Patent ID: 11953645
Assignee: RICHTEK TECHNOLOGY CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A foreign object detection method, which is configured to operably detect whether a foreign object exists on a function pin of a power supplier side or a power receiver side, wherein the power supplier side and the power receiver side are coupled to each other in a detachable fashion; the foreign object detection method comprising:
discharging a capacitor via the function pin, wherein the capacitor is electrically connected to the function pin;
providing a sensing current flowing through the function pin, to charge the capacitor;
sensing a voltage variation of the function pin during a predetermined period; and
comparing the voltage variation with a predetermined variation, so as to determine whether the foreign object exists on the function pin;
wherein the step of sensing the voltage variation of the function pin during the predetermined period includes the following steps:
sensing an initial voltage of the function pin at a starting time point of the predetermined period, wherein the starting time point is posterior to the step of discharging the capacitor via the function pin, and the starting time point is prior to the step of providing the sensing current flowing through the function pin to charge the capacitor;
sensing a duration voltage of the function pin at a predetermined time point of the predetermined period; and
sensing a termination voltage of the function pin at a termination time point of the predetermined period, wherein the termination time point is posterior to the predetermined time point.