TWI623204B - Ethernet powered device circuit and rj45 connector having the same - Google Patents

Abstract

A power receiving end circuit of an Ethernet network, comprising: a cable side, a physical side, and four channels connected between the cable side and the physical side, the first channel comprising a first terminal transmission line, a second terminal transmission line, and the first terminal The transmission line and the second terminal transmission line are connected and provided with a center tapped first transformer, and the second channel includes a third terminal transmission line, a sixth terminal transmission line, a third terminal transmission line and a sixth terminal transmission line, and is provided with a center tap second a transformer, the third channel includes a fourth terminal transmission line and a fifth terminal transmission line, and the fourth channel includes a seventh terminal transmission line and an eighth terminal transmission line, wherein the first and second terminal transmission lines are connected in parallel with the fourth and fifth terminal transmission lines to form a first A power transmission line, the third and sixth terminal transmission lines are connected in parallel with the seventh and eighth terminal transmission lines to form a second power transmission line. The RJ45 connector with the power receiving circuit of the Ethernet is also disclosed.

Description

Ethernet terminal circuit and RJ45 connector with same

The invention relates to a power receiving end circuit of an Ethernet network and an RJ45 connector therewith, in particular to a connection of power terminals in a power receiving end circuit of an Ethernet network.

Power Over Ethernet (POE) refers to some IP-based terminals (such as IP phones, WLAN access points, APs) without any changes to the existing Ethernet Cat.5 cabling infrastructure. Network cameras, etc.) can also provide DC power supply technology for such devices while transmitting data signals. There are two association standards related to POE technology, one is IEEE 802.3af published in June 2003, and the other is IEEE 802.3at published in 2009. In a Power over Ethernet (PoE) system, a device that provides power is called a Power Sourcing Equipment (PSE), and a device that uses a power source is called a Powered Device (PD). The PSE is usually an Ethernet switch, router, hub or other network switching device. The PD has various forms, such as a digital IP phone, a wireless LAN access point AP, a network camera, and the like.

The standard five types of network cables have four pairs of twisted pairs, but only two of them are used in 10M BASE-T and 100M BASE-T. IEEE802.3af and IEEE 802.3at allow two usages. The first application is idle. The power supply of the foot is that the power is supplied by the 4th, 5th, and 7th and 8th pins. When the second application data pin is powered, the DC power supply is applied to the middle of the transmission transformer, and the data transmission is not affected, that is, the 1, 2, and 3 are utilized. , 6 feet power supply. Four pairs of twisted pairs are used in 1000M (1G) BASE-T. It can also be powered by 4, 5 and 7, 8 pins, or 1, 2 and 3, 6 feet.

For the prior art related to the present invention, please refer to the TWM305929 patent published on February 1, 2007, the first to fourth figures of the accompanying drawings disclose the 10/100 MBASE-T Ethernet power receiving end circuit, the fifth figure thereof Revealed as 1000M (1G) BASE-T Ethernet power receiving circuit, if the first picture and the second picture use the data signal to the 1, 2 and 3, 6 feet for the powered device (PD) to receive power, then the power supply device When the (PSE) is set to the idle signal pair 4, 5, and 7, 8 feet, the powered device (PD) cannot be powered, and the third and fifth figures are set for the compatible power supply (PSE). 2 feet and 3, 6 feet or 4, 5 feet and 7 and 8 feet can receive power, so on the power receiving device (PD) end 1, 2 feet and 3, 6 feet and 4, 5 feet and 7, 8 feet Connect the two rectifier bridges at the same time and connect directly to the powered device (PD). However, if the setting is not only increased the number of pin terminals, but also the rectifier bridge is increased, thereby increasing the cost of the RJ45 electrical connector.

The main technical problem to be solved by the present invention is to provide a power receiving end circuit of the Ethernet network, which has a simple structure.

In order to solve the above-mentioned main technical problems, the present invention adopts the following technical means: a power receiving end circuit of the Ethernet network, which comprises a cable side, a physical side, and four channels connected between the cable side and the physical side, and the first channel includes a first terminal transmission line, a second terminal transmission line, a first transformer connected to the first terminal transmission line and the second terminal transmission line, and having a center tap, the second channel comprising a third terminal transmission line, a sixth terminal transmission line, and a third terminal transmission line a second transformer connected to the sixth terminal transmission line and having a center tap, the third channel includes a fourth terminal transmission line and a fifth terminal transmission line, and the fourth channel includes a seventh terminal transmission line and an eighth terminal transmission line, wherein the first and second The terminal transmission line is connected in parallel with the fourth and fifth terminal transmission lines to form a first power transmission line, and the third and sixth terminal transmission lines are connected in parallel with the seventh and eighth terminal transmission lines to form a second power transmission line.

The technical problem to be solved by the present invention is to provide a connector RJ45 connector of the Ethernet network, which has a simple structure and low cost.

An RJ45 connector having an Ethernet power receiving end circuit, the RJ45 connector comprising eight butt terminals, a plurality of pin terminals, and a plurality of transformers, wherein the eight mating terminals are sequentially arranged as first to eighth terminals, and the first terminal Forming a first channel, a third terminal and a sixth terminal with the second terminal Forming a second channel, the fourth terminal and the fifth terminal forming a third channel, the seventh terminal and the eighth terminal forming a fourth channel, the plurality of transformers including the first terminal and the second terminal electrically connected and having a center tap a transformer, a second transformer electrically connected to the third terminal and the sixth terminal and having a center tap, wherein the fourth terminal and the fifth terminal are electrically connected and directly electrically connected to the center tap of the first transformer, first The center tap of the transformer is electrically connected to a pin terminal as a first power terminal, and the seventh terminal and the eighth terminal are electrically connected to each other and directly connected to a center tap of the second transformer, and the center tap of the second transformer is electrically connected. To the other pin terminal as the second power terminal.

Compared with the prior art, the present invention reduces the number of pin terminals and rectifier bridges by connecting the power transmission lines drawn from the four channels in parallel, so that the structure is simple and the cost is low.

10‧‧‧ Cable side

100, 100'‧‧‧ Ethernet network receiving circuit

13, 14, 15‧‧‧ conductive through holes

200‧‧‧RJ45 connector

201‧‧‧First terminal transmission line

202‧‧‧Second terminal transmission line

203‧‧‧ third terminal transmission line

206‧‧‧ sixth terminal transmission line

204, 204'‧‧‧fourth terminal transmission line

205, 205'‧‧‧ fifth terminal transmission line

207, 207'‧‧‧ seventh terminal transmission line

208, 208'‧‧‧ eighth terminal transmission line

21, 21’‧‧ First Passage

22, 22’‧‧‧second channel

23, 23’‧‧‧ third channel

24, 24'‧‧‧ fourth channel

30‧‧‧ physical side

300‧‧‧External circuit board

301‧‧‧through hole

41, 41'‧‧‧ first transformer

42, 42' ‧ ‧ second transformer

43, 43’‧‧‧ Third Transformer

C‧‧‧fourth transformer

413, 423, 413', 423', 433', 443' ‧ ‧ center tap

51, 51'‧‧‧ first power transmission line

52, 52'‧‧‧ second power transmission line

61‧‧‧ Grounding point

62‧‧‧resistance

63‧‧‧ Capacitance

71‧‧‧First Common Mode Choke

72‧‧‧Second common mode choke

81‧‧‧ docking chamber

82‧‧‧Installation underside

83‧‧‧Positioning column

J1‧‧‧ first terminal

J2‧‧‧second terminal

J3‧‧‧ third terminal

J4‧‧‧fourth terminal

J5‧‧‧ fifth terminal

J6‧‧‧ sixth terminal

J7‧‧‧ seventh terminal

J8‧‧‧ eighth terminal

P13‧‧‧First power terminal

P14‧‧‧second power terminal

The first figure is a circuit diagram of a first embodiment of the power receiving circuit of the Ethernet of the present invention.

The second figure is a circuit diagram of a second embodiment of the power receiving circuit of the Ethernet of the present invention.

The third figure is a perspective view of the RJ45 connector of the power receiving end of the Ethernet of the present invention.

The fourth figure is a front view of the RJ45 connector of the Ethernet terminal shown in the third figure.

The fifth figure is a side view of the RJ45 connector of the power receiving end of the Ethernet shown in the third figure.

The sixth diagram is a schematic diagram of the external circuit board used for the RJ45 connector pin installation shown in Figure 3.

Please refer to the first figure, which is a first embodiment of the present invention, which can be used for a 10/100 MBASE-T Ethernet network.

An Ethernet power receiving end circuit 100 includes a cable side 10, a physical side 30, and four channels connected between the cable side 10 and the physical side 30. The four channels correspond to eight terminals of the RJ45 connector. The four channels include a first channel 21 and a third channel 23 which are signal transmission channels, and a second channel 22 and a fourth channel 24 which are idle channels, and the first channel 21 and the third channel 23 can be used to transmit a pair of differentials, respectively. The signal is right.

The first channel 21 includes a first terminal transmission line 201, a second terminal transmission line 202, a first terminal transmission line 201 and a second terminal transmission line 202, and is provided with a first voltage change of the center tap 413. 41. The second passage 22 includes a third terminal transmission line 203, a sixth terminal transmission line 206, a second transformer 42 connected to the third terminal transmission line 203 and the sixth terminal transmission line 206 and provided with a center tap 423. The third channel 23 includes a fourth terminal transmission line 204 and a fifth terminal transmission line 205, and the fourth channel 24 includes a seventh terminal transmission line 207 and an eighth terminal transmission line 208.

The fourth terminal transmission line 204 and the fifth terminal transmission line 205 are connected in parallel and directly connected to the center tap 413 of the first transformer 41 as the first power transmission line 51. The seventh terminal transmission line 207 and the eighth terminal transmission line 208 are connected in parallel with the second transformer 42. The center tap 423 is directly connected as the second power transmission line 52.

The first power transmission line 51 and the second power transmission line 52 can serve as a positive input terminal and a negative input terminal of the power receiving device. The Ethernet power receiving end circuit 100 further includes a grounding point 61 and a resistor 62 and a capacitor 63 connected between the first and second power transmission lines 51 and 52 and the grounding point 61. The resistor 62 and the capacitor 63 can be used as a Bob Smith circuit ( Bob-Smith) to achieve impedance matching. The Ethernet power receiving end circuit 100 further includes a first common mode choke coil 71 and a second common mode choke coil 72 electrically connected to the first and second transformers 41 and 42 respectively, and the first and second transformers 41. 42 includes a primary coil connected to the cable side 10 and a secondary coil connected to the first and second common mode chokes 71, 72, wherein the two ends of the primary coil are respectively connected to the first and second terminal transmission lines 201, 202 or third and sixth terminal transmission lines 203, 206 are connected. In the first figure, the first and second transformers 41 and 42 are isolation transformers, and of course, they can be replaced with autotransformers. In the first figure, the first and second common mode chokes 71, 72 are three-wire common mode chokes, and of course can be replaced by two-wire common mode chokes. In addition, the positions of the first and second transformers 41, 42 and the first and second common mode chokes 71, 72 in the first figure may be interchanged.

Referring to the second figure, a second embodiment of the present invention can be used for a 1000M (1G) BASE-T Ethernet network. The main difference from the first embodiment is that four channels are used for transmitting network signals, and the Ethernet receiving circuit 100' not only uses the first channel 21' and the second channel 22' as signal transmission channels, but the third channel 23' And the fourth channel 24' also serves as a signal transmission channel. The third channel 23' includes a third transformer 43' connected to the fourth terminal transmission line 204' and the fifth terminal transmission line 205' and provided with a center tap 433', the fourth channel 24' including the seventh terminal transmission line 207' and the The eight-terminal transmission line 208' is connected and provided with a fourth transformer 44' of the center tap 443'. The center tap 433' of the third transformer 43' is directly connected to the center tap 413' of the first transformer 41' as the first power transmission line 51. ', the center tap 443' of the fourth transformer 44' is directly connected to the center tap 423' of the second transformer 42' and then transmitted as the second power source. Line 52'. According to the embodiments 1 and 2 of the present invention, since the power transmission lines drawn out from the four channels are connected in parallel, the number of the pin terminals and the rectifier bridge is reduced, so that the structure is simple and the cost is low.

Referring to the third to sixth figures, an RJ45 connector 200 has the Ethernet terminal receiving circuit of the first figure. The Ethernet receiving terminal RJ45 connector 200 includes eight docking terminals J, a plurality of pin terminals P, and a plurality of transformers (not shown). The eight docking terminals J are sequentially arranged as the first terminal to the eighth terminal. Referring to the first, second and third figures, the first terminal J1 and the second terminal J2 form a first channel, and the third terminal J3 and The sixth terminal J6 forms a second channel, the fourth terminal J4 and the fifth terminal J5 form a third channel, and the seventh terminal J7 and the eighth terminal J8 form a fourth channel, and the complex transformer includes a first terminal J1 and a second terminal J2 The first transformer electrically connected and provided with a center tap is electrically connected to the third terminal J3 and the sixth terminal J6 and is provided with a second tap of the center tap. After the fourth terminal J4 and the fifth terminal J5 are electrically connected, The center tap of the first transformer is directly electrically connected, and the center tap of the first transformer is electrically connected to a pin terminal as the first power terminal P13, and the seventh terminal J7 and the eighth terminal J8 are electrically connected to the second transformer. The center tap is directly electrically connected, and the center tap of the second transformer is electrically connected to the other pin terminal as the second power terminal P14.

The eight docking terminals J are for connection with eight wires in the cable plug connector for mounting to the circuit board 300 of the physical side (power receiving device PD). The first power terminal P13 and the second power terminal P14 are respectively inserted into the conductive vias 13, 14 of the external circuit board 300, and the other pin terminals are inserted into the conductive vias 15 of the external circuit board. The first power supply terminal P13 and the second power supply terminal P14 can serve as a positive electrode and a negative electrode of the power receiving device.

The power receiving end RJ45 connector 200 includes an insulative housing 8 having a mating cavity 81 and a mounting bottom surface 82. The eight mating terminals J extend obliquely in the mating cavity 81, and the plurality of pin terminals P extend downward beyond the mounting bottom surface 82. The insulative housing 8 further has a positioning post 83 protruding downward from the mounting bottom surface 82 for mounting into the through hole 301 of the external circuit board 300. The first power terminal P13 and the second power terminal P14 are located at the positioning post 83 and other pins. Between the terminals. The first transformer and the second transformer are housed in the insulative housing 8, which can reduce the space occupied by the external circuit board on the power receiving end (PD). The external circuit board 300 is a circuit board on a power receiving device (PD).

Similarly, if the RJ45 connector 200 has the Ethernet receiving circuit shown in the second figure, it includes a four-transformer and a quad-common mode suppressor, and four channels are used to transmit the differential signal pair. The invention reduces the number of the pin terminals and the rectifier bridge by connecting the power transmission lines which are led out in the four channels in parallel, so that the structure is simple and the cost is low.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It is covered by the following patent application.

Claims (10)

An Ethernet power receiving end circuit includes: a cable side, a physical side, and four channels connected between the cable side and the physical side, the four channels including: a first channel, including a first terminal transmission line, a two-terminal transmission line, a first transformer connected to the first terminal transmission line and the second terminal transmission line and provided with a center tap; a second channel including a third terminal transmission line, a sixth terminal transmission line, and a third terminal transmission line and a sixth terminal a transmission line connected and having a center tapped second transformer; a third channel including a fourth terminal transmission line and a fifth terminal transmission line; and a fourth channel including a seventh terminal transmission line and an eighth terminal transmission line; wherein the first terminal transmission line The second terminal transmission line is connected to the fourth terminal transmission line and the fifth terminal transmission line in parallel to form a first power transmission line. The third terminal transmission line, the sixth terminal transmission line, the seventh terminal transmission line, and the eighth terminal transmission line are connected in parallel to form a second power transmission line. The Ethernet end receiving circuit of claim 1, wherein the third channel comprises a third transformer connected to the fourth terminal transmission line and the fifth terminal transmission line and having a center tap; the fourth channel includes and the seventh The terminal transmission line is connected with the eighth terminal transmission line and is provided with a fourth transformer of the center tap; the center tap of the third transformer is directly connected with the center tap of the first transformer as a first power transmission line, and the center tap of the fourth transformer and the second transformer The center tap is directly connected to serve as a second power transmission line. For example, in the Ethernet terminal receiving circuit of claim 1, wherein the fourth terminal transmission line and the fifth terminal transmission line are connected in parallel and directly connected to the center tap of the first transformer as the first power transmission line, the seventh terminal transmission line and the first After the eight terminal transmission lines are connected in parallel, they are directly connected to the center tap of the second transformer as the second power transmission line. The power receiving end circuit of the Ethernet according to claim 1, wherein the first power transmission line and the second power transmission line respectively serve as a positive pole and a negative pole of the power receiving apparatus. The Ethernet end receiving circuit of claim 1, wherein the Ethernet receiving circuit further comprises a grounding point and a resistance and a capacitance connected between the first power transmission line and the second power transmission line and the grounding point. . An RJ45 connector having an Ethernet power receiving end circuit comprising eight butt terminals, a plurality of pin terminals, and a plurality of transformers, wherein the eight mating terminals are sequentially arranged from the first terminal to the eighth terminal; the first terminal and the first terminal The two terminals form a first channel, and the plurality of transformers comprise a first transformer electrically connected to the first terminal and the second terminal and provided with a center tap; the third terminal and the sixth terminal form a second channel, and the plurality of transformers comprise a third terminal a second transformer electrically connected to the sixth terminal and having a center tap; the fourth terminal and the fifth terminal form a third channel; the seventh terminal and the eighth terminal form a fourth channel; wherein the fourth terminal and the fifth terminal are electrically After the connection, the center tap of the first transformer is directly electrically connected, and the center tap of the first transformer is electrically connected to a pin terminal as the first power terminal; the seventh terminal and the eighth terminal are electrically connected and the second transformer The center tap is directly electrically connected, and the center tap of the second transformer is electrically connected to the other pin terminal as the second power terminal. The RJ45 connector of claim 6, wherein the plurality of transformers comprise a third transformer electrically connected to the fourth terminal and the fifth terminal and having a center tap, electrically connected to the seventh terminal and the eighth terminal And a fourth transformer with a center tap; the center tap of the first transformer is connected in parallel with the center tap of the third transformer, and is electrically connected to the first power source The terminal, the center tap of the second transformer and the center tap of the fourth transformer are connected in parallel and electrically connected to the second power terminal. The RJ45 connector of claim 6, wherein the eight docking terminals are electrically connected to eight wires in the network cable plug connector, and the plurality of pin terminals are used for mounting to the circuit board of the power receiving device. . The RJ45 connector of claim 6, wherein the RJ45 connector comprises an insulative housing having a docking cavity and a mounting bottom surface, the eight mating terminals extending obliquely in the docking cavity, and the plurality of pin terminals extending downwardly beyond The bottom surface is mounted, and the insulating body further has a positioning post protruding downward from the mounting bottom surface for mounting into the through hole of the external circuit board, the first power terminal and the second power terminal being located between the positioning post and the other pin terminals. The RJ45 connector of claim 9, wherein the first transformer and the second transformer are housed and insulated within the body.