BAND FILTER DETECTION APPARATUS, POWER SOURCING EQUIPMENT AND SYSTEM

This application discloses a filtering detection apparatus used in a power sourcing equipment PSE. The filtering detection apparatus includes a power supply control circuit and an adaptive filter circuit. The power supply control circuit includes a power supply channel and a detection module. The power supply channel includes a control switch, configured to control on and off of the power supply channel. The detection module is configured to send a detection signal to the power supply channel, so as to detect whether a peer device connected to the power supply channel is a valid powered device. The control switch is turned off in a detection process of the power supply channel. The adaptive filter circuit is configured to filter noise in the detection signal in the detection process of the power supply channel. This resolves a problem that noise from a power supply in the PSE affects accuracy of a detection result, which causes a valid powered device to fail to be powered on normally.