Method for forced power supply and power-supply device

A technology of forced power supply and power receiving end equipment, which is applied in the field of communication and can solve the problem of inability to safely supply power to non-PD equipment

CN103067182AActive Publication Date: 2013-04-24SHANGHAI HUAWEI TECH CO LTD
4 Cites 12 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-04-24

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for forced power supply and a power-supply device. The method for the forced power supply includes obtaining of electrical parameters of a network device. The electrical parameters at least include a detected resistance value, a detected capacitive reactance value, a detected voltage value and a detected current value. According to the obtained electrical parameters, the network device is judged whether to be in a status of short circuits or open circuits or not. If the network device is not in the status of the short circuits or the open circuits, the network device is judged to be whether a non-receiving-end device or not according to the obtained electrical parameters, wherein the non-receiving-end device is characterized in that a detected resistance value is smaller than 15 kilohm (k Omega), a detected resistance value is larger than 33komega, or a detected capacitive reactance is larger than 10 microfarad (Mu F). If the network device is a non-power device (PD), power is supplied to the non-receiving-end device. Not only can the power be supplied in force to the non-PD, meanwhile but also damage risks to a backward stage device after the forced power supply can be avoided.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the technical field of communication, in particular to a method and power supply equipment for forced power supply. Background technique

[0002] At present, Power over Ethernet (PoE, Power over Ethernet) technology is used more and more. In the case of no change in the existing Ethernet infrastructure, this technology can transmit data signals for some IP-based terminals. DC power can be provided for such devices. A complete PoE system includes: power supply equipment (PSE, Power-Sourcing Equipment) and powered equipment (PD, PowerDevice). PSE is a device that supplies power to Ethernet client devices and is also the manager of the entire PoE. The PD is the PSE load that receives power, that is, the client device of the PoE system. The two establish a connection based on the IEEE802.3at standard, and realize that the PSE supplies power to the PD.

[0003] In the prior art, in order to meet the PoE power supply prot...

Examples

Embodiment 1

[0044] An embodiment of the present invention provides a method for forcing power supply, such as figure 2 As shown, the method includes:

[0045] In step S100, the electrical parameters of the network equipment are obtained, the electrical parameters at least include: a detected resistance value, a detected capacitive reactance value, a detected voltage value, and a detected current value. Wherein, the network device specifically refers to a load connected to the PSE network.

[0046] Step S102, judging whether the network device is in a short-circuit or open-circuit state according to the acquired electrical parameters.

[0047]When the difference between the safety ground voltage VAGND and the PSE output voltage VOUT is less than 1V, that is, VAGND-VOUT_<1V, it is judged that the network device is in a short circuit state; when the detected current is less than 20 microamperes (uA), it is judged that the network device is in an open circuit state .

[0048] Step S104, w...

Embodiment 2

[0052] An embodiment of the present invention provides a method for forcing power supply, such as image 3 As shown, the method includes:

[0053] Step 200: The PSE detects electrical parameters of the network equipment, and the electrical parameters at least include: a detected resistance value, a detected capacitive reactance value, a detected voltage value, and a detected current value.

[0054] Wherein, the PSE detects the electrical parameters of the network equipment specifically may be to detect the electrical parameters on the output line pair of the power supply, for example figure 1 Detect the electrical parameters on the power line pairs 1, 2 and / or 3, 6.

[0055] In step S202, the PSE judges whether the network device is in a short-circuit or open-circuit state according to the detected electrical parameters.

[0056] Specifically, when VAGND-VOUT_<1V, it is judged that the network device is in a short circuit state; when the detected current is less than 20 micr...

Embodiment 3

[0066] An embodiment of the present invention provides a power supply device, such as Figure 4 As shown, the power supply device includes: an acquisition unit 401 , a first judgment unit 402 , a second judgment unit 403 , and a power supply unit 404 .

[0067] The acquiring unit 401 is configured to acquire electrical parameters of network equipment, where the electrical parameters at least include: a detected resistance value, a detected capacitive reactance value, a detected voltage value, and a detected current value.

[0068] The first judging unit 402 is configured to judge whether the network device is in a short-circuit or open-circuit state according to the obtained electrical parameters. Specifically, the first judging unit 402 can judge that the network device is in a short-circuit state when VAGND-VOUT_<1V; when the detected current is less than 20 microamperes (uA), judge that the network device is in an open-circuit state.

[0069] The second judging unit 403 is...