CN201294537Y - Power receiving equipment and electric power system of Ethernet electric power system - Google Patents
Power receiving equipment and electric power system of Ethernet electric power system Download PDFInfo
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- CN201294537Y CN201294537Y CNU2008201233526U CN200820123352U CN201294537Y CN 201294537 Y CN201294537 Y CN 201294537Y CN U2008201233526 U CNU2008201233526 U CN U2008201233526U CN 200820123352 U CN200820123352 U CN 200820123352U CN 201294537 Y CN201294537 Y CN 201294537Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The utility model discloses a power supply device in an Ethernet power supply system, which is used to solve the problem in the prior art that the power supply device in the Ethernet power supply system interferes other equipment because of producing strong electromagnetic interference. The power supply system comprises a power module, an Ethernet power supply control module, an Ethernet port module, wherein the power module is connected with the Ethernet power supply control module, the Ethernet port module is connected with the Ethernet power supply control module, and a first common-mode filter circuit module is further connected between the power module and the Ethernet power supply control module in series. The utility model further discloses a power receiving device in an Ethernet power supply system, which is used to solve the effect in the prior art that the power receiving device is interfered by electromagnetic which is produced by other power supply devices, and comprises an Ethernet port module and a work circuit module, wherein the work circuit module is connected with the Ethernet port module, and a common-mode filter circuit is connected between the Ethernet port module and the work circuit module in series.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to power supply unit and power receiving equipment in the Power over Ethernet system.
Background technology
(Power over Ethernet, PoE) technology is a kind of by Ethernet cable conveying direct current (Direct Current, method DC) in the transmission data to Power over Ethernet.In the PoE system, provide the equipment of power supply be called as power supply unit (Power Sourcing Equipment, PSE), PSE equipment has router, Ethernet switch and hub etc. at present; The galvanic equipment that accepting PSE equipment is provided is called power receiving equipment (Powered Device, PD), PD equipment is connected with PSE equipment by the Ethernet cable, when can realize that PD equipment receives the data of PSE equipment transmission, also can receive the DC direct current that PSE equipment transports.PD equipment is used very extensive, as voice IP (Voice Internet Protocol) telephone set, supervisory control system, wireless network access device, cash register pos machine, network camera, ATM (Automatic Teller Machine, ATM) etc.
Referring to Fig. 1, be the structured flowchart of Power over Ethernet system in the prior art, PSE equipment such as PoE Ethernet exchange 102 is responsible for direct current is injected into Ethernet cable 103 among the figure; This Ethernet cable 103 is in the transmission data, also transmit direct current to other network equipments that are connected with this PSE equipment, voice IP phone 104, supervisory control system 105, wireless network access device 106 and credit card terminal 107 etc., mininet equipment just can connect by Ethernet and powers like this, and do not need to use the supply socket of the alternating current line of force, thereby simplified wiring, reduced the construction cost of network infrastructure.In addition, local area network (LAN) power supply by ups power 101 (Uninterruptible Power System, uninterruptible power system) backup can also make network equipment operate as normal when grid power blackout, as black phone, when having a power failure, still can normally use.
The PoE The Application of Technology more and more widely, a large amount of new application are still constantly emerging in large numbers, but, the thing followed is that PSE equipment (as Ethernet switch) has brought severe electromagnetic interference problem, as disturbing the network data of being transmitted, influence the operate as normal of connected PD equipment and peripheral electronic equipment.The PoE technology generally is applied on the end product, and these products extensively are distributed in people's life periphery, thereby the electromagnetic radiation that PSE equipment is produced will damage human body.
Referring to Fig. 2, power supply circuit for the Ethernet switch (PoE Ethernet switch) of available technology adopting PoE technology, in this circuit, ethernet physical layer PHY (Physical Layer, physical layer) chip 1, matching network circuit 2, isolating transformer circuit 3 and ethernet port module 4 are connected successively; The module relevant with power supply comprises DC power supply DC-DC module 6, Power over Ethernet control module 8 and ethernet port module 4, wherein, DC power supply DC-DC module 6 is in series with Power over Ethernet control module 8, Power over Ethernet control module 8 is connected with ethernet port module 4 by the pin of isolating transformer circuit 3, when PD equipment 5 is connected with ethernet port module 4 by the Ethernet cable, DC power supply DC-DC module 6 transfers to Power over Ethernet control module 8 with direct current, Power over Ethernet control module 8 is loaded into direct current in the Ethernet cable by ethernet port module 4, and finally is transferred to PD equipment 5.
Fig. 3 shows PSE equipment in the prior art, test result as the electromagnetism Interference of an ethernet port in the PoE Ethernet switch, the peak frequency point of the electromagnetism Interference in the analysis chart is respectively the fundamental frequency 300kHz of 300kHz, 2 frequency multiplication 600kHz, 3 frequency multiplication 900kHz etc., as can be seen from the figure the electromagnetism Interference of this PoE supply network port has substantially exceeded the electromagnetism Interference limit value (thick line is the limit value of standard code among Fig. 3) of correlation standard, electromagnetism Interference maximum as this network port of testing at the 300kHz frequency, be 43dBuA, and correlation standard is 35dBuA at the conducted interference limit value of 300kHz frequency, so the electromagnetism Interference of this network port 8dBuA that exceeded standard.
Fig. 4 shows in the prior art test result of the complete machine radiation of a PoE Ethernet switch that has 24 ethernet port modules, the exhibition frequency analysis is done at 30MHz frequency place among the figure, as shown in Figure 5, the fundamental frequency 300kHz of 300kHz, 2 frequency multiplication 600kHz, 3 frequency multiplication 900kHz etc. as can be seen, as can be seen from the figure the radiated interference of this complete machine has surpassed the complete machine radiated interference limit value (thick line among Fig. 4 is the limit value of standard code, and circled is the frequency that exceeds standard) of correlation standard.
In sum, in the prior art, PSE equipment produces extremely strong electromagnetic interference and radiation to PD equipment, and this electromagnetic interference and radiation be well beyond the setting limit of relevant criterion, thereby influences the operate as normal of the network equipment.
The utility model content
One of the utility model purpose is to provide the power supply unit in a kind of Power over Ethernet system, to solve that power supply unit in the prior art produces electromagnetic interference and the problem that influences miscellaneous equipment work.
Power supply unit in a kind of Power over Ethernet system, comprise: power module, the Power over Ethernet control module that is connected with power module, the ethernet port module that is connected with the Power over Ethernet control module also is serially connected with the first common mode filtering circuit module between power module and Power over Ethernet control module.
In the power supply unit that the utility model embodiment provides, between power module and Power over Ethernet control module, be serially connected with the first common mode filtering circuit module, filter action by this first common mode filtering circuit module can partly or entirely filter out the common mode interference signal that power module produces, suppressing or to reduce the electromagnetic interference signal that produces by power supply unit, and then eliminate or reduce the influence of electromagnetic interference other equipment.
Two of the utility model purpose is to provide the power receiving equipment in a kind of Power over Ethernet system, to solve the problem that power receiving equipment in the prior art is subjected to the influence of the electromagnetic interference that the power supply unit to its power supply produces.
Power receiving equipment in a kind of Power over Ethernet system comprises the ethernet port module, and the operating circuit module that is connected with the ethernet port module is serially connected with the common mode filtering circuit module between ethernet port module and operating circuit module.
In the power receiving equipment that the utility model embodiment provides, between ethernet port module and operating circuit module, be serially connected with the common mode filtering circuit module, filter action by this common mode filtering circuit module can partly or entirely filter out the common mode interference signal the electromagnetic interference that sends from power supply unit, to suppress or to reduce the influence to this power receiving equipment of electromagnetic interference that power supply unit produces.
Description of drawings
Fig. 1 is a PoE Power over Ethernet system architecture diagram in the prior art;
Fig. 2 is the power supply circuit construction figure of PoE Ethernet switch in the prior art;
Fig. 3 is the electromagnetism Interference curve chart of one of them ethernet port module of the PoE Ethernet switch among Fig. 2;
Fig. 4 is the curve chart of the complete machine electromagnetic interference of a PoE Ethernet switch that has 24 ethernet port modules in the prior art;
Fig. 5 schemes frequently for the exhibition of the complete machine electromagnetic interference of the PoE Ethernet switch among Fig. 4;
Fig. 6 is the power supply circuit construction figure of the PoE Ethernet switch among the utility model embodiment one;
Fig. 7 is the circuit diagram of the common mode inhibition device among the utility model embodiment one;
Fig. 8 is the performance diagram of the common code impedance and the differential mode impedance of the common mode inhibition device among the utility model embodiment;
Fig. 9 is the electromagnetism Interference curve chart of one of them ethernet port module of the PoE Ethernet switch among the utility model embodiment one;
Figure 10 is the curve chart of the complete machine electromagnetic interference of the PoE Ethernet switch that 24 ethernet port modules are arranged among the utility model embodiment one;
Figure 11 is the power supply circuit construction figure of the PoE Ethernet switch among the utility model embodiment two;
Figure 12 is the internal circuit configuration figure of the power receiving equipment among the utility model embodiment three.
Embodiment
The utility model embodiment provides the power supply unit and the power receiving equipment of Power over Ethernet system, with the electromagnetic interference of eliminating or minimizing is produced by the PoE power supply unit.The PoE power supply unit can comprise PoE Ethernet switch, router and hub etc., because the power supply circuit construction of various PoE power supply units inside is similar substantially, describe for convenient, power supply unit among the utility model embodiment is an example with the PoE Ethernet switch, below in conjunction with Figure of description embodiment of the present utility model is described in detail.
Embodiment one
The utility model embodiment provides a kind of PoE Ethernet switch, and this PoE Ethernet switch is to filter out the electromagnetic interference that himself produces by the filter circuit of portion's increase within it.
Referring to Fig. 6, power supply circuit construction figure for the PoE Ethernet switch among the utility model embodiment one, the difference of PoE Ethernet switch (referring to Fig. 2) is in this PoE Ethernet switch and the prior art, also is serially connected with a filter circuit 7 between the DC power supply DC-DC module 6 of this PoE Ethernet switch and the Power over Ethernet control module 8.
The structure of filter circuit 7 is as shown in Figure 6: be serially connected with a common mode inhibition device CM1 between the power positive cathode line of the power positive cathode line of DC power supply DC-DC module 6 outputs and Power over Ethernet control module 8 inputs; Between positive source line 701 between DC power supply DC-DC module 6 and the common mode inhibitor CM1 and power-polar curve 702, be connected with capacitor C X1, between positive source line 703 between common mode inhibition device CM1 and the Power over Ethernet control module 8 and power-polar curve 704, be connected with capacitor C X2; Between power-polar curve 702 and ground, be connected with capacitor C Y11, between positive source line 701 and ground, be connected with capacitor C Y12; Between power-polar curve 704 and ground, be connected with capacitor C Y21, between positive source line 703 and ground, be connected with capacitor C Y22.Wherein, capacitor C Y11, CY12, CY21, CY22 can be arranged on the position near output as far as possible.
Common mode inhibition device CM1 can be by two coils respectively on the ferrite bead of low-loss, high permeability, be illustrated in figure 7 as a kind of winding mode of common mode inhibition device CM1: the input wiring terminal A of a coil is connected with the positive source line 701 of DC power supply DC-DC module 6 outputs, and the output line terminal C of this coil is connected with the positive source line 703 of the input of Power over Ethernet control module 8; The input wiring terminal B of another coil is connected with the power-polar curve 702 of DC power supply DC-DC module 6 outputs, and the output line terminal D of this coil is connected with the power-polar curve 704 of the input of Power over Ethernet control module 8.Common mode inhibition device CM1 is positioned at total output of DC power supply DC-DC module 6, and rated current is bigger, and therefore, corresponding increase is also wanted in the line of common mode inhibition device CM1 footpath, so that can bear bigger electric current.
Suppress effect in order to reach better electromagnetic interference, the equivalent series resistance of capacitor C X1, CY11, CY12, CX2, CY21 and CY22 should be as far as possible little, therefore, above-mentioned electric capacity can be selected the little a lot of ceramic condenser of resistance value ratio alminium electrolytic condenser resistance for use, as selecting the 0.47uF/100V ceramic condenser for use.In order to reduce the equivalent series resistance of capacitor C X1, CY11, CY12, CX2, CY21 and CY22, can also substitute capacitor C X1 as electric capacity by the mode that inserts a plurality of electric capacity in parallel with one group of parallel connection.Can be to any one or a plurality of replacement of carrying out aforesaid way among capacitor C X1, CY11, CY12, CX2, CY21 and the CY22.In addition, capacitor C X1, CX2, CY11, CY12, CY21, the CY22 connection cabling on PCB (Print CircuitBoard, printed circuit board (PCB)) circuit board should be lacked as far as possible and be thick.
Because the electromagnetic interference of PoE power supply unit mainly is the switching frequency generation by power module, the electromagnetic interference signal that switching frequency produces is injected into the Ethernet cable and is loaded into PoE port module 4 along with direct current in the common mode disturbances mode, and goes out by Ethernet cable conduct radiation.The π type filter circuit that capacitor C X1 and CX2 and common mode inhibitor CM1 form can filter out the noise jamming that the switching frequency of DC power supply DC-DC module 6 produces, to reduce electromagnetic radiation; The common mode interference signal of DC power supply DC-DC module 6 generations has so just been eliminated on the common mode interference signal that capacitor C Y11, CY12, CY21 and CY22 produce the switching frequency of DC power supply DC-DC module 6 ground of releasing to a certain extent.
The common code impedance (solid line) that two curves shown in Figure 8 are respectively common mode inhibition device CM1 and the curve chart of differential mode impedance (dotted line), as can be seen from the figure the mode impedance value of common mode inhibition device CM1 is 10 times of differential mode resistance value substantially, therefore this common mode inhibition device CM1 presents very big induction reactance inhibitory action for the common mode interference signal of the switching frequency generation of DC power supply DC-DC module 6, makes it to be difficult for passing through; And it is very little to the decay of useful difference mode signal.The inductance value of common mode inhibition device CM1 depends on the frequency of the interference signal of wanting filtering, and frequency is low more, and the inductance value that needs is big more.The mode impedance value of common mode inhibition device CM1 is selected also can determine according to the interference signal frequency of want filtering.
Embodiment two
The utility model embodiment provides another kind of PoE Ethernet switch, this PoE Ethernet switch also also is serially connected with a filter circuit 9 except access filter circuit 7 between DC power supply DC-DC module 6 and the Power over Ethernet control module 8 between Power over Ethernet control module 8 and ethernet port module 4 (the ethernet port module of only drawing among the figure).
The structural similarity of the structure of filter circuit 9 and filter circuit 7, as shown in figure 11: between the power positive cathode line of the power positive cathode line of Power over Ethernet control module 8 outputs and ethernet port module 4 inputs, be connected with a common mode inhibition device CM2; Between positive source line 901 between Power over Ethernet control module 8 and the common mode inhibitor CM2 and power-polar curve 902, be connected with a capacitor C X3, between power-polar curve 902 and ground, be connected with a capacitor C Y31, between positive source line 901 and ground, be connected with a capacitor C Y32; Between positive source line 903 between common mode inhibition device CM2 and the ethernet port module 4 and power-polar curve 904, be connected with a capacitor C X4, and between power-polar curve 904 and ground, be connected with a capacitor C Y41, between positive source line 903 and ground, be connected with a capacitor C Y42.With embodiment one in like manner, any one or a plurality of electric capacity with a plurality of parallel connections among capacitor C X3, CY31, CY32, CX4, CY41 and the CY42 can be replaced.The structure of common mode inhibition device CM2 can be as shown in Figure 7.
Because common mode inhibition device CM1 is positioned at total output of DC power supply DC-DC module 6, rated current is bigger, therefore require the line footpath of coiling of common mode inhibition device CM1 thicker, and common mode inhibition device CM2 is positioned at each ethernet port module side, rated current is less, therefore, the coiling of common mode inhibition device CM2 can be with the line footpath than fine rule.Capacitor C X1 in the filter circuit 7, CX2 and capacitor C Y11, CY12, CY21, CY22 can select the 0.47uF/100V ceramic condenser for use; The capacitor C X3 of filter circuit 9, CX4 and capacitor C Y31, CY32, CY41, CY42 can select the 0.1uF/100V ceramic condenser for use.
The π type filter circuit that capacitor C X3 and CX4 and common mode inhibitor CM2 form can filter out the common mode interference signal that DC power supply DC-DC module 6 produces, thereby reduction electromagnetic radiation, and the common mode interference signal that capacitor C Y31, CY32, CY41 and CY42 cause the DC power supply switch frequency ground of directly releasing filters out the part or all of common mode interference signal that DC power supply DC-DC module 6 produces like this.
The utility model embodiment two is connected in series filter circuit 9 by between the Power over Ethernet control module 8 in embodiment one and the ethernet port module 4, the electromagnetic interference that can further produce DC power supply DC-DC module 6 is carried out filtering, thereby further reduces the influence of the electromagnetic interference of power supply unit generation to other equipment.
Conducted Electromagnetic Interference to one of them ethernet port module of the Ethernet switch among the utility model embodiment two is tested, test result as shown in Figure 9, Conducted Electromagnetic Interference maximum at frequency 150kHz place, be 27dBuA, and standard code (thick line among Fig. 9 is a standard code Conducted Electromagnetic limit value) is 40dBuA at the limit value of the Conducted Electromagnetic Interference of frequency 150kHz, hence one can see that, and the Conducted Electromagnetic Interference of the PoE Ethernet switch that the utility model provides is than the low 13dBuA of limit value of regulation.The PoE Ethernet switch is carried out the complete machine radiation test, test result as shown in figure 10, as can be seen from the figure the complete machine radiation of the PoE Ethernet switch that provides among the utility model embodiment also is lower than the radiation limit value of standard code (thick line among Figure 10 is standard code radiation limit value).With Fig. 9 and Fig. 3 contrast, Figure 10 and Fig. 4 contrast, the electromagnetic interference of PoE power supply unit obtains the inhibition of significant effective ground as can be seen, all is lower than the limit value of correlation standard in whole frequency.
Embodiment three
The utility model provides the power receiving equipment in a kind of Power over Ethernet system, to reduce the problem that power receiving equipment in the Power over Ethernet system is subjected to the electromagnetic interference that the power supply unit to its power supply produces.
This embodiment comes the electromagnetic interference that power supply unit produced of filtering to this power receiving equipment power supply at the inner filter circuit 11 that increases of power receiving equipment, as the electromagnetic interference of PoE Ethernet switch generation.Figure 12 has provided the circuit diagram of the power receiving equipment that has increased filter circuit 11, is connected with a filter circuit 11 between the ethernet port module 13 of power receiving equipment inside and operating circuit module 12.
As shown in figure 12, the structure of filter circuit 11 is: be serially connected with common mode inhibition device CM3 between the power positive cathode line of the power positive cathode line of ethernet port module 13 outputs and operating circuit module 12 inputs, between the positive source line 121 of ethernet port module 13 and common mode inhibitor CM3 and power-polar curve 122, be connected with a capacitor C X5, between positive source line 121 and ground, be connected with a capacitor C Y52, between power-polar curve 122 and ground, be connected with a capacitor C Y51; Between positive source line 123 between common mode inhibition device CM3 and the operating circuit module 12 and power-polar curve 124, be connected with a capacitor C X6, between positive source line 123 and ground, be connected with a capacitor C Y62, between power-polar curve 124 and ground, be connected with a capacitor C Y61.With embodiment one, embodiment two in like manner, any one or a plurality of electric capacity with a plurality of parallel connections among capacitor C X5, CY51, CY52, CX6, CY61 and the CY62 can be replaced.The structure of common mode inhibition device CM3 can be as shown in Figure 7.
The utility model embodiment three is connected in series a filter circuit between the operating circuit module 12 of power receiving equipment and ethernet port module 13, part or all of noise that the power supply unit that this filter circuit will send by the Ethernet cable produces and common mode interference signal are considered and are removed, and so just make that power receiving equipment is subjected to reducing to the electromagnetic interference effect of the power supply unit of its power supply.
The operating circuit module 12 of the power receiving equipment among the utility model embodiment three can be linked into its inside by the direct current that the pin of isolating transformer 10 is carried power supply unit.
Power over Ethernet control module 8 in the above embodiments one, embodiment two is transported to ethernet port module 4 with two pins of direct current by isolating transformer 3, with this direct current is injected into the Ethernet cable; Ethernet port module 13 among the embodiment three is transported to operating circuit module 12 with the direct current that receives two pins by isolating transformer 10; And the DC power supply DC-DC module 6 of the DC-DC of the PoE Ethernet switch among embodiment one and the embodiment two (output of direct current input direct current) pattern can be with the power supply replacement of AC-DC (exchanging the input direct current exports) pattern.
Can pass through EDA (Electronic Design Automation among the embodiment that the utility model provides, electric design automation) instrument carries out circuit simulation and common mode inhibition device, the electric capacity of selecting the suitable parameters characteristic is debugged in actual measurement, suppresses effect to reach best electromagnetism.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (10)
1, the power supply unit in a kind of Power over Ethernet system, comprise: power module, the Power over Ethernet control module that is connected with power module, the ethernet port module that is connected with the Power over Ethernet control module, it is characterized in that, between power module and Power over Ethernet control module, also be serially connected with the first common mode filtering circuit module.
2, power supply unit as claimed in claim 1, it is characterized in that, the described first common mode filtering circuit module comprises: the first common mode inhibition device, the power positive cathode line of one end is connected with the power positive cathode line of power module outlet, and the power positive cathode line of the other end is connected with the power positive cathode line of Power over Ethernet control module input; Between the power positive cathode line of the described first common mode inhibition device, one end and between the power positive cathode line of the other end, be connected with an electric capacity or a capacitance group separately, each electric capacity in the described capacitance group is connected in parallel between the power positive cathode line; By electric capacity or capacitance group ground connection, each electric capacity in the described appearance group is connected in parallel between corresponding power supply polar curve and the ground power positive cathode line at the described first common mode inhibition device two ends respectively.
3, power supply unit as claimed in claim 2, it is characterized in that, the described first common mode inhibition device comprises magnet ring and first coil and second coil on this magnet ring, the two ends of described first coil connect the positive source line of power module outlet and the positive source line of Power over Ethernet control module input respectively, and the two ends of described second coil connect the power-polar curve of power module outlet and the power-polar curve of Power over Ethernet control module input respectively.
4 as claim 1 or 2 or 3 described power supply units, it is characterized in that, also are serially connected with the second common mode filtering circuit module between Power over Ethernet control module and ethernet port module.
5, power supply unit as claimed in claim 4, it is characterized in that, the described second common mode filtering circuit module comprises: the second common mode inhibition device, the power positive cathode line of one end is connected with the power positive cathode line of Power over Ethernet control module output, and the power positive cathode line of the other end is connected with the power positive cathode line of ethernet port module input; Between the power positive cathode line of the described second common mode inhibition device, one end and between the power positive cathode line of the other end, be connected with an electric capacity or a capacitance group separately, each electric capacity in the described capacitance group is connected in parallel between the power positive cathode line; By electric capacity or capacitance group ground connection, each electric capacity in the described appearance group is connected in parallel between corresponding power supply polar curve and the ground power positive cathode line at the described second common mode inhibition device two ends respectively.
6, power supply unit as claimed in claim 5, it is characterized in that, the described second common mode inhibition device comprises magnet ring and tertiary coil and the 4th coil on this magnet ring, the two ends of described tertiary coil connect the positive source line of Power over Ethernet control module output and the positive source line of ethernet port module input respectively, and the two ends of described the 4th coil connect the power-polar curve of Power over Ethernet control module output and the power-polar curve of ethernet port module input respectively.
7 power supply units as claimed in claim 5 is characterized in that, the line of the coil of the described first common mode inhibition device is directly thick than the line footpath of the coil of the second common mode inhibition device.
8, the power receiving equipment in a kind of Power over Ethernet system comprises the ethernet port module, and the operating circuit module that is connected with the ethernet port module is characterized in that, is serially connected with the common mode filtering circuit module between ethernet port module and operating circuit module.
9, power receiving equipment as claimed in claim 8, it is characterized in that, described common mode filtering circuit module comprises: the common mode inhibition device, the power positive cathode line of one end is connected with the power positive cathode line of ethernet port module output, and the power positive cathode line of the other end is connected with the power positive cathode line of operating circuit module input; Between the power positive cathode line of described common mode inhibition device one end and between the power positive cathode line of the other end, be connected with an electric capacity or a capacitance group separately, each electric capacity in the described capacitance group is connected in parallel between the power positive cathode line; By electric capacity or capacitance group ground connection, each electric capacity in the described appearance group is connected in parallel between corresponding power supply polar curve and the ground power positive cathode line at the described second common mode inhibition device two ends respectively.
10, power receiving equipment as claimed in claim 9, it is characterized in that, described common mode inhibition device comprises magnet ring and first coil and second coil on this magnet ring, the two ends of described first coil connect the positive source line of ethernet port module output and the positive source line of operating circuit module input respectively, and the two ends of described second coil connect the power-polar curve of ethernet port module output and the power-polar curve of Power over Ethernet control module input respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201233526U CN201294537Y (en) | 2008-11-03 | 2008-11-03 | Power receiving equipment and electric power system of Ethernet electric power system |
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| CNU2008201233526U CN201294537Y (en) | 2008-11-03 | 2008-11-03 | Power receiving equipment and electric power system of Ethernet electric power system |
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