CN111901012A - Ethernet communication module and electronic system for simultaneously transmitting two signals - Google Patents
Ethernet communication module and electronic system for simultaneously transmitting two signals Download PDFInfo
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- CN111901012A CN111901012A CN202010717106.9A CN202010717106A CN111901012A CN 111901012 A CN111901012 A CN 111901012A CN 202010717106 A CN202010717106 A CN 202010717106A CN 111901012 A CN111901012 A CN 111901012A
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Abstract
The invention relates to an Ethernet communication module and an electronic system for simultaneously transmitting two signals, wherein the Ethernet communication module comprises a network transformer and a network port, the network transformer is provided with N pairs of channels, and each pair of channels is used for transmitting a pair of differential signals; the input end of each pair of channels is used for receiving a pair of differential signals, the output end of each pair of channels is connected with the network port, and the differential signals are output to the twisted pair through the network port; each pair of channels is provided with a transformer with a middle tap, and the primary side of the transformer receives differential signals transmitted by the input end; the two ends of the secondary side of the transformer form the output ends of the channels; the middle tap of the secondary side of the transformer is grounded through a middle tap capacitor and a common mode resistor which are connected in series; and the intermediate tap on the secondary side of the transformer receives the single-ended signal to be transmitted and transmits the single-ended signal to the twisted pair through the output end of the channel and the network port. Two signals can be transmitted simultaneously-standard ethernet signals and other types of signals.
Description
Technical Field
The invention relates to the field of intelligent street lamps, in particular to an Ethernet communication module and an electronic system for simultaneously transmitting two signals.
Background
IEEE 802.3 defines the physical media types of Ethernet, such as 10M Base-T, 100M Base-T, 1000MBase-T, 10G Base-T, etc., with copper twisted pair as the transmission medium and ports connected using standard RJ45 connectors. The data transmission of the Ethernet is realized by transmitting differential signals through a twisted pair. Through the ethernet, not only can transmit standard ethernet signal, but also can be used to transmit other signals, such as audio and video signals, control signals, and the like.
In some application scenarios, for example, when the foreground and background devices are connected by using a network cable, the main data may be transmitted by using a standard ethernet signal, and the main data needs to be transmitted continuously, stably and uninterruptedly, that is, the transmission of the standard ethernet signal cannot be interrupted. Meanwhile, in addition to the main data, other types of data such as status data, feedback signals, control signals, and the like may be transmitted between the foreground and background devices according to actual needs.
However, data transmission of the existing ethernet is performed based on differential signals, and either standard ethernet signals or other signals are transmitted at the same time, and the two signals cannot be transmitted simultaneously. Existing solutions typically add a transmission cable for transmitting these other types of data. But adds cost and increases the difficulty of routing.
Disclosure of Invention
Therefore, it is necessary to provide an ethernet communication module and an electronic system for simultaneously transmitting two signals, aiming at the problem that the existing ethernet scheme cannot simultaneously transmit standard ethernet signals and other types of signals at the same time.
An embodiment of the present invention provides an ethernet communication module for simultaneously transmitting two signals, including a network transformer and a network port, where the network transformer has N pairs of channels, and N is a positive integer; each pair of channels is used for transmitting a pair of differential signals;
each pair of channels comprises an input end and an output end, wherein the input end is used for receiving a pair of differential signals, the output ends of the channels are connected with the network port, and the output ends of the channels output the differential signals to the twisted pair through the network port;
each pair of channels is provided with a transformer with a center tap, and the primary side of the transformer receives differential signals transmitted by the input ends of the channels; the two ends of the secondary side of the transformer form the output ends of the channels;
the middle tap of the secondary side of the transformer is grounded through a middle tap capacitor and a common mode resistor which are connected in series; and the intermediate tap at the secondary side of the transformer receives a single-ended signal to be transmitted, and transmits the single-ended signal to a twisted pair through the output end of the channel and the network port.
In some embodiments, each pair of channels includes a common-mode inductor, a transformer, a common-mode capacitor, and a common-mode resistor, and an input terminal of the common-mode inductor is used as an input terminal of the channel for receiving a pair of differential signals; the output end of the common mode inductor is connected with the primary side of the transformer; the middle tap of the primary side of the transformer is connected with a power supply; two ends of the secondary side of the transformer are used as output ends of the channel and are connected with the network port; the middle tap of the secondary side of the transformer is grounded through the middle tap capacitor and the common-mode resistor which are connected in series; and the middle tap of the secondary side of the transformer is also used for receiving a single-ended signal to be transmitted.
In some embodiments, each pair of channels further comprises a first filter capacitor through which the power supply is grounded.
In some embodiments, each pair of channels further comprises a first resistor, a second resistor, a first capacitor, one pole of the input terminal of the common mode inductor is grounded through the first resistor and the first capacitor; and the other pole of the input end of the common mode inductor is grounded through the second resistor and the first capacitor.
In some embodiments, the intermediate tap on the secondary side of the transformer receives a single-ended signal to be transmitted by using a capacitive coupling or a transformer coupling.
In some embodiments, the power supply further comprises an anti-surge diode, a first current limiting resistor and a second current limiting resistor, wherein the first current limiting resistor and the second current limiting resistor are connected in series between a middle tap on the secondary side of the transformer and a single-ended signal to be transmitted, a connection part of the first current limiting resistor and the second current limiting resistor is connected with a cathode of the anti-surge diode, and an anode of the anti-surge diode is grounded.
In some embodiments, the network transformer further comprises a physical layer chip, wherein the physical layer chip is connected with the input end of the network transformer and used for sending and receiving differential signals.
In some embodiments, the system further comprises a data transmission indicator light and a status indicator light, which are respectively used for indicating whether the ethernet communication module has data in a transmission and connection status.
In some embodiments, the network port is an RJ45 port, and the network port and the network transformer are integrated together as an RJ45 connector with a network transformer.
Another embodiment of the present application further provides an electronic system, including a first electronic device and a second electronic device, where the first electronic device is provided with a first ethernet communication module, the second electronic device is provided with a second ethernet communication module, the first ethernet communication module is connected to the second ethernet communication module through a network cable, and the first ethernet communication module and the second ethernet communication module are the ethernet communication modules according to any one of the foregoing embodiments.
In the prior art, the center tap of the secondary side of the transformer in the network transformer is connected with a power supply or ground, so that signals can be transmitted only by using differential signals. In the ethernet communication module provided by the embodiment of the present invention, the center tap of the secondary side of the transformer in the network transformer is no longer connected to the power supply or the ground, but receives the single-ended signal, and converts the single-ended signal into the common-mode signal by using the center tap capacitor and the common-mode resistor connected in series with the center tap and the ground, so that the single-ended signal is connected to the twisted pair through the network port and transmitted to the outside; meanwhile, the network transformer can still normally transmit differential signals. Therefore, two signals can be transmitted simultaneously, namely the differential signal corresponds to the standard Ethernet signal, and the single-ended signal corresponds to other types of signals, such as a state signal, a control signal and the like. When the network cable is used for connecting the foreground and background equipment, only one network cable is needed, and the standard Ethernet signals and other types of signals can be transmitted at the same time, so that the cost is saved, and the wiring difficulty is reduced.
Drawings
Fig. 1 is a schematic diagram of a frame structure of an ethernet communication module according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a channel of an ethernet communication module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection of the Ethernet communication module peripheral circuit according to another embodiment of the invention;
fig. 4 is a schematic diagram of an internal circuit structure of an ethernet communication module according to another embodiment of the present invention;
FIG. 5 is a block diagram of an electronic system according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of an electronic system according to another embodiment of the invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides an ethernet communication module 10 for simultaneously transmitting two signals, including a network transformer 100 and a network port 200, where the network transformer 100 has N pairs of channels 110, where N is a positive integer; each pair of channels 110 is used to transmit a pair of differential signals;
each pair of channels 110 includes an input end for receiving a pair of differential signals and an output end connected to the network port 200, and the output end outputs a pair of differential signals to the twisted pair through the network port 200;
each pair of channels 110 is provided with a transformer 111 with a center tap, and the primary side of the transformer 111 receives the differential signal transmitted by the input end; the two ends of the secondary side of the transformer 111 form the output end of the channel 110;
the middle tap CT on the secondary side of the transformer 111 is grounded through a middle tap capacitor C0 and a common mode resistor RX1 which are connected in series; the middle tap CT on the secondary side of the transformer 111 receives the single-ended signal data to be transmitted, and transmits the single-ended signal to the twisted pair through the output terminal and the network port 200.
In the prior art, the center tap of the secondary side of the transformer in the network transformer is connected with a power supply or ground, so that signals can be transmitted only by using differential signals. In the ethernet communication module provided by the embodiment of the present invention, the center tap of the secondary side of the transformer in the network transformer is no longer connected to the power supply or the ground, but receives the single-ended signal, and converts the single-ended signal into the common-mode signal by using the center tap capacitor and the common-mode resistor connected in series with the center tap and the ground, so that the single-ended signal is connected to the twisted pair through the network port and transmitted to the outside; meanwhile, the network transformer can still normally transmit differential signals. Therefore, two signals can be transmitted simultaneously, namely the differential signal corresponds to the standard Ethernet signal, and the single-ended signal corresponds to other types of signals, such as a state signal, a control signal and the like. When the network cable is used for connecting the foreground and background equipment, only one network cable is needed, and the standard Ethernet signals and other types of signals can be transmitted at the same time, so that the cost is saved, and the wiring difficulty is reduced.
The network port 200 may be an RJ45 port, or other network port to which twisted pair wires may be connected. For simplicity of description, the RJ45 port is used as an example to explain the scheme.
As shown in fig. 2, each pair of channels 110 may specifically include a common-mode inductor CMC1, a transformer T1, a common-mode capacitor C0, and a common-mode resistor RX1, an input terminal of the common-mode inductor CMC1 is used as an input terminal of the channel 110, and receives a pair of differential signals, and an output terminal of the common-mode inductor CMC1 is connected to a primary side of the transformer T1; the middle tap of the primary side of the transformer T1 is connected with a power supply VCC; two ends of the secondary side of the transformer T1, which are output ends of the channel 110, are connected to the network port 200; the middle tap CT of the secondary side of the transformer T1 is grounded through a middle tap capacitor C0 and a common mode resistor RX1 which are connected in series; the center tap CT on the secondary side of the transformer T1 is also used to receive a single-ended signal data to be transmitted. By arranging the common-mode inductor, common-mode signals can be effectively inhibited, and interference of the common-mode noise signals at the input end on the transmission of subsequent differential signals is avoided.
For example, the center-tap capacitor C0 may be a high-voltage capacitor, such as a capacitor with a voltage resistance of 2000V and a capacitance of 1000 pF. The common mode resistor RX1 may be a 75 ohm resistor.
Further, each pair of channels 110 may further include a first filtering capacitor CX1, and the power source VCC is grounded through the first filtering capacitor CX1 to stabilize the voltage output of the power source VCC. As an example, the first filtering capacitance CX1 may be a capacitance of 0.1 uF.
Further, each pair of channels 110 may further include a second common-mode capacitance CX2, and the second common-mode capacitance CX2 is serially disposed between the center-tap CT on the secondary side of the transformer T1 and the common-mode resistance RX 1. As an example, the second common mode capacitance CX2 may be selected to be a capacitance of 22 nF.
In order to improve the transmission quality of the differential signal, as shown in fig. 2, each pair of channels 110 may further include a first resistor R1, a second resistor R2, a first capacitor C1, one of the input terminals of the common mode inductor CMC1, and a ground connected to the first resistor R1 and the first capacitor C1; the other pole of the input terminal of the common mode inductor CMC1 is grounded through the second resistor R2 and the first capacitor C1. Therefore, the differential mode signal and the common mode signal can be matched with the differential signal input into the channel, and the stability of the differential signal is improved.
The middle tap CT on the secondary side of the transformer T1 may be directly connected to the single-ended signal data to be transmitted, or may receive the single-ended signal data to be transmitted in a capacitive coupling or transformer coupling manner.
The ethernet communication module 10 has N channels 110, N being a positive integer. The following specifically describes the scheme of the present application with N being 4 as an example. It is understood that any number of channels 110 may be provided by the ethernet communication module 10, depending on the actual needs.
In the ethernet communication module 10, the network transformer 100 and the network port 200 may be separate modules or may be integrated modules.
In some embodiments, the network transformer 100 and the network port 200 may be integrated together to form an RJ45 connector of the integrated network transformer. Fig. 3 shows the peripheral connection circuitry of the RJ45 connector of the integrated network transformer, and fig. 4 shows the internal electrical configuration of the RJ45 connector of the integrated network transformer. As shown in fig. 3 and 4, the RJ45 connector of the integrated network transformer is provided with 4 pairs of channels — TD1, TD2, TD3 and TD4, the input end of each pair of channels has two poles (TD1-, TD1+, TD2-, TD2+, TD3-, TD3+, TD 4-TD 4+), VC1 and VC2 are middle taps of the secondary side of the transformer, and the middle tap VC1 of the secondary side of the transformer is connected with single-ended signal data to be transmitted.
The ethernet communication module 10 may further include a surge protection diode D0, a first current limiting resistor R6 and a second current limiting resistor R7, the first current limiting resistor R6 and the second current limiting resistor R7 are connected in series between the center tap VC1 on the secondary side of the transformer and the single-ended signal data to be transmitted, the junction of the first current limiting resistor R6 and the second current limiting resistor R7 is connected to the cathode of the surge protection diode D0, and the anode of the surge protection diode D0 is grounded. The anti-surge diode D0 may be a TVS tube or a zener diode, and is used to suppress the transient surge voltage and protect the entire ethernet communication module 10 from the surge voltage. By arranging the current-limiting resistor, the current at the middle tap VC1 on the secondary side of the transformer can be limited, and the circuit can be prevented from being burnt out due to excessive current.
In some embodiments, as shown in fig. 2, the ethernet communication module 10 may further include a physical layer chip (PHY)500, and the PHY chip 500 is connected to the input terminal of the network transformer 100 for transmitting and receiving differential signals. The physical layer chip 500 may have multiple pairs of ports for differential signals to correspond to the multiple pairs of channels 110 of the network transformer 100.
As shown in fig. 3, the ethernet communication module 10 may further include a data transmission indicator light D1 and a status indicator light D2 for indicating whether the ethernet communication module 10 is in a transmission and connection status, respectively.
According to the Ethernet communication module provided by the embodiment of the invention, the middle tap of the secondary side of the transformer in the network transformer is not connected with a power supply or grounded any more, but receives a single-ended signal, and converts the single-ended signal into a common-mode signal by using the middle tap capacitor and the common-mode resistor which are connected with the middle tap in series and grounded, so that a twisted pair is connected through a network port and is transmitted outwards; meanwhile, the network transformer can still normally transmit differential signals. Therefore, two signals can be transmitted simultaneously, namely the differential signal corresponds to the standard Ethernet signal, and the single-ended signal corresponds to other types of signals, such as a state signal, a control signal and the like. When the network cable is used for connecting the foreground and background equipment, only one network cable is needed, and the standard Ethernet signals and other types of signals can be transmitted at the same time, so that the cost is saved, and the wiring difficulty is reduced.
Another embodiment of the present invention further provides an electronic system, as shown in fig. 5 and fig. 6, including a first electronic device and a second electronic device, where the first electronic device is provided with a first ethernet communication module 1000, the second electronic device is provided with a second ethernet communication module 2000, the first ethernet communication module 1000 and the second ethernet communication module 2000 are connected by a network cable, and the first ethernet communication module 1000 and the second ethernet communication module 2000 are the ethernet communication modules described in the foregoing embodiments.
The first ethernet communication module 1000 and the second ethernet communication module 2000 may be provided with N pairs of channels, where N is a positive integer.
The first ethernet communication module 1000 and the second ethernet communication module 2000 may include not only a network transformer and a network port, but also a physical layer chip PHY.
For specific working manners of the first ethernet communication module 1000 and the second ethernet communication module 2000, reference may be made to the description in the foregoing embodiments, and details are not described herein again.
The first electronic device and the second electronic device may transmit the main data by using a differential signal, i.e., a standard ethernet signal, through the first ethernet communication module 1000 and the second ethernet communication module 2000; meanwhile, when other types of signals need to be transmitted simultaneously, for example, the first electronic device needs to feed back a status signal to the second electronic device, the first electronic device may be connected to the middle tap of the secondary side of the transformer of one channel of the first ethernet communication module 1000 by using other types of signals, that is, the main data and other types of signals may be transmitted simultaneously through the network cable. It is understood that the first ethernet communication module 1000 and the second ethernet communication module 2000 can use a plurality of channels for transmitting other types of signals according to actual requirements.
The electronic system uses the ethernet communication module according to the foregoing embodiment, and thus has the advantages of the foregoing embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An Ethernet communication module for simultaneously transmitting two signals is characterized by comprising a network transformer and a network port, wherein the network transformer is provided with N pairs of channels, and N is a positive integer; each pair of channels is used for transmitting a pair of differential signals;
each pair of channels comprises an input end and an output end, wherein the input end is used for receiving a pair of differential signals, the output ends of the channels are connected with the network port, and the output ends of the channels output the differential signals to the twisted pair through the network port;
each pair of channels is provided with a transformer with a center tap, and the primary side of the transformer receives differential signals transmitted by the input ends of the channels; the two ends of the secondary side of the transformer form the output ends of the channels;
the middle tap of the secondary side of the transformer is grounded through a middle tap capacitor and a common mode resistor which are connected in series; and the intermediate tap at the secondary side of the transformer receives a single-ended signal to be transmitted, and transmits the single-ended signal to a twisted pair through the output end of the channel and the network port.
2. An ethernet communication module according to claim 1, wherein each pair of channels comprises a common-mode inductor, a transformer, a common-mode capacitor, and a common-mode resistor, and an input terminal of the common-mode inductor is used as an input terminal of the channel for receiving a pair of differential signals; the output end of the common mode inductor is connected with the primary side of the transformer; the middle tap of the primary side of the transformer is connected with a power supply; two ends of the secondary side of the transformer are used as output ends of the channel and are connected with the network port; the middle tap of the secondary side of the transformer is grounded through the middle tap capacitor and the common-mode resistor which are connected in series; and the middle tap of the secondary side of the transformer is also used for receiving a single-ended signal to be transmitted.
3. An ethernet communications module according to claim 1, wherein each pair of channels further comprises a first filter capacitor, said power supply being connected to ground through said first filter capacitor.
4. An ethernet communication module according to claim 2, wherein each pair of channels further comprises a first resistor, a second resistor, a first capacitor, one of the input terminals of said common mode inductor being connected to ground via said first resistor and said first capacitor; and the other pole of the input end of the common mode inductor is grounded through the second resistor and the first capacitor.
5. The ethernet communication module according to claim 1, wherein the intermediate tap on the secondary side of the transformer receives a single-ended signal to be transmitted by using capacitive coupling or transformer coupling.
6. The Ethernet communication module according to claim 1, further comprising an anti-surge diode, a first current limiting resistor and a second current limiting resistor, wherein the first current limiting resistor and the second current limiting resistor are connected in series between a middle tap of the secondary side of the transformer and a single-ended signal to be transmitted, a junction of the first current limiting resistor and the second current limiting resistor is connected to a cathode of the anti-surge diode, and an anode of the anti-surge diode is grounded.
7. The ethernet communication module according to claim 1, further comprising a physical layer chip, wherein the physical layer chip is connected to the input terminal of the network transformer for transmitting and receiving differential signals.
8. The ethernet communication module of claim 1, further comprising a data transmission indicator light and a status indicator light for indicating whether the ethernet communication module has data in transmission and connection status.
9. An ethernet communications module according to claim 1, wherein said network port is an RJ45 port, said network port and network transformer being integrated together as an RJ45 connector with a network transformer.
10. An electronic system, comprising a first electronic device and a second electronic device, wherein the first electronic device is provided with a first ethernet communication module, the second electronic device is provided with a second ethernet communication module, the first ethernet communication module and the second ethernet communication module are connected by a network cable, and the first ethernet communication module and the second ethernet communication module are the ethernet communication modules according to any one of claims 1 to 9.
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