JPS5857829A - Power line data transmitting system - Google Patents

Abstract

PURPOSE:To perform transmission among transmission modules widely distributed by means of a transmission module of a small output, by operating the transmission module also as a repeater. CONSTITUTION:Transmission modules 1-1-5-6 located in houses are respectively connected to a power line, which is used as a transmission line. When the transmission modules 1-1-5-6 receive a signal of prescribed data format, they transmit the same data sequentially in the succeeding timing. The data transmitted at the 1st transmission module 1-1 is transmitted at the modules 1-1, 1-2, 2-1 and 2-2 in the succeeding timing, the transmission output is increased to attain a long-distance transmission. In the next timing, further more transmission modules perform transmission, resulting in that all the modules perform the transmission finally. Thus, the output of each transmission module can not be made larger.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for transmitting data using power lines.

BACKGROUND ART Systems in which a large number of sensors and actuators are widely distributed are being actively developed, such as gas centralized monitoring systems in apartment buildings. In that case, information is centrally collected at the center and an alarm etc. is issued.

From a cost perspective, the most advantageous method is to superimpose data onto a power line rather than constructing an independent data dedicated line. However, various devices are randomly connected to power lines. In particular, when equipment with low impedance relative to the carrier frequency, such as a fluorescent lamp with a high power factor capacitor or a high-power electric heater, is connected to a power line, the signal level drops rapidly and transmission becomes impossible.

The present invention provides a method for solving the above problems by effectively utilizing a transmission module having the minimum required transmission output.

Figure 1 shows a model in which sensors and actuators are placed in each apartment in a condominium and are controlled and monitored at a central location. The figure shows a five-story building with six units per floor. −
1 is a transformer that converts 3-phase 6600V to single-phase 8-wire 100V, 2 is a trunk main breaker, 3 is a trunk sub-breaker, and 14 is the electrical system in each dwelling unit. (In m-n, turtle is 70 wa, and T is the house number on the floor). As shown in the figure, it is common to run a sub-main line vertically to each dwelling unit, and from there branch to each dwelling unit.

The electrical system in each dwelling unit 4 is shown in Figure 2. 10 is an integrated wattmeter, 11 is a main breaker, and 112 is a sub-breaker, through which electricity is supplied to various electrical appliances.

Examples of the present invention will be described below. It is assumed that a transmission module is installed in each house in FIG. When transmitting between transmission modules 1-1 and 5-6, if heavy-load appliances are used in all units in an apartment complex, the transmission module must be expensive to enable direct transmission. Transmission power is required and cannot be easily achieved. However, it is possible to easily obtain a transmission output that can be received by the transmission modules in the upper, lower, left, and right housing units. For example, if 1-1 is the transmission source, 1-2.2-1.2-2 can easily receive data. And even in this case, 1
-8. 1-4. 1-5. ]-6, it is assumed that the transmission power was insufficient for correct reception.

As shown in FIG. 3, when a signal of a predefined data type is received, the same data is sequentially transmitted at subsequent timings. If this is done, the data initially transmitted as 1-1 will be transmitted as 1-1 at the subsequent timing, for example.
1-2. 2-1. 2-2, and the higher the transmission power, the farther it will reach, and then the I
-1,1-2゜1-3. 1-4. I-5, 1-6
,2-1,2-2,3-1,8-2,4-1,4-2,
5-1°, 5-2, and finally transmitted by all transmission modules. Figures 4 (1) to (4) show this situation, with diagonal lines indicating transmitting dwelling units. In reality, the derosene of (4) in which all the dwelling units are in the transmitting state is not necessary, and the signal can be received in 5-6 in the transmitting state up to (3). In other words, data transmission between 1-1 and 5-6 is possible using any transmission module between them as a repeater despite the presence of a heavy load. The actual state of data propagation varies depending on the load on the power line.
). However, in general, even considering the case of heavy loads, it is sufficient that n (number of transports) in FIG. 3 is 3 to 4. However, in order to prevent the same data from being transmitted indefinitely, it is necessary to be able to identify which number of poems n corresponds to in the progression of φ, 1, 2, and to specify the -transmission unit.

The above is a case where so-called time division multiplexing is used, in which data is received sequentially from a location close to the transmission module, and the same data is transmitted at the same time to increase the transmission output with equal constraints, and the power line is overlapped with respect to the carrier frequency. This has the advantage of enabling highly reliable transmission even when a load is connected.

In addition to the above, although the number of relays increases, it is also possible to perform transmission between desired modules by sequentially sending controlled data from the original transmission source to adjacent transmission modules. Furthermore, multiplexing may be performed by time division or by division of the number of waves of other stations.

As described above, the present invention enables highly reliable transmission between any widely distributed transmission modules by effectively utilizing transmission modules with the minimum necessary transmission output, and is an eleventh invention. Provides a power line data transmission method.

[Brief explanation of drawings]

Fig. 1 is a model diagram showing an embodiment of the present invention, Fig. 2 is an electrical system diagram of the capacitive door shown in Fig. 1, Fig. 8 is a diagram explaining the timing of transmission and reception, and Figs. 4 (1) - (4) is a schematic diagram showing the state of transmission. 2... Trunk line main breaker - 13... Trunk line sub breaker - 1, 4... Each dwelling unit. Agent Patent Attorney Aihiko Fukushi (1) (2) (3) (4) Figure 4 Procedural Amendment (Method) 1. Indication of Case Patent Application No. 1983-157164 2. Name of Invention Power Line Data Transmission Method 3 , Relationship with the case of the person making the amendment Patent applicant 4, agent and above

Claims (1)

[Claims] 1 In systems that use power lines for data transmission,
It has a large number of widely distributed transmission modules, and is characterized by using another transmission module /L' interposed between them as a data repeater for transmission between any two transmission modules. Power line data transmission method.