JPS5824929B2 - Inductance element of power line carrier blocking filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a plurality of sets of coils 2, 3, 4, 5, 6, and 7 are wound perpendicularly to each other on the same magnetic material 1.゜It pertains to the inductance element of a filter for power line carrier wave blocking, which is characterized by connecting 5.6 and 7 in series and extracting the composite inductance, and its purpose is to reduce the power line carrier wave which can be made compact and lightweight. The present invention provides an inductance element for a blocking filter.

In so-called power line carrier communication, in which communication is carried out by adding high-frequency signals to the normal commercial power frequency, the path necessary for signal transmission is prepared in advance as a power line between the transmitter and receiver, and the transmission path, which is the power Converts notifications into signals and transmits them through railroad tracks.

Therefore, it has the advantage that there is no need to newly install a dedicated transmission line for signal transmission.

However, if the power line is a return-to-ground type or if the outdoor signal leakage level exceeds a specified value, the related laws and regulations will be required, which has hindered the spread of power line carrier communications.

For this reason, attempts have been made to use line filters to solve the related legal and regulatory obstacles, but the coils used in conventional balanced line filters have separate windings to increase the inductance and reduce the size of the coil. It was wrapped in magnetic material.

Therefore, the shape and weight increase depending on the current capacity,
This has the disadvantage that the installation location of the device is difficult.

The present invention has been provided in view of the above-mentioned drawbacks, and will be described in detail below with reference to Examples.

Reference numeral 1 denotes a magnetic material such as a substantially rectangular ferrite core, and two sets of coils 2, 3.4, 5, 6. Turn each bifilar wound coil 2, 3.4
．． 5.6.7 pairs are arranged so that their magnetic flux directions are perpendicular to each other.

Terminals 8 to 19 of each coil 2, 3.4, 5.6, and 7 are used as inductance output terminals of each coil 2 to 7.

Figures 2a and 2b show the basic types of filter circuits, with Figure 2a having a so-called type and Figure 2 having a π type configuration.

In Figures 2a and 2b, the impedance sides 20, 21, 22° 23 connected between the four terminals A to 4 are inductance elements as shown in Figure 3a, or as shown in Figure 3. Inductance element and capacitance element C shown
The impedance sides 24, 25, and 26 are constructed by a series circuit of a capacitance element C8 shown in FIG. 3C or an inductance element shown in FIG. 3D and a capacitance element C6.

FIG. 4 shows a so-called band rejection filter circuit using the L-type filter shown in FIG. 4 are connected in series to form a composite inductance element L1, and a capacitance element C1 is connected in parallel to both ends of this composite inductance element L1 to constitute the impedance side 20 in FIG. 2a.

Further, in the same manner as described above, coils 3 and 5 are connected in series to form a composite inductance element L2, and a capacitance element C2 is connected in parallel to this composite inductance element L2 to constitute the impedance side 21 in FIG. 2a.

The inductance elements L1L2 are magnetically coupled by their mutual induction coefficient M.

The coil 6 or 7 constitutes the impedance side 24 of FIG. 2a by connecting the capacitance element C3 in series.

FIG. 5 shows another embodiment of the present invention, in which the magnetic material 1
The rectangular parallelepiped part 1c has concave projecting pieces 1a integrally protruding from both upper and lower end faces, and a groove 1b around the side periphery, and the coil 6 is wound in the groove 1b. At the same time, the coils 2 and 3 are wound with a bifilar in the front-rear direction so as to be perpendicular to the coil 6 and along the upper and lower end surfaces and the front and rear surfaces of the rectangular parallelepiped part 1c. Further, the coils 4 and 5 are wound in the left-right direction using a biairer so as to be perpendicular to the concave plane of the protruding piece 1a and both side surfaces of the rectangular parallelepiped part 1c. A gap is formed between the coils 2, 3, and 4.5 so that they do not come into contact with each other, and the coils 2, 3, and 4.5 are connected in the same manner as described above to form a composite inductance element L1. The capacitance element C1C2 is connected in parallel to L2 as each composite inductance element, and the capacitance element C3 is connected in series to the coil 6.

Therefore, the impedance side 20 configured by each
, 24 and 21 to form the band-elimination filter circuit shown in FIG.

Now, in general, if the electromagnetic coupling coefficient is R, the relationship between the self-inductance L and the mutual induction coefficient M is R2MO≦R≦1.

Therefore, in FIG. 4, the composite inductance element L1L2
uses bifilar-wound coils 2, 3, 4, and 5 whose windings are arranged orthogonal to each other, so R≦, and the combined inductance becomes large and the impedance of each impedance side 20.21 becomes large. .

Now, in the circuit shown in FIG. 4, the resonant frequency of the series and parallel resonant circuits is generally f=-1-1, which is 2aJ low.

Therefore, if the resonant frequencies for the high-frequency signals of each circuit are matched, the impedance between the A and B terminals and between the C2D terminal will exhibit a maximum value, and the impedance between the A and C terminals will exhibit a minimum value.

In addition, for commercial power frequency, between A and B terminals and between C and D
The impedance between the terminals is small and A.

The impedance of the B terminal increases.

Therefore, now B. If a commercial power supply frequency plus a high frequency signal (resonant frequency) is applied between the D terminals, the high frequency signal will be attenuated between the A and C terminals according to the ratio of the impedance of the parallel resonant circuit to the impedance of the series resonant circuit. Therefore, only commercial frequencies will pass through.

Note that if the circuit is constructed by slightly shifting the resonant frequencies of each impedance side in FIG. 4, it is possible to obtain a wider bandwidth than when the resonant frequencies are matched.

In the present invention, multiple sets of bifilar-wound coils are wound on the same magnetic material so as to be orthogonal to each other, and each coil is connected in series alternately to extract a composite inductance. Therefore, a large inductance can be independently extracted with a small number of turns. This has the advantage that it is smaller and lighter than a filter using a separately wound inductance, and requires fewer parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2a is a perspective view of an embodiment of the present invention. b is a block diagram of the filter circuit; FIGS. 3a, b, and c. d is an element configuration diagram on the impedance side of the filter circuit, FIG. 4 is a circuit diagram using one embodiment of the present invention, and FIG. 5 is a perspective view of another embodiment of the present invention. 2,3
, 4, 5, 6, and 7 are coils.

Claims (1)

[Claims] 1. An inductance element for a power line carrier blocking filter, characterized in that a plurality of sets of bifilar-wound coils are wound on the same magnetic material so as to be orthogonal to each other, and each coil is alternately connected in series to extract a composite inductance. .