JPS60170427A - Block filter - 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 a block filter for a power line carrier control device that superimposes a carrier signal on a power line and monitors and controls load equipment.

(Configuration of a conventional example and its problems) The configuration of a power line transfer control device is shown in FIG. 1, taking a single-phase three-wire system as an example. That is, single-phase three-wire power lines U, N
, V 100V each (U-N and V-N) and 2
Connect the controller (device) 2, load devices t1 to t5, and slave devices 3 to 7 to 00V ((J-N), and superimpose a carrier signal on the power line between the device 2 and slave devices 3 to 7. The device 2 performs bidirectional communication to monitor and control the load devices t1 to t5.In this power line carrier device, the block filter 1 is a high impedance circuit for the carrier signal frequency f. and low impedance circuits z2U and Z2v, which prevent the carrier signal from leaking to the outside (power supply side) of the block filter 1.Z51JIZ3v is a circuit that transmits the carrier signal to other phases. In FIG. 1, communication is possible not only between Oyahan 2 and No. 3 to 4, but also between Oyahan 2 and No. 5 to 7.

A conventional example of such a block filter is shown in FIG.

Zl connected in series to each of the power lines described above is a blockage wire L1.
Z2 connected between each phase corresponds to a series resonant circuit of inductor L and capacitor C2, and Z3 corresponds to a series resonant circuit of inductor L3 and capacitor C3. do. L2U
9 L2V l ”30 e Since L3V are all variable inductors, it is possible to adjust the resonance frequency by trimming them, and it is possible to correct variations in capacitors C and C, but in the 2U 2V high impedance Z1 element, Streamline ring.

Since a large current of several 1 OA flows from the commercial power supply, its configuration is as shown in Figure 3, which is a ferrite coil 8 wound with a thick wire with a cross-sectional area of about 10 mm and a ferrite coil 8 with an air gap 10 to prevent magnetic saturation. Since core 9 is used, the dimensions are large, and making it a variable inductor is difficult due to shape 9.
This is difficult due to the price. Therefore, high impedance Z1
In the elements, due to variations in the inductance of the blockage ring L1 and variations in the capacitance of the capacitor C1, the parallel resonant circuit causes variations in the attenuation peak of the block filter (2) at the carrier signal frequency f. It is impossible to match. For this reason, not only is it not possible to fully utilize the characteristics of a band-elimination filter that uses resonance and has a sharp peak as shown in Figure 4, but it is also difficult to ensure that the characteristic decrease D (z) due to the resonance point shift (Δf-fk-fo) is Therefore, in order to increase the inductance of the blocking wire L1, the number of turns of the coil must be increased by 80, and as the coil and core dimensions become larger, the size of the block filter becomes larger and the cost increases. there were.

(Object of the Invention) The present invention solves the above-mentioned conventional problems, and makes it possible to easily adjust the parallel and series resonance points of block filter components to match the carrier signal frequency of a power line carrier monitoring and control device. The small that is.

The purpose is to provide a lightweight, low-cost block filter.

(Structure of the Invention) To achieve this object, the present invention uses a block filter to superimpose a carrier signal on a single-phase three-wire power line [J, N, V
A blocking wire for a carrier signal is connected to each of the blocking wires, a capacitor is connected in parallel to each of the blocking wires, and a series circuit of a variable inductor and a capacitor is connected in parallel to each of the blocking wires. , a circuit that resonates in series with a carrier signal by a variable inductor and a capacitor is connected to each of the live line and the neutral wire U-N, V-N on the power supply side of the blocking coil, and the load of the blocking coil is connected. Between the side live wire and the neutral wire U-N,
It is characterized in that a series circuit consisting of a variable inductor and a capacitor is connected to each of V-N so that the variable inductors are transformer-coupled.

(Description of Examples) Examples of the present invention will be described below with reference to FIGS. 5 to 7. FIG. 5 shows a circuit diagram of a professional (5) filter according to an embodiment of the present invention. In this embodiment, the block filter 11 is connected to single-phase three-wire power lines U and N.

For each of ■, the blockage wire for the carrier signal current is ``+001L''.
1oN, L. v and connect this obstructing line L1oU.

"ION l" 10V capacitors c and c
.

10U 1ON C1ov are connected in parallel, and further occlusion rings L1oU, L,.

,.

"Series circuit with variable inductor and capacitor for each of 1 ov" 201J-C20U I L2ON '-C2O
N t "20V - C20V are connected in parallel,
``1 out '' 1 ON # ``30U'' 30U series resonant circuit with variable inductor and capacitor on live wire and neutral wire U-N, V-N on the 1OV power supply side, respectively
# "30V"" C30V (carrier signal frequency f.

), and connect Li0U # LlON
# ”, between the live line and neutral line on the load side of OV, U-N, V-N
A variable inductor with two windings in each ``401J #L4
0V'! : Series circuit with Co7 capacitor C40U IC40V "40u -040tr +"40V '-
It is configured by connecting C40V. Then, all 10 1N 1 except for the blockage rays L , L , and L
As shown in FIG. 6, the V element is mounted on a printed circuit board 12 and housed in the lower part of the blocking wire, realizing a concrete case structure. 13 is a component, 14
15 indicates a filter case, and 15 indicates a terminal fitting.

The circuits connected to the live line and the neutral line U-N and V-N have the same function as the conventional example, but the blockage line "10U"
'''Series circuit of variable inductor and capacitor connected in parallel to 1ON I LloV'-'200''-C20
U' L2ON -C2ON.

L2ov-C2ov governs the parallel resonance point in the parallel circuit with the obstruction wire. If the series resonance point of the L20'-C20 series circuit is set to a frequency higher than the carrier signal frequency, the carrier signal frequency f. In the above, the impedance of the L2o-C2o series circuit is capacitive, and if the impedance is ``C2'0'', a parallel resonance occurs between the combined capacitance of C1o + C2'o and the inductance ``-''10 of the blocking wire. At this time, the parallel resonance point can be adjusted by trimming the variable inductor L2o.

On the other hand, if the series resonance point of the I, 2o-C2o series circuit is set to a frequency lower than the carrier signal frequency, the carrier signal frequency f. In , the impedance of the series circuit is inductive, and if we toss the impedance with L2'o, then (L, .

Parallel resonance occurs between C1o and the composite inductance of 10L2'o)/L1o-L2'o. In this case as well, the parallel resonance point can be adjusted by trimming the variable inductance L2o. Further, the range of band elimination can be adjusted by the difference between the series resonance frequency of L2o-C2° and the carrier signal frequency. That is, this is because the attenuation level can be adjusted by creating impedance through series resonance. The characteristics of the above embodiment are shown in FIG. As above, L2
By changing the series resonance point of the o-C2o series circuit, the center frequency of the band emission can be arbitrarily varied, and the frequency can also be varied within the band.
ON 1”10V and 37 de7 C1ou # C1
By correcting variations in the value of oNe C1ov, it is possible to realize a filter with a sharp peak utilizing resonance as shown in FIG. As a result, unlike the conventional example, there is no need to compensate for the decrease in characteristics due to the resonance frequency deviation Δf, so the block filter can be made smaller, and the block filter can be made much smaller and lighter.

(Effects of the Invention) According to the present invention, the deviation of the parallel resonance point due to variations in the inductance of the blockage coil and the capacitance of the capacitor connected in parallel thereto can be corrected, and it is possible to have a sharp peak and to perform adjustment within the band. This makes it possible to realize a block filter that is compact, lightweight, and inexpensive with high performance.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram explaining a power line conveyance monitoring and control device, Fig. 2 is a circuit diagram showing a block filter according to a conventional example, Fig. 3 is an external view of a blocking wire according to a conventional example, and Fig. 4 is a conventional example. FIG. 5 is a block filter circuit diagram according to an embodiment of the present invention, FIG. 6 is a side cross-sectional view of a block filter according to an embodiment of the present invention, and FIG. 7 is a diagram showing a block filter according to an embodiment of the present invention. FIG. 3 is a characteristic diagram of a block filter according to an example; 11...Block filter, 12--
Printed circuit board, 13...Component parts, 14...
・Song・Filter case, 15...Terminal fittings. Figure 3 Figure 6

Claims (2)

[Claims] (1) A blocking wire ring for the carrier signal is connected to each of the single-phase three-wire power lines on which the carrier signal is superimposed, a capacitor is connected in parallel to each of the blocking wire rings, and a capacitor is connected in parallel to each of the blocking wire rings. A series circuit of a variable inductor and a capacitor is connected in parallel, and a circuit that resonates in series with a carrier signal formed by the variable inductor and capacitor is connected between a live wire and a neutral wire on the power supply side of the blocking wire, respectively; A block filter comprising a series circuit of a variable inductor and a capacitor between the live line and the neutral line on the load side of the blocking wire ring, and connected so that the variable inductors are transformer coupled. (2) The block filter according to claim (1), wherein a series resonance point of a series circuit of a variable inductor and a capacitor connected in parallel to each of the blocking wires is isolated from a carrier signal frequency.