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

Claim 7:
8. A power side detection circuit capable of detecting whether a foreign object exists on a function pin of a power side circuitry, wherein the power side circuitry is a power supplier side circuitry or a power receiver side circuitry, wherein the power supplier side circuitry and the power receiver side circuitry are coupled to each other in a detachable fashion, and wherein the power supplier side circuitry is configured to operably supply power to the power receiver side circuitry; the power side detection circuit comprising:
a discharging circuit including a switch, wherein the switch is electrically connected to the function pin and a capacitor, wherein the switch is configured to operably discharge the capacitor via the function pin, wherein the capacitor is electrically connected to the function pin;
a current source circuit, which is electrically connected to the function pin and the capacitor, wherein the current source circuit is configured to operably provide a sensing current flowing through the function pin, to charge the capacitor; and
a foreign object detection circuit, which is configured to operably sense a voltage variation of the function pin during a predetermined period and is configured to operably compare the voltage variation with a predetermined variation, so as to determine whether the foreign object exists on the function pin;
wherein the foreign object detection circuit is configured to operably sense the voltage variation of the function pin during the predetermined period via 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.