CN105187096A - Power line carrier signal coupling circuit - Google Patents

Power line carrier signal coupling circuit Download PDF

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Publication number
CN105187096A
CN105187096A CN201510547743.5A CN201510547743A CN105187096A CN 105187096 A CN105187096 A CN 105187096A CN 201510547743 A CN201510547743 A CN 201510547743A CN 105187096 A CN105187096 A CN 105187096A
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CN
China
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described
end
connected
power carrier
circuit
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CN201510547743.5A
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Chinese (zh)
Inventor
俞伟
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浙江方大智控科技有限公司
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Priority to CN201510547743.5A priority Critical patent/CN105187096A/en
Publication of CN105187096A publication Critical patent/CN105187096A/en

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Abstract

The invention discloses a power line carrier signal coupling circuit which comprises a first power line carrier coupling channel and a second power line carrier coupling channel. The first power line carrier coupling channel is arranged between the live line and the null line of an AC cable, and receives and sends a first carrier signal between the live line and null line of the AC cable; and the second power line carrier coupling channel is arranged between the grounding line and the null line of the AC cable and receives and sends a second carrier signal between the grounding line and the null line of the AC cable. The power line carrier signal coupling circuit can prevent the problem that information cannot be transmitted due to interference during single-channel data transmission. Meanwhile, only one power line carrier coupling channel needs to be added to the circuit, and multichannel carrier coupling can be realized; and the existing circuit has small transformation, and low cost is realized.

Description

Power carrier signal coupling circuit

Technical field

The invention belongs to power carrier communication technical field, be specifically related to a kind of power carrier signal coupling circuit.

Background technology

The abundant user resources that power carrier (PowerLineCarrier, PLC) communication has because of power distribution network and economic benefit and become the first-selected communication mode of power system communication net.For this reason, power line carrier, PLC standard has all been formulated in the US and European world, meanwhile, our national grid has also formulated the electric power electricity consumption user profile acquisition system communication unit technology specification of low pressure carrier wave signal 3kHz ~ 500kHz, and these standards facilitate the fast development of electric power carrier communication technology.

But low-voltage power line be input impedance change greatly, complicated, the multiple noise of attenuation characteristic depositing and the strong wire message way of noise time variation, due to this inherent characteristics of low-voltage power line, cause being no matter that the development of low pressure broadband P LC or low pressure arrowband PLC is all not fully up to expectations.

Say from technical standpoint, utilize power line as transmission medium, mainly there is following unfavorable factor:

1) impulsive noise (ImpulseNoise): be noise source maximum on power line.As: washing machine, air conditioner motor and fluorescent lamp start and stop moment.Noise has the wide feature of sudden change, high energy and covering frequence scope, very large on carrier signal impact.Signal error rate not only can be caused to raise, and receiving equipment inside may be made to produce self-interference, have a strong impact on the work of whole system.

2) signal attenuation and impedance variation: because household electrical appliance start and stop randomness causes greatly, as: refrigerator, easily cause electrical load change large, make power line impedance can change to 100 ohm from 0.1 ohm, signal attenuation is from 55dB to 100dB.

3) humorous wave interference (CW, Continuous-Wavejamming) is continued: as: Switching Power Supply, the main harmonic frequency of generation, at more than 50kHz, is in the frequency range of carrier signal.

Therefore, for electric power carrier communication technology, most important is exactly the carrier wave coupling technique improving power line.

Summary of the invention

For the above-mentioned technological deficiency existing for prior art, the invention provides a kind of power carrier signal coupling filter circuit, when well can avoid single channel transmission data, because of interference, cause cannot the problem of transmission information.

A kind of power carrier signal coupling circuit, comprising: the first power carrier coupling channel, the second power carrier coupling channel;

Described first power carrier coupling channel is arranged between the live wire of ac cable and zero line, receives and send first carrier signal between the live wire and zero line of ac cable;

Described second power carrier coupling channel is arranged between the ground wire of ac cable and zero line, receives and send the second carrier signal between the ground wire and zero line of ac cable.

Optionally, also comprise filter circuit, power carrier treatment circuit and carrier power amplifier circuit, described first power carrier coupling channel, the second power carrier coupling channel is in parallel and be connected with one end of described filter circuit, the other end of described filter circuit is connected with the input of power carrier treatment circuit, the output of described power carrier treatment circuit is connected with the input of carrier power amplifier circuit, and the output of described carrier power amplifier circuit is connected with described first power carrier coupling channel, the second power carrier coupling channel respectively.

Optionally, described first power carrier coupling channel comprises the first inductance, first electric capacity and the first coupling transformer, described first inductance with the first capacitances in series and one end be connected with live wire, the other end is connected with the first coupling transformer, the side of described first coupling transformer is connected with zero line with live wire respectively, and output, the filter circuit of opposite side and carrier power amplifier circuit are connected.

Optionally, described second power carrier coupling channel comprises the second inductance, second electric capacity and the second coupling transformer, described second inductance with the second capacitances in series and one end be connected with ground wire, the other end is connected with the second coupling transformer, the side of described second coupling transformer is connected with zero line with ground wire respectively, and output, the filter circuit of opposite side and carrier power amplifier circuit are connected.

Optionally, described first coupling transformer, the second coupling transformer adopt triple insulated wire two-wire and rich mode coiling.

Optionally, described filter circuit comprises high resistant low-resistance three rank filter, described high resistant low-resistance three rank filter comprises: the 4th electric capacity in parallel and the 4th inductance, 5th electric capacity in parallel and the 5th inductance, 6th electric capacity in parallel and the 6th inductance, 7th electric capacity and the 8th electric capacity, 5th electric capacity of described parallel connection is connected with earth terminal with the 5th inductance one end, one end of one end and the 4th electric capacity in parallel and the 4th inductance, one end of 8th electric capacity is connected, one end of described 7th electric capacity is connected with coupling channel, the other end of described 7th electric capacity is connected with the other end of the 4th inductance with the 4th electric capacity of parallel connection, the other end of described 8th electric capacity is connected with one end of the 6th inductance with the 6th electric capacity of parallel connection.

Optionally, described filter circuit also comprises attenuator, described attenuator comprises the first resistance, the second resistance, the first switching tube and control signal end, one end ground connection of described first resistance, the other end of described first resistance is connected with the control of control signal end, the first switching tube, one end ground connection of described first switching tube, the other end is connected with one end of the second resistance, and the other end of described second resistance connects power carrier treatment circuit.

Optionally, described filter circuit also comprises amplitude limiter circuit, and described amplitude limiter circuit comprises the contrary and diode of parallel connection of both direction, one end ground connection of the diode of described parallel connection, another termination power carrier treatment circuit.

Compared with prior art, the present invention at least has following technique effect:

Because existing Noise and Interference is mainly between live wire and zero line, high-frequency interferencing signal is relatively more serious, couples a signal on zero line and ground wire, because do not have voltage between zero line and ground wire or do not have High-frequency Interference, comparatively speaking, do not have the interference signal between live wire and zero line large.Power carrier signal is after carrier power amplifier circuit sends, power carrier signal is coupled to the first power carrier coupling channel simultaneously, in second power carrier coupling channel two passage, if the interference signal between live wire and zero line is larger, so power carrier signal can by the channel transfer of zero line and ground wire in next equipment, have received the coupled signal of two passages in next equipment simultaneously, as long as there is a passage capable of being normally to receive signal, so communication will go on, when well avoiding single channel transmission data, because of interference, cause cannot the problem of transmission information.Meanwhile, as long as this circuit increases by a road power carrier coupling channel, namely can realize multichannel carrier coupling, little to the transformation of available circuit, cost is little.

Accompanying drawing explanation

Fig. 1 is the structural representation of the power carrier signal coupling circuit of the embodiment of the present invention.

Embodiment

In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, technical scheme of the present invention and operation principle thereof are described in detail.

Please refer to Fig. 1, be the electrical block diagram of the power carrier signal coupling circuit of the embodiment of the present invention, specifically comprise:

First power carrier coupling channel 10, second power carrier coupling channel 20, filter circuit 30, power carrier treatment circuit 40 and carrier power amplifier circuit 50,

Described first power carrier coupling channel 10 is arranged between the live wire AC_L of ac cable and zero line AC_N, receives and send first carrier signal between the live wire AC_L and zero line AC_N of ac cable;

Described second power carrier coupling channel 20 is arranged between the ground wire AC_PE of ac cable and zero line AC_N, receives and send the second carrier signal between the ground wire AC_PE and zero line AC_N of ac cable.

Because existing Noise and Interference is mainly between live wire and zero line, high-frequency interferencing signal is relatively more serious, couples a signal on zero line and ground wire, because do not have voltage between zero line and ground wire or do not have High-frequency Interference, comparatively speaking, do not have the interference signal between live wire and zero line large.Power carrier signal is after carrier power amplifier circuit sends, power carrier signal is coupled to the first power carrier coupling channel 10 simultaneously, in second power carrier coupling channel 20 two passage, if the interference signal between live wire and zero line is larger, so power carrier signal can by the channel transfer of zero line and ground wire in next equipment, have received the coupled signal of two passages in next equipment simultaneously, as long as there is a passage capable of being normally to receive signal, so communication will go on, when well avoiding single channel transmission data, because of interference, cause cannot the problem of transmission information.Meanwhile, as long as this circuit increases by a road power carrier coupling channel, namely can realize multichannel carrier coupling, little to the transformation of available circuit, cost is little.

Simultaneously because two passages can signal transmission, also transfer of data can be carried out at direct current or when there is no voltage between ground wire AC_PE and zero line AC_N, just can only can carry out transfer of data when having alternating current with existing, expanding practicality.

In the present embodiment, described first power carrier coupling channel 10 comprises the first inductance L 1, first electric capacity C1 and the first coupling transformer T1, described first inductance L 1 is connected with the first electric capacity C1 and one end is connected with live wire AC_L, the other end is connected with the first coupling transformer T1, the side of described first coupling transformer T1 is connected with zero line AC_N with live wire AC_L respectively, and output, the filter circuit 30 of opposite side and carrier power amplifier circuit 50 are connected.

In the present embodiment, described second power carrier coupling channel 20 comprises the second inductance L 2, second electric capacity C2 and the second coupling transformer T2, described second inductance L 2 is connected with the second electric capacity C2 and one end is connected with ground wire AC_PE, the other end is connected with the second coupling transformer T2, the side of described second coupling transformer T2 is connected with zero line AC_N with ground wire AC_PE respectively, and output, the filter circuit 30 of opposite side and carrier power amplifier circuit 50 are connected.

Coupled modes of the present invention can carry out high-low pressure isolation, and dielectric voltage withstand can reach 4KV.Have employed triple insulated wire two-wire and rich mode simultaneously.Because the present invention is 1:1 coupling, noise or interference can not be amplified, utilize triple insulated wire to carry out two-wire simultaneously and have mercy on, compare traditional independent winding mode, can interference be reduced, ensure that signal is undistorted.

In the present embodiment, described first power carrier coupling channel 10, second power carrier coupling channel 20 is in parallel and be connected with one end of described filter circuit 30, the other end of described filter circuit 30 is connected with the input of power carrier treatment circuit 40, the output of described power carrier treatment circuit 40 is connected with the input of carrier power amplifier circuit 50, and the output of described carrier power amplifier circuit 50 is connected with described first power carrier coupling channel 10, second power carrier coupling channel 20 respectively.

In the present embodiment, described filter circuit comprises high resistant low-resistance three rank filter, attenuator and amplitude limiter circuit, described high resistant low-resistance three rank filter comprises: the 4th electric capacity C4 in parallel and the 4th inductance L 4, 5th electric capacity C4 in parallel and the 5th inductance L 5, 6th electric capacity C6 in parallel and the 6th inductance L 6, 7th electric capacity C7 and the 8th electric capacity C8, 5th electric capacity C4 of described parallel connection is connected with earth terminal with the 5th inductance L 5 one end, one end of the other end and the 4th electric capacity C4 in parallel and the 4th inductance L 4, one end of 8th electric capacity C8 is connected, one end of described 7th electric capacity C7 is connected with coupling channel, the other end of described 7th electric capacity C7 is connected with the other end of the 4th inductance L 4 with the 4th electric capacity C4 of parallel connection, the other end of described 8th electric capacity C8 is connected with one end of the 6th inductance L 6 with the 6th electric capacity C6 of parallel connection.The present embodiment adopts three T-shaped rank filters to carry out filtering, and bandwidth ratio is wider, and filter effect is better, in other embodiments, also can adopt traditional π type filtering.

In the present embodiment, described 4th inductance L 4 is in parallel with the 4th electric capacity C4, and the 6th inductance L 6 is in parallel with the 6th electric capacity C6, has intercepted the high frequency waves of more than 140K; 5th inductance L 5 is in parallel with the 5th electric capacity C5, has intercepted the high frequency waves of below 120K, thus achieves the filtering of high resistant low-resistance.

Described attenuator comprises the first resistance R1, the second resistance R2, the first switching tube Q1 and control signal end CAGC, one end ground connection of described first resistance R1, the other end of described first resistance R1 is connected with the control of control signal end CAGC, the first switching tube Q1, one end ground connection of described first switching tube Q1, the other end is connected with one end of the second resistance R2, and the other end of described second resistance R2 connects power carrier treatment circuit 40.Power carrier signal can be passed through this circuit decay 60db, with the interference signal that decays by attenuator.

Described amplitude limiter circuit comprises contrary and diode D1 and D2 of parallel connection of both direction, one end ground connection of the diode of described parallel connection, another termination power carrier treatment circuit.Conducting voltage due to diode is 0.7V, by carrier signal amplitude limit within 0.7V, in order to avoid signal is excessive burn carrier chip.

The above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the embodiment of the present invention.

Claims (8)

1. a power carrier signal coupling circuit, is characterized in that, comprising: the first power carrier coupling channel, the second power carrier coupling channel;
Described first power carrier coupling channel is arranged between the live wire of ac cable and zero line, receives and send first carrier signal between the live wire and zero line of ac cable;
Described second power carrier coupling channel is arranged between the ground wire of ac cable and zero line, receives and send the second carrier signal between the ground wire and zero line of ac cable.
2. power carrier signal coupling circuit according to claim 1, it is characterized in that, also comprise filter circuit, power carrier treatment circuit and carrier power amplifier circuit, described first power carrier coupling channel, second power carrier coupling channel is in parallel and be connected with one end of described filter circuit, the other end of described filter circuit is connected with the input of power carrier treatment circuit, the output of described power carrier treatment circuit is connected with the input of carrier power amplifier circuit, the output of described carrier power amplifier circuit respectively with described first power carrier coupling channel, second power carrier coupling channel is connected.
3. power carrier signal coupling circuit according to claim 2, it is characterized in that, described first power carrier coupling channel comprises the first inductance, first electric capacity and the first coupling transformer, described first inductance with the first capacitances in series and one end be connected with live wire, the other end is connected with the first coupling transformer, and the side of described first coupling transformer is connected with zero line with live wire respectively, and output, the filter circuit of opposite side and carrier power amplifier circuit are connected.
4. power carrier signal coupling circuit according to claim 2, it is characterized in that, described second power carrier coupling channel comprises the second inductance, second electric capacity and the second coupling transformer, described second inductance with the second capacitances in series and one end be connected with ground wire, the other end is connected with the second coupling transformer, and the side of described second coupling transformer is connected with zero line with ground wire respectively, and output, the filter circuit of opposite side and carrier power amplifier circuit are connected.
5. the power carrier signal coupling circuit according to claim 3 or 4, described first coupling transformer, the second coupling transformer adopt triple insulated wire two-wire and rich mode coiling.
6. power carrier signal coupling circuit according to claim 1, it is characterized in that, described filter circuit comprises high resistant low-resistance three rank filter, described high resistant low-resistance three rank filter comprises: the 4th electric capacity in parallel and the 4th inductance, 5th electric capacity in parallel and the 5th inductance, 6th electric capacity in parallel and the 6th inductance, 7th electric capacity and the 8th electric capacity, 5th electric capacity of described parallel connection is connected with earth terminal with the 5th inductance one end, one end of one end and the 4th electric capacity in parallel and the 4th inductance, one end of 8th electric capacity is connected, one end of described 7th electric capacity is connected with coupling channel, the other end of described 7th electric capacity is connected with the other end of the 4th inductance with the 4th electric capacity of parallel connection, the other end of described 8th electric capacity is connected with one end of the 6th inductance with the 6th electric capacity of parallel connection.
7. power carrier signal coupling circuit according to claim 6, it is characterized in that, described filter circuit also comprises attenuator, described attenuator comprises the first resistance, the second resistance, the first switching tube and control signal end, one end ground connection of described first resistance, the other end of described first resistance is connected with the control of control signal end, the first switching tube, one end ground connection of described first switching tube, the other end is connected with one end of the second resistance, and the other end of described second resistance connects power carrier treatment circuit.
8. power carrier signal coupling circuit according to claim 6, it is characterized in that, described filter circuit also comprises amplitude limiter circuit, and described amplitude limiter circuit comprises the contrary and diode of parallel connection of both direction, one end ground connection of the diode of described parallel connection, another termination power carrier treatment circuit.
CN201510547743.5A 2015-08-31 2015-08-31 Power line carrier signal coupling circuit CN105187096A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106301476A (en) * 2016-09-28 2017-01-04 浙江方大智控科技有限公司 A kind of carrier signal coupling circuit and carrier module
CN106374978A (en) * 2016-08-29 2017-02-01 阳光电源股份有限公司 Power carrier signal coupling circuit and communication system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030006881A1 (en) * 2000-04-12 2003-01-09 Reyes Ronald R. System and method for power line communication
CN1537365A (en) * 2001-03-29 2004-10-13 埃姆别特公司 Coupling circuit for power line communications
CN102075216A (en) * 2011-01-18 2011-05-25 西安新视科技有限公司 System for isolating and coupling power line communication signals
CN102594410A (en) * 2012-03-07 2012-07-18 深圳市共进电子股份有限公司 Power line communication equipment based on smartlink technology and communication method thereof
CN204886948U (en) * 2015-08-31 2015-12-16 浙江方大智控科技有限公司 Power line carrier signals interconnected circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030006881A1 (en) * 2000-04-12 2003-01-09 Reyes Ronald R. System and method for power line communication
CN1537365A (en) * 2001-03-29 2004-10-13 埃姆别特公司 Coupling circuit for power line communications
CN102075216A (en) * 2011-01-18 2011-05-25 西安新视科技有限公司 System for isolating and coupling power line communication signals
CN102594410A (en) * 2012-03-07 2012-07-18 深圳市共进电子股份有限公司 Power line communication equipment based on smartlink technology and communication method thereof
CN204886948U (en) * 2015-08-31 2015-12-16 浙江方大智控科技有限公司 Power line carrier signals interconnected circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106374978A (en) * 2016-08-29 2017-02-01 阳光电源股份有限公司 Power carrier signal coupling circuit and communication system
CN106301476A (en) * 2016-09-28 2017-01-04 浙江方大智控科技有限公司 A kind of carrier signal coupling circuit and carrier module
CN106301476B (en) * 2016-09-28 2019-01-15 浙江方大智控科技有限公司 A kind of carrier signal coupling circuit and carrier module

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Application publication date: 20151223