JPS5846843B2 - Inductance element of power line carrier blocking filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inductance element for a power line carrier blocking filter in which a plurality of coils are wound around the same magnetic material. Moreover, it is an object of the present invention to provide an inductance element for a power line carrier blocking filter in which the winding of the coil can be easily performed without causing winding distortion.

In so-called power line carrier communication, in which communication is carried out by superimposing high-frequency signals on 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 Converts notifications into signals and transmits them through power lines.

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.

Generally, if the coils are arranged perpendicular to each other, the orthogonal coils will not interfere with each other.

By the way, it is not generally known that if coils are wound on the same magnetic material, for example, a ferrite core, and arranged so as to be orthogonal to each other, a large inductance can be obtained independently for each coil with a small number of turns.

The power line carrier rejection filter of the present invention utilizes the above-described winding arrangement to configure a low-pass filter and a band rejection filter circuit, and removes high-frequency signals concentrated in the commercial power frequency.

In Fig. 1, 1 is a magnetic material, and this magnetic material 1 is a rectangular parallelepiped part 1.
The concave protruding piece 1a is integrally provided on the upper and lower end surfaces of both sides of c, and a groove 1b is provided around the side periphery, and the coil 4 is wound in the groove 1b. The coil 2 is wound in the front-rear direction along the upper and lower end surfaces and the front and back surfaces of the rectangular parallelepiped part 1c so as to be perpendicular to the coil 4, and further protrude perpendicularly to the coils 2 and 4. The coil 3 is wound in the left-right direction along the concave plane of the piece 1a and both sides of the rectangular parallelepiped part 1c, and gaps are formed between the coils 2, 3 and 4 so that they do not come into contact with each other.

Terminals 5, 6, 7, 8 and 9, 10 of each coil 2, 3, 4
is the inductance output terminal of each coil 2, 3.4.

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 11, 12, 13, and 14 connected between the four terminals A to 4 are the inductance elements LX as shown in Figure 3a, and the inductance elements LX are as shown in Figure 3b.
The inductance element shown by K and the capacitance element C8
The impedance sides 15, 16 and 17 are constructed by a series circuit of a capacitance element C8 shown in FIG. 3cV or a series circuit of an inductance element C6 shown in FIG. 3D.

FIG. 4 shows a so-called band-elimination filter circuit using the L-type filter shown in FIG. Connect capacitors 18 and 19 between 6, 7, and 8, respectively.
It constitutes impedance side 11.12 in figure a.

i! Connect one end of the terminals 9 and 10 to the terminal 5 or 6,
The other end of the terminals 9 and 10 is connected to one end of the terminals 5 and 6 via a capacitor 20 to form an impedance side 15.

FIG. 5 shows another embodiment of the present invention, in which a capacitor 19 is connected between terminals 7 and 8 of coil 3, and a capacitor 18 is connected between terminals 5 and 6 of coil 2, as shown in the figure. Then, connect terminal 6 of coil 2 to terminal 9 of coil 4,
Further, the terminal 7 of the coil 3 is connected to the terminal 10 to constitute a band rejection type filter circuit as shown in FIG.

Now, in the circuit of FIG. 4, generally the resonant frequencies of the series and parallel resonant circuits are f=□, aVLC.

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 of the housing 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 C terminal increases.

Therefore, now B. If a high-frequency signal (resonant frequency) superimposed on the commercial power frequency is applied between terminals D, the high-frequency signal will be attenuated between terminals A and C 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, inductance can be independently taken out by winding a plurality of coils on the same magnetic material so as to be orthogonal to each other, so a large inductance can be taken out independently with a small number of turns.

This has the advantage that it is smaller and lighter than a filter using separately wound inductances, and requires fewer parts.

In particular, three coils can be wound in orthogonal directions and overlapped, and there are grooves between the three coils.
The concave surfaces of the protruding pieces create a gap between the protruding pieces so that they do not come into direct contact with each other, making it easy to take measures against the withstand voltage between the layers, and making the overall structure compact and miniaturized.

In the old days, the grooves on the side circumference of the rectangular parallelepiped part prevented the first coil from being pulled out and unwinding, and the protruding pieces on both sides of the casing prevented the second coil from pulling out and unwinding. In addition, the protruding parts on both sides of the concave surface of the protruding piece can prevent the third coil from coming out and the first winding from breaking, resulting in a beautiful winding finish and easy winding work. This has the effect that there is less risk of winding defects and the yield is good.

[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. lJ fee, 2
, 3.4 is a coil.

Claims (1)

[Claims] 1. Made of a magnetic material formed in the shape of a rectangular parallelepiped, with concave projecting pieces integrally protruding from both upper and lower end surfaces of the rectangular parallelepiped, and a groove formed around the side periphery, and wound within the groove. A second coil is wound along the upper and lower end surfaces of the rectangular parallelepiped part of the magnetic material and along the front and back directions so as to be orthogonal to the first coil, and the second coil is wound around the concave surface of each protruding piece and both sides of the rectangular parallelepiped part. An inductance element for a power line carrier blocking filter, comprising a third coil wound in a direction orthogonal to the first and second coils.