CN106712971B

CN106712971B - Protection device and system based on butt joint of Ethernet equipment with POE function

Info

Publication number: CN106712971B
Application number: CN201611165992.9A
Authority: CN
Inventors: 程星; 王小秋; 袁德芳; 卜京徽
Original assignee: Shanghai Gongjin Communication Technology Co Ltd
Current assignee: Shanghai Gongjin Communication Technology Co Ltd
Priority date: 2016-12-16
Filing date: 2016-12-16
Publication date: 2020-05-01
Anticipated expiration: 2036-12-16
Also published as: CN106712971A

Abstract

The invention relates to a protection device for butting Ethernet equipment based on a function with POE (Power over Ethernet), which comprises a PSE equipment protection module, wherein the PSE equipment protection module is used for preventing the PSE equipment from being burnt out when the PSE equipment is butted, and the PSE equipment protection module comprises: the device comprises a Schottky diode and a power supply output line, wherein the Schottky diode is used for stopping supplying power to the accessed POE equipment when the current of the POE equipment is overlarge; the protection system comprises a capacitor and a protection system, wherein the capacitor is used for preventing PSE equipment from being identified as PD equipment, the Schottky diode is connected with a power supply output line of the PSE, and the protection system is based on butt joint of Ethernet equipment with a POE function. By adopting the device and the system, the problem of equipment burnout caused by different power supply voltages or opposite polarities of the power supply voltages when two PSE equipment are butted is solved by adding the Schottky diode and the capacitor device, and the device and the system have wide application range.

Description

Protection device and system based on butt joint of Ethernet equipment with POE function

Technical Field

The invention relates to the technical field of network communication, in particular to the technical field of network equipment power supply, and specifically relates to a protection device and a protection system based on butt joint of Ethernet equipment with a POE function.

Background

POES is known as Power Over Ethernet, Power Over LAN (PoL) or Active Ethernet (Active Ethernet), sometimes also referred to simply as Power Over Ethernet, which is the latest standard specification for simultaneously transmitting data and electric Power using existing standard Ethernet transmission cables and maintains compatibility with existing Ethernet systems and users. The IEEE802.3af standard is a new standard based on POE, which adds a related standard for directly supplying power through a network cable on the basis of IEEE802.3, is an extension of the existing ethernet standard, and is the first international standard related to power distribution. The power can be supplied through 10BASE-T, 100BASE-TX and 1000BASE-T Ethernet networks, and the distance for reliable power supply is 100 meters at most. By the mode, the problem of centralized power supply of terminals such as IP phones, wireless APs, card readers, cameras and data acquisition can be effectively solved, and therefore wiring of an indoor power supply system is simplified. The non-standard POE devices are more, and the appearance is very similar to that of the PSE devices. If two PSE devices are docked, the devices are easily burned out. The invention can effectively solve the problems.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a protection device and a protection system which can realize voltage protection and prevent burning of Ethernet equipment with a POE function in butt joint.

In order to achieve the above object, the protection device and system based on the butt joint of the ethernet equipment with the POE function of the present invention comprises:

this protector based on take ethernet equipment butt joint of POE function, including PSE equipment protection module for prevent when PSE equipment docks PSE equipment burn out, PSE equipment protection module include:

the device comprises a Schottky diode and a power supply output line, wherein the Schottky diode is used for stopping supplying power to the accessed POE equipment when the current of the POE equipment is overlarge;

and the capacitor is used for preventing the PSE equipment from being identified as PD equipment, and the Schottky diode is connected with the PSE power supply output line.

Preferably, the capacitor is a ceramic capacitor.

The protection system comprises a transformer chip, a first inductor, a second inductor, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor and a Schottky diode, wherein the MCT1 end of the transformer chip is connected with the first end of the first inductor, the second end of the first inductor is respectively connected with the anode of the Schottky diode, the first end of the first capacitor and the cathode of the voltage input end connected to the POE device, the MCT2 end of the transformer chip is connected with the first end of the second inductor, the second end of the second inductor is respectively connected with the cathode of the Schottky diode, the second end of the first capacitor and the anode of the voltage input end connected to the POE device, the MCT3 end of the transformer chip is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the second end of the second capacitor and grounded, the first end of the second capacitor is connected with the second end of the first resistor, and the first end of the first resistor is connected with the MCT4 end of the transformer chip.

Preferably, the first capacitor is a ceramic capacitor.

By adopting the protection device and the protection system based on the butt joint of the Ethernet equipment with the POE function, the problem that the equipment is burnt out due to the fact that the two PSE equipment are power supply parties when the two PSE equipment are in butt joint and if the power supply voltages of the two PSE equipment are different or the polarities of the power supply voltages of the two PSE equipment are opposite is solved, and the protection device and the protection system have wide application range.

Drawings

Fig. 1 is a schematic structural diagram of a protection device and a system for ethernet device docking based on a POE function of the present invention.

Detailed Description

In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.

In a preferred embodiment, the capacitor is a ceramic capacitor.

In a preferred embodiment, the first capacitor is a ceramic capacitor.

The relevant principle of the invention is as follows:

according to the POE negotiation principle:

1) PSE detects the presence of PD

The PSE determines whether the access device has PD characteristics by detecting the impedance between the power output line pairs and the capacitance. The output voltage is detected to be 2.8V-10V, and the next step is carried out after the PD characteristic is detected.

PD characteristics: two ends of a power supply output line are 1, and the direct current impedance is 19K-26.5 Kohm; 2. a capacity value of less than 150 nF;

2) detecting power level of PD

The detection voltage is output again, the voltage value is 15.5V-20.5V, and the power grade of the PD is judged through the feedback current

3) PSE supplies power to PD equipment

The device that detects the port mount is a legitimate PD and completes the power allocation for this PD, i.e. starts powering up this side.

4) Supplying power and monitoring

The PD equipment is powered, and the current is monitored, so that the current is prevented from being overlarge.

5) Power off

Based on the above principle, in a specific embodiment, a capacitor C1 and a schottky diode D1 with a capacitance of more than 150nF are connected to the PSE power supply output line, as shown in fig. 1.

The function of the capacitor is as follows: so that the device PSE device is not recognized as a PD device, the capacitor may be a ceramic capacitor.

Function of schottky diode: the non-standard PSE equipment in the market at present does not detect whether the access equipment has the PD characteristic, but directly supplies power. Once the supplied voltage is opposite in level to the POE device supply voltage being switched in, the device will burn out. The problem is solved if a diode in the reverse direction is added. The power POE will stop supplying power to the access device due to the excessive current.

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. A protection device based on Ethernet equipment butt joint with POE function is characterized in that the device comprises a PSE equipment protection module for preventing the PSE equipment from burning out when the PSE equipment is in butt joint, the PSE equipment protection module comprises:

a capacitor for preventing the PSE device from being identified as a PD device;

the Schottky diode and the capacitor are bridged at the positive end and the negative end of the POE power supply; the positive pole of schottky diode and the one end of first inductance and the negative pole homogeneous phase of access POE equipment be connected, the negative pole of schottky diode and the one end of second inductance and the positive pole of access POE equipment be connected, the both ends of first electric capacity are connected with the positive pole of access POE equipment and negative pole respectively, first electric capacity and schottky diode all be connected with PSE power supply output line.

2. The protection device based on the butt joint of the Ethernet equipment with the POE function as claimed in claim 1, wherein the capacitor is a ceramic capacitor.

3. A protection system based on the butt joint of Ethernet equipment with POE function based on the device of claim 1, wherein the system comprises a transformer chip, a first inductor, a second inductor, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a Schottky diode, the MCT1 terminal of the transformer chip is connected with the first terminal of the first inductor, the second terminal of the first inductor is respectively connected with the anode of the Schottky diode, the first terminal of the first capacitor is connected with the cathode of the voltage input terminal connected with the POE equipment, the MCT2 terminal of the transformer chip is connected with the first terminal of the second inductor, the second terminal of the second inductor is respectively connected with the cathode of the Schottky diode, the second terminal of the first capacitor is connected with the anode of the voltage input terminal connected with the POE equipment, the MCT3 end of the transformer chip is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the second end of the second capacitor and grounded, the first end of the second capacitor is connected with the second end of the first resistor, and the first end of the first resistor is connected with the MCT4 end of the transformer chip.

4. The protection system based on Ethernet equipment with POE function docking as claimed in claim 3, wherein the first capacitor is a ceramic capacitor.