CN214959534U - Protection circuit for power line communication - Google Patents
Protection circuit for power line communication Download PDFInfo
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- CN214959534U CN214959534U CN202121288242.7U CN202121288242U CN214959534U CN 214959534 U CN214959534 U CN 214959534U CN 202121288242 U CN202121288242 U CN 202121288242U CN 214959534 U CN214959534 U CN 214959534U
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Abstract
A protection circuit for power line communication comprises a synchronous phase detection circuit, a single chip microcomputer and a time-sharing control circuit, wherein a power input end of the synchronous phase detection circuit and a power input end of the time-sharing control circuit are connected with a power line, an electrical signal input end of the single chip microcomputer is connected with an electrical signal output end of the synchronous phase detection circuit, an electrical signal output end of the single chip microcomputer is connected with an electrical signal input end of the time-sharing control circuit, an output power supply of the time-sharing control circuit is output to a receiving end and a load, the protection circuit is characterized in that the time-sharing control circuit is connected with a power switch circuit in parallel, and a control signal output end of the single chip microcomputer is connected with a control signal input end of the power switch circuit. Compared with the prior art, the invention has the advantages of ensuring the smooth operation of the power line carrier communication and preventing the damage of overcurrent to the circuit elements of the power line carrier communication.
Description
Technical Field
The utility model relates to an electric power communication field, especially communication technology based on 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 cycle in a chopping manner, and the chopped time length mapped by data elements constituting transmission data are obtained, so that, along with the transmission of electric power, information including chopping is also transmitted, and the chopped information is separated at the receiving end, so as to obtain the data elements constituting the transmission data corresponding to the chopped time length, thereby realizing power line carrier communication. According to the technology, the time-sharing control circuit for chopping needs to continuously supply power to the load besides realizing power line carrier, and the time-sharing control circuit is not provided with a protection design, so that once overcurrent occurs, for example, when the load end is short-circuited, a silicon controlled element in the time-sharing control circuit can be damaged.
Disclosure of Invention
The present invention aims to provide a protection circuit for power line communication, which can ensure smooth performance of power line carrier communication and simultaneously prevent overcurrent from damaging power line carrier communication circuit elements.
The invention is realized by the following steps that the power supply input end of the synchronous phase detection circuit and the power supply input end of the time sharing control circuit are connected with a power line, the electric signal input end of the single chip is connected with the electric signal output end of the synchronous phase detection circuit, the electric signal output end of the single chip 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 and a load.
When the power line communication is needed, the singlechip controls the time-sharing control circuit to work, meanwhile, the power supply switching circuit is controlled to be disconnected, the singlechip controls the time-sharing control circuit to chop alternating current so as to output the chopped alternating current serving as a power line carrier communication source to a receiving end and a load, after the power line carrier communication is completed, the singlechip controls the power supply switching circuit to be switched on, the power grid alternating current power supply supplies power to the load through the power supply switching circuit, and then the singlechip controls the time-sharing control circuit to stop working.
Because the time period for communication through the power line is short, when the power line communication is carried out, the time-sharing control circuit works to disconnect the power switch circuit, the power supply to the load can be kept through the time-sharing control circuit, communication information is formed through chopping of the time-sharing control circuit, the communication information is sent to the receiving end, after the communication is completed, the single chip microcomputer controls the power switch circuit to be opened and then controls the time-sharing control circuit to be opened, and therefore, the power grid supplies power to the load through the power switch circuit, damage to the time-sharing control circuit due to overcurrent caused by accidents of the load end, such as circuit breaking, is avoided, and the load end is in a normal working state when the single chip microcomputer controls the time-sharing control circuit to work, and therefore, the overcurrent phenomenon cannot occur.
Here, the power switching circuit includes a switching circuit controlled by a single chip microcomputer, and a normally closed relay switch controlled by the switching circuit. When communication is not carried out at ordinary times, the normally closed relay switch is in a closed state, a power grid supplies power to a load end through the normally closed relay switch, when communication is required, the singlechip controls the time-sharing control circuit to work and then sends a control electric signal to the switch circuit to open the switch circuit, and outputs a power supply to the normally closed relay switch to open the normally closed relay switch, so that the time-sharing control circuit can provide chopped alternating current with communication information to a receiving end and the load end under the control of the singlechip to realize power line communication; after the communication is finished, the single chip microcomputer stops sending a control electric signal to the switch circuit, the normally closed relay switch is enabled to be in a normally closed state after the power supply provided by the switch circuit is lost, the power grid is enabled to supply power to the load through the normally closed relay switch, and then the single chip microcomputer controls the time-sharing control circuit to stop working, so that the time-sharing control circuit is prevented from being damaged due to overcurrent.
Here, a voltage compensation circuit for ensuring the stability of the power waveform is connected to the power input terminal of the time-sharing control circuit, and the power switch circuit is connected in parallel to the voltage compensation circuit and the time-sharing control circuit connected in series.
When the alternating current power supply works, if the voltage of the alternating current power supply is instantly reduced due to the influence of the outside (such as when large-scale high-power electric appliances such as an air conditioner and the like are started), the sine waveform of the alternating current voltage is jittered, the voltage compensation circuit compensates the voltage drop part to ensure the stability of the sine wave of the voltage of the alternating current input to the power input end of the time-sharing control circuit, thus, the waveform of the chopped alternating current can be ensured to be stable and accurate, thereby ensuring the accuracy of the transmitted communication information, because the components used by the voltage compensation circuit are easily damaged by overcurrent, moreover, the voltage compensation circuit only needs to work when needing to communicate, therefore, the voltage compensation circuit is also included in the protection of the power switch circuit, so that the damage to the load end due to overcurrent caused by accidents is avoided, and the damage to components due to heating of the components caused by long-time work is also avoided.
Compared with the prior art, the utility model, its beneficial effect is: the method has the advantages of ensuring the smooth operation of the power line carrier communication and preventing the damage of overcurrent to the power line carrier communication circuit elements.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a circuit diagram of a power switch.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings and examples:
as shown in fig. 1, the utility model discloses a synchronous phase detection circuit 1, singlechip 2, time sharing control circuit 3, synchronous phase detection circuit 1's power input end, time sharing control circuit 3's power input end is connected with power line 4, singlechip 2's the signal of telecommunication input end and synchronous phase detection circuit 1's signal of telecommunication output end are connected, singlechip 2's signal of telecommunication output end links to each other with time sharing control circuit 3's signal of telecommunication input end, time sharing control circuit 3's output power exports receiving terminal 5 and load 6, its special character lies in time sharing control circuit 3 and has switch circuit 7, singlechip 2's control signal output end links to each other with switch circuit 7's control signal input end.
During operation, when power line communication needs to be carried out, the single chip microcomputer 2 controls the time-sharing control circuit 3 to work, meanwhile, the power switch circuit 7 is controlled to be opened, the single chip microcomputer 2 controls the time-sharing control circuit 3 to chop alternating current, chopped alternating current serving as a power line carrier communication source is output to the receiving end 5 and the load 6, after the power line carrier communication is completed, the single chip microcomputer 2 controls the power switch circuit 7 to be conducted, a power grid alternating current power source of the power line 4 supplies power to the load 6 through the power switch circuit 7, and then the single chip microcomputer 2 controls the time-sharing control circuit 3 to stop working. After the receiving end 5 receives the power line signal, the receiving end 5 mediates the control signal transmitted by the power line and controls the load 6 to operate.
Preferably, as shown in fig. 2, the power switch circuit 7 includes a switch circuit 701 controlled by the single chip microcomputer 2, and a normally closed relay switch 702 controlled by the switch circuit 701.
Preferably, a voltage compensation circuit 8 for ensuring the stability of the power waveform is connected to the power input end of the time-sharing control circuit 3, and the power switch circuit 7 is connected in parallel to the voltage compensation circuit 8 and the time-sharing control circuit 3 which are connected in series.
Claims (3)
1. A protection circuit for power line communication comprises a synchronous phase detection circuit, a single chip microcomputer and a time-sharing control circuit, wherein a power input end of the synchronous phase detection circuit and a power input end of the time-sharing control circuit are connected with a power line, an electrical signal input end of the single chip microcomputer is connected with an electrical signal output end of the synchronous phase detection circuit, an electrical signal output end of the single chip microcomputer is connected with an electrical signal input end of the time-sharing control circuit, an output power supply of the time-sharing control circuit is output to a receiving end and a load, the protection circuit is characterized in that the time-sharing control circuit is connected with a power switch circuit in parallel, and a control signal output end of the single chip microcomputer is connected with a control signal input end of the power switch circuit.
2. The protection circuit for power line communication according to claim 1, wherein the power switching circuit comprises a switching circuit controlled by a single chip, and a normally closed relay switch controlled by the switching circuit.
3. The protection circuit for power line communication according to claim 1, wherein a voltage compensation circuit for ensuring the stability of the power waveform is connected to the power input terminal of the time-sharing control circuit, and the power switching circuit is connected in parallel to the voltage compensation circuit and the time-sharing control circuit connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121288242.7U CN214959534U (en) | 2021-06-09 | 2021-06-09 | Protection circuit for power line communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121288242.7U CN214959534U (en) | 2021-06-09 | 2021-06-09 | Protection circuit for power line communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214959534U true CN214959534U (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121288242.7U Active CN214959534U (en) | 2021-06-09 | 2021-06-09 | Protection circuit for power line communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214959534U (en) |
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2021
- 2021-06-09 CN CN202121288242.7U patent/CN214959534U/en active Active
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| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230911 Address after: A2 4th floor, Hantian science and Technology City, Shenhai Road, Guicheng, Nanhai, Foshan City, Guangdong Province 528200 Patentee after: FOSHAN HUIHAO INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 526100 30m north of Shangjing Xiyuan, Nanxing Fourth Road, Nan'an, Gaoyao District, Zhaoqing City, Guangdong Province Patentee before: Zhaoqing Yueda Intelligent Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |