hqst LAN Transformer in PoE, PoE+, UPoE+

hqst LAN Transformer in PoE, PoE+, UPoE+

PoE is fully known as Power Over Ethernet, which refers to the power supply over Ethernet copper cables such as 10BASE-T, 100BASE-TX, 

1000BASE-T, 2.5GBASE-T and 10GBASE-T, and the distance of its reliable power supply is up to 100 metres. In this way, it can effectively solve 

the centralised power supply for terminals such as IP phones, WLAN APs, portable device chargers, swipe card machines, cameras, data collection, etc.

First, the following are specific about the specific performance parameters of UPoE+, PoE+ and PoE respectively

UPoE+:

Standard:IEEE802.3bt

Power Distance: 100m

Classification: 0~4

Maximum Current: 960mA

PSE Output Voltage: 50~57V DC

PSE Output Power: <=90W

PD Input Voltage: 42.5~57V DC

PD Input Power: 81.6W

Cable requirement: CAT-5 or better

Number of power supply cable pairs: 4

PoE+:

Standard:IEEE802.3at

Power Distance: 100m

Classification: 0~4

Maximum Current: 720mA

PSE Output Voltage: 50~57V DC

PSE Output Power: <=30W

PD Input Voltage: 42.5~57V DC

PD input power: 25.5W

Cable requirement: CAT-5 or better

Power supply cable pairs: 2

Main applications: Video VoIP (10-20W), PTZ video surveillance system (20W), WinMAX, 802.11n receivers (8-45W), computers (30W+), etc.

PoE:

Standard:IEEE802.3af

Power Distance: 100m

Classification: 0~3

Maximum Current: 350mA

PSE Output Voltage: 44~57V DC

PSE Output Power: <=15.4W

PD Input Voltage: 36~57V DC

PD Input Power: 12.95W

Cable Requirements: Unstructured

Power supply cable pairs: 2

Main applications: VoIP (3-7W), WLAN access point (8-12W), etc.

Second, the POE device DC transmission mode
 

The PoE power supply system contains two devices PSE and PD.

The PoE standard defines two methods for delivering DC power to PoE-compatible devices using Ethernet transmission cables: Midspan, the middle span method, and Endpoint, the end span method.
 

Midspan method ( Midspan ):

 

The PoE function is outside the switch and is applied between a normal switch and a network terminal device, which can supply power to 

the network terminal device through the network cable.Midspan PSE (Mid Span Power Supply Equipment) is a specialised power management 

device, usually placed together with the switch. It has two RJ45 jacks corresponding to each port, one connects to the switch with a short cable 

and the other connects to the remote device.

Endpoint jumper method:

 The PoE function is integrated into the switch, thus eliminating the need to set up dedicated cables and equipment for separate transmission.

Below is a description of several endpoint jumper methods Endpoint method of power supply.


 

Third, the network transformer as the most ideal device for DC must be considered

 

lan transformer in the PHY chip and Cable between the electrical isolation, impedance matching and signal coupling and other

 functions, then in the PoE, PoE +, UPoE lines, due to the addition of the current, the Lan Transformer in the process of the 

current injection plays a key role in the process, and thus has become the two between the zui ideal device. At the same time, due to the 

current through the transformer, so the network transformer must consider the coil heating and core saturation problems, its through-current

 capacity and the ability to withstand DC bias current to meet the IEEE802.3af (PoE), IEEE802.3at (PoE+), IEEE802.3bt (UPoE) standards.