POE load detecting method and power supply terminal equipment

Abstract

The invention discloses a POE load detecting method and power supply terminal equipment. The method comprises the steps that the power supply terminal equipment PSE outputs a first specified voltage value at the output end of a POE control circuit, equivalent additional resistance is detected when no load exists between the POE power supply wire pair; a second specified voltage value is outputtedat the output end of the POE control circuit, first resistance between the POE power supply wire pair is obtained via detection so as to take the first resistance as the parallel equivalent resistance of the equivalent additional resistance and the load resistance; the resistance value of the load resistance is obtained according to the detected first resistance and the equivalent additional resistance so as to determine whether the load resistance value meets preset judging conditions, and the externally connected receiving end equipment PD is determined to be effective if the judging conditions are met. The method and the equipment provided by the invention can detect the equivalent additional resistance, thereby reducing the erroneous judgment on the effectiveness of the externally connected PD.

Description

technical field [0001] The invention relates to the field of network technology, in particular to a POE load detection method and power supply terminal equipment in the process of power supply over Ethernet. Background technique [0002] Power Over Ethernet (POE for short) refers to powering some Ethernet-based terminals (such as IP phones, wireless LAN access points, network camera, etc.) while transmitting data signals, it can also provide DC power supply technology for such devices. A complete POE system includes two parts: power supply equipment (PSE, Power Sourcing Equipment) and power receiving equipment (PD, Power Device). [0003] The Power Sourcing Equipment (PSE) is used to supply power to the Ethernet client device, is responsible for injecting DC power into the Ethernet cable, and also manages the entire POE Power over Ethernet process. [0004] The Power Device (PD) is the PSE load that receives power, that is, the client device of the POE system, such as IP p...

AI Technical Summary

Problems solved by technology

However, in the process of POE detection, this resistance is connected in parallel with the effective PD characteristic resistance (RE / / RPD), and the characteristic resistance detected by the PSE becomes smaller, which often makes the PSE terminal judge that the PD load is invalid, so it cannot supply power to the device.

[0020] 2. After the network equipment has been used for a long time, there may be sundries between the pins of the RJ45 or network transformer, and these sundries may also have a certain equivalent on-resistance RE

Same as the first case, there is an on-resistance in the circuit that does not affect the normal operation, making the POE device unable to supply power

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