JPS6118321A - Lamp line carrier signal transmitter - 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 Field of Industrial Application The present invention relates to power line carrier signals for monitoring and controlling various equipment and loads using power lines in homes, shops, buildings, offices, factories, etc. as signal transmission paths. This relates to a transmission device.

Conventional configuration and its problems Electric light lines for homes, shops, small buildings, offices, etc. are branched off from the electric power company's pole transformer, and are connected to multiple light consumers such as households to supply electricity. There is. Generally, a plurality of consumers are connected to one pole transformer. Therefore, when using a power line as a signal transmission path, the following five problems must be solved.

(1) Multiple electric light consumers are connected to one pole-mounted lance. Therefore, it is necessary to isolate each customer as a signal system so that the signals and load fluctuation noise do not affect each other.

G2) Even when the signal system is limited to one consumer,
The signal transmission characteristics change due to load fluctuations within the consumer.

(3) Even when the signal system is limited to one consumer,
There is unspecified noise generated by equipment used within the customer. In particular, the number of devices using switching power supplies and inverters is increasing, and the number of noise sources is also increasing.

(4) The signal frequency must not adversely affect existing equipment such as radio receivers, television receivers, and wireless intercoms.

(5) Measures must be taken to prevent leakage of high frequency signals to areas other than the signal system in order to satisfy the standards of electrical equipment technical standards.

Regarding the above item (2), the explanation is omitted as it is a problem of signal frequency and is outside the scope of the present invention.

Regarding items (1) and (5), a block filter is installed at the power line inlet of the customer to prevent the power line carrier signal from leaking outside the customer and to prevent it from leaking to other customers outside the customer. This prevents the inflow of noise and prevents signal fluctuations due to load fluctuations of other customers.

Regarding item (3), as mentioned in each item, recent load equipment has a carrier signal frequency (for example, 12
5 KHz), and 55
Noise below 0 KHz tends to increase.

It is only necessary to change the signal level due to the fluctuation of the signal due to the load fluctuation and the increase in the number of low impedance devices for the signal.

However, if the signal power is increased, the cost of the signal generator increases, and at the same time, the signal blocking level of the block filter must be set high to suppress high frequency signals leaking outside the consumer, which also increases the cost of the block filter.

Purpose of the Invention The purpose of the present invention is to reduce the noise in the signal transmission path and improve the signal transmission efficiency by attaching it to a low impedance device for signals and a noise generating load to block the impedance to the signal and the noise flowing into the power line. This paper proposes a device to do this.

Structure of the Invention Therefore, the present invention has a structure in which a block filter for preventing the high-frequency signal from leaking to the outside of the lead-in port is inserted into the lead-in port of the electric light line that transmits the high-frequency signal, and the block filter has a low impedance to the high-frequency signal. A load and a high-frequency noise generating load are connected to the power outlet of the light line via an impedance upper which has a high impedance with respect to the high-frequency signal and prevents high-frequency noise of the load from flowing into the light line.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a controller for domestic appliances in which a domestic power line is used as a signal transmission path. 1 and 2 are limiters and earth leakage breakers at the power line inlet, and 3 is a block filter that limits the signal transmission path to the inlet. This prevents signals inside the home from being affected, and also prevents signals inside the home from leaking outside the home. It has the function of transmitting signals to the 20OV system, and its characteristics are shown in Figure 2. 4 is a branch breaker. Figure 1 shows that the branch breaker is 1.
Although the electric light line is written assuming that there are 4
~6 branch breakers are used, and the signal lines are separated along these branch breakers. 5 is the electric light line in the home, which is a signal transmission line.

6 is a controller for household equipment. 7 is a terminal device that judges the signal sent from the controller and inputs it.
8 is an impedance amplifier whose function is to increase the impedance in response to the signal frequency and to prevent noise from each load device from flowing into the power line. Figure 3 shows the characteristics of the impedance upper.

Further, FIG. 4 shows the noise level of the electromagnetic cooker, and FIG. 6 shows the reduction in noise when an impedance upper is connected. Therefore, by connecting this antenna, it is possible to block the noise flowing into the power line. Also, the equivalent circuit of the impedance for the signal of each load equipment and the actual measured value of the signal impedance when the signal frequency is 125 KHz are as follows. It is shown in the table below.

Below is a blank table: Equivalent circuit of home appliances when energized 1 As can be seen from this table, vacuum cleaners, air conditioners, and electromagnetic cookers have low impedance, and the signal power is absorbed by devices with low impedance, as shown in Figure 1. In the example, the signal from controller 6 is absorbed by the vacuum cleaner or air conditioner,
Levels with electric blankets are extremely low. To prevent this, an impedance upper 8 is inserted to increase the impedance to the signal.

By the way, by connecting a low impedance device to an outlet via an impedance upper in a home with 120 d, the maximum attenuation for the signal can be reduced to 40 d.
It has become possible to improve the noise level from B to -29 dB.

Effects of the Invention According to the present invention, by connecting a low impedance load and a high noise generating load via an impedance upper, it is possible to reduce noise in a signal transmission system of a power line and suppress signal fluctuations due to the load. By making the signal system for power line transportation stable, it is possible to reliably control and monitor the use of power lines.

Further, by employing this impedance assignor/I#, the signal level can be reduced, and the cost of the signal generating section of the controller and terminal device can be reduced.

[Brief explanation of the drawing]

Figure 1 is a transmission circuit diagram of a controller for household equipment using domestic power lines as a signal transmission path, Figure 2 is a frequency characteristic diagram of signal attenuation, Figure 3 is a frequency characteristic diagram of impedance, and Figure 4 is a diagram of frequency characteristics of impedance. Both FIG. 5 and FIG. 5 are frequency characteristic diagrams of the noise level. 3...Block filter, 6...Transmission line, 7...Terminal device, 8...Impedance upper. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (1)

[Claims] A block filter that prevents the high-frequency signal from leaking to the outside of the lead-in port is inserted into the lead-in port of the electric light line that transmits the high-frequency signal, and a load with low impedance and a high-frequency noise generating load for the high-frequency signal are connected to the high-frequency signal. A power line carrier signal transmission device connected to an outlet of the power line via an impedance upper which has a high impedance and prevents high frequency noise of the load from flowing into the power line.