US 11,936,231 B2
System and method for detecting electrical connection and disconnection on USB type-A charging port
Rakesh Kumar Polasa, Karnataka (IN); Satish Anand Verkila, Karnataka (IN); and Burle Naga Satyanarayana, Andhra Pradesh (IN)
Assigned to SILICONCH SYSTEMS PVT LTD, Karnataka (IN)
Filed by SILICONCH SYSTEMS PVT LTD, Karnataka (IN)
Filed on Dec. 12, 2022, as Appl. No. 18/079,158.
Application 18/079,158 is a division of application No. 16/898,113, filed on Jun. 10, 2020, granted, now 11,689,041.
Claims priority of application No. 202041016124 (IN), filed on Apr. 14, 2020.
Prior Publication US 2023/0106813 A1, Apr. 6, 2023
Int. Cl. H02J 7/00 (2006.01); H02M 3/07 (2006.01); H02M 3/156 (2006.01)
CPC H02J 7/00714 (2020.01) [H02J 7/0047 (2013.01); H02M 3/07 (2013.01); H02M 3/1563 (2013.01); H02J 2207/30 (2020.01)] 8 Claims
OG exemplary drawing
 
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.