Preface
PoE is the English abbreviation of Power over Ethernet, which transmits power and data through twisted pair cables in network cables. The PoE solution simplifies the power supply and wiring of the device, no longer requires a separate adapter and no longer needs a 220V power supply, simplifies the installation of the device, and is widely adopted by cameras and APs.
The charging head network summarizes the six PoE power supplies of six brands that have been disassembled, although they look different in appearance, but they are essentially connected network cables and network transmission. Let's take a look at the different understandings of PoE by different brands, as well as the differences in products.
Apple
Apple iMac 24 inch original adapter
As the original adapter for iMac, it has a classic square design, but compared to the MacBook charger, it is not only functional to power power, it also comes with a special output cable, so that the product can both power and connect to the Internet. At the same time, the input power cable is detachable, and the cable of different lengths can be replaced, which is convenient to use.
Through the dismantling of the charging head network, it was found that the power cord inside this power supply is fixed with screws and binding posts, simplifying the assembly process, and it is also designed to adapt to a variety of colors. In addition, the power supply adopts NXP's TEA19162+TEA19161T+TEA2095 full set of APFC solutions, PFC boost switches, LLC half-bridge switches, protocol chips from Infineon, and synchronous rectifiers from onsemi.
In addition, Japanese ruby electrolytic capacitors and Panasonic SEPF series conductive polymer capacitors are used for input and output filtering, and the overall planning and workmanship of the power supply are also very particular, and the overall level is quite high.
Related Reading:
1. Disassembly report: Apple 24-inch iMac adapter magnetic cable
CISCO思科
Cisco RJ45 to USB-C Power Adapter
Cisco's USB-C power adapter features a USB-C port, an RJ45 network port, and fixed US-spec pins. The power adapter supports a wide range of voltage inputs, and the USB-C interface supports 5V3A, 9V2A and 12V1.5A outputs. The adapter provides both power and network connectivity to the conference phone by connecting the USB-C cable to the Cisco 8832 conference phone.
Through the dismantling of the charging head network, it is learned that Cisco's USB-C power adapter is composed of two PCBs, which are divided into a power adapter module and a network connection module, which are connected by wires in the middle. Among them, the power adapter module adopts the PI SC1224K main control chip, with the WT6632 protocol chip, and the network conversion chip adopts Microchip Technology LAN7800. The power adapter module is pasted with a thermal pad to strengthen heat dissipation, and the internal workmanship materials are reliable.
Related Reading:
1. Teardown report: Cisco 18W RJ45 to USB-C power adapter
H3C H3C
H3C Magic wireless storage router special power adapter
H3C H3C This power adapter is dedicated to Magic M2 wireless cloud disk, this adapter changes the traditional design with its own output cable, and combines the power output with the network cable socket. It is connected to the device through the Magic connector for power supply and provides a wired network connection to make the body more neat and beautiful.
Through dismantling, the charging head network learned that this adapter adopts a flyback switching power supply design, the primary switch tube is CS2N60FA9H by China Resources, and is equipped with a heat sink, and the output is rectified by Schottky diode. The internal input and output electrolytic capacitors are all from Manyu, and the output filter inductor is also equipped. The components are glued and fixed, and the overall workmanship and materials are good.
Related Reading:
1. Dismantling report: H3C Magic wireless storage router special power adapter
Huntkey航嘉
Huntkey 15W broadband data adapter
The POE power supply launched by Huntkey is an integrated design, which can be used by connecting the AC power cable and the network cable interface. The two interfaces of the power supply are distinguished by stickers, marked with POE power supply interfaces, and with power supply and connection indicators, which is convenient to understand the working status of the equipment. The output of the POE injector is 54V 0.28A, and the output power is 15W, which can meet the application of small power equipment.
Through dismantling, the charging head network learned that Huntkey's POE power supply has a built-in flyback switching power supply, using Jilin Huawei MOS tube, the output is rectified by Schottky diode, the primary filter capacitor is from Aihua, the output filter capacitor is from Guimigong and Ruby, the internal components are glued and fixed in a large area, and the internal workmanship materials are solid.
Related Reading:
1. Dismantling report: Huntkey 15W broadband data adapter
Tenda
Tengda Gigabit AT standard Ethernet PoE injector
This Gigabit Ethernet PoE injector is designed in a white strip enclosure with an AC power outlet at one end and two network cable ports at the other end. By using this power supply, it is possible to convert network cables that do not support PoE power supply to PoE power supply output. The output power of this power supply is 53.5V 0.6A, the power supply standard is IEEE 802.3 AT, and it supports power supply to devices below 30W, and supports gigabit speeds.
Through the dismantling of the charging head network, it is learned that this power supply has a built-in flyback switching power supply and a fixed voltage output. The primary switch is from Jilin Huawei and is rectified with a fast recovery diode. The PoE power supply control chip adopts Marui Core MK3614, which is a single-chip solution with integrated switch and current detection resistor, and comprehensive protection functions, greatly simplifying the internal design of PoE power supply.
Related Reading:
1. Dismantling report: Tenda Gigabit AT standard Ethernet PoE injector
TP-LINK
Pulian standard PoE injector
The TP-LINK standard PoE injector consists of an adapter and a power injector, and the body is designed with a straight board shape, and the black glossy surface of the shell looks very temperamental. The injector is equipped with DC power supply interface, indicator light, and input and output Gigabit Ethernet ports, which support 30W PoE device connection, and can be connected to cameras and APs that support PoE power supply.
Through the dismantling of the charging head network, it was found that the internal structure of the power supply was actually relatively simple. It mainly uses the TPS23861 Power-over-Ethernet PSE controller of the well-known manufacturer Texas Instruments, which is a chip that supports four-port PoE power supply control, and this power supply only has one output interface, which can be said to be overkill. However, from another point of view, it supports Gigabit Ethernet input and output, 30W power supply, and is a high-performance, convenient product.
Related Reading:
1. Dismantling report: TP-LINK Pulian standard PoE injector TL-POE170S
Summary of the charging head network
Through disassembly and summary, it is found that PoE power supply equipment can be basically divided into two categories, one of which is general-purpose, which supports power supply for different brands of equipment to meet the power supply of cameras and APs. There is also a tailor-made for your own equipment, which also uses PoE characteristics to simplify the cable and make it more beautiful and concise.
General-purpose PoE devices use the industry-standard 53.5V supply voltage, while dedicated power delivery devices, regardless of versatility, use a lower supply voltage and use other interfaces for data transmission. Although there are many forms of connecting devices, not limited to network cables, the essence of connecting network cables for data transmission remains the same.