JPH0335623A - Carrier signal coupling circuit for distribution line - Google Patents

Abstract

PURPOSE:To miniaturize a transmission device and to make it tightly sealed structure by constituting the circuit by means of a connection filter in which a primary coil and a secondary coil are respectively wound to both legs of a tripod magnetic core and a central leg is set to be a leakage shunt so as to adjust a connection coefficient. CONSTITUTION:Two pairs of E cores 21 are combined so that tripod legs face each other, for example, and gap members 24 and 25 are inserted between them. Then, the primary coil 22 and the secondary coil 23 are wound to both legs of the tripod magnetic core. The number of magnetic fluxes passing through the center leg in accordance with the size of the gap length of the center leg being the leakage shunt changes and accordingly the coupling degree of the primary coil 22 and the secondary coil 23 becomes large when the gap length of the center leg is large. Then, the coupling degree of the primary coil 22 and the secondary coil 23 becomes small when the gap length of the center leg is small so as to adjust the coupling coefficient. Thus, the transmission device can be miniaturized and it can be made into a tightly sealed structure.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a coupling circuit for carrying power distribution lines.

Conventional technology The distribution line carrier method uses the metal circuits of distribution lines to transmit voltage or current signals between the power source end and the load end.
or 601-1z) Buttons, their harmonics, and various other unnecessary noises are present in distribution lines, so injecting a voltage or current signal into a distribution line requires a low impedance, signal For frequencies other than the above frequency, it is necessary to use a high impedance filter.

Further, when an FSX-modulated voltage or current signal is injected into the distribution line, the filter needs to be a bandpass filter that has low impedance only in the signal frequency band.

Conventionally, a coupling circuit shown in FIG. 6 is used as this type of filter, and the sharpness of the single peak characteristic as shown in FIG.
I was adjusting it.

In FIG. 6, 41 is an inverter, 42 is a capacitor, 43 is a reactor, 44 is a resistor, and 46 is a signal injection transformer.

In addition, in FIG. 7, fo is the carrier frequency, fL
and fu is the signal frequency.

Problems to be Solved by the Invention In such a conventional coupling circuit, the signal injection transformer 4
If there is a variation in the impedance of 6, the center frequency 10 (carrier frequency) of the single peak characteristic will vary, and as a result,
A difference occurs in the signal injection level of the two frequencies of the FSK modulation signal, that is, fL (frequency lower than fo) and frequency higher than fHcfo, and the level difference is large due to overlap with the transmission characteristics of the power distribution system. (For example, the signal level at /H is 1, while the signal level at 7L is 2 or more)
However, there was a problem in that the signal receiving end could not correctly receive and judge the signal.

Further, the resistance 44 of the coupling circuit generates heat due to the signal current,
This was an obstacle to the compact and sealed structure of the transmitter.

The present invention solves these problems, and uses a coupling circuit that can easily adjust the required passband width to maintain the signal injection level at fL and f even with slight variations in the signal injection transformer. By making the difference relatively small, determining the normal reception of the signal at the signal receiving end, and eliminating the resistance of the coupling circuit, we can suppress heat generation and make the transmitter compact and sealed (1
The purpose is to make it a four-story building.

Means for Solving the Problem In order to solve this problem, the present invention uses a loosely coupled reactor in which a primary coil and a secondary coil are wound around both legs of a tripod magnetic core, and the central leg is used as a leakage shunt. This is a coupling circuit consisting of a coupling filter whose coefficients can be adjusted.

Effect: With this configuration, the required passband width can be easily adjusted by adjusting the coupling coefficient of the coupling circuit.

Embodiment FIG. 1 shows a distribution line carrying coupling circuit according to an embodiment of the present invention, in which 1 is a capacitor, 2 is a loosely coupled reactor, 3 is a capacitor, and 4 is a signal injection transformer.

A resonant circuit is formed by the capacitor 1 and the loosely coupled reactor/I/L2, a resonant circuit is formed by the capacitor 3, the loosely coupled reactor/LzL1, and the short-circuit impedance of the signal injection transformer 4, and the two resonant circuits are They are coupled at the mutual inductance west of the coupling reactor 2 to form a coupling circuit. The distribution line carrier method uses metal circuits on distribution lines to transmit voltage or current signals between the power supply end and the load end.
t (zt 60 tons), its harmonics, and various other unnecessary noises are mixed in the distribution line, so in order to inject a voltage or current signal into the distribution line, it is necessary to It is necessary to interpose a filter that has low impedance and high impedance for frequencies other than the signal frequency. Furthermore, when injecting FSX-modulated voltage or current signals into the distribution line, the filter is It is necessary to use a bandpass filter that has low impedance only in the signal frequency band as shown in FIG.

As is well known, in the coupled tuned four-way circuit shown in FIG. 1, the relationship between the coupling coefficient of the coupling circuit and the sharpness Q gradually becomes wider as the Kth page increases from the K<,. Therefore, a bandpass filter having an arbitrary passband width can be realized by adjusting the coupling coefficient of the coupling circuit. FSK signals used in this distribution line transportation system are 270±10 and 450-11.
6) IZ, and optimal bandpass filter characteristics can be obtained when the coupling coefficient of the coupling circuit is about 0.2.

The coupling coefficient of the coupling circuit is equivalent to the coupling coefficient of the coupling reactor 2 on the west side of mutual induction, and it is sufficient to realize a loosely coupled reactor with a coupling coefficient of about 0.2.

When a primary coil and a secondary coil are wound around both legs of a tripod magnetic core as a loosely coupled reactor, and the central leg is used as a leakage shunt, the coupling coefficient is about 0.3.

Therefore, in order to realize a coupling coefficient of about 0.2, it is necessary to employ various configurations described below.

In the first specific example, as shown in FIG. 4, two sets of E-cores 11 are combined so that the tripods face each other, gap members 15 and 16 are inserted between them, and the primary The coil 12 and the secondary coil 13 are wound, and the compensation winding 14 is further wound on the secondary coil 12, and the primary coil 12 and the compensation winding 14 are connected to form a substantial primary coil. The compensation winding 140 winding is approximately 10% of the number of turns of the upper winding @ (in this case, the primary coil 12), and the connection is made with the same polarity or opposite polarity to the main winding 12 to connect the primary coil 12 and the secondary coil. coil 1
The degree of coupling of 3 can be adjusted. In addition, compensation winding 1
4 may be wound on the primary coil 12 and connected to the secondary coil 13 to serve as a substantial secondary coil.

The second specific example includes two sets of E cores 2 as shown in FIG.
1 are combined so that the tripods face each other, cap members 24 and 25 are inserted between them, and a primary coil/I/22 and a secondary coil 23 are wound around both legs of the tripod magnetic core, respectively. The number of magnetic fluxes passing through the center leg changes depending on the gap length of the center leg, which becomes a leakage shunt, and as a result, when the gap length of the center leg is large, the combination of primary coil/L/22 and secondary coil/v23 increases. When the degree of coupling becomes large and the gap length of the central leg becomes small, the degree of coupling between the primary coil 22 and the secondary coil 23 becomes small, and the coupling coefficient can be adjusted.

A specific example of M3 is a method in which the number of magnetic fluxes passing through the center leg is changed by changing the cross-sectional area of the center leg, which becomes a leakage shunt, with the same configuration as in FIG. By increasing the cross-sectional area of the central leg, the degree of coupling between the primary coil 22 and the secondary coil 23 becomes smaller, and the coupling coefficient can be adjusted.

Effects of the Invention As described above, according to the present invention, in a coupling circuit for carrying a distribution line, a coupling circuit that can inject a stable FSX signal into the distribution line with less influence from variations in the signal injection transformer is a loose coupling reactor. By easily changing the coupling coefficient of , the required passband width can be secured, and since there is no resistor, which is a heat source, it is possible to create a compact, hermetically sealed transmitting device.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a coupling circuit for distribution line carrying according to an embodiment of the present invention, Fig. 2 is a characteristic diagram showing bandpass filter characteristics, and Fig. 3 is a diagram showing the coupling coefficient and sharpness Q of the coupling tuning circuit. Figure 4 is a cross-sectional view showing a loosely coupled reactor whose coupling coefficient can be adjusted by a compensation winding, Figure 5 is a 4S shunt for the center leg of the tripod core, and the leakage magnetic flux of the center leg is separated by a gap. FIG. 6 is a circuit diagram of a conventional coupling circuit for carrying distribution lines, and FIG. 7 is a characteristic diagram showing the unimodal characteristics of the conventional coupling circuit. 1.3... Capacitor, 2... Loosely coupled reactor, 4... Signal injection transformer, 11
．． 21...E core 12.22...Primary coil, 13.23 Secondary coil, 14...Compensation winding,
16,16゜24.26...Gassob member.

Claims (1)

[Claims] (1) In a coupling circuit of a signal injection device for power distribution line carrying,
A coupling circuit for power distribution line conveyance, comprising a primary coil and a secondary coil wound around both legs of a tripod magnetic core, a loose coupling reactor with the center leg as a leakage shunt, and a coupling filter configured to adjust the coupling coefficient. . (2) The coupling circuit for power distribution line conveyance according to claim 1, characterized in that a required passband width is obtained by correcting the coupling coefficient. (3) The coupling circuit for power distribution line conveyance according to claim 1, characterized in that a compensation winding is provided in a part of the magnetic path of the loosely coupled reactor, and the coupling coefficient is adjusted by adjusting the number of turns. (4) The coupling circuit for power distribution line conveyance according to claim 1, wherein the coupling coefficient is adjusted by adjusting the gap length of the center leg leakage branch of the loosely coupled reactor. (6) Claim 1 characterized in that the coupling coefficient is adjusted by adjusting the cross-sectional area of the central leg leakage branch of the loosely coupled reactor.
The described coupling circuit for carrying distribution lines.