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

Claim 0:
1. A method for detecting electrical connection and disconnecting 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 a source side of the USB device, upon activation, VBUS voltage at around 5V 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.