JPS60219929A - Indoor load controller utilizing power wire - 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 (a) Industrial Application Field The present invention relates to an indoor load control device that transmits and receives control signals using a power line, and particularly relates to a device that adjusts the reception sensitivity of a receiver to the noise level on the power line. (b) Prior art In general, conventional indoor load control equipment consists of a transmitter that sends a control signal over a power line, and a receiver that receives the control signal sent over the power line. There was one described in Japanese Unexamined Patent Publication No. 57-37.

This publication described something like the one shown in Figure 1. This figure is an electrical circuit diagram of the main part of the transmitter/receiver that superimposes the K control signal on the indoor power line (1) or receives the control signal from the indoor power line (1), and (2) in the figure shows the pulse coded control signal. The output control section (3) is a high frequency oscillation circuit, which modulates a high frequency wave serving as a carrier wave with a control signal from the control section (2).

(4) is a coupling circuit, which consists of an output transformer (5) and a transistor (6). (7) is a reception amplification circuit, which inputs the ill signal superimposed on the indoor power line (1) via the coupling circuit (4), amplifies it, and outputs it to the control unit (2). Note that (8) is a commercial frequency clock detection circuit.

When such a transceiver is used, the control section a (2) inputs the control signal superimposed on the indoor power line (11) via the coupling circuit (4) and the amplification circuit (7). The degree of amplification of this amplification circuit (7) was determined based on the distance on the indoor power line (1) between the transceivers that exchange control signals with each other.When the distance is long, attenuation of the control signal is taken into account. (However, when the distance was short, the degree of increase, or reception sensitivity, was made small, taking into account the saturation of the control signal. However, when noise was mixed in the indoor power line +11, the reception sensitivity was increased.) When set to a large value, the control section (2)
There were cases where the receiver confused noise and signal and received the signal, resulting in malfunction.

(c) Purpose of the Invention In view of the above problems, the present invention provides an indoor load control device that suppresses the reception of erroneous signals by changing the receiving sensitivity based on the noise level mixed into the power line.

B) Structure of the Invention The present invention provides an indoor load control device using a power line, which includes a transmitter that sends a control signal over the power line, and a receiver that receives the control signal sent over the power line. This device includes a noise detection unit that detects the noise level of the noise detection unit, and a reception unit that can change reception sensitivity based on the output of the noise detection unit, thereby preventing reception of erroneous signals due to noise.

(e) Examples Examples of the present invention will be explained based on FIGS. 2 to 5. (9) is an indoor power line, 0α is an outlet connected to the indoor power line (9), and αυ is a power supply circuit. , outputs a DC voltage (+V, , ). OQ is a capacitor and a transformer that constitute a coupling circuit. QCl
(+51 is a capacitor and a resistor that make up the filter. 0e is a Zener diode that cuts the peak value of the received signal. The output is a comparator, and together with the ladder resistor α and reference resistor 09, it constitutes the receiving section. (2)
) is a control unit that controls the indoor load based on the received signal, and is also equipped with an internal noise detection unit configured using software. In addition, the terminal (Do) is a data input terminal, the terminals (D, ) to (D4) are output terminals to the ladder resistance 0 mark, and the terminals (AO) to (A7) are the i+11 of the indoor load.
It is for 1m output.

The control section (2G) performs the following operations based on the flowchart in FIG. 3. When the operation is started by first turning on the power, the receiving section initially operates with maximum sensitivity (MAX). The sensitivity of this receiving section is determined by the reference voltage given to the comparator C17), and this reference voltage is determined in 16 steps based on the output given by the control section 2 to the ladder resistor (IEilK).The comparator (Iη is the level of the received signal When exceeds the reference voltage level, an H level voltage is output to the terminal (Do) of the control unit (■).In other words, high sensitivity means that the reference voltage level is low and even a low H level voltage can be recognized as an H level. .

Furthermore, the form of the control signal used in the device of the present invention is “HEA”.
DER signal (4 bits), 1 address signal (4 bits) used to distinguish between multiple receivers, data signal (4 bits), parity signal (lbit),
END signal (4 bits)" is output serially. When the sensitivity of the receiving section is at its maximum, it is determined whether the terminal (Do) of the control section +2 (11) has an H level voltage or not.

The time when the H level voltage is up to the timer (approximately 4b)
If it is maintained (time during which it can receive serial data), the sensitivity of the receiving section is considered to be too high, and the sensitivity of the receiving section is lowered by one step. This operation is based on the fact that when the reception sensitivity is high, the output of comparator Q71 always becomes an H level voltage due to the noise level, as shown in Figure 4(b). The sensitivity of the receiver is lowered step by step (that is, the reference voltage is raised). When the L level voltage is output, the sensitivity is further lowered by one step as shown in Figure 4 (cl). After setting the sensitivity to “HEADE”
It waits for the reception of the R signal.” HE ADER
When the signal ``is received, the following 6 address signals'', ``data signals,'' etc. are sequentially received, and the indoor load is controlled based on these signals. If there is no ``HEADER signal'' within ``bit minutes x 2 hours'', increase the sensitivity of the receiver by one step, detect the level of the terminal (Do) of the control unit again, and repeat the above operation again. This is used to set the sensitivity of the receiving section.

A case in which the control unit (2) which operates as described above is actually used will be explained based on FIG. 5. Figure 5 (al is comparator 07)
The state of the signal input to the non-inverting input terminal of , Fig. 5(b)
represent the output status of the comparator (In).At the start of operation, the sensitivity of the receiver is too high, so the output of the comparator αD remains at H level voltage.After this, t3, t! and time The sensitivity decreases as time passes, and when the sensitivity exceeds the noise level, it waits for the reception of the "HEADER signal".

After this, if the "HEADER signal" is received, continue (.

It receives 6 address signals, 1 data signal, etc. to control indoor loads.

As described above, by using the present invention, the sensitivity of the receiving section (that is, the reference voltage used in the comparator) can be optimally set at a position higher than the normal pressure noise level. Therefore, even if the distance on the indoor power line (9) is long and the node (1) signal is attenuated, it can be received with optimal sensitivity.

In the above embodiment, the sensitivity of the receiver is set to 16 levels, but the sensitivity is not limited to this and may be changed to two or more levels or continuously.

Furthermore, in the above embodiment, the noise level was detected using the software in the control unit, but this is not a trivial matter; for example, only the noise component is detected using a filter circuit, etc., and based on this detection output. Alternatively, the sensitivity of the receiving section may be changed.

(f) Effects of the Invention As described above, the present invention provides an indoor load control device using a power line, which includes a transmitter that sends a control signal over the power line, and a receiver that receives the control signal sent over the power line. The receiver is equipped with a noise detection section that detects the noise level on the power line, and a reception section that can change the reception sensitivity based on the output pressure of this noise detection section. The sensitivity can be set high, and the control signal can be reliably received even when the power line is long and the control signal is attenuated.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of a device showing a conventional example of the present invention;
The figure is an electric circuit diagram of a device showing an embodiment of the present invention, and FIG. 3 is a T70-chart diagram showing the operation of the control section shown in FIG. 2.
Figure 4 is an explanatory diagram showing the form of the signal used in Figure 2;
The figure is an explanatory diagram showing the operation when the embodiment of FIG. 2 is used. (9)...Power line, (171...Comparator, 0sa...Ladder resistance, (19...Reference resistance, ■...
control section. Applicant: Sanyo Electric Co., Ltd. and one other representative: Shizuo Sano, patent attorney Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1.1 In an indoor load control device using a power line, which consists of a transmitter that sends a control signal over the power line and a receiver that receives the control signal sent over the power line, the receiver is configured to detect the noise level on the power line. 1. An indoor load control device using a power line, characterized by comprising a noise detection section that detects noise, and a reception section that can change reception sensitivity based on the output of the noise detection section.