CN214959536U

CN214959536U - Chopping device for power line communication

Info

Publication number: CN214959536U
Application number: CN202121288246.5U
Authority: CN
Inventors: 陈广佳; 陈卫君
Original assignee: Zhaoqing Yueda Intelligent Technology Co ltd
Current assignee: Foshan Huihao Intelligent Technology Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-11-30
Anticipated expiration: 2031-06-09

Abstract

A chopper for power line communication is prepared as connecting power input end of synchronous phase detection circuit to power line, connecting electric signal input end of time-sharing control circuit to electric signal output end of synchronous phase detection circuit, connecting electric signal output end of single chip to electric signal input end of time-sharing control circuit and outputting output power of time-sharing control circuit to receiving end.

Description

Chopping device for power line communication

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 chopping time length corresponds to the data element of the transmission data, so that the precision of the chopping time length is high, otherwise, the actual chopping time length does not accord with the set chopping time length, and the transmission data is wrong or even fails. Theoretically, as long as the stability of the electrical component is ensured, the accuracy of the chopping time duration can be ensured, but due to the influence of the line-mounted capacitor, and in different occasions, the electric quantity of the line-mounted capacitor is different, as shown in the waveform of the upper graph of fig. 3, when chopping is performed according to the chopping time duration T0, due to the influence of the discharge of the line-mounted capacitor, both sides of the chopping position of the chopped ac power waveform have the residual a of the discharge of the capacitor, as shown in the waveform of the lower graph of fig. 3, so that the inaccuracy of the chopping waveform is influenced, the accuracy of the transmitted data is finally influenced, and even the data transmission fails.

Disclosure of Invention

The utility model aims to provide a chopping device for power line communication that can prevent that line carries electric capacity influence time length precision of chopping.

The utility model discloses a chopper for power line communication realizes like this, including synchronous phase detection circuit, a single-chip microcomputer, the timesharing control circuit, the power input end of synchronous phase detection circuit, the power input end and the power line connection of timesharing control circuit, the signal of telecommunication input end and synchronous phase detection circuit's of singlechip signal of telecommunication output end are connected, the signal of telecommunication output end and the signal of telecommunication input end of timesharing control circuit of singlechip link to each other, the receiving terminal is exported to timesharing control circuit's output power supply, its special character lies in being provided with and connects the line on the electric wire netting and carry electric capacity bleeder circuit, the line carries electric capacity bleeder circuit including concatenating MOS pipe together, resistance, the control signal output of singlechip links to each other with the control signal input end of MOS pipe.

When the synchronous phase detection circuit works, the synchronous phase detection circuit connected with a power grid detects the phase of alternating current, the single chip microcomputer controls the time-sharing control circuit to chop an alternating current power supply according to a preset phase and a chopping wavelength corresponding to transmission data, the chopped alternating current power supply is output to a receiving end, a loop is cut off from the power grid during chopping, the single chip microcomputer controls an MOS (metal oxide semiconductor) tube connected with the power grid to be conducted, the line-mounted capacitor discharge circuit is conducted, the electricity of a line-mounted capacitor in the loop is discharged, and when the chopping is completed, the single chip microcomputer controls the MOS tube to be disconnected, so that the line-mounted capacitor discharge circuit is disconnected.

Here, the overcurrent detection signal input end of the single chip microcomputer is connected between the MOS tube and the resistor. Therefore, once overcurrent is detected, the MOS tube is controlled to stop working through overcurrent detection, and accordingly overcurrent protection of the MOS tube is achieved.

The voltage detection signal input end of the singlechip is connected with the power grid through a resistor R1. Therefore, through voltage detection, once the MOS tube is in overvoltage, the MOS tube is controlled to stop working, and overvoltage protection of the MOS tube is achieved.

Here, the on-line capacitance bleeder circuit is connected to the grid through a bridge rectifier circuit. Thus, even if chopping is performed in each half cycle of the alternating current, the on-line capacitance discharging process can be performed.

Compared with the prior art, the utility model, its beneficial effect is: the method has the advantage of preventing the line-loaded capacitor from influencing the chopping time precision.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a circuit diagram of a line-mounted capacitor bleeder circuit;

fig. 3 is a waveform diagram of an ac power supply after chopping under the influence of line-load capacitive discharge.

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 apparatus for power line communication of the present invention is implemented by including a synchronous phase detection circuit 1, a single chip microcomputer 2, and a time-sharing control circuit 3, wherein a power input terminal of the synchronous phase detection circuit 1 and a power input terminal of the time-sharing control circuit 3 are connected to a power line 4, an electrical signal input terminal of the single chip microcomputer 2 is connected to an electrical signal output terminal of the synchronous phase detection circuit 1, an electrical signal output terminal of the single chip microcomputer 2 is connected to an electrical signal input terminal of the time-sharing control circuit 3, an output power of the time-sharing control circuit 3 is outputted to a receiving terminal 5 and a load 6, the on-line capacitance bleeder circuit 7 is characterized in that the on-line capacitance bleeder circuit 7 is connected in parallel to a power grid, the on-line capacitance bleeder circuit 7 comprises an MOS tube Q1 and a resistor R (composed of resistors R2 and R3 which are 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 a power grid are respectively connected with two power input ends of the bridge rectifier circuit D, and a line-mounted capacitor bleeder circuit is connected in parallel with a power output end of the bridge rectifier circuit D.

Preferably, the overcurrent detection signal input end of the single chip microcomputer 2 is connected between the MOS transistor Q1 and the resistor R.

Preferably, the voltage detection signal input end of the single chip microcomputer 2 is connected with the positive electrode of the power supply output end of the bridge rectifier circuit D through a resistor R1.

The chopping method for power line communication of the present invention is realized by performing voltage phase detection on the alternating current on the power line 4 of the power grid through the synchronous phase detection circuit 1 to determine the synchronous reference voltage phase of zero phase or pi integer phase;

the single-chip microcomputer 2 controls the time-sharing control circuit 3 to carry out chopping processing on alternating current according to the synchronous reference voltage phase and the set chopping time length, a power line 4 loop is cut off from a power grid during chopping, the single-chip microcomputer 2 controls an MOS (metal oxide semiconductor) tube Q1 of the line-loaded capacitor discharge circuit 7 to be conducted so as to put in a discharged resistor R, the electricity of a line-loaded capacitor in the loop is discharged, the single-chip microcomputer 2 controls an MOS tube Q1 of the line-loaded capacitor discharge circuit 7 to be disconnected during completion of chopping, the discharged resistor R is disconnected, an output power supply of the time-sharing control circuit 3 is output to the receiving end 5, and the receiving end 5 mediates a control signal transmitted by the power line and controls a load 6 to work.

Claims

1. The utility model provides a chopper for power line communication, including synchronous phase detection circuit, a single-chip microcomputer, the timesharing control circuit, the power input of synchronous phase detection circuit, the power input of timesharing control circuit is connected with the power line, the signal of electricity input of single-chip microcomputer is connected with the signal of electricity output of synchronous phase detection circuit, the signal of electricity output of single-chip microcomputer links to each other with the signal of electricity input of timesharing control circuit, the output power of timesharing control circuit exports the receiving terminal, its characterized in that is provided with and connects the line on the electric wire netting and carries the capacitance bleeder circuit, line carries the capacitance bleeder circuit including the MOS pipe that concatenates together, resistance, the control signal output of single-chip microcomputer links to each other with the control signal input of MOS pipe.

2. The chopper device for power line communication according to claim 1, wherein an overcurrent detection signal input terminal of the single chip microcomputer is connected between the MOS transistor and the resistor.

3. The chopper device for power line communication according to claim 1 or 2, wherein a voltage detection signal input terminal of the single chip microcomputer is connected to a power grid through a resistor R1.