JPS58215939A - Power line carriage system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power line transport system that reduces the influence of heavy loads connected to power distribution lines.

Generally, the isochoric circuit of a transmission system is applied as shown in Figure 1. In the figure, li is the transmission line, 2 is the input impedance of the transmitter (Zs), 3 is the transmission output voltage (Es), 4 is the impedance of the receiver (ZR), and 5 is the line connection load (Zt).

In this case, the receiving section voltage ER and current IR are (ZR>>Z
In the above equations (1) and (2), in the power line conveyance system, there are cases where zL=o, such as when a fluorescent lamp with a power factor correction capacitor is turned on, so ER and IR dust are zero.
9 transmission becomes impossible.

The present invention was made for the purpose of reducing the reduction in the transmission signal level caused by heavy loads connected to power distribution lines using such a power line carrier system.

Figure 2 shows the load connection part of the power line transport system. As shown in the figure, by covering the core 7 over the connection line 6 to the heavy load (Zt) 5, an L (inductance) component is added in series with the heavy load (ZL). Figure 2 (a
) shows the insertion of the core 7, and FIG. 2(b) shows the equivalent circuit.

As described above, since the carrier frequency is from several tens of kilohertz to several hundred kilohertz, a coil of an appropriate size may be inserted in series with ZL. The impedance of the coil (impedance jωL) is sufficiently low at the power frequency (60 Hz or 50 Hz) so that it has no effect on the load 5, and the impedance at the carrier frequency is I 08 to 1.
04 times, and even if the load 5 fluctuates, it is possible to prevent the transmission signal level from decreasing. It is not necessarily necessary to disconnect the circuit when inserting the coil, as shown in Figure 2 (
A connecting wire 6 connects the core 7 of an appropriate shape to the load 5 as shown in a).
All you have to do is hit one Nizu.

The inductance obtained in this case is L=4πμ8T, assuming the number of turns is 1.
・(3) However, μe: effective magnetic permeability A: μ is set so that the receiver voltage ER and current IR can be obtained by the core cross-sectional area. ,
It is sufficient to select A and t and set the inductance L thereof.

In order to achieve a greater effect than when L is used alone, the capacitor (C) 8 is connected to the core (L) 7 as shown in Figure 3 ((a) is a connection state diagram, (b) is an equivalent circuit diagram). insert in parallel,
Parallel resonance may be caused at the carrier frequency.

This is useful because it has the advantage of preventing transmission signal attenuation.

As described above, according to the present invention, by covering the connection line to the heavy load with a core, an L component is added in series with the heavy load, and with a simple structure, the heavy load connected to the distribution line can increase the transmission signal level. It is possible to provide a more reliable and practical power line transport system by reducing the drop in power and preventing transmission failure.

[Brief explanation of the drawing]

FIG. 1 is an equivalent circuit diagram showing a general data transmission system, FIGS. ) and (b) are a main part connection state diagram and an equivalent circuit diagram showing another embodiment. 1...Transmission line, 4...Receiver impedance, 5...
・Line connection load, 6... Connection line, 7... Core, 8.
...Capacitor. Agent Patent attorney Aihiko Fuku (2 others) Figure 1 Figure 3

Claims (1)

[Scope of Claims] 1. A power line transport system for transmitting data using power line transport, characterized in that a core is placed over a connection line to a heavy load connected to a power distribution line. 2. The power line transport system according to item 1, further comprising a capacitor that resonates in parallel at a carrier frequency in parallel with the core.