JPH0281521A - Indoor lighting line terminating equipment - Google Patents

Abstract

PURPOSE:To ensure lighting line carrier communication by connecting a load with an inductive or resistive characteristic to the start and termination of an indoor lighting line. CONSTITUTION:When a device of a low capacitive impedance is connected to indoor lighting lines l1-l4, the amplitude of a high frequency signal superimposed on a signal on the indoor lighting lines l1-l4 is decreased due to the low impedance of the device, series resonance takes place by the inductive component of the indoor lighting lines l1-l4 and the capacitive component of the device resulting in producing a point where the impedance to the high frequency signal is extremely small. However, an inductive or resistive load 2 whose impedance is nearly 3OMEGA is connected to the termination of the indoor lighting lines l1-l4 so as to avoid it that the impedance with respect to the high frequency signal is extremely small or the occurrence of series resonance does not take place while taking the tendency of the impedance of an electric equipment, the general wiring method of the indoor lighting lines l1-l4 and its length into account. Thus, it is possible to avoid the decreased signal level in any point of the indoor lighting lines l1-l4 than the signal reception level and the disabled signal transmission is prevented.

Description

[Detailed Description of the Invention] [Field of Application of M Tojo] Is the present invention an electric light? The indoor power line is suitable for securing 3 pJia of power, especially when a capacitive load is connected, by using the fM as a signal transmission path and maintaining the power line transport method to control the equipment connected to the power line. Regarding.

[Conventional O technology]

As described in Japanese Unexamined Patent Publication No. 57-57545, a conventional technique involves inserting a resistive impedance between one line at the center point in a signal transmission line constituted by wired lines extending radially from the center point. By sipping, series resonance occurs due to the IBK portion of the line and the C portion that occurs in the line in the open state with no load? Even if I woke up, the level of No. 1 would no longer be close to 0.

[The problem that the invention attempts to solve]

Although the above conventional technology can increase the equivalent impedance, it cannot create a resonant point.Also, the transmitting point is near the resistive impedance O and the receiving point is inserted when viewed from the transmitting point. On the opposite side of the resistive impedance (in some cases, the impedance seen from the transmitting point is R(1-w' L
C)/1-w'Lc+jwCR 5°, where R is the inserted pure resistance, L is the inductor y, C1f is the capacitor, and W is the angular frequency. In this case, if series resonance occurs and becomes L 1-w"Lcmo, the impedance becomes FiO and the effect of insertion becomes ineffective.In fact, if a capacitive load is connected to the transmission path, series resonance will occur due to optical separation. I'm happy with what I can think of.

The purpose of the present invention is to ensure that no matter what kind of load is connected to the transmission line,
Eliminate series resonance, prevent impedance from becoming extremely small (from any point on the transmission path,
The purpose is to ensure that power line carrier communication can be carried out reliably.

[Means to solve the problem]

The above object is achieved by connecting an inductive or resistive load with an impedance of about 3Ω to the starting and ending ends of the indoor power line.

[Effect]

When a capacitive low-impedance device is connected to an indoor power line, the high-frequency signal superimposed on the indoor power line may become small due to the low impedance of the device, or the high frequency signal superimposed on the indoor power line may be connected in series due to the induction component of the indoor power line and the capacitance of the device. cause co-S, and the impedance to high frequency signals is extremely small rx
Make a dot. However, considering the impedance trends of electrical equipment and the wiring method and length of general indoor light lines, it is possible that series resonance will not occur at the end of the above indoor light lines, or that the impedance to high-frequency signals will be extremely small. By connecting an inductive or resistive load with an impedance of about 3Q, the signal level at any point on the indoor power line can be made to be lower than the signal reception level, and the signal cannot be transmitted. There is no such thing.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is a diagram in which the starting end and terminating device of the present invention are connected to an indoor power line. Reference numeral 1 indicates a distribution board, and Q1 to Q4 are branched from the distribution board and wired to each indoor room. Reference numeral 2 denotes an indoor electric light; 1 is a terminal device connected to each terminal of i to Q4, and 3 is a start device connected to the start end of the indoor electric light line.

Here, to simplify the explanation, start device [3, end device 2]
First, the second prisoner will explain the electric light line transportation system, considering only the indoor electric light line Q1 in the case where there is no indoor electric light line Q1. 4 is a controller that superimposes a control signal on the indoor power line to control the equipment;
is an adapter that receives the control signal, 8 is a controlled device, and 6.7 is an electrical device connected to the indoor power line 21. The controller superimposes an O-control signal on the indoor power line Q1 and sends it to the adapter 5 in order to receive a command to turn the controlled device ON through some input means, such as a device control switch. When the adapter receives the ON control signal, it turns on the controlled device 8i. Here, it is assumed that the electrical equipment 6.7 connected to the indoor power line Q1 has a structure in which a capacitor is inserted between the power supply lines, or has a capacitive power supply circuit. Also, V used for indoor electric light lines.
VF cables and the like are regarded as signal transmission paths with distributed constants, and the electrical equipment 6.7 and the VVF cables and the like can be equivalently expressed as shown in Fig. 3. The indoor power line Q1 becomes an inductive impedance, which causes series resonance with the composite impedance of the electrical equipment 6.7, which is the capacitive impedance, and attenuates the signal for controlling the equipment connected to the adapter B5. There is.

The situation is shown in Figure 4. The position of the attenuation point is 1/w″L
C (w: angular frequency, L: inductance, C: capacitor), and the 41!r level is the adapter 5 above.
In some cases, the signal level may be lower than the received level. Therefore, by increasing the signal level at this attenuation point, no signal will not be transmitted.

Therefore, the terminal can be short-circuited with an impedance having a certain characteristic to change the transmission characteristic. Next, we will explain what kind of impedance characteristics will cause a short circuit.

Electrical equipment 6.7 is combined into one capacitive load and L Z,
−R, −j X, Also, if the sum of the impedance that shorts the terminal and the line constant is ftZs-ya+JXs, the combined impedance is Z-1/(R++R,)
”+(X, -X, ) Snow (B1.
(Xm Z+kai-X, Z, 嘗)).

Here, if Z, "-X, Z,"> o, it no longer looks like a capacitive impedance. Also, the horse is small (X.

When is close to X, the real part becomes large and the signal level does not become very low.

Therefore, taking into consideration the combined impedance of the equipment when the signal level becomes low, which can be considered based on the trends in electrical equipment and the way the electrical equipment is connected, the terminal end of the indoor power line can be equivalently expressed as shown in Figure 6. If a load that appears to be inductive and has an impedance of about 5Q is short-circuited, series resonance may not occur as shown in Figure 5, and even if series resonance occurs, the electric device may Since the real part of the base impedance 2 of the line and the terminal load is large, there is no possibility that the signal level will be extremely low and rx < rx and the signal will not be transmitted.

Incidentally, in the above explanation, the f signal is sent from the controller to the adapter, but of course bidirectional communication can also be considered. Therefore, as mentioned above, at the beginning of the indoor lantern, connect an impedance load with the transmission characteristics such that the signal level is less than the reception level at any point on the indoor light line. However, a signal locking device is usually attached to the starting end of the road light transport system to prevent the control signal from going outside, but this characteristic must also be taken into consideration when determining the impedance of the load connected to the starting end. .Also, Figure 51!6 represents equivalently,
Although the numbers are listed in terms of resistance and inductance, in reality, in order to connect to the luminous layer, all capacitors are inserted as in the termination device [t2 and start device 5 in Fig. 1] to cut the low frequency component.

〔Effect of the invention〕

According to the present invention, no matter what kind of equipment is connected to which outlet of one indoor light line, the signal level will not be lower than the reception level of the signal receiver, and the signal will not be transmitted. Can we improve the reliability of the light fa transport system?

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the present invention in which the starting and terminating devices are connected to an indoor light line, and Fig. 2 is an example in which the above-mentioned indoor 1 light source is connected to the above-mentioned indoor 1 light source (the light transportation system and 1 light equipment are all connected). Fig. 6 is a circuit diagram equivalent to the example shown in Fig. A2, and Fig. 4 is a diagram showing the 1M level and the distance in the example of Fig. Rin2. Figure 5 is a diagram when the signal level is changed to fc, and Figure 6 is an explanatory diagram of an equivalent circuit of a terminal device connected to an indoor lighting SCO terminal. End y8fc direct, 5... Starting end device, 4... Controller, 5... Adapter 56.
・・・(Kiisokan, 7...′ air equipment, 8... Controlled equipment, Q1-L4... Indoor electric light edge.

Claims (1)

[Claims] 1. In a power line transportation system that controls electrical equipment by superimposing high-frequency signals on indoor power lines, it is characterized in that a load with inductive or resistive characteristics is connected in advance to the starting and ending ends of the indoor power lines. Indoor power line termination equipment.