14, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
Systems and methods for detecting electrical connection and disconnection on an USB Type-A charging port like power adapters, power banks and car chargers having one or more USB Type-A charging port of an USB device. The system includes: a voltage source; a MOSFET SWITCH gate driver, in USB type-A connected state, that operatively couples MOSFET SWITCH with voltage source and VBUS supply of USB type-A port; charge pump; a current sense differential amplifier; and a control unit configured to: monitor VBUS current, and detect potential disconnected state of connected USB type-A port; and monitor VBUS voltage and compare VBUS voltage with predetermined voltage to sense external condition such that VBUS voltage drops because of load capacitance and load current. The control unit is further configured to, when the duty cycle has reached a minimum VBUS current, detect the USB type-A disconnection with a charge pump state.
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