Patent ID: 11936231
Assignee: SILICONCH SYSTEMS PVT LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 6:
7. A method for detecting electrical connection and disconnection on an USB type-A charging port of an USB device comprising one or more USB ports, the method comprising:
maintaining, by a charge pump operatively coupled to the USB device, upon activation, VBUS voltage at around a predetermined voltage and a current within a first range of values;
monitoring, using a current sense differential amplifier operatively coupled to a control unit, VBUS current flowing on VBUS pin of the USB device, in an USB type-A connected state, through an external sense resistor, and amplifying the monitored VBUS current,
wherein, when the monitored VBUS current is less than a predetermined current, for a pre-configured time window, detecting a potential disconnected state of the connected USB type-A port; and

monitoring, using a voltage detection comparator, the VBUS voltage to compare the monitored VBUS voltage with a predetermined voltage to sense an external condition such that VBUS voltage drops from a load capacitance and a load current, and wherein when the VBUS voltage drops below the predetermined voltage, detecting the USB type-A connected state,
wherein in the USB type-A potential disconnected state, enabling and disabling a MOSFET switch in cycles such that when the MOSFET switch is enabled, an output VBUS capacitor is charged to the predetermined voltage and when the MOSFET switch is disabled, the output VBUS capacitor is configured to provide power to a load through a connected USB type-A port.