CN119544391A - Power supply equipment, powered equipment and Ethernet power supply system - Google Patents
Power supply equipment, powered equipment and Ethernet power supply system Download PDFInfo
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- CN119544391A CN119544391A CN202311113716.8A CN202311113716A CN119544391A CN 119544391 A CN119544391 A CN 119544391A CN 202311113716 A CN202311113716 A CN 202311113716A CN 119544391 A CN119544391 A CN 119544391A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The application provides power supply equipment, power receiving equipment and a power over Ethernet system, and belongs to the technical field of power over Ethernet. In the scheme provided by the application, the positive electrode of a direct current power supply end in power supply equipment and power receiving equipment is connected with a center tap of a transformer, the negative electrode of the direct current power supply end is connected with a shielding layer for shielding a differential line, and two signal lines in the differential line are connected with two ends of the transformer. Based on the connection mode, two signal lines in the shielding differential line are in parallel connection, so that the direct current resistance of the shielding differential line is effectively reduced. Therefore, the power loss and the voltage loss of the shielding differential line can be effectively reduced.
Description
Technical Field
The present application relates to the field of power over ethernet technologies, and in particular, to a power supply device, a power receiving device, and a power over ethernet system.
Background
Single pair ethernet (SINGLE PAIR ETHERNET, SPE) is a technology for ethernet data transmission over a single twisted pair. And, the SPE also allows the power sourcing equipment (power sourcing equipment, PSE) to power its connected Powered Device (PD) over the data line power (power over data line, poDL).
In PoDL systems (which may also be referred to as single-pair wire ethernet power sourcing systems), the positive pole of a PSE chip in a power sourcing device is connected to the positive side of a twisted pair wire and the negative pole of the PSE chip is connected to the negative side of the twisted pair wire. The positive pole of PD chip in the power receiving equipment is connected with the positive phase end of paired line, and the negative pole of PD chip is connected with the reverse phase end of paired line.
Based on the connection relationship, the positive phase end and the negative phase end of the twisted pair are in series connection. This results in a larger dc resistance of the twisted pair and thus a larger power loss and voltage loss.
Disclosure of Invention
The application provides power supply equipment, power receiving equipment and a power over Ethernet system, which can solve the technical problems of larger power loss and voltage loss of a PoDL system in the related technology.
In a first aspect, a power supply device is provided, which is applied to a power over ethernet system, and the power over ethernet system further includes a power receiving device, where the power supply device is connected to the power receiving device through a shielded differential line. The power supply device comprises a power supply chip and a transformer. The positive pole of the power supply end of the power supply chip is connected with the center tap of the first side of the transformer, and the negative pole of the power supply end of the power supply chip is connected with the shielding layer of the shielding differential line. One end of the first side of the transformer is connected with a first signal line in the shielding differential line, and the other end of the first side of the transformer is connected with a second signal line in the shielding differential line. Wherein the first side of the transformer is one of a primary side and a secondary side.
Based on the connection mode of the shielding differential line, two signal lines in the shielding differential line are in parallel connection, so that the direct-current resistance of the shielding differential line is effectively reduced, and further the power loss and the voltage loss of the shielding differential line can be effectively reduced.
Optionally, the power supply device may further include a physical layer chip connected to the second side of the transformer, which may be the other of the primary side and the secondary side.
It is understood that the physical layer chip may be used to interact data signals with the physical layer chip in the powered device by masking the differential line. The transformer can be used for realizing signal coupling between two physical layer chips and can be used for prolonging the transmission distance of signals.
Alternatively, the first side of the transformer may be directly connected to the shielding differential line. That is, no capacitor is required to be arranged between the first side of the transformer and the shielding differential line, so that the structure of the power supply equipment is effectively simplified, and the cost of the power supply equipment is reduced.
For example, one end of the first side of the transformer may be directly connected to the first signal line in the shielding differential line through a wire, and the other end of the first side of the transformer may be directly connected to the second signal line in the shielding differential line through a wire.
Optionally, the positive electrode of the power supply end of the power supply chip is directly connected with the center tap of the first side of the transformer. That is, no inductance is required to be arranged between the positive electrode of the power supply end of the power supply chip and the transformer, so that the structure of the power supply equipment is effectively simplified, and the cost of the power supply equipment is reduced.
Optionally, the negative electrode of the power supply end of the power supply chip is directly connected with the shielding layer of the shielding differential line. That is, no inductance is required to be arranged between the negative electrode of the power supply end of the power supply chip and the shielding differential line, so that the structure of the power supply equipment is effectively simplified, and the cost of the power supply equipment is reduced.
The positive pole of the power supply end of the power supply chip and the transformer can be directly connected through a wire, and the negative pole of the power supply end of the power supply chip and the shielding differential line can also be directly connected through a wire.
In a second aspect, a powered device is provided, for use in a power over ethernet system, the power over ethernet system further comprising a power sourcing device, the powered device being connected to the power sourcing device by a shielded differential line. The power receiving device comprises a power receiving chip and a transformer, wherein the positive electrode of the power receiving end of the power receiving chip is connected with a center tap of the first side of the transformer, and the negative electrode of the power receiving end of the power receiving chip is connected with a shielding layer for shielding a differential line. One end of the first side of the transformer is connected with a first signal line in the shielding differential line, and the other end of the first side of the transformer is connected with a second signal line in the shielding differential line. Wherein the first side of the transformer is one of a primary side and a secondary side.
Based on the connection mode of the shielding differential line, two signal lines in the shielding differential line are in parallel connection, so that the direct-current resistance of the shielding differential line is effectively reduced, and further the power loss and the voltage loss of the shielding differential line can be effectively reduced.
Optionally, the powered device may further include a physical layer chip connected to a second side of the transformer, which may be the other of the primary side and the secondary side.
It is understood that the first side of the transformer in the powered device and the first side of the transformer in the power supply device may be of the same type, i.e. both are secondary sides or both are primary sides. Correspondingly, the second side of the transformer in the powered device is the same as the second side of the transformer in the power supply device, i.e. both sides are primary sides or both sides are secondary sides.
Alternatively, the first side of the transformer may be directly connected to the shielding differential line. That is, no capacitor is required to be arranged between the first side of the transformer and the shielding differential line, so that the structure of the power receiving equipment is effectively simplified, and the cost of the power receiving equipment is reduced.
Optionally, the positive electrode of the power receiving end of the power receiving chip is directly connected with the center tap of the first side of the transformer. That is, no inductance is required to be arranged between the positive electrode of the power receiving end of the power receiving chip and the transformer, so that the structure of the power receiving equipment is effectively simplified, and the cost of the power receiving equipment is reduced.
Optionally, the negative electrode of the power receiving end of the power receiving chip is directly connected with the shielding layer of the shielding differential line. That is, no inductance is required to be arranged between the negative electrode of the power receiving end of the power receiving chip and the shielding differential line, so that the structure of the power receiving equipment is effectively simplified, and the cost of the power receiving equipment is reduced.
For example, the positive electrode of the power receiving end of the power receiving chip and the transformer may be directly connected through a wire, and the negative electrode of the power receiving end of the power receiving chip and the shielding differential line may also be directly connected through a wire.
In a third aspect, a power over ethernet system is provided, comprising a power sourcing equipment as provided in the first aspect, a powered device as provided in the second aspect, and a shielded differential line. Wherein the power supply apparatus and the power receiving apparatus may be connected through the shielded differential line.
It is understood that the power supply device is capable of supplying power to the power receiving device through the shielded differential line, and is capable of interacting data with the power receiving device through the shielded differential line. And moreover, the Ethernet power supply system can be applied to various power supply scenes such as park fire control monitoring, building automation, industrial control or vehicle-mounted.
It is also understood that the power over ethernet system may be a point-to-point power over ethernet system that employs single-pair wire ethernet technology, i.e., one power sourcing device in the power over ethernet system may be connected to and power one powered device through a pair of shielded differential wires.
Alternatively, the shielded differential lines may be twisted pair lines, parallel lines, or power lines. And, the material of the shielding layer in the shielding differential line is a metal material, and the metal material may include aluminum and/or copper, etc.
In summary, the present application provides a power supply device, a power receiving device, and a power over ethernet system. In the scheme provided by the application, the positive electrode of a direct current power supply end in power supply equipment and power receiving equipment is connected with a center tap of a transformer, the negative electrode of the direct current power supply end is connected with a shielding layer for shielding a differential line, and two signal lines in the differential line are connected with two ends of the transformer. Based on the connection mode, two signal lines in the shielding differential line are in parallel connection, so that the direct current resistance of the shielding differential line is effectively reduced. Therefore, the power loss and the voltage loss of the shielding differential line can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a power over Ethernet system in the related art;
FIG. 2 is a schematic diagram of a DC power signal and a valid data signal in the system of FIG. 1;
Fig. 3 is a schematic diagram of a power over ethernet system according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a shielding differential line according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another shielding differential line according to an embodiment of the present application;
Fig. 6 is a schematic diagram of current flow in a power over ethernet system according to an embodiment of the present application.
Detailed Description
The power supply device, the power receiving device and the power over ethernet system provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
In order to make the technical solution provided by the embodiments of the present application clearer, before specifically describing the technical solution provided by the embodiments of the present application, explanation of related terms is first performed.
1. Common mode signals (common mode signal, CMS), also known as ground-induced signals or asymmetric signals, refer to noise from the two signal lines to ground, respectively, which are equal in magnitude and have a phase difference of 0.
2. Differential mode signals (DIFFERENTIAL MODE SIGNAL, DMS), also known as normal mode, serial mode, line-to-line induced or symmetric signals, etc., refer to the difference in signals between two signal lines, which are equal in magnitude and 180 ° out of phase.
3. Positive phase signal (positive signal), a positive phase signal in a pair of differential signals. Accordingly, the positive (P) terminal may refer to a signal line of a pair of differential lines (e.g., twisted pair) carrying a positive signal.
4. An inverted signal (NEGATIVE SIGNAL), an inverted signal of the pair of differential signals. Accordingly, the inverting (N) terminal may be a signal line of a pair of differential lines (e.g., twisted pair) carrying an inverted signal.
5. Shielded twisted pair cable (SHIELDED TWISTED-pair cable, STP), a copper twisted pair that is widely used for data transmission. Physically, shielded twisted pair cables have more shielding than unshielded twisted pair cables. By masking, noise is reduced, thereby providing a cleaner channel.
Current single-wire ethernet technology for industrial settings may implement fieldbus internet protocol (Internet protocol, IP) and may also be capable of powering devices over a single twisted pair, typical standards including institute of electrical and electronics engineers (ELECTRICAL AND electronics engineers), IEEE) 802.3cg,IEEE 802.3bu, and the like.
PoDL, as an alternative to power over ethernet (power over Ethernet, poE) in industrial communications, allows for long-range communications and power between PSE and PD, enabling power over distances up to 1000 meters. Referring to fig. 1, podl comprises two main parts, PSE and PD, connected by a single twisted pair.
As shown in fig. 2, the dc supply signal (indicated by a dotted line) is a differential mode signal for the effective data signal (indicated by a solid line). The 12V of the dc power signal may be coupled to the P signal of the twisted pair, and the Ground (GND) of the dc power signal may be coupled to the N signal. It is understood that V1 in fig. 2 represents the voltage of the P signal, V2 represents the voltage of the N signal, and V DIFF represents the differential value between the P signal and the N signal.
In order to achieve coupling/decoupling of the dc power supply signal and the valid data signal without affecting signal transmission, as shown in fig. 1, additional capacitive and inductive devices are required to be added in the PoDL system. By way of example, referring to fig. 1, inductors L1 and L2, and capacitors C1 and C2 are added to the pse. The PSE chip is connected with one end of the twisted pair through inductors L1 and L2, and the transformer is connected with one end of the twisted pair through capacitors C1 and C2. The PD has added inductances L3 and L4, and capacitances C3 and C4. The PD chip is connected with the other end of the twisted pair through inductors L3 and L4, and the transformer is connected with the other end of the twisted pair through capacitors C3 and C4. The additional 4 capacitors and 4 inductors described above result in a PoDL system that is costly and structurally complex.
Also, as can be seen from the normal (P) side current flow direction and the reverse (N) side current flow direction shown in fig. 1, the P side and N side of the twisted pair (i.e., two signal lines in the twisted pair) are in a series relationship. Therefore, the direct current resistance of the twisted pair is large, which causes large transmission loss and energy waste, and simultaneously causes unnecessary voltage drop. It can be understood that when the voltage drop is severe, the input voltage of the PD terminal may not meet the operation requirement of the power receiving terminal, so that the system or the key node may not work normally.
Referring to table 1, a typical AWG18 cable is exemplified with a direct current resistance of 21.4 ohms (Ω) of 1 kilometer (km). It can also be seen from Table 1 that the AWG18 cable has an outer diameter of 1.02 millimeters (mm), i.e., 0.0403 inches (inch), and a cross-sectional area of 0.8107 square millimeters (mm 2).
TABLE 1
| AWG | Outer diameter (mm) | External diameter (inch) | Sectional area (mm 2) | Resistance value (omega/km) |
| 18 | 1.02 | 0.0403 | 0.8107 | 21.4 |
The PoDL system shown in fig. 1 employs an AWG18 cable, and the corresponding cable loss and cable drop at each power class (class) can be as shown in table 2. VCC in table 2 represents the gear of the dc voltage output by the PSE, and class0 to class9 may represent 10 different power classes. Vpsemax denotes the maximum voltage in volts (V) output by the PSE, ppsemax denotes the maximum power in watts (W) output by the PSE, imax denotes the maximum current in milliamperes (mA) output by the PSE. deltaP represents the power loss per kilometer of the AWG18 cable, the unit is W, deltaU represents the voltage loss per kilometer of the AWG18 cable, the unit is V, vpd represents the voltage available to the PD at different power levels, the unit is V, and Vpdmin represents the minimum input voltage at different power levels, at which the PD can normally operate. It will be appreciated that since the maximum power and maximum current output by the PSE are different at different power classes, the minimum input voltage at which the PD can operate properly at different power classes is also different.
Referring to Table 2, the PoDL system shown in FIG. 1 will not work properly when using class3 and class9 schemes, since the voltage available to the PD is lower than the minimum input voltage at which the PD is operating properly.
TABLE 2
The embodiment of the application provides a power over Ethernet system, which can solve the problem that the power loss and the voltage loss of a cable are large due to the fact that the direct current resistance of a twisted pair is large. As shown in fig. 3, the power over ethernet system includes a power sourcing equipment 10, a powered device 20, and a pair of shielded differential lines 30. The power supply apparatus 10 and the power receiving apparatus 20 are connected through the shield differential line 30.
Fig. 4 is a schematic structural diagram of a shielding differential line according to an embodiment of the present application. As shown in fig. 3 and 4, the shielding differential line 30 may include a first signal line 301, a second signal line 302, and a shielding layer 303. The material of the shielding layer 303 includes a metal material, which may include copper, and/or aluminum foil (foil), or the like.
Optionally, the shielding layer 303 may further include a metal mesh (braid), and the material of the metal mesh may be aluminum. Also, referring to fig. 4, the shielded differential line 30 may further include a sheath (shaping) 304. In embodiments of the present application, the shielded differential lines 30 may be twisted pair (i.e., shielded twisted pair), parallel lines, power lines, or the like.
It will be appreciated that the power over ethernet system provided in the embodiments of the present application may be a point-to-point dc power supply system, that is, one power sourcing equipment 10 in the system is connected to one powered device 20 through a pair of shielded differential lines 30, and supplies power to the one powered device 20.
It is further understood that the ethernet power supply system provided in the embodiments of the present application may be a power supply system that uses a single pair of ethernet technologies, such as a PoDL power supply system. Moreover, the system can be applied to the scenes of monitoring fire protection in a park, building automation, industrial control or vehicle-mounted and the like, which adopt a single-wire Ethernet technology for power supply.
Alternatively, the power supply device 10 in the ethernet power supply system may be a network switch, an industrial network manager, or an on-board gateway. The power receiving device 20 may be an industrial instrument, an alarm, a sensor (e.g., an in-vehicle radar), or the like.
Power sourcing equipment and powered devices in a power over ethernet system are described below.
As shown in fig. 3, the power supply device 10 in the power over ethernet system includes a power supply chip 101 and a transformer 102, the power supply chip 101 may also be referred to as a PSE chip. The positive pole VCC of the power supply end of the power supply chip 101 is connected to the center tap of the first side of the transformer 102, and the negative pole of the power supply end of the power supply chip 101 is connected to the shielding layer 303 of the shielding differential line 30. One end of the first side of the transformer 102 is connected to a first signal line 301 in the shielded differential line 30, and the other end of the first side of the transformer 102 is connected to a second signal line 302 in the shielded differential line 30.
The first side of the transformer 102 may be one of a primary side and a secondary side, for example, the primary side. Referring to fig. 3, the power supply terminal of the power supply chip 101 may also be referred to as a dc power supply terminal, and the negative electrode of the power supply terminal may be the ground terminal GND.
With continued reference to fig. 1, the powered device 20 in the power over ethernet system includes a powered chip 201 and a transformer 202, the powered chip 201 may also be referred to as a PD chip. The positive electrode VCC of the power receiving end of the power receiving chip 201 is connected to the center tap of the first side of the transformer 202, and the negative electrode (i.e., the ground end GND) of the power receiving end of the power receiving chip 201 is connected to the shielding layer 303 of the shielding differential line 30. One end of the first side of the transformer 202 is connected to a first signal line 301 in the shield differential line 30, and the other end of the first side of the transformer 202 is connected to a second signal line 302 in the shield differential line 30.
Wherein the first side of the transformer 202 may be one of a primary side and a secondary side. Also, the first side of the transformer 202 and the first side of the transformer 102 may be the same type, i.e., both are primary sides or both are secondary sides. Referring to fig. 3, the power receiving end of the power receiving chip 201 may also be referred to as a dc power source end, and the negative electrode of the power receiving end may be a ground end GND.
Based on the above connection manner, referring to fig. 5, the scheme provided by the embodiment of the present application can combine the P-end and the N-end (i.e., the first signal line 301 and the second signal line 302) in the shielding differential line 30, and use the combined P-end and the combined N-end as the positive electrode VCC of the dc voltage, and use the shielding layer 303 in the shielding differential line 30 as the backflow GND of the dc voltage. Thus, the two signal lines in the shielding differential line can be changed from the original series relationship to the parallel relationship, and further the power loss and the voltage loss of the shielding differential line 30 can be effectively reduced.
In summary, the embodiment of the application provides a power supply device, in which a positive electrode of a power supply end of a power supply chip is connected with a center tap of a first side of a transformer, and a negative electrode of the power supply end is connected with a shielding layer for shielding a differential line. The two ends of the first side of the transformer are connected to two signal lines of the shielding differential line. Based on the connection mode, two signal lines in the shielding differential line are in a parallel connection relationship, so that the power loss and the voltage loss of the shielding differential line can be effectively reduced.
The embodiment of the application also provides a power receiving device, wherein the positive electrode of the power receiving end of the power receiving chip in the power receiving device is connected with the center tap of the transformer, and the negative electrode of the power receiving end is connected with the shielding layer of the shielding differential line. The two ends of the first side of the transformer are connected to two signal lines of the shielding differential line. Based on the connection mode, two signal lines in the shielding differential line are in a parallel connection relationship, so that the power loss and the voltage loss of the shielding differential line can be effectively reduced.
Fig. 6 is a schematic diagram of current flow in a power over ethernet system according to an embodiment of the present application. As can be seen from comparing fig. 1 and fig. 6, the change of the connection relationship of the bottom layer in the scheme provided by the embodiment of the present application can change the original serial relationship into the parallel relationship between the P end and the N end (i.e., the first signal line 301 and the second signal line 302) of the shielding differential line 30. Therefore, the power loss and the voltage loss of the shielding differential line can be effectively reduced.
For example, let the equivalent dc resistance at the P-terminal (e.g., the first signal line 301) of the shield differential line 30 be Rp and the equivalent dc resistance at the N-terminal (e.g., the second signal line 302) be Rn. Since the P-terminal and the N-terminal are in a differential line relationship, the equivalent resistances of the two terminals are considered to be approximately equal, that is, rp≡rn. Also, since the shielding layer 303 of the shielding differential line 30 is a metal plane (e.g., copper plane), the equivalent dc resistance of the shielding layer 303 is negligible.
If the power loss of the shielding differential line is DeltaP, the voltage loss is DeltaU, and the passing current is I. The equivalent dc resistance R of the shielded differential line in the scheme shown in fig. 1 may then be such that r=rp+rn=2rp, the voltage loss Δu may be Δu=2rp×i, and the power loss Δp may be Δp=2rp×i×i.
Accordingly, the equivalent resistance R of the shielding differential line 30 in the embodiment of the present application may satisfy R=Rp// Rn=Rp/2, the voltage loss DeltaU may be DeltaU=Rp/2×I, and the power loss DeltaP may be DeltaP=Rp/2×I×I.
Based on the analysis, the scheme provided by the embodiment of the application can change the serial connection relation of two signal wires in the shielding differential line into the parallel connection relation, so that the power loss of the cable can be changed into 25% of the original power loss, and the voltage loss of the cable can be changed into 25% of the original power loss. That is, the scheme provided by the embodiment of the application effectively reduces the power loss and the voltage loss of the cable.
The cable loss and cable pressure drop corresponding to the schemes provided by the embodiments of the present application at each power level may be shown in table 3. As can be seen from comparing table 2 and table 3, when the schemes of class3 and class9 are adopted, the PD can work normally because the voltage available to the PD is greater than the minimum input voltage when the PD works normally.
TABLE 3 Table 3
Optionally, as shown in fig. 3, the power supply device 10 may further include a Physical (PHY) chip 103, where the PHY chip 103 is connected to the second side of the transformer 102. It is understood that the second side of the transformer 102 may be the other of the primary side and the secondary side, for example, the secondary side.
Optionally, with continued reference to fig. 3, the powered device 20 may further include a physical layer chip 203, the physical layer chip 203 being connected to the second side of the transformer 202. It is understood that the second side of the transformer 202 may be the other of the primary side and the secondary side. Also, the second side of the transformer 202 and the second side of the transformer 102 may be the same type, i.e., both are secondary sides, or both are primary sides.
It is also understood that the physical layer chip 103 in the power supply apparatus 10 may be used to interact data signals with the physical layer chip 203 in the powered apparatus 20 by shielding the differential line 30. The transformers 102 and 202 may be used to achieve signal coupling between two physical layer chips and may be used to extend the transmission distance of the signals.
Alternatively, as shown in fig. 3, the first side of the transformer 102 in the power supply apparatus 10 may be directly connected to the shielding differential line 30. That is, no capacitor is required between the first side of the transformer 102 and the shielding differential line 30, thereby effectively simplifying the structure of the power supply apparatus 10 and reducing the cost of the power supply apparatus 10.
For example, one end of the first side of the transformer 102 may be directly connected to the first signal line 301 in the shielded differential line 30 by a wire, and the other end of the first side of the transformer 102 may be directly connected to the second signal line 302 in the shielded differential line 30 by a wire.
With continued reference to fig. 3, a first side of the transformer 202 in the powered device 20 may be directly connected to the shielded differential line 30. That is, no capacitor is required between the first side of the transformer 202 and the shielding differential line 30, so that the structure of the power receiving apparatus 20 is effectively simplified, and the cost of the power receiving apparatus 20 is reduced.
For example, one end of the first side of the transformer 202 may be directly connected to the first signal line 301 in the shielded differential line 30 by a wire, and the other end of the first side of the transformer 202 may be directly connected to the second signal line 302 in the shielded differential line 30 by a wire.
Alternatively, as shown in fig. 3, the positive pole of the power supply terminal of the power supply chip 101 is directly connected to the center tap of the first side of the transformer 102. The negative electrode of the power supply end of the power supply chip 101 may be directly connected to the shielding layer 303 of the shielding differential line 30. That is, no inductance is required between the power supply chip 101 and the transformer 102 and between the power supply chip and the shielding differential line 30, so that the structure of the power supply apparatus 10 is effectively simplified, and the cost of the power supply apparatus 10 is reduced.
For example, the positive electrode of the power supply end of the power supply chip 101 and the transformer 102 may be directly connected through a wire, and the negative electrode of the power supply end of the power supply chip 101 and the shielding differential line 30 may also be directly connected through a wire.
With continued reference to fig. 3, the positive electrode of the power receiving end of the power receiving chip 201 may be directly connected to the center tap of the first side of the transformer 202. The negative electrode of the power receiving end of the power receiving chip 201 may be directly connected to the shielding layer 303 of the shielding differential line 30. That is, no inductance is required between the power receiving chip 201 and the transformer 202 and between the power receiving chip and the shield differential line 30, so that the structure of the power receiving apparatus 20 is effectively simplified, and the cost of the power receiving apparatus 20 is reduced.
For example, the positive electrode of the power receiving end of the power receiving chip 201 and the transformer 202 may be directly connected by a wire, and the negative electrode of the power receiving end of the power receiving chip 201 and the shielding differential line 30 may also be directly connected by a wire.
In the conventional scheme, as shown in fig. 1 and 2, VCC is coupled to the P terminal of the twisted pair and GND is coupled to the N terminal of the twisted pair, so that the dc power supply signal is a differential mode signal with respect to the data signal. In the embodiment of the present application, the positive pole VCC (e.g. 12V) of the power supply terminal of the power supply chip 101 is directly coupled to the center tap of the transformer, and the shielding layer 303 in the shielding differential line 30 is used as the reflow Ground (GND). At this time, the dc power VCC (e.g., 12V) is a common mode signal with respect to the P signal and the N signal in the differential signal. Therefore, in the scheme provided by the embodiment of the application, 4 capacitors and 4 inductors used for coupling/decoupling are not required to be arranged in the power supply equipment 10 and the power receiving equipment 20, so that the circuit complexity is effectively simplified, and the material cost is reduced.
It will be appreciated that an inductance may also be provided between the positive pole of the power supply terminal of the power supply chip 101 and the center tap of the transformer 102. An inductance may be provided between the negative electrode of the power supply terminal of the power supply chip 101 and the shielding layer 303 of the shielding differential line 30. The embodiment of the present application is not limited thereto.
Similarly, an inductance may be provided between the positive electrode of the power receiving end of the power receiving chip 201 and the center tap of the transformer 202. An inductance may be provided between the negative electrode of the power receiving end of the power receiving chip 201 and the shielding layer 303 of the shielding differential line 30. The embodiments of the present application are not limited in this regard.
In summary, the embodiment of the application provides a power supply device, a power receiving device and a power over ethernet system. In the scheme provided by the embodiment of the application, the positive electrode of the direct current power supply end in the power supply equipment and the power receiving equipment is connected with the center tap of the transformer, the negative electrode of the direct current power supply end is connected with the shielding layer of the shielding differential line, and the two signal lines in the shielding differential line are connected with the two ends of the transformer. Based on the connection mode, two signal lines in the shielding differential line are in parallel connection, so that the direct current resistance of the shielding differential line is effectively reduced. Therefore, the power loss and the voltage loss of the shielding differential line can be effectively reduced.
Based on the connection method, the mathematical relationship between the dc power supply signal and the effective data signal may be changed from the differential mode relationship to the common mode relationship. Therefore, the coupling/decoupling structure of power supply and communication can be simplified, and the cost and the structural complexity of the power over Ethernet system are effectively reduced. For example, the scheme provided by the embodiment of the application can save 4 capacitors and 4 inductors.
It can be understood that the scheme provided by the embodiment of the application is not limited by the transmission mechanism, the propagation medium and the use scene of the effective data signal, and can be adopted as long as the differential cable with the shielding layer exists. The transmission mechanism of the effective data signal may include single carrier pulse amplitude modulation (pulse amplitude modulation, PAM), discrete multitone (discrete multitone, DMT) modulation, orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM), or the like. The differential transmission medium with the shielding layer may be twisted pair, parallel lines, power lines, or the like. The usage scenario may be a campus scenario, an industrial scenario, or an in-vehicle scenario, among others.
In embodiments of the present application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "at least one" means one or more, and "a plurality" means two or more.
The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, while a and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the application has been described in terms of various alternative embodiments, it will be apparent to those skilled in the art that various equivalent modifications and alterations can be made without departing from the scope of the application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (12)
1. The power supply equipment is characterized by being applied to a power over Ethernet system, and further comprises power receiving equipment, wherein the power supply equipment is connected with the power receiving equipment through a shielding differential line;
The positive electrode of the power supply end of the power supply chip is connected with the center tap of the first side of the transformer, and the negative electrode of the power supply end of the power supply chip is connected with the shielding layer of the shielding differential line;
one end of the first side of the transformer is connected with a first signal line in the shielding differential line, and the other end of the first side of the transformer is connected with a second signal line in the shielding differential line;
Wherein the first side of the transformer is one of a primary side and a secondary side.
2. The power supply apparatus of claim 1, further comprising a physical layer chip, the physical layer chip being coupled to a second side of the transformer, the second side of the transformer being the other of the primary side and the secondary side.
3. A power supply device according to claim 1 or 2, characterized in that the first side of the transformer is directly connected to the shielding differential line.
4. A power supply device according to any one of claims 1 to 3, characterized in that the positive pole of the power supply terminal of the power supply chip is directly connected to the center tap of the first side of the transformer.
5. The power supply apparatus according to any one of claims 1 to 4, wherein a negative electrode of a power supply end of the power supply chip is directly connected to the shielding layer of the shielding differential line.
6. The power receiving equipment is characterized by being applied to a power over Ethernet system, and further comprises power supply equipment, wherein the power receiving equipment is connected with the power supply equipment through a shielding differential line;
The positive electrode of the power receiving end of the power receiving chip is connected with the center tap of the first side of the transformer, and the negative electrode of the power receiving end of the power receiving chip is connected with the shielding layer of the shielding differential line;
one end of the first side of the transformer is connected with a first signal line in the shielding differential line, and the other end of the first side of the transformer is connected with a second signal line in the shielding differential line;
Wherein the first side of the transformer is one of a primary side and a secondary side.
7. The powered device of claim 6, further comprising a physical layer chip coupled to a second side of the transformer, the second side of the transformer being the other of the primary side and the secondary side.
8. The power receiving apparatus according to claim 6 or 7, wherein a first side of the transformer is directly connected to the shield differential line.
9. The power receiving apparatus according to any one of claims 6 to 8, wherein a positive electrode of a power receiving end of the power receiving chip is directly connected to a center tap of the first side of the transformer.
10. The power receiving apparatus according to any one of claims 6 to 9, wherein a negative electrode of a power receiving end of the power receiving chip is directly connected to a shielding layer of the shielding differential line.
11. A power over ethernet system comprising a power sourcing equipment as claimed in any one of claims 1 to 5, a powered device as claimed in any one of claims 6 to 10, and a shielded differential line;
wherein the power supply apparatus and the power receiving apparatus are connected through the shielded differential line.
12. The system of claim 11, wherein the shielded differential lines are twisted pair, parallel lines, or power lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311113716.8A CN119544391A (en) | 2023-08-30 | 2023-08-30 | Power supply equipment, powered equipment and Ethernet power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311113716.8A CN119544391A (en) | 2023-08-30 | 2023-08-30 | Power supply equipment, powered equipment and Ethernet power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119544391A true CN119544391A (en) | 2025-02-28 |
Family
ID=94710993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311113716.8A Pending CN119544391A (en) | 2023-08-30 | 2023-08-30 | Power supply equipment, powered equipment and Ethernet power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119544391A (en) |
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2023
- 2023-08-30 CN CN202311113716.8A patent/CN119544391A/en active Pending
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