A kind of Homeplug equipment
Technical field
The present invention relates to the power communication field, particularly a kind of Homeplug equipment.
Background technology
Homeplug has another name called the electric power networks bridger, is a kind of network signal to be modulated on the electric wire, utilizes existing electric wire to solve the equipment of network layout problem.At present, Homeplug is as the third generation networks transmission equipment, and the high speed that not only has netting twine is stable, and also to possess the movement of wireless network convenient.
In Technology of Power Line Communication, Homeplug is used very extensive, it utilizes electric wire to transmit high-frequency signal, the high-frequency signal of carrying information is loaded on the electric current, then transmit with electric wire, the modulator-demodulator of reception information out and is sent to high-frequency signal " decomposition " from electric current on computer or the phone again, thereby realizes online, makes a phone call and watch IPTV on the basis that is not needing rewiring, use the multiple application such as video monitoring equipment.
Present Homeplug equipment is Direct Plug-In substantially, and alternating current 220V directly inputs, and perhaps civil power is directly inputted desktop type Homeplug equipment.
As shown in Figure 1, a kind of zero cross detection circuit of Homeplug power-supply device of prior art, electric-power wire communication signal and power supply three tunnel outputs are independently, and it exports 5 lines.Two is the Homeplug signal of communication, and one is the zero passage detection signal, and other two are respectively VDD-to-VSS.There are the following problems for the Homeplug power-supply device of prior art: slotting wall equipment can only be placed and insert the wall position, can't move, and is dumb; If lengthen the desktop type Homeplug of AC power cord, then have the danger of high-tension electricity; Adopt the Homeplug of separate power supply to have fail safe, can suitably move, but five core power connections are complicated, single core interface that can't be general, cost is high.And cabling is long, and power supply and holding wire intercouple, and disturbs excessive.Therefore, can be with five road signal couplings of Homeplug power supply on DC power supply.
Yet how restoring 5 road signals from DC power supply is current technical issues that need to address.
Summary of the invention
In order to solve the problems referred to above of prior art, be necessary to provide a kind of Homeplug equipment that is suitable for the low-voltage dc power supply power supply.
The technical scheme that technical solution problem of the present invention provides is:
A kind of Homeplug equipment, it comprises dc power anode input, dc power cathode input, signal coupling circuit, electric source filter circuit, zero cross signal split circuit, power line communication treatment circuit; Two inputs of signal coupling circuit are connected with the dc power cathode input with the dc power anode input respectively, and two outputs are connected to respectively the power line communication treatment circuit; Two inputs of electric source filter circuit are connected with the dc power cathode input with the dc power anode input respectively, and two outputs are connected to respectively the power line communication treatment circuit; One end of zero cross signal split circuit is connected with the dc power anode input, and the other end is connected to the power line communication treatment circuit.
Wherein, signal coupling circuit comprises communications transformer T1, capacitor C 1 and capacitor C 2, two inputs of communications transformer T1 are connected with the dc power cathode input with the dc power anode input with capacitor C 2 by capacitor C 1 respectively, and two outputs are connected to respectively the power line communication treatment circuit.。
Wherein, the zero cross signal split circuit comprises capacitor C 4.
Wherein, electric source filter circuit comprises common mode inductance T2, inductance L 1, inductance L 2, capacitor C 3 and capacitor C 5, two inputs of common mode inductance T2 are respectively by inductance L 1 and L2 and dc power anode input and dc power cathode input, capacitor C 3 is connected between two inputs of common mode inductance T2, capacitor C 5 is connected between two outputs of common mode inductance T2, and two outputs of common mode inductance T2 are connected to respectively the power line communication treatment circuit.
Wherein, the zero cross signal split circuit is connected with the dc power anode input by inductance L 1.
Wherein, dc power anode input and dc power cathode input are connected to respectively positive pole and the negative pole of external direct current power supply by coaxial cable.
Wherein, the power line communication treatment circuit is used for five road signals are processed, and generates the signal that external equipment can be identified.
Wherein, described Homeplug equipment also comprises an Ethernet interface that is connected with the power line communication treatment circuit.
Compared with prior art, the present invention has realized being suitable for the Homeplug equipment of low-voltage dc power supply power supply, by independent Homeplug power supply, for providing the power line communication of safe low pressure, the user uses, providing and separation equipment of colleague's direct current, also for doing of other equipment and Homeplug the expansion of using, make the mode of power line communication more versatile and flexible.
Description of drawings
Fig. 1 is the circuit theory diagrams of the Homeplug power-supply device of prior art.
Fig. 2 is the circuit theory diagrams of Homeplug equipment of the present invention.
Embodiment
As shown in Figure 2, be the circuit theory diagrams of Homeplug equipment of the present invention, it comprises dc power anode input, dc power cathode input, signal coupling circuit, electric source filter circuit, zero cross signal split circuit, power line communication treatment circuit and Ethernet interface.Signal coupling circuit comprises communications transformer T1, capacitor C 1 and capacitor C 2.Electric source filter circuit comprises common mode inductance T2, inductance L 1, inductance L 2, capacitor C 3 and capacitor C 5.The zero cross signal split circuit comprises capacitor C 4.
Dc power anode input and dc power cathode input are connected to respectively positive pole and the negative pole of external direct current power supply by coaxial cable.Two inputs of signal coupling circuit are connected with the dc power cathode input with the dc power anode input respectively, it is used for being coupled out two-way plc communication signal from the external dc power signal, and by two outputs two-way plc communication signal is sent to the power line communication treatment circuit.Two inputs of electric source filter circuit are connected with the dc power cathode input with the dc power anode input respectively, it is used for isolating power supply signal from the external dc power signal, and by two outputs this power supply signal is sent to the power line communication treatment circuit, give the power supply of power line communication treatment circuit.One end of zero cross signal split circuit is connected with the dc power anode input by inductance L 1, the other end is connected to the power line communication treatment circuit, it is used for isolating the zero passage detection signal from the external dc power signal, and zero cross signal is sent to the power line communication treatment circuit.The power line communication treatment circuit receives zero passage detection signal and two-way plc communication signal, generates ethernet signal and is sent to Ethernet interface.
Two inputs of communications transformer T1 are connected with the dc power cathode input with the dc power anode input with capacitor C 2 by capacitor C 1 respectively, and two outputs are connected to respectively the power line communication treatment circuit.Two inputs of common mode inductance T2 are respectively by inductance L 1 and L2 and dc power anode input and dc power cathode input, capacitor C 3 is connected between two inputs of common mode inductance T2, capacitor C 5 is connected between two outputs of common mode inductance T2, and two outputs of common mode inductance T2 are connected to respectively the power line communication treatment circuit.Capacitor C 4 is for separating of the zero passage detection signal, and zero cross signal at first passes through the filtering of L1 inductance, and isolation high-frequency communication signal (more than the 2MHZ) is then separated by capacitor C 4.Communications transformer T1 is used for providing the coupling path of electric-power wire communication signal.When capacitor C 1 and capacitor C 2 provide coupling path, the isolated DC input power.Common mode inductance T2, capacitor C 3, capacitor C 5, inductance L 1 and inductance L 2 consist of low pass filter together, and the isolation high-frequency communication signal provides clean power supply to be given to the power line communication treatment circuit.
Signal coupling circuit will be coupled in the external direct current power supply signal extraction of two-way plc communication out, the zero cross signal that the zero cross signal split circuit will be coupled in the external direct current power supply is separated, the power supply signal that electric source filter circuit just is coupled in the external direct current power supply restores, thereby realized the five road signals reduction of Homeplug equipment to outside DC power supply, and offer the power line communication treatment circuit, generate ethernet signal by the power line communication treatment circuit.
Compared with prior art, the present invention has realized being suitable for the Homeplug equipment of low-voltage dc power supply power supply, by independent Homeplug power supply, for providing the power line communication of safe low pressure, the user uses, providing and separation equipment of colleague's direct current, also for doing of other equipment and Homeplug the expansion of using, make the mode of power line communication more versatile and flexible.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.