JPH02207508A - Unbalance-balance converter - Google Patents

Abstract

PURPOSE:To make the positive phase/reverse phase level of balanced output and the phase relation accurate so as to reduce variations in mass production by providing the grooves for fixing the positions of windings in a ferrite using a ferrite core and paired cables, or fixing them with materials such as polyimide film. CONSTITUTION:Grooves 11 are provided at the corner parts of a ferrite core 10 so as to fix the positions of pair cables, or grooves 12 are provided at the winding positions of the pair cables so as to fix them. Accordingly, it turns out that if once wound, the paired cables hardly move from the positions, and even if similar balance are manufactured in large quantities, the property dispersion becomes small. Or, by passing paired cables 14 through the holes 131 and 132 which are provided in a polyamide film 13 and have diameters of such degree that required pair cables pass, the windings are prevented from coming loose by external force. Furthermore, if electrodes 15 by conductors are provided on the ferrite cores 10, and when terminal 31 and 32 are formed making use of those electrodes, the same effect can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an unbalanced and balanced converter (hereinafter referred to as a paran) used in CATV, television, radio equipment, communication equipment, etc.

Conventional technology PARAN is used for CATV/TV receivers, radio equipment, etc.
It is essential for communication equipment, and conventionally Paran, which is a pair of wires wrapped around ferrite, has been widely used. Recently, with the development of information networks, there has been a strong demand for smaller and lighter devices, as well as wider bands and higher frequencies due to the use of multiple frequencies.

Hereinafter, the configuration of a conventional paran will be described with reference to the drawings.

Figure 4 is a circuit diagram of a conventional transmission line type paran.
0 is a ferrite core, 1 and 2 are unbalanced terminals, 3. The blank terminal is a balanced terminal for normal phase and negative phase, and 5 is an intermediate terminal thereof. Moreover, FIG. 5 is a sketch when the paran of FIG. 4 is constructed using a ferrite core and a pair of wires. There are various ways to use such a paran, but when trying to convert a certain signal into unbalanced and balanced, ground terminal 2.5 in Figure 5, input the unbalanced signal from terminal 1, and connect it to terminal 2.5. 3,4
It is common to obtain a balanced output signal from Terminal 3 at this time. The zero signal relationship requires that the output levels be equal and the phases be inverted.

Problems to be Solved by the Invention However, during the manufacturing stage of the balun, the pair wires 16 may become separated as shown in FIG. occurs,
As it becomes more difficult to meet the above requirements,
The characteristics of each balun will also be different. Furthermore, similar results often occur when the balun is attached to a printed circuit board or due to external force when adjusting the balun.

This problem becomes more serious as the frequency at which unbalanced/balanced conversion is attempted increases, especially as the number of turns decreases above 1 () Hz. Even meeting the demands was difficult and posed a challenge.

The present invention solves the above-mentioned problems of the conventional technology, and maintains the positive and negative phase levels and phase relationships of the balanced output of an unbalanced balanced converter (balun) as designed, and eliminates variations during mass production. The purpose is to improve.

Means for Solving the Problems The present invention uses a ferrite core and a pair of wires, and provides a groove for fixing the winding position in the ferrite, or fixes it with a material such as a polyimide film. This aims to achieve the above objectives.

Effects The present invention reduces characteristic deviations related to manufacturing, installation, adjustment, etc. of a ferrite core type unbalanced converter (balun) with the above configuration, and reduces variations in the level and phase relationship between positive and negative phases. It was made so that it would become so.

EXAMPLE A first example of the present invention will be described below with reference to the drawings.

FIG. 1 is a sketch of a ferrite core which is a main part of a balun in a first embodiment of the present invention. Grooves 11 are provided in the corners of the ferrite core 10 in Figure (a) to fix the position of the pair wires, and in Figure (b), the winding of the pair wires is fixed by providing grooves 12 at the positions. . Therefore, once it is wound, its position is difficult to move, and even if similar baluns are manufactured in large quantities, there will be less variation in their characteristics.

FIG. 2 is a sketch of the balun in the second embodiment of the present invention, and the pair wires are coated with polyimide film 13 before terminal treatment.
through. Holes 131 and 132 are provided in the polyimide film with a diameter large enough for the required pair of wires to pass through.
Passing through these holes 131 and 132 prevents the winding from unraveling due to external force. , Figure 3 is...
In the third embodiment of the present invention, an electrobalance 15 made of a conductor is provided on the ferrite core lO as shown in FIG. A similar effect is achieved by forming .32.

Incidentally, although each of the above embodiments has been described individually, there is no harm in combining these.

Effects of the Invention As described above, the present invention eliminates variations in balun manufacturing, installation, adjustment, etc. by using grooves provided on the ferrite core, the use of polyimide films, or the use of electrodes on the ferrite core. It can be reduced and the effect is great.

[Brief explanation of the drawing]

Figure 1 (a), (b), Figure 2 and Figure 3 (a),
(b) is a sketch of the unbalanced and balanced converters in the first to third embodiments of the present invention, FIG. 4 is a circuit diagram of the unbalanced and balanced converters, and FIGS. 5 and 6 are conventional unbalanced and balanced converters. It is a sketch of a converter. 10... Ferrite core, 11.12... Groove, 13
...Polyimide film, 14...Pair wire, 15...
electrode. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (3)

[Claims] (1) An unbalanced converter characterized in that a ferrite core and a pair of wires are used, and a groove is provided for fixing the pair of wires wound around the ferrite. (2) The unbalanced and balanced converter according to claim 1, wherein the pair of wires is fixed with a polyimide material instead of the groove. (3) The unbalanced converter according to claim 1, wherein instead of the groove, an electrode made of a conductive material is provided on the ferrite core to perform terminal processing.