Patent ID: 11870596
Assignee: ZHEJIANG DAHUA TECHNOLOGY CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The power sourcing equipment of claim 4, wherein the resistor detection circuit includes:
a second switch, whose first end is coupled to the output terminal, configured to be turned on when the data signal detection circuit does not detect the data signal;
a voltage generation circuit, coupled to a second end of the second switch, configured to provide a voltage for the powered device when the second switch is turned on;
a current sampling circuit, coupled to the second end of the second switch, configured to sample a current of the output terminal to obtain a sampling current when the second switch is turned on;
a first resistor coupled to the current sampling circuit; and
a second processing sub-circuit configured to determine the resistance of the powered device based on a voltage across the first resistor and the sampling current.