CN113395088B - Chopping method and device for power line communication - Google Patents
Chopping method and device for power line communication Download PDFInfo
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- CN113395088B CN113395088B CN202110644353.5A CN202110644353A CN113395088B CN 113395088 B CN113395088 B CN 113395088B CN 202110644353 A CN202110644353 A CN 202110644353A CN 113395088 B CN113395088 B CN 113395088B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
A chopping method and device for power line communication are characterized by comprising the following steps: comprising the following steps: detecting voltage phase of alternating current on the power line to determine synchronous reference voltage phase; and chopping the alternating current according to the synchronous reference voltage phase and the set chopping time length, cutting off the loop from the power grid while chopping, throwing the discharging resistor, discharging the electricity of the line-carried capacitor in the loop, and cutting off the discharging resistor while chopping is completed. Compared with the prior art, the invention has the advantage of preventing the line-carried capacitor from influencing the chopping time length precision.
Description
Technical Field
The invention relates to the field of power communication, in particular to a communication technology based on a power line.
Background
Patent application CN201810439005.2 discloses a power line carrier technology, in which chopping is performed based on a reference phase in more than one ac voltage period in a chopping manner, and the chopping time length is mapped with the chopping time length of data elements forming transmission data, so that along with power transmission, information containing chopping is transmitted along with the information, and the chopped information is separated at a receiving end, so that the data elements forming the transmission data corresponding to the chopping time length can be obtained, thereby realizing power line carrier communication. In the technology, because the chopping time length corresponds to the data element of the transmission data, the accuracy of the chopping time length is high, otherwise, the actual chopping time length is different from the set chopping time length, and the transmission data is wrong or even fails. In theory, the accuracy of chopping time can be guaranteed only by guaranteeing the stability of the electrical element, however, due to the influence of the wired load capacitor, and in different occasions, the electric quantity of the wired load capacitor is different, as shown in the upper graph waveform of fig. 3, when chopping according to the chopping time length T0, due to the influence of the discharging of the wired load capacitor, the two sides of the chopping position of the chopped alternating current power waveform have residual a of discharging of the capacitor, and the lower graph waveform of fig. 3 is shown, thereby influencing the inaccuracy of the chopping waveform, finally influencing the accuracy of transmitted data, and even causing failure of data transmission.
Disclosure of Invention
The invention aims to provide a chopping method and a chopping device for power line communication, which can prevent a line-carried capacitor from influencing the precision of chopping time length.
The chopping method for power line communication of the present invention is realized by comprising:
detecting voltage phase of alternating current on the power line to determine synchronous reference voltage phase;
and chopping the alternating current according to the synchronous reference voltage phase and the set chopping time length, cutting off the loop from the power grid while chopping, throwing the discharging resistor, discharging the electricity of the line-carried capacitor in the loop, and cutting off the discharging resistor while chopping is completed.
In this way, in the chopping process, the electricity of the line-carried capacitor in the loop is discharged through the discharging resistor, so that after the chopping is finished, the electricity of the line-carried capacitor in the loop can not influence the chopping waveform, the actual detected chopping time length is ensured to be the same as the set chopping time length, and the smooth proceeding and the stable and reliable communication of the power line carrier are realized.
The synchronous reference voltage phase is zero or an integer of pi, chopping is carried out in each half period of alternating current, and the phase is put into a discharge resistor after bridge rectification, so that the electricity of a line-carried capacitor in a loop is discharged.
The chopper device for power line communication is realized by the steps of comprising a synchronous phase detection circuit, a singlechip and a time-sharing control circuit, wherein the power input end of the synchronous phase detection circuit and the power input end of the time-sharing control circuit are connected with a power line, the electric signal input end of the singlechip is connected with the electric signal output end of the synchronous phase detection circuit, the electric signal output end of the singlechip is connected with the electric signal input end of the time-sharing control circuit, and the output power supply of the time-sharing control circuit is output to a receiving end.
During operation, the synchronous phase detection circuit connected with the power grid detects the phase of alternating current, the singlechip controls the time-sharing control circuit to chop the alternating current power supply according to the preset phase and the chopping wavelength corresponding to transmission data, the chopped alternating current power supply is output to the receiving end, during chopping, the loop is cut off from the power grid, the singlechip controls the MOS tube connected with the power grid to be conducted, the line-mounted capacitor bleeder circuit is conducted, electricity of the line-mounted capacitor in the bleeder circuit is discharged, and the singlechip controls the MOS tube to be disconnected when the chopping is completed, so that the line-mounted capacitor bleeder circuit is disconnected.
Here, the overcurrent detection signal input end of the singlechip is connected between the MOS tube and the resistor. Therefore, through overcurrent detection, once overcurrent occurs, the MOS tube is controlled to stop working, so that overcurrent protection of the MOS tube is realized.
The voltage detection signal input end of the singlechip is connected with a power grid through a resistor R1. Therefore, once overvoltage is detected, the MOS tube is controlled to stop working, so that overvoltage protection of the MOS tube is realized.
Here, the line-load capacitance bleeder circuit is connected to the grid through a bridge rectifier circuit. Thus, even if chopping is performed every half cycle of the alternating current, the discharge processing of the line-load capacitor can be performed.
Compared with the prior art, the invention has the beneficial effects that: the method has the advantage of preventing the line-carried capacitor from affecting the precision of the chopping time length.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a line-load capacitance bleed circuit diagram;
fig. 3 is a waveform diagram of an ac power supply after chopping under the influence of discharge of a line-carrying capacitor.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings and examples:
as shown in fig. 1 and 2, the chopper device for power line communication of the present invention is realized by comprising a synchronous phase detection circuit 1, a singlechip 2, and a time-sharing control circuit 3, wherein the power input end of the synchronous phase detection circuit 1 and the power input end of the time-sharing control circuit 3 are connected with a power line 4, the electric signal input end of the singlechip 2 is connected with the electric signal output end of the synchronous phase detection circuit 1, the electric signal output end of the singlechip 2 is connected with the electric signal input end of the time-sharing control circuit 3, the output power supply of the time-sharing control circuit 3 is output to a receiving end 5 and a load 6, and the chopper device is characterized in that a line-mounted capacitor bleeder circuit 7 connected on a power grid in parallel is provided, the line-mounted capacitor bleeder circuit 7 comprises a MOS tube Q1 and a resistor R (composed of the resistors R2 and R3 connected in parallel), and the control signal output end of the singlechip 2 is connected with the control signal input end of the MOS tube Q1.
Preferably, a bridge rectifier circuit D is arranged, a live wire L and a ground wire N of a power line 4 of the power grid are respectively connected with two power input ends of the bridge rectifier circuit D, and a line-carried capacitor bleeder circuit is connected in parallel with the power output end of the bridge rectifier circuit D.
Preferably, the overcurrent detection signal input end of the singlechip 2 is connected between the MOS tube Q1 and the resistor R.
Preferably, the voltage detection signal input end of the singlechip 2 is connected with the positive electrode of the power output end of the bridge rectifier circuit D through a resistor R1.
The chopping method for power line communication is realized by detecting the voltage phase of alternating current on a power line 4 of a power grid through a synchronous phase detection circuit 1 so as to determine the synchronous reference voltage phase of zero phase or pi integer phase;
the singlechip 2 controls the time-sharing control circuit 3 to chop alternating current according to the synchronous reference voltage phase and the set chopping time length, the power line 4 loop is cut off from the power grid while chopping, the singlechip 2 controls the MOS tube Q1 of the line-carried capacitance bleeder circuit 7 to be conducted so as to throw in the discharged resistor R, the electricity of the line-carried capacitance in the loop is discharged, the singlechip 2 controls the MOS tube Q1 of the line-carried capacitance bleeder circuit 7 to be disconnected while chopping is completed so as to disconnect the discharged resistor R, the output power supply of the time-sharing control circuit 3 is output to the receiving end 5, and the receiving end 5 mediates the control signal transmitted by the power line and controls the load 6 to work.
Claims (5)
1. The utility model provides a chopper device for power line communication, including synchronous phase detection circuit, the singlechip, time-sharing control circuit, synchronous phase detection circuit's power input, time-sharing control circuit's power input is connected with the power line, the signal input part of singlechip is connected with synchronous phase detection circuit's signal output part, the signal output part of singlechip links to each other with time-sharing control circuit's signal input part, time-sharing control circuit's output power supply is to the receiving terminal, a serial-connected on-line capacitance bleeder circuit is provided with, the serial-connected MOS pipe that is in the same place including, a resistor, the control signal output part of singlechip links to each other with the control signal input part of MOS pipe, during operation, synchronous phase detection circuit who is connected with the electric wire netting detects the phase place of alternating current, the singlechip is according to the chopping wavelength that preset phase place and transmission data correspond, control time-sharing control circuit chops alternating current power supply is output to the receiving terminal, during the chopping, the return circuit cuts off from the electric wire netting, the MOS pipe that the singlechip is connected with the electric wire-carrying capacitance, wire carrying capacitance bleeder circuit is switched on, the electricity of wire carrying capacitance in the return circuit, the completion, the MOS that the control of the singlechip is carried capacitance bleeder circuit is disconnected.
2. The chopper apparatus for power line communication as claimed in claim 1, wherein the voltage detection signal input terminal of the single chip microcomputer is connected to the power grid through a resistor R1.
3. Chopping device for power line communication according to claim 1 or 2, characterized in that the line-carrying capacitive bleeder circuit is connected to the power grid via a bridge rectifier circuit.
4. A chopping method for power line communication according to claim 1 or 2 or 3, characterized by comprising:
detecting voltage phase of alternating current on the power line to determine synchronous reference voltage phase;
and chopping the alternating current according to the synchronous reference voltage phase and the set chopping time length, cutting off the loop from the power grid while chopping, throwing the discharging resistor, discharging the electricity of the line-carried capacitor in the loop, and cutting off the discharging resistor while chopping is completed.
5. The chopping method for power line communication according to claim 4, wherein the synchronous reference voltage phase is zero or an integer of pi, chopping is performed in each half cycle of the alternating current, and the discharging resistor is put into after bridge rectification, and the electricity of the line-carrying capacitor in the loop is discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110644353.5A CN113395088B (en) | 2021-06-09 | 2021-06-09 | Chopping method and device for power line communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110644353.5A CN113395088B (en) | 2021-06-09 | 2021-06-09 | Chopping method and device for power line communication |
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| CN113395088A CN113395088A (en) | 2021-09-14 |
| CN113395088B true CN113395088B (en) | 2023-10-03 |
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| CN202110644353.5A Active CN113395088B (en) | 2021-06-09 | 2021-06-09 | Chopping method and device for power line communication |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599812A (en) * | 2018-05-09 | 2018-09-28 | 北京星网锐捷网络技术有限公司 | Communication means, node device based on power line and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI481142B (en) * | 2012-06-19 | 2015-04-11 | Richtek Technology Corp | Bleeding circuit and method for reducing power consumption of an emi filter |
| CN105099134B (en) * | 2014-05-20 | 2018-07-06 | 维谛技术有限公司 | The drainage method and device of dc-link capacitance voltage in Technics of Power Electronic Conversion system |
| CN212258775U (en) * | 2020-07-17 | 2020-12-29 | 珠海格力电器股份有限公司 | Discharge control device and electric control equipment of bus capacitor |
| CN214959536U (en) * | 2021-06-09 | 2021-11-30 | 肇庆市跃达智能科技有限公司 | Chopping device for power line communication |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599812A (en) * | 2018-05-09 | 2018-09-28 | 北京星网锐捷网络技术有限公司 | Communication means, node device based on power line and system |
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