CN102158258A - Circuit and method for sending power line carrier (PLC) signals - Google Patents
Circuit and method for sending power line carrier (PLC) signals Download PDFInfo
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- CN102158258A CN102158258A CN2011101064717A CN201110106471A CN102158258A CN 102158258 A CN102158258 A CN 102158258A CN 2011101064717 A CN2011101064717 A CN 2011101064717A CN 201110106471 A CN201110106471 A CN 201110106471A CN 102158258 A CN102158258 A CN 102158258A
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- power line
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- carrier signal
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Abstract
The invention relates to the field of power line carrier (PLC) communication, and discloses a circuit and a method for sending power line carrier (PLC) signals. In the invention, a high-voltage MOSFET (metal-oxide-semiconductor field effect transistor) replaces an isolation transformer in the traditional PLC signal sending circuit; and a grid electrode of the MOSFET is connected with the modulated carrier signals, a source electrode of the MOSFET is grounded, and a drain electrode of the MOSFET is connected with a resonance network and a power line. The circuit and the method have the beneficial effects that available carrier signals are filtered out through the external resonance network and then are transmitted to the power line so as to avoid the isolation transformer, thus effectively preventing magnetic saturation and related risks of power amplifier damage resulting from limited power capacity of the isolation transformer, simplifying complexity of the sending circuit, and achieving the advantages of simple circuit, low application cost, small occupied area and the like.
Description
Technical field
The present invention relates to power line carrier communication, particularly the signal transmission technology in the power line carrier communication.
Background technology
Traditional power carrier signal transtation mission circuit as shown in Figure 1, wherein 100 is isolating transformer, 101 is power amplifier (PA).The carrier signal that the Vin input is modulated provides enough driving forces through linear power amplifier (PA), sends to low voltage electric network through capacitance C1, isolating transformer, coupling capacitance C2 then.
Yet owing to transformer must be wound on the magnetic core, otherwise the volume of air-core transformer can't use.But, just can't avoid magnetic saturation in case used magnetic material.The magnetization curve of magnetic device correspondence is divided into OA1 part and A1A2 part to this curve as shown in Figure 2, and OA1 represents that magnetic induction density B is approximated to the part of linear change, i.e. B=μ H with magnetic field intensity H.A1A2 represents that partly this material has entered the magnetic saturation state, and promptly along with the increase of H, magnetic induction density B the most no longer changes, μ → 0.The magnetic saturation Bmax of the magnetic core correspondence of different materials, different volumes is different, but as long as H is enough big, magnetic core finally all can enter the magnetic saturation state.Magnetic saturation Once you begin, the drive current of primary coil will increase rapidly, and magnetic core more is tending towards magnetic saturation as a result, and this is a positive feedback process, till burning out transformer or power amplifier.Usually in order to alleviate this problem, PA also needs to increase current-limiting circuit.
Therefore, present power carrier signal transtation mission circuit exists the power capacity of isolating transformer limited, easily magnetic saturation takes place, circuit devcie is many, relative complex, problem such as the higher and reliability of cost is relatively poor.
Summary of the invention
The object of the present invention is to provide a kind of power line carrier signal sending circuit and sending method, avoid the magnetic saturation problem in the power line carrier signal sending circuit, guaranteed circuit reliability.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of power line carrier signal sending circuit, comprise a metal-oxide-semiconductor and the resonant network that is used for signal is carried out filtering;
Wherein, the grid of metal-oxide-semiconductor connects modulated carrier signal, the source ground of metal-oxide-semiconductor, and the drain electrode of metal-oxide-semiconductor connects resonant network and power line.
Embodiments of the present invention also provide a kind of power line carrier signaling method, comprise following steps:
Modulated carrier signal is input to the grid of metal-oxide-semiconductor;
Utilize the resonant network that is connected with the drain electrode of metal-oxide-semiconductor that carrier signal is carried out filtering, filtered carrier signal is transferred to power line.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Use an isolating transformer in the high-voltage MOS pipe replacement conventional powerline carrier signal transtation mission circuit, the grid of metal-oxide-semiconductor connects modulated carrier signal, the source ground of metal-oxide-semiconductor, and the drain electrode of metal-oxide-semiconductor connects resonant network and power line.Owing to be to leach useful carrier signal by the external resonant network to be transferred on the power line, avoided the use of isolating transformer, thereby effectively avoided limited, magnetically saturated situation takes place easily, and the risk of relative damage power amplifier because of the power capacity of isolating transformer.And, simplified the complexity of transtation mission circuit, have advantages such as circuit is simple, application cost is low, area occupied is little.
Further, resonant network is made of an inductance and a capacitances in series, and is simple in structure, further guaranteed advantages such as power line carrier signal sending circuit application cost is low, area occupied is little.
Further, resonant network can be made of an inductance and a capacitances in series, also can be made of an inductance, a resistance and a capacitances in series, makes that implementation of the present invention is flexible and changeable.
Description of drawings
Fig. 1 is according to power line carrier signal sending circuit schematic diagram of the prior art;
Fig. 2 is the magnetization curve schematic diagram according to magnetic device correspondence of the prior art;
Fig. 3 is the power line carrier signal sending circuit schematic diagram according to first embodiment of the invention;
Fig. 4 is according to the square-wave signal schematic diagram in the first embodiment of the invention;
Fig. 5 is the corresponding spectrum diagram according to square-wave signal in the first embodiment of the invention;
Fig. 6 is according to the fsk signal schematic diagram in the first embodiment of the invention;
Fig. 7 is the corresponding spectrum diagram according to fsk signal in the first embodiment of the invention;
Fig. 8 is the BPF effect schematic diagram that plays according to single order LC series resonance network in the first embodiment of the invention;
Fig. 9 is the power line carrier signal sending circuit schematic diagram according to second embodiment of the invention;
Figure 10 is the power line carrier signaling method flow chart according to third embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
First embodiment of the invention relates to a kind of power line carrier signal sending circuit.This power line carrier signal sending circuit comprises the resonant network that filtering was managed and be used for signal is carried out to a Metal-oxide-semicondutor (MetaI-Oxide-Semiconductor is called for short " MOS ").The grid of metal-oxide-semiconductor connects modulated carrier signal, the source ground of metal-oxide-semiconductor, and the drain electrode of metal-oxide-semiconductor connects resonant network and power line.
Specifically, as shown in Figure 3, modulated carrier signal is imported from Vin, and Vin is connected on the grid of metal-oxide-semiconductor, and carrier signal is controlled the conducting of high-voltage MOS pipe as drive signal and ended.The source ground of metal-oxide-semiconductor, the resonant network that is made of an inductance L and the series connection of capacitor C is connected the drain electrode of metal-oxide-semiconductor as load, an end that is inductance connects power line, one end of the other end series capacitance of inductance, the other end of electric capacity connects the drain electrode of metal-oxide-semiconductor, resonant network carries out filtering to the carrier signal of importing from the grid of metal-oxide-semiconductor, and the useful carrier signal that leaches is transferred on the power line from Vo.Metal-oxide-semiconductor in the present embodiment is the NMOS pipe.If metal-oxide-semiconductor has substrate, the substrate ground connection of this metal-oxide-semiconductor then.
In the present embodiment, use an isolating transformer in the high-voltage MOS pipe replacement conventional powerline carrier signal transtation mission circuit, owing to be to leach useful carrier signal by the external resonant network to be transferred to the use of having avoided isolating transformer on the power line, thereby effectively avoided because of the power capacity of isolating transformer limited, magnetically saturated situation takes place easily, and the risk of relative damage power amplifier.And, simplified the complexity of transtation mission circuit, have advantages such as circuit is simple, application cost is low, area occupied is little.Be particularly useful in low voltage power line carrier (PLC) telecommunication circuit.
And resonant network is made of an inductance and a capacitances in series, and is simple in structure, further guaranteed advantages such as power line carrier signal sending circuit application cost is low, area occupied is little.
It will be understood by those skilled in the art that hypothesis need be sent to signal on the power line and be as shown in Figure 4 square-wave signal in time domain,
Its fourier series is:
Wherein, E
mThe expression amplitude, ω
1T represents the phase angle, then corresponding frequency spectrum as shown in Figure 5, the abscissa among Fig. 5 is a frequency, ordinate is an amplitude.The frequency shift keying of using always in the power line carrier communication circuit (Frequency Shift Keying is called for short " FSK ") signal is (psk signal is similar) as shown in Figure 6, and its frequency spectrum as shown in Figure 7.Because most of spectrum concentration of signal is in (f
C1-f
b)～(f
C2+ f
b), transmitting terminal needs only the signal that employing BPF (band pass filter) leaches this frequency range, wherein, and f
bThe expression bandwidth frequency, f
cExpression carrier frequency (f
C1And f
C2Represent 2 kinds of different carrier frequencies), therefore, simple single order LC series resonance network can play the effect of BPF.The BPF effect that single order LC series resonance network plays as shown in Figure 8, the abscissa among Fig. 8 is a frequency, ordinate is an amplitude-frequency response.Can find that the signal of 100kHz is decay not, other signal distance centre frequency is far away more, and amplitude fading is big more, presents bandpass characteristics.In centre frequency shown in Figure 8 is that midbandwidth is f in the single order BPF example of 100kHz
c/ Q, wherein, Q represents quality factor, suitably chooses the numerical value of L, C, just can obtain suitable Q, and then the characteristic of definite BPF.Such as the value of inductance L is 160uH, and the value of capacitor C is 16nF, just can obtain suitable Q value (Q=10 this moment).
In addition, being appreciated that in actual applications can also inductance, electric capacity is set to other values, does not give unnecessary details one by one at this.
Second embodiment of the invention relates to a kind of power line carrier signal sending circuit.Second execution mode and first execution mode are basic identical, and difference mainly is:
In the first embodiment, resonant network is made of an inductance and a capacitances in series.
Yet in second execution mode, resonant network is made of an inductance, a resistance and a capacitances in series, as shown in Figure 9, one end of inductance connects power line, one end of the other end series resistance of inductance, one end of the other end series capacitance of resistance, the other end of electric capacity connects the drain electrode of metal-oxide-semiconductor.
Because resonant network can be made of an inductance and a capacitances in series, also can be made of an inductance, a resistance and a capacitances in series, makes that implementation of the present invention is flexible and changeable.
In addition, be appreciated that in actual applications that resonant network also can be other structures, constitutes resonant network as the mode with inductance and electric capacity parallel resistance, does not give unnecessary details one by one at this.
Third embodiment of the invention relates to a kind of power line carrier signaling method, and idiographic flow as shown in figure 10.
In step 1110, modulated carrier signal is input to the grid of metal-oxide-semiconductor.
Then, in step 1120, utilize the resonant network that is connected with the drain electrode of metal-oxide-semiconductor that carrier signal is carried out filtering, filtered carrier signal is transferred to power line.
In the present embodiment, metal-oxide-semiconductor is the NMOS pipe.
Owing to be to leach useful carrier signal by the external resonant network to be transferred on the power line, avoided the use of isolating transformer, thereby effectively avoided limited, magnetically saturated situation takes place easily, and the risk of relative damage power amplifier because of the power capacity of isolating transformer.And, simplified the complexity of transtation mission circuit, have advantages such as circuit is simple, application cost is low, area occupied is little.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (8)
1. a power line carrier signal sending circuit is characterized in that, comprises a metal-oxide-semiconductor and the resonant network that is used for signal is carried out filtering;
Wherein, the grid of described metal-oxide-semiconductor connects modulated carrier signal, the source ground of described metal-oxide-semiconductor, and the drain electrode of described metal-oxide-semiconductor connects described resonant network and power line.
2. power line carrier signal sending circuit according to claim 1 is characterized in that, described resonant network is made of an inductance and a capacitances in series:
Wherein, an end of described inductance connects power line, a connect end of described electric capacity of the other end of described inductance, and the other end of described electric capacity connects the drain electrode of described metal-oxide-semiconductor.
3. power line carrier signal sending circuit according to claim 2 is characterized in that, the value of described inductance is 160uH, and the value of described electric capacity is 16nF.
4. power line carrier signal sending circuit according to claim 1 is characterized in that, described resonant network is made of an inductance, a resistance and a capacitances in series;
Wherein, an end of described inductance connects power line, a connect end of described electric capacity of a connect end of described resistance of the other end of described inductance, the other end of described resistance, and the other end of described electric capacity connects the drain electrode of described metal-oxide-semiconductor.
5. according to each described power line carrier signal sending circuit in the claim 1 to 4, it is characterized in that described metal-oxide-semiconductor is the NMOS pipe.
6. according to each described power line carrier signal sending circuit in the claim 1 to 4, it is characterized in that the substrate ground connection of described metal-oxide-semiconductor.
7. a power line carrier signaling method is characterized in that, comprises following steps:
Modulated carrier signal is input to the grid of metal-oxide-semiconductor;
Utilize the resonant network that is connected with the drain electrode of described metal-oxide-semiconductor that described carrier signal is carried out filtering, filtered carrier signal is transferred to power line.
8. power line carrier signaling method according to claim 7 is characterized in that, described metal-oxide-semiconductor is the NMOS pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101064717A CN102158258A (en) | 2011-04-27 | 2011-04-27 | Circuit and method for sending power line carrier (PLC) signals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101064717A CN102158258A (en) | 2011-04-27 | 2011-04-27 | Circuit and method for sending power line carrier (PLC) signals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929217A (en) * | 2014-05-05 | 2014-07-16 | 阳光电源股份有限公司 | Direct-current power line carrier communication transceiver, transmitter and receiver |
| CN103929217B (en) * | 2014-05-05 | 2016-11-30 | 阳光电源股份有限公司 | Direct current power carrier communication transceiver, transmitter and receiver |
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| CN101436882A (en) * | 2007-11-12 | 2009-05-20 | 凌岩 | Power-line carrier communication circuit |
| CN201359761Y (en) * | 2009-02-26 | 2009-12-09 | 浙江天诚电力载波有限公司 | Carrier wave transmitting circuit of low-voltage power line |
| CN201509182U (en) * | 2009-05-19 | 2010-06-16 | 深圳市九茂三水电气有限公司 | MOS efficient carrier digital amplifying circuit |
| CN101949963A (en) * | 2010-09-09 | 2011-01-19 | 西安信唯信息科技有限公司 | Energy saving lamp charging method by power line carrier remote meter reading |
| US20110056399A1 (en) * | 2008-04-28 | 2011-03-10 | Beijing Ebtech Technology Co., Ltd. | Electronic detonator control chip |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2396400Y (en) * | 1999-10-26 | 2000-09-13 | 李胜利 | Single phase electronic type intelligent network watt-hour meter |
| CN101436882A (en) * | 2007-11-12 | 2009-05-20 | 凌岩 | Power-line carrier communication circuit |
| US20110056399A1 (en) * | 2008-04-28 | 2011-03-10 | Beijing Ebtech Technology Co., Ltd. | Electronic detonator control chip |
| CN201359761Y (en) * | 2009-02-26 | 2009-12-09 | 浙江天诚电力载波有限公司 | Carrier wave transmitting circuit of low-voltage power line |
| CN201509182U (en) * | 2009-05-19 | 2010-06-16 | 深圳市九茂三水电气有限公司 | MOS efficient carrier digital amplifying circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929217A (en) * | 2014-05-05 | 2014-07-16 | 阳光电源股份有限公司 | Direct-current power line carrier communication transceiver, transmitter and receiver |
| CN103929217B (en) * | 2014-05-05 | 2016-11-30 | 阳光电源股份有限公司 | Direct current power carrier communication transceiver, transmitter and receiver |
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Application publication date: 20110817 |