JPS61101109A - Balancing-unbalancing converter - Google Patents

Abstract

PURPOSE:To attain mechanization of production, mass-productivity attended with improvement of working efficiency and miniaturization by inserting a wire through a ferrite having the 1st and 2nd holes so as to attain balancing with excellent characteristic in a transceiver for a television set or a communication equipment. CONSTITUTION:A metallic wire 17a is connected to an output terminal from an input terminal 12 via a hole 11a of a ferrite 11, a metallic wire 17b is connected to an output terminal 15 from the input terminal 12 via a hole 11b of the ferrite 11, a metallic wire 18a is connected to the output terminal 15 from an input terminal 13 through a hole 11a of the ferrite 11 from the input terminal 13 and a metallic wire 18b is connected to an output terminal 16 from the input terminal 13 via the hole 11b of the ferrite 11. The metallic wire is not wound to the ferrite 11 but the metallic wired 17a, 17b, 18a, 18b have only to be inserted to the holes 11a, 11b of the ferrite 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to balanced/unbalanced converters (hereinafter referred to as baluns) used in mixer circuits of transmitter/receivers in televisions and communication devices, and phase inverters of GSS pull-unders. ).

Conventional configuration and its problems When high frequency power is transmitted from an unbalanced circuit to a balanced circuit, an unbalanced current is generated at the connection point, causing losses such as unnecessary radiation and mismatch. A balun is used to remove this. A typical balun has a structure in which a coil is spirally wound several times around a magnetic core with high magnetic permeability.

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

FIG. 1 is a perspective view of a conventional balun.

In FIG. 1, 1 is a ferrite having through holes 1a and 1b, 2 and 3 are input terminals on the unbalanced side, and 4, 5, and 6 are output terminals on the balanced side (however, 6 is a ground terminal). 7a
, 7b are metal wires connected to the input terminal 2, and the respective holes 1a of the ferrite 1.

After being wound around the ferrite 1 several times via 1b, it is connected to input terminals 4 and 5. 8a and 8b are input terminals 3
each hole 1 of ferrite 1 with a metal wire connected to
After being wound around the ferrite 1 several times via a and 1b,
It is connected to input terminals 5 and 6.

In the above configuration, the metal wires 7a, 7b.

By wiring wires 8a and 8b across the ferrite 1 and winding them around the ferrite 1 several times, the degree of mutual coupling is increased and losses caused by unnecessary radiation and mismatch are minimized.

However, with the above configuration, the work of winding the metal wires 7a, 7b, 8a, and 8b around the ferrite 1 is extremely complicated, which poses a major obstacle in terms of mechanization, miniaturization, and mass production. It had become.

OBJECTS OF THE INVENTION In view of the above drawbacks, the present invention provides a balun that has a simplified structure and is suitable for mechanization, miniaturization, and mass production.

Structure of the Invention The present invention comprises a ferrite having first and second holes provided substantially parallel to each other; a second unbalanced terminal and a first unbalanced terminal; Second
．． a third balanced terminal, a first wire routed between the first unbalanced terminal and the first balanced terminal through the first hole of the ferrite, and a second wire of the ferrite; A second wire is wired between the first unbalanced terminal and the second balanced terminal through the first hole of the ferrite, and a second wire is wired between the second unbalanced terminal and the second a third wire wired between the balanced terminal and the fourth wire passed through the second hole of the ferrite and wired between the second unbalanced terminal and the third balanced terminal; By providing this, the above objective is achieved.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a perspective view of a balanced/unbalanced converter according to an embodiment of the present invention.

In FIG. 2, reference numeral 11 indicates two through holes 11a.

11b, each with a total length of 1
4M1 outer diameter 3×1.51yL1 hole diameter 0.8M, and magnetic permeability μ=40. 12.13 is an input terminal on the unbalanced side, and 14, 15.16 is an output terminal on the balanced side (however, 15 is a ground terminal). 17a.

1γb, 18a, and 18b are metal wires each having a wire diameter of 0.25 M, the metal wire 17a is connected from the input terminal 12 to the output terminal 14 through the hole 11a of the ferrite 11, and the metal wire 17b is connected from the input terminal 12 to the hole 11a of the ferrite 11. A metal wire 18a is connected to the output terminal 15 via 11b.

is connected from the input terminal 13 to the output terminal 15 through the hole 11a of the ferrite 11, and the metal wire 18b is connected from the input terminal 13 to the output terminal 16 through the hole 11b of the ferrite 110. Note that the metal wire 17a.

1, terminals 18a and 18b are connected to respective terminals 12-16 by solder.

According to the balun having the above configuration, instead of winding the metal wires a, 7b, sa, and sb around the ferrite 1 as in the conventional case, the metal wires a, 7b, sa, and sb are wound in the holes 11a of the ferrite 11, respectively.

It is only necessary to pass the metal wires 17a, 117b, 118a and 18b through 11b, which improves production efficiency and is highly mechanized and mass-producible. Furthermore, even if the ferrite is small, it is sufficient to simply pass the metal wire through the holes 11a and 11b of the ferrite 11, so that the ferrite, and therefore the balun, can be made smaller. Furthermore, as shown in FIG. 3, its characteristics far exceed those of the conventional configuration in specific bands.

As described above, according to this embodiment, the holes 11a, 1 of the ferrite 11
Metal wires 17a, 17b, 18a are attached to 1b.

A balun with good characteristics can be obtained simply by passing it through 18b, allowing for mechanization, miniaturization, and mass production.

Note that in this embodiment, the holes 11a of the ferrite 11.

The metal wires 17a and 18a1 and 17b and 18b passing through the ferrite 11 are not twisted, but by twisting the metal wires under the same conditions in the holes 11a+11b of the ferrite 11, better characteristics can be obtained as shown in FIG. You can get balan.

In addition, in the case of ferrite 11, if it is not possible to obtain a cylindrical ferrite as shown in Fig. 2, it is better to connect ferrites in the shape shown in Fig. 1 in series, but it is not necessarily necessary to have a cylindrical shape. , may be a rectangular parallelepiped.

Furthermore, metal wires 17a, 17b, 18a, 1
Although sb is connected to each of the terminals 12 to 16 by solder, it may be fixed by adhesive or the like. Further, although the ferrite 11 is substantially fixed between each terminal by this soldering, the ferrite 11 may be fixed using a separate fixing member.

Effects of the Invention The present invention has the following advantages. A balun with good characteristics can be obtained simply by passing a wire through the ferrite having the second hole, and it is possible to achieve mass production and miniaturization due to improved mechanization and work efficiency in manufacturing. There is something called value.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional balanced/unbalanced converter, Figure 2 is a perspective view of a balanced/unbalanced converter according to an embodiment of the present invention, and Figures 3 and 4 are the same balanced/unbalanced converter. It is a characteristic diagram of a converter. 11... Ferrite, 11a, 11b...
... Hole, 12.13 ... Input terminal, 14, 16.
16...output terminal, 17a, 1-rb,
18a, 1sb,,,-. metal wire. Name of agent: Patent attorney Toshio Nakao and one other name
37 Tutong Tzu (/4HK+ Figure 4 River embankment 1g, (sHz)

Claims (2)

[Claims] (1) A ferrite having first and second holes passing through it;
between the first and second unbalanced terminals and the first, second and third balanced terminals and the first unbalanced terminal and the first balanced terminal through the first hole of the ferrite; a first wire wired, a second wire wired through a second hole of the ferrite between the first unbalanced terminal and the second balanced terminal, and a second wire wired between the first unbalanced terminal and the second balanced terminal; A third wire is wired between the second unbalanced terminal and the second balanced terminal through a hole in the ferrite, and a third wire is wired between the second unbalanced terminal and the second balanced terminal through a second hole in the ferrite. and a fourth wire wired between the third balanced terminal and the fourth wire. (2) The first wire and the third wire, and the second wire and the fourth wire are each twisted in the hole of the ferrite. Balanced/unbalanced converter as described in .