JPS6360573B2 - - Google Patents

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a transmitter that transmits load control signals using a power line carrier method in series on the same power line, and a transmitter that receives a plurality of loads and load control signals and transmits these signals. This invention relates to a power line utilization system in which a plurality of receivers are connected to control each load, and relates to an improvement of a load control method.

(b) Background of the technology The power line utilization system described above is used, for example, to turn on and off lighting (fluorescent lights, mercury lamps) in each section of a gymnasium. A block diagram of this example system is shown in Figure 1.
A time chart of the load control signal from the transmitter 10 of FIG. 1 is shown in FIG. 3A.

From the transmitter 10 in FIG.
0,101 to the receivers 1 to n, the address of the receiver and the load dependent on each receiver (fluorescent lamp,
(Mercury lamp) A load control signal having control signals 1-a to na is transmitted in series to each receiver as shown in FIG. 3A.

Each of the receivers 1 to n receives and identifies the signal of its own address among the transmitted load control signals, and controls the load on the lighting power lines 100, 1 according to the content of the control signal.
Controls (turns on or off) the switch for turning on and off 01. When this control is performed, noise may be generated, and this noise is
If the noise level is large, it will interfere with the load control signal from the transmitter 10.

In addition, SW1 to SWn in Fig. 1 are loads 1-a to na-a.
This is a switch for turning each on and off.

(c) Prior art and problems The conventional receiver in the system shown in Figure 1 is
As shown in the figure, it is comprised of a signal detection section 11 that identifies and receives a load control signal sent to the local station, and a load control section 12 that controls a switch that turns on and off the load.

Figure 3 shows the time chart of the operation of each receiver. B, C, and D are the time charts of receivers 1, 2, and 3, and E and F are the time charts of receiver (n-1) and n. The pulse shape on the left shows the time Tp during signal reception, the next pulse shape shows the time Tl to control the switch that turns on and off the load, and the period between the two pulse shapes shows the time Tl for controlling the switch after receiving the signal. This time is short.

For example, when the receiver 1 in FIG. 1 receives a load control signal, it instantaneously controls the switch SW1, but at this time it may generate noise, which is transmitted to the lighting power lines 100 and 101. If this noise is large, it will interfere with the load control signal directed to the receiver 2. Therefore, the receiver 2 may not be able to receive the load control signal.

Of course, for example, when the receiver 1 receives the load control signal,
If the transmission speed were fast enough to finish transmitting the load control signal to receiver n before controlling switch SW1, this problem would not occur, but with the power line carrier method, the transmission speed cannot be made that fast. Therefore, for example, the time when receiver 1 controls switch SW1 is generally during the transmission of load control signal 2 to receiver 2 in FIG.
If the load control signal is entered before the load control signal is being transmitted, the load control signal to one of the receivers will be inhibited, and one of the receivers will not be able to receive the load control signal.

(d) Object of the Invention In view of the above-mentioned problems, the object of the present invention is to provide a load control method that allows a receiver to receive a load control signal without being affected by noise generated when controlling a switch that turns on and off a load.

(e) Arrangement of the Invention The above object is achieved by the arrangement of the invention which delays the load control of each receiver until all the receivers have received the load control signal.

That is, in this way, even if noise occurs during load control, all the receivers have already received the load control signal, so the receivers can receive the load control signal without being affected by this noise.

(f) Embodiment of the invention An embodiment of the invention will be described below with reference to the drawings.

FIG. 4 is a block diagram of a receiver according to an embodiment of the present invention.

The difference between FIG. 4 and FIG. 2 is that a delay circuit 13 is provided between the signal detection section 11 and the load control section 12, and after receiving the load control signal, the load control section 12 controls the switch that turns on and off the load. The point is that the time until this point is delayed. The delay time caused by this delay circuit 13 corresponds to the interval between the load control signals shown in FIG. 3A that the transmitter 10 in FIG. 1 transmits to each receiver.
If Ta and the number of receivers are N, then in the case shown in Figure 3, receiver 1 has (N-1) Ta, receiver 2 has (N-2) Ta...receiver (n-1) In this case, Ta may be set to 0 in receiver n.

In this way, the time to turn on and off each load is
This occurs after all receivers have received the load control signal, so even if noise occurs when the load is turned on or off, it will not have any effect. In addition, in such a power line utilization system, since the time from when the transmitter 10 sends out a load control signal for each receiver to when it sends out a load control signal for the next receiver is long, the load control time is Even if it is delayed, it will not be caught while the next load control signal is being sent.

(g) Effects of the Invention As explained in detail above, according to the present invention, there is an effect that the receiver can receive the load control signal without being affected by noise when the load is turned on and off.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a power line utilization system, Fig. 2 is a block diagram of a conventional receiver, Fig. 3 is a time chart of the operation of each receiver when the receiver of Fig. 2 is used, and Fig. 4 is a block diagram of a conventional receiver. The figure is a block diagram of a receiver according to an embodiment of the invention. In the figure, 1 to n are receivers, 1-a to na are loads,
SW1 to SWn are switches, 10 is a transmitter, 11 is a signal detection section, 12 is a load control section, 13 is a delay circuit, and 100 and 101 are lamp power lines.

Claims (1)

[Claims] 1. In a power line utilization system in which a transmitter that transmits load control signals in series and multiple receivers that receive multiple loads and load control signals and control each load are connected to the same power line, each A load control method characterized in that load control of receivers is delayed until all receivers finish receiving load control signals.