阅读说明：本技术 一种plc控制方法和装置 (PLC control method and device ) 是由 张帆 肖鹏 钟威 夏芳 潘稻 于 2018-09-25 设计创作，主要内容包括：本申请实施例提供了一种PLC控制方法和装置,控制通过零线、以及零线与差分信号处理电路之间的通路传输第一信号；控制通过火线、以及火线与差分信号处理电路之间的通路传输第二信号；将差分信号处理电路与零线或火线之间的通路切断并将差分信号处理电路与所述地线之间导通,当地线的传输速率大于或等于预设的传输速率阈值时,通过地线、以及地线与差分信号处理电路之间的通路传输第一信号或第二信号。由于电力线路中地线干扰小,因此将差分信号处理电路中任一信号通过地线传输,隔离了一部分的电网噪声,传输信噪比变大,进而提高了电力线通信调制解调器的传输速率。(The embodiment of the application provides a PLC control method and a PLC control device, which are used for controlling the transmission of a first signal through a zero line and a passage between the zero line and a differential signal processing circuit; controlling transmission of a second signal through the live line and a path between the live line and the differential signal processing circuit; and when the transmission rate of the ground wire is greater than or equal to a preset transmission rate threshold value, transmitting a first signal or a second signal through the ground wire and the passage between the ground wire and the differential signal processing circuit. Because the ground wire interference in the power line is small, any signal in the differential signal processing circuit is transmitted through the ground wire, part of power grid noise is isolated, the transmission signal-to-noise ratio is increased, and the transmission rate of the power line communication modem is further improved.)

A PLC control method for power line communication, which is used for transmitting a differential signal, wherein the differential signal includes a first signal and a second signal, the method comprising:

conducting a differential signal processing circuit with a zero line, and transmitting the first signal through the zero line and a passage between the zero line and the differential signal processing circuit, wherein the differential signal processing circuit is used for processing the differential signal;

conducting the differential signal processing circuit with a live wire, and transmitting the second signal through the live wire and a path between the live wire and the differential signal processing circuit;

and cutting off a path between the differential signal processing circuit and the zero line, conducting the differential signal processing circuit and a ground wire, and transmitting a first signal through the ground wire and the path between the ground wire and the differential signal processing circuit when the transmission rate of the ground wire is greater than or equal to a preset transmission rate threshold value.

The method of claim 1, further comprising:

and cutting off a path between the differential signal processing circuit and the live wire, conducting the differential signal processing circuit and the zero line, and transmitting the second signal through the zero line and the path between the zero line and the differential signal processing circuit.

The method of claim 1, further comprising:

and the differential signal processing circuit is conducted with the zero line, and the second signal is transmitted through the zero line, the passage between the zero line and the differential signal processing circuit, the live wire and the passage between the live wire and the differential signal processing circuit.

A PLC control method for power line communication, which is used for transmitting a differential signal, wherein the differential signal includes a first signal and a second signal, the method comprising:

conducting a differential signal processing circuit with a zero line, and transmitting the first signal through the zero line and a passage between the zero line and the differential signal processing circuit, wherein the differential signal processing circuit is used for processing the differential signal;

conducting the differential signal processing circuit with a live wire, and transmitting the second signal through the live wire and a path between the live wire and the differential signal processing circuit;

and cutting off a path between the differential signal processing circuit and the live wire, conducting the differential signal processing circuit and a ground wire, and transmitting a second signal through the ground wire and the path between the ground wire and the differential signal processing circuit when the transmission rate of the ground wire is greater than or equal to a preset transmission rate threshold value.

The method of claim 4, further comprising:

and cutting off a path between the differential signal processing circuit and the zero line, conducting the differential signal processing circuit and the live wire, and transmitting a first signal through the live wire and the path between the live wire and the differential signal processing circuit.

The method of claim 4, further comprising:

and the differential signal processing circuit is conducted with the live wire, and the first signal is transmitted through the live wire, the passage between the live wire and the differential signal processing circuit, the zero line and the passage between the zero line and the differential signal processing circuit.

A PLC control device, comprising: the PLC comprises a PLC chip, a first switch and a differential signal processing circuit, wherein the differential signal processing circuit is used for processing differential signals, the differential signals comprise first signals and second signals, a first signal end of the differential signal processing circuit is used for transmitting the first signals, a second signal end of the differential signal processing circuit is used for transmitting the second signals, the PLC chip is provided with a control signal end, and the control signal end is used for outputting control signals;

the first signal end is respectively connected with a live wire and a ground wire through the first switch;

transmitting the second signal through the fire line and a path between the fire line and the second signal terminal;

the PLC chip is used for outputting a control signal through the control signal end, the control signal is used for controlling the first switch to conduct the first signal end and a zero line, and the first signal is transmitted through the zero line and a passage between the zero line and the first signal end;

the control signal is further used for controlling the first switch to cut off a path between the first signal end and the zero line, controlling the first switch to conduct the first signal end and the ground wire, and transmitting a first signal through the ground wire and the path between the ground wire and the first signal end when the transmission rate of the ground wire is greater than or equal to a preset transmission rate threshold value.

The apparatus of claim 7, further comprising a second switch, wherein:

the second signal end is respectively connected with the live wire and the zero wire through the second switch;

the control signal is further used for controlling the second switch to cut off a path between the second signal end and the live wire, controlling the second switch to conduct the second signal end and the zero line, and transmitting the second signal through the zero line and the path between the zero line and the second signal end.

The apparatus of claim 7, further comprising a second switch, wherein:

the second signal end is connected with a zero line through the second switch;

the control signal is also used for controlling the second switch to conduct the second signal end and the zero line, and the second signal is transmitted through the zero line, the passage between the zero line and the second signal end, the live wire and the passage between the live wire and the second signal end together.

The apparatus of claim 9, further comprising a coupling capacitor, wherein:

and two ends of the coupling capacitor are respectively and electrically connected with the second switch and the zero line.

A PLC control device, comprising: the PLC comprises a PLC chip, a second switch and a differential signal processing circuit, wherein the differential signal processing circuit is used for processing the differential signal, the differential signal comprises a first signal and a second signal, a first signal end of the differential signal processing circuit is used for transmitting the first signal, a second signal end of the differential signal processing circuit is used for transmitting the second signal, the PLC chip is provided with a control signal end, and the control signal end is used for outputting a control signal;

the second signal end is respectively connected with a zero line and a ground wire through the second switch;

transmitting the first signal through the zero line and a passage between the zero line and the first signal end;

the PLC chip is used for outputting a control signal through the control signal end, the control signal is used for controlling the second switch to conduct the second signal end with a live wire, and the second signal is transmitted through the live wire and a passage between the live wire and the second signal end;

the control signal is further configured to control the second switch to cut off a path between the second signal terminal and the live wire, control the second switch to connect the second signal terminal to the ground wire, and transmit a second signal through the ground wire and the path between the ground wire and the second signal terminal when a transmission rate of the ground wire is greater than or equal to a preset transmission rate threshold.

The apparatus of claim 11, further comprising a first switch, wherein:

the first signal end is respectively connected with the live wire and the zero wire through the first switch;

the control signal is further used for controlling the first switch to cut off a path between the first signal end and the zero line, controlling the first switch to conduct the first signal end and the live wire, and transmitting the first signal through the live wire and the path between the live wire and the first signal end.

The apparatus of claim 11, further comprising a first switch, wherein:

the first signal end is connected with a live wire through the first switch;

the control signal is also used for controlling the first switch to conduct the first signal end and the live wire, and the first signal is transmitted through the zero line, the passage between the zero line and the first signal end, the live wire and the passage between the live wire and the first signal end.

The apparatus of claim 13, further comprising a coupling capacitor, wherein:

and two ends of the coupling capacitor are respectively and electrically connected with the first switch and the live wire.