Patent ID: 11862964
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method for protecting against an overvoltage in a universal serial bus (USB) device, the method comprising:
monitoring a voltage on a pin of a USB receptacle;
turning off an overvoltage protection (OVP) switch having a first transistor and a second transistor connected in parallel to each other, the OVP switch connected to the pin of the USB receptacle when an overvoltage is detected, such that power between the pin and the USB device is interrupted;
turning on the OVP switch when the overvoltage is eliminated; and
determining whether the USB device is operating in a normal mode or a low-power mode, wherein:
a first voltage difference between a control signal supplied to the OVP switch when the overvoltage is not detected and the control signal supplied to the OVP switch when the overvoltage is detected when operating in the normal mode is greater than a second voltage difference between the control signal supplied to the OVP switch when the overvoltage is not detected and the control signal supplied to the OVP switch when the overvoltage is detected when operating in the low-power mode,
the voltage of the control signal is the same in the normal mode and the low-power mode when the overvoltage is detected, and
providing, by a switch controller, a third voltage to the OVP switch in the normal mode and the low-power mode so that the OVP switch turns off,
providing, by the switch controller, a first voltage to the first transistor in the normal mode so that the first transistor turns on, and
providing, by the switch controller, the third voltage to the first transistor in the low-power mode so that the first transistor turns off.