JPS5961342A - Power line carrier receiver - Google Patents

Abstract

PURPOSE:To attain a power line carrier receiver decreased in the effect of the delay produced at a BPF, by extracting each frequency of an FSK signal at the BPF, detecting an extracted signal and comparing them with each other. CONSTITUTION:Signals having respective frequencies fA, fB are transmitted from a transmitter A to data ''1'', ''0''. The frequency fA, fB components are extracted from the received sgnal at BPFs 6, 6' at a receiver B, and the extracted signal is detected at AM detectors 7, 7'. The detected signal is compared mutually at a level comparator 8, and the output of the comparator 8 is discriminated at a data discriminator 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power line carrier/receiver device used in a power line carrier system in which a high frequency I-mark is superimposed on a signal transmission path made up of power lines to transmit and receive data.

In conventional power line equipment transmission/reception (g equipment), the delay time shown in Figure 1 (a) occurs at the falling edge of the received waveform due to the influence of the narrow band filter installed in the receiving section.
As shown in b), the waveform shaping output also has a delay time,
For this reason, there was a problem in that the power per unit time of the signal wave superimposed on the phase power supply frequency was limited, and the speed of one signal transmission could not be increased.

In view of the above points, this was provided.
ft
The purpose is to provide a transmitter/receiver with power=te.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a block diagram including the transmitter A side of the first embodiment of the present invention, in which (1) is an oscillator that generates a signal of frequency fA, and txt' is an oscillator that generates a signal of frequency fb. It is. (2) is a transmission signal fJJ switch which controls whether to send the fA signal or send No. 48 of f,+3 using the output signal of the data f switch (3). Also, (4) is a transmitting signal intensifier, and (5) is a transmitting driver.
(+4) and the direct current power line. Next, in receiving device B, (61 is a narrow 41) band filter for passing the signals -1j and fA, and similarly, (6)' is a narrow band filter for passing the signal fB. Also, (7) and +7+'t receiver (each narrowband filter +61 of S belief)
(It is an A M 492 device that detects the output of 6/,
(8) is a level comparator that compares the output levels of the AMM waveformers +7) +71' and outputs a "H" or "L" signal. Furthermore, it is a data 'I'lJ distinguisher for determining the data content of the transmitted value based on the signal state of ``H'' and ``L'' of the 0 level signal input device (8). In the embodiment shown in FIG. 2, the -01 oscillators +11 and (1)' in the transmitter A constantly oscillate at the frequency fA1fB.The load control commands input manually and automatically is converted by the data converter (3) into a signal corresponding to "1'/%g" as shown in Fig. 3(a), which is then controlled by the transmission signal switch (2), and the command is A frequency signal like the one shown in the figure (b) corresponding to the data is sent to the intensifier (4) and the transmission driver (
5), it is superimposed on the commercial line (14). Next, in the receiving device B, the transmitted signal is received from the commercial #N141 by a narrow band filter +6116+' for each frequency fA fB. At this time, due to the characteristics of each narrowband filter + it) t6r, the same figure (C) and (
As shown in d), the other frequency signal will also be passed a little, and these narrowband filters ill (6
Due to the influence of the Q of the coil at 1, etc., a delay time as indicated by 0 in the figure occurs at the falling edge of the received waveform. Conventionally, data of "1z"0" was expressed by the presence or absence of a signal using a single frequency, so this delay time became a problem as shown in Figure 1 above, and it was necessary to shorten the time interval and increase the transmission speed. However, in this dual-frequency embodiment, the outputs from the narrow band filters (6) (6)' are converted to AM detectors f7+ +7)', respectively.
By detecting the waves and obtaining outputs as shown in Fig. 3(e) and (f), and comparing the voltage levels with the level comparator (8), the voltage level shown in Fig. 3(g) is obtained. The data discriminator (12) is used to obtain a corresponding output, and use the data discriminator (12) to discriminate the transmitted data.Accordingly, if you do the following, the falling edge of the AMM wave output will be more sensitive to the falling edge of the received waveform. Since it is sharper than the lower part, the delay time is reduced to the middle part, and the period (2) in Figure 3 Ig)
indicates the shortened delay time.

FIG. 4 shows a second embodiment of the tree J,
This circuit further improves the functionality of the circuit of the embodiment shown in FIG.
In addition to the same circuit parts (assigned with the same numbers) as in the embodiment 7 shown in FIG.
L” signal to the 9th order link circuit (1o)
A passing signal selection circuit (9) as shown in the concrete circuit example of FIG. 5 for controlling whether to send signal A or signal fn, and a tie-3-/ji-generating circuit (eg, outputted by Maikosi etc.). ]
(The counter circuit part is controlled by the signal from the river and counts the number of pulses of the human input signal within a certain period of time, and the waveform shaping circuit converts the received 48 signals of a certain value or more into a rectangular wave.
al(I萄′ etc. are added.

Thus, in the embodiment of FIG. 4, the output of each narrowband filter f6+
+3) to convert to a square wave, while the level comparator (8
) The output is used as a control signal. 10 Switch whether to pass the output of the waveform shaping circuit (13) or (13) as shown in Figure 3 (h) or (f) as shown in Figure 3 (j). A passing signal selection circuit (9) is provided, and the number of pulses at each fixed time is counted by a link using a timing signal output from a timing generation circuit (++) generated from a microcomputer, etc., and depending on the number, it is determined whether it is fA or fB! l'lJ 1Or
k and determines the transmitted data. In this way, even if instantaneous noise etc. mixes into the signal wave, causing partial distortion in the AMM waveform, etc., and the level comparator (8) output oscillates instantaneously, the number of pulses within a certain period of time will There is almost no error in counting fA% fB! 14J is definitely mouth If1t! , it becomes.

As mentioned above, Kinoe Kazutoshi extensively performed AM detection on the output of a pair of narrowband filters and compared these AM detection detection outputs to discriminate data, so the falling delay time due to the narrowband filter This has the effect of making it possible to shorten the time and increase the transmission speed.

[Brief explanation of drawings]

FIG. 1 is a diagram 11 of a conventional example, FIG. 2 is a block diagram of a first embodiment of the present invention, and FIG. 3-1 is an explanatory diagram of the same operation.
Figure 4 is a block diagram of the second embodiment of 5g5
The figure is a detailed block diagram of the passing signal selection circuit same as above.
+61161' is a narrow band filter, +7+ +71' is an AM detector, (8) is a level comparator, and (9) is a pass signal selection circuit. Agent Patent Attorney H.L. Ai Shichi 7. Commissioner of the Patent Office 1. Incident display W'r '44157 typemochi1ffliliuils1
7194092, Name of the invention: Power line carrier/receiver device 3, Relationship with the person making the amendment Patent applicant: 1048 Kadoma, Kadoma City, Osaka Name: (583) Matsushita Electric Works Co., Ltd. Representative: Iku Kobayashi 4, Agent Person postal code 530 5, Date of amendment order Vol. 6, Stop - Yen application mixed number, Patent application No. 171940, 1983, 1, Fudo/Kaiyo punishment I yen @ 'j 6 mor 2 I] eye I l + 31 (61 J
f: r t61161' and 6J stop. 2. Same position 211th I C131 + 131 J + 131 + 131 ' J and Kl will stop. ;3. 1 (h) and (f) J on the 14th line of “Same”
'cr (b) or (i)'' and 61 city greetings. 4. Same-L times 51)th ((131 and (131)
Jτ1 (131 and t131'J and Pa) will stop. 5. Mokuutazoe Kyouchu Fig. J3

Claims (1)

[Claims] The ill signal is transmitted as a two-frequency switching signal according to the internal world of the data, and a pair of narrow band filters respectively adapted to the respective frequencies of these transmitted ID signals are provided. A power line carrier/receiver apparatus characterized in that the outputs of the narrowband filters are subjected to AM detection using AM detectors, and the outputs of these AM detectors are compared using a level comparator to discriminate data. (2) Waveform shaping the outputs of the narrowband filters, inputting the waveform shaping signals to a pass signal selection circuit controlled by the output of the level comparator, and controlling the number of pulses of the output of the pass signal selection circuit for a certain period of time. 2. The power line carrier receiving device according to claim 1, wherein data is discriminated by counting each time.