CN107294733B - Power over Ethernet isolation device - Google Patents
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- CN107294733B CN107294733B CN201710576156.8A CN201710576156A CN107294733B CN 107294733 B CN107294733 B CN 107294733B CN 201710576156 A CN201710576156 A CN 201710576156A CN 107294733 B CN107294733 B CN 107294733B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention belongs to the technical field of communication equipment, and discloses a power over Ethernet isolation device, which comprises: the power supply comprises a network transformer, a power supply anode inductance isolation structure and a power supply cathode inductance isolation structure; the power supply anode inductance isolation structure is connected between the first secondary input/output differential line pair of the network transformer; the power supply negative electrode inductance isolation structure is connected between the second secondary input/output differential line pair of the network transformer; the positive inductance isolation structure of power includes: a first inductor and a second inductor; the first inductor and the second inductor are connected in series and are connected between the first secondary input/output differential line pair; the first inductor and the second inductor are provided with a PoE power supply positive electrode interface; the power negative pole inductance isolation structure includes: a third inductor and a fourth inductor; the third inductor and the fourth inductor are connected in series and are connected between the second secondary input/output differential line pair; the third inductor and the fourth inductor are provided with a PoE power supply negative electrode interface. The invention provides a device capable of overcoming the defects that a common network transformer does not support a PoE function, and is small in load current and easy to saturate.
Description
Technical Field
The invention relates to the technical field of communication equipment, in particular to a power over Ethernet isolation device.
Background
Currently, industry standards for PoE are mainly IEEE802.3 af and IEEE802.3at, supporting a maximum PD power consumption of 25.5w. In addition, there are industries that use the more widely non-standard ltpoe++, supporting PD power consumption up to 90 w. According to IEEE802.3 af, IEEE802.3at and LTPoE++ regulations, PSE output voltage and PD input voltage are approximately 40V to 54V, and calculated according to the regulations, when PD power consumption is 25.5w, PSE power supply current is 638mA at maximum; at 90w power consumption of the PD, the PSE supply current is 2.25A maximum.
The existing common network transformer is adopted, voltage is added to the secondary center tap of the common network transformer to supply power to a load, because the inductance core of the common network transformer is thinner, 638mA current is enough to saturate the inductance and lose the effect of a transformer coupling signal, data communication cannot be carried out, and for a large-current winding of 2.25A, the inductance winding cannot bear such a large current and is blown. More importantly, even if the inductance is not saturated or the winding of the transformer is not blown by high current, the same current is induced by the high current of the secondary coil on the primary side of the transformer, so that the PHY side chip connected with the primary side of the transformer is damaged, and the purpose of protecting the PHY side chip of the network transformer cannot be achieved.
That is, since the existing PoE device needs to supply or receive power while transmitting the data signal, the common network transformer is not capable of carrying the load current, and the current is induced at the side of the transformer connected to the PHY port, which damages the PHY chip.
Disclosure of Invention
The invention provides an Ethernet power supply isolation device, which solves the technical problems that a network transformer is difficult to bear load current, current is induced on one side of the transformer connected with a PHY port, and a PHY chip is damaged in the prior art.
In order to solve the above technical problems, the present invention provides a power over ethernet isolation device, including: the power supply comprises a network transformer, a power supply negative electrode inductance isolation structure and a power supply positive electrode inductance isolation structure;
the power supply anode inductance isolation structure is connected between the first secondary input/output differential line pair of the network transformer; the power supply negative electrode inductance isolation structure is connected between the second secondary input/output differential line pair of the network transformer;
the positive inductance isolation structure of the power supply comprises: a first inductor and a second inductor; the first inductor and the second inductor are connected in series and are connected between the first secondary input/output differential line pair; the first inductor and the second inductor are provided with a PoE power supply anode interface;
the power supply negative electrode inductance isolation structure comprises: a third inductor and a fourth inductor; the third inductor and the fourth inductor are connected in series and connected between the second secondary input/output differential line pair; and the third inductor and the fourth inductor are provided with a PoE power supply negative electrode interface.
An interface based on the power over ethernet device, the interface comprising: a PoE power positive interface, a PoE power negative interface, a PHY port and an RJ45 connector;
the PoE power supply positive electrode interface is used for connecting the positive electrode of the PoE power supply;
the PoE power negative electrode interface is used for connecting the negative electrode of the PoE power; the PHY port is connected with the primary of the network transformer;
the RJ45 connector is connected with the first secondary input/output differential line pair and the second secondary input/output differential line pair respectively.
A power supply device based on the interface, the power supply device comprising: the interface and the power supply device main body;
the control chip of the power supply equipment main body is used for managing PoE power supply; the interface is respectively connected with the power supply of the power supply main body through the PoE power supply positive electrode interface and the PoE power supply negative electrode interface.
A powered device based on the interface, the powered device comprising: the interface and the powered device main body;
the control chip of the power receiving equipment main body is used for rectifying an input power supply and controlling the power of the power class configuration;
the interface is respectively connected with the power supply end of the power receiving main body through the PoE power supply anode interface and the PoE power supply cathode interface.
A power over ethernet system based on the power sourcing equipment, comprising: the power supply equipment, the Ethernet cable and the power receiving equipment;
the power supply device is connected with the power receiving device through the Ethernet line.
A power over ethernet system based on the powered device, comprising: the power receiving device, the Ethernet cable and the power supply device;
the power receiving device is connected with the power supply device through the Ethernet line.
A power over ethernet system based on the power sourcing equipment and the powered device, comprising: the power receiving device, the power supplying device, and an ethernet cable;
the power receiving device and the power supply device are connected through the Ethernet line.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
the power over ethernet isolation device provided in the embodiment of the application provides a solution to the problem that primary induced current is easy to damage a PHY chip because the load current capacity of a network transformer is limited. The current is prevented from flowing through the network transformer and the generation of primary side induced current is restrained through the network transformer, the power supply positive electrode inductance isolation structure arranged between the first secondary input/output differential line pairs and the power supply negative electrode inductance isolation structure arranged between the second secondary input/output differential line pairs, so that the problem that load current is limited by the network transformer is solved, and the damage of the PHY chip caused by the induced current can be avoided. Specifically, for the power path, the power supply is connected to the PoE power supply positive electrode interface, the direct current flows through the first inductor and the second inductor to the first secondary input/output differential line pair, and since there is no potential difference between the first secondary input/output differential line pair, no current flows through the secondary inductor of the network transformer, and the inductor is not saturated, so that the differential data signal is not affected to couple to the primary side, the primary side does not induce current, and therefore the PHY chip is not damaged, and the electrical isolation characteristic of the network transformer is maintained. The current reflowed after reaching the opposite terminal equipment through the RJ45 connector and the Ethernet cable reaches the second secondary input/output differential line pair and enters the PoE power supply negative electrode interface through the third inductor and the fourth inductor to form a complete power supply current reflow path; similarly, since the potentials of the second secondary input/output differential line pairs are equal, no potential difference exists, no current flows through the secondary inductance of the network transformer, and data communication is not affected. When the data signal reaches the junction point of the network transformer and the first inductor, the second inductor, the third inductor and the fourth inductor in terms of the data communication path, the inductor has the characteristics of direct current and alternating current resistance, and the signal directly enters the network transformer, is coupled to the primary or flows through the RJ45 connector, and does not enter the first inductor, the second inductor, the third inductor and the fourth inductor, so that the data cannot interfere with the power supply or be distorted because the data flows through the inductors to reach the power supply. That is, the data signal is transmitted along the original path. For the requirement of large-power-consumption load, the network transformer does not need to be replaced, only an inductor with proper rated current is needed to be selected, and for data communication with different rates, only an inductor with proper inductance value is needed to be selected as long as the network transformer supports the access requirement of corresponding rate, so that the purposes of passing direct current and blocking high-frequency signals are achieved.
Drawings
Fig. 1 is a schematic diagram of a power over ethernet isolation device according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a power over ethernet isolation device according to embodiment 2 of the present invention.
Detailed Description
According to the power over Ethernet isolation device, the technical problem that a network transformer is difficult to bear load current in the prior art, current is induced on one side of the transformer connected with a PHY port, and a PHY chip is damaged is solved.
In order to better understand the above technical solutions, the following detailed description will be made with reference to the accompanying drawings and specific embodiments, and it should be understood that specific features in the embodiments and examples of the present invention are detailed descriptions of the technical solutions of the present application, and not limit the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
Example 1
Referring to fig. 1, the present embodiment provides a power over ethernet isolation device for use in a PoE power over ethernet environment. Comprising the following steps: network transformer T1, power negative pole inductance isolation structure and power positive pole inductance isolation structure.
Specifically, the power supply positive electrode inductance isolation structure is connected between the first secondary input/output differential line pair LAN1 and LAN2 of the network transformer T1; the power supply negative inductance isolation structure is connected between the second secondary input/output differential line pair LAN3 and LAN6 of the network transformer T1.
The positive inductance isolation structure of the power supply comprises: a first inductor L1 and a second inductor L2; the first inductor L1 and the second inductor L2 are connected in series and connected between the first secondary input/output differential line pair LAN1 and LAN 2; the first inductor L1 and the second inductor L2 are configured to provide a PoE power source positive electrode interface VCCP.
The power supply negative electrode inductance isolation structure comprises: a third inductance L3 and a fourth inductance L4; the third inductor L3 and the fourth inductor L4 are connected in series and connected between the second secondary input/output differential line pair LAN3 and LAN 6; the third inductor L3 and the fourth inductor L4 are provided with a PoE power source cathode interface VCCN.
In the case of performing a power supply operation, a power supply source is connected from the PoE power supply positive electrode interface VCCP, a current flows through the first inductance L1 and the second inductance L2, and then flows out from the first secondary input/output differential line pair LAN1 and LAN2, and no potential difference exists between the first secondary input/output differential line pair LAN1 and LAN 2; the secondary inductor of the network transformer T1 will not have current passing through it; on the one hand, no induced current is generated on the primary side, so that burning of chips connected to it is avoided; on the other hand, the secondary inductance coil is not saturated, differential signal coupling to the primary is not affected, and the quality and reliability of data transmission are guaranteed; thereby maintaining the electrically isolated nature of the network transformer.
The current flows back through the second secondary input/output differential line pair LAN3 and LAN6, and flows into the PoE power supply negative electrode interface VCCN through the third inductor L3 and the fourth inductor L4, and then enters the power supply. During this time, since there is no potential difference between the second secondary input/output differential line pair LAN3 and LAN6, no current will still pass through the secondary inductor winding, thereby avoiding affecting data communication.
In the case of performing data communication, when the signal reaches the junction of the network transformer T1 and the first, second, third and fourth inductors L1, L2, L3 and L4, the signal directly enters the network transformer T1, couples to the primary or flows through the RJ45 connector, but does not enter the first, second, third and fourth inductors L1, L2, L3 and L4, and thus the data will not interfere with or distort the power supply by flowing through the inductors to reach the power supply. That is, the data signal is transmitted along the original path.
For the high-power-consumption load demand in practical application, the network transformer T1 does not need to be replaced, and only the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 with proper rated currents are needed to be selected.
For data communication with different rates, only the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 with proper inductance values are needed to be selected as long as the network transformer T1 supports the access requirement of the corresponding rate, so that the purposes of direct current and high frequency signal blocking are achieved.
It should be noted that, the description and implementation of the present embodiment take only fast ethernet (100 Mbit/s) and standard ethernet (10 Mbit/s) as examples, that is, only 2 pairs of conventional network wires are used, and PIN1, PIN2, PIN3 and PIN6 of the butt-joint RJ45 connector correspond to the 2 pairs of data wires from LAN1, LAN2, LAN3 and LAN6 of the network transformer to the RJ45 connector in fig. 1, respectively;
example 2
Referring to fig. 2, gigabit ethernet (1000 Mbit/s) and 10G (10 Gbit/s) ethernet may be used according to actual needs, and these can be extended and applied on this basis, which will not be described again.
Here LAN1/LAN2, LAN3/LAN6 loads VCCP, LAN4/LAN5, and LAN7/LAN8 loads VCCN. It may also be (1) LAN1/LAN2 is VCCP (or VCCN) and LAN3/LAN6 is VCCN (or VCCP) as shown in FIG. 1, LAN4/LAN5 and LAN7/LAN8 are not subjected to voltage, i.e. LAN4/LAN5 and LAN7/LAN8 may not have inductance; (2) LAN4/LAN5 is VCCP (or VCCN), LAN7/LAN8 is VCCN (or VCCP), LAN1/LAN2 and LAN3/LAN6 are not charged with voltage, i.e. LAN1/LAN2 and LAN3/LAN6 may not have inductance.
The embodiment also provides an application scheme based on the isolation device.
The embodiment provides an interface based on the power over ethernet isolation device, the interface includes: a PoE power positive interface, a PoE power negative interface, a PHY port and an RJ45 connector;
the PoE power supply positive electrode interface is used for connecting the positive electrode of the PoE power supply;
the PoE power negative electrode interface is used for connecting the negative electrode of the PoE power;
the PHY port is connected with the primary of the network transformer; for connecting chips with PHY ports.
The RJ45 connector is connected with the first secondary input/output differential line pair and the second secondary input/output differential line pair respectively; and realizing the connection of the data and the power supply structure.
In the use process, the isolation structure is connected to PSE power supply equipment and PD power supply equipment in the PoE power supply system and used for externally connecting Ethernet wires.
In the working process, current forms a loop between power supply and power receiving equipment through the inductance isolation structure without passing through a network transformer, so that the electric isolation of data communication and power supply is realized; the generation of induced current can be avoided to influence the connected chip and normal data communication.
Further, the embodiment also provides PSE power supply equipment and PD power receiving equipment of the Ethernet power supply system based on the interface.
A power supply device based on the interface, the power supply device comprising: the interface and the power supply device body.
The control chip of the power supply equipment main body is used for managing PoE power supply;
the interface is respectively connected with the power supply of the power supply main body through the PoE power supply positive electrode interface and the PoE power supply negative electrode interface.
A powered device based on the interface, the powered device comprising: the interface and the powered device main body;
the control chip of the power receiving equipment main body is used for rectifying an input power supply and controlling the power of the power class configuration;
the interface is respectively connected with the power supply end of the power receiving main body through the PoE power supply anode interface and the PoE power supply cathode interface.
The isolation operation of the power receiving and supplying devices is implemented at the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4, which are not described herein again.
The embodiment also provides a power over ethernet system based on the power supply and powered device.
A power over ethernet system based on the power sourcing equipment, comprising: the power supply equipment, the Ethernet cable and the power receiving equipment;
the power supply device is connected with the power receiving device through the Ethernet line.
A power over ethernet system based on the powered device, comprising: the power receiving device, the Ethernet cable and the power supply device;
the power receiving device is connected with the power supply device through the Ethernet line.
A power over ethernet system based on the power sourcing equipment and the powered device, comprising: the power receiving device, the power supplying device, and an ethernet cable;
the power receiving device and the power supply device are connected through the Ethernet line.
The isolation operation of the power over ethernet system is implemented at the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4, which are not described herein again. Generally, the structure can be arranged at the power receiving end, the power supply end or both ends, and can be selected according to actual needs.
PHY refers to the physical layer, the lowest layer of OSI; refers generally to a chip that interfaces with external signals; an ethernet PHY chip.
RJ45 is one type of information jack (i.e., communication terminal) connector in a wiring system, the connector consisting of a plug (header, crystal head) and a jack (module), the plug having 8 grooves and 8 contacts.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
the power over ethernet isolation device provided in the embodiment of the application provides a solution to the problem that primary induced current is easy to damage a PHY chip because the load current capacity of a network transformer is limited. The power supply anode inductance isolation structure arranged on the first secondary input/output differential line pair and the power supply cathode inductance isolation structure arranged on the second secondary input/output differential line pair avoid that current flows through the network transformer and simultaneously inhibit the generation of primary side induced current, so that the problem that load current is limited by the network transformer is avoided, and the damage of the PHY chip caused by the induced current can be avoided. Specifically, for the power path, the power supply is connected to the PoE power supply positive electrode interface, the direct current flows through the first inductor and the second inductor to the first secondary input/output differential line pair, and since there is no potential difference between the first secondary input/output differential line pair, no current flows through the secondary inductor of the network transformer, and the inductor is not saturated, so that the differential data signal is not affected to couple to the primary side, the primary side does not induce current, and therefore the PHY chip is not damaged, and the electrical isolation characteristic of the network transformer is maintained. The current reflowed after reaching the opposite terminal equipment through the RJ45 connector and the Ethernet cable reaches the second secondary input/output differential line pair and enters the PoE power supply negative electrode interface through the third inductor and the fourth inductor to form a complete power supply current reflow path; likewise, since the potentials on the second secondary input/output differential line pair are equal, there is no potential difference, and therefore no current flows through the network transformer secondary inductance, and data communication is not affected. When the data signal reaches the junction point of the network transformer and the first inductor, the second inductor, the third inductor and the fourth inductor in terms of the data communication path, the inductor has the characteristics of direct current and alternating current resistance, and the signal directly enters the network transformer, is coupled to the primary or flows through the RJ45 connector, and does not enter the first inductor, the second inductor, the third inductor and the fourth inductor, so that the data cannot interfere with the power supply or be distorted because the data flows through the inductors to reach the power supply. That is, the data signal is transmitted along the original path. For the requirement of large-power-consumption load, the network transformer does not need to be replaced, only an inductor with proper rated current is needed to be selected, and for data communication with different rates, only an inductor with proper inductance value is needed to be selected as long as the network transformer supports the access requirement of corresponding rate, so that the purposes of passing direct current and blocking high-frequency signals are achieved.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (7)
1. A power over ethernet isolation device, comprising: the power supply comprises a network transformer, a power supply anode inductance isolation structure and a power supply cathode inductance isolation structure;
the power supply anode inductance isolation structure is connected between the first secondary input/output differential line pair of the network transformer; the power supply negative electrode inductance isolation structure is connected between the second secondary input/output differential line pair of the network transformer;
the positive inductance isolation structure of the power supply comprises: a first inductor and a second inductor; the first inductor and the second inductor are connected in series and are connected between the first secondary input/output differential line pair; the first inductor and the second inductor are provided with a PoE power supply anode interface;
the power supply negative electrode inductance isolation structure comprises: a third inductor and a fourth inductor; the third inductor and the fourth inductor are connected in series and connected between the second secondary input/output differential line pair; and the third inductor and the fourth inductor are provided with a PoE power supply negative electrode interface.
2. An interface based on the power over ethernet isolation device of claim 1, the interface comprising: a PoE power positive interface, a PoE power negative interface, a PHY port and an RJ45 connector;
the PoE power supply positive electrode interface is used for connecting the positive electrode of the PoE power supply;
the PoE power negative electrode interface is used for connecting the negative electrode of the PoE power;
the PHY port is connected with the primary of the network transformer;
the RJ45 connector is connected with the first secondary input/output differential line pair and the second secondary input/output differential line pair respectively.
3. A power supply device based on the interface of claim 2, characterized in that the power supply device comprises: the interface and the power supply device main body; the control chip of the power supply equipment main body is used for managing PoE power supply;
the interface is respectively connected with the power supply of the power supply equipment main body through the PoE power supply anode interface and the PoE power supply cathode interface.
4. The powered device based on the interface of claim 2, wherein the powered device comprises: the interface and the powered device main body; the control chip of the power receiving equipment main body is used for rectifying an input power supply and controlling the power of the power class configuration;
the interface is respectively connected with the power supply end of the powered device main body through the PoE power supply anode interface and the PoE power supply cathode interface.
5. A power over ethernet system based on the power sourcing equipment of claim 3, comprising: the power supply equipment, the Ethernet cable and the power receiving equipment;
the power supply device is connected with the power receiving device through the Ethernet line.
6. A power-over-ethernet system based on the powered device of claim 4, comprising: the power receiving device, the Ethernet cable and the power supply device;
the power receiving device is connected with the power supply device through the Ethernet line.
7. A power over ethernet system, comprising: the power supply apparatus according to claim 3, the power receiving apparatus according to claim 4, and an ethernet line;
the power receiving device and the power supply device are connected through the Ethernet line.
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| CN107294733A (en) | 2017-10-24 |
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