JP2545985B2 - Arrester circuit mounting structure - Google Patents

Description

The present invention relates to a mounting structure of an arrester circuit, and more particularly to a mounting structure of an arrester circuit used in a circuit of a wireless communication device.

[Prior Art] Conventionally, in a wireless communication device, an arrester circuit is used to prevent an abnormal voltage induced in a signal line due to a lightning strike or the like.

The mounting structure of this type of arrester circuit is shown in FIG. 6, and the arrester element 5 is formed by two conductor plates (not shown).
It is configured to be inserted between terminals 1 and 2 by being sandwiched between them, and some of them are included in a predetermined module.

[Problems to be Solved] In the above-described conventional arrester circuit mounting structure, the mounting location is limited due to the above structure, and it is particularly difficult to mount it on a printed wiring board (PWB) or the like. In addition, in addition to alternating current (AC) and direct current (DC) power input, if a high frequency signal is also supplied by a single coaxial cable, there is a problem that the conventional arrester circuit mounting structure cannot perform impedance matching to high frequency. there were.

The present invention has been made in view of the above problems, and an object thereof is to provide a mounting structure of an arrester circuit that can be easily mounted on a printed wiring board or the like and that has good impedance matching for high frequencies.

[Means for Solving the Problem] In order to achieve the above object, the mounting structure of an arrester circuit according to the present invention is a mounting structure of an arrester circuit in which an arrester element is connected in parallel between two terminals. A conductor wire connected to realize high impedance between terminals, the arrester element placed with one end in contact with an intermediate portion of the conductor wire, and the presser foot that contacts the other end of the arrester element via a retainer plate. And a conductor cover that shields the entire circuit formed by the conductor and the arrester element.

[Operation] According to the above configuration, the conductor is equivalent to the high frequency in the inductance L and the arrester element constitutes the capacitance C, and the arrester circuit is an LCL low pass filter (LPF). Therefore, impedance matching with respect to a high frequency can be achieved.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a cross-sectional view and an exploded cross-sectional view showing the configuration of the mounting structure of the arrester circuit according to the first embodiment, in which the tip end of the strip line formed on the wiring board 3 is connected to terminals 1, 2 The mounting structure of the arrester circuit is formed between the terminals 1 and 2.

First, a conductor 4 with high impedance between terminals 1 and 2.
This is done by inserting the bent ends of the conductor wire 4 into the small holes formed in the terminals 1 and 2. Further, the arrester element 5 is placed on the intermediate portion of the conductor wire 4 so that one end thereof is connected to the arrangement state shown in FIG.

After that, the conductor cover 7 is covered, and the holding portion 7a is brought into contact with the other end of the arrester element 5 via the holding plate 6. Further, the peripheral end of the conductor cover 7 is connected to the wiring board (ground portion) 3 as shown in FIG. 1 (a), and the conductor 4 and the arrester element 5 are connected as shown in FIG. 1 (b). To conductor cover 7
It is fixed by and the whole circuit is shielded.

FIG. 3 shows an equivalent circuit of an arrester circuit having a conventional mounting structure and an arrester circuit having a mounting structure of the present invention. In the case of the present invention, the equivalent circuit is shown in FIG. It becomes an L-C-L circuit.

That is, since the conducting wire 4 is of high impedance, the inductance L is formed on both sides from the connection point of the arrester element 5, and the arrester element 5 constitutes the capacitance C. Therefore, the conducting wire 4 and the arrester element 5 are formed. Thereby forming an L-C-L circuit which is a low pass filter (LPF). Therefore, impedance matching with respect to high frequencies can be achieved by this L-C-L circuit.

Further, in the present invention, since the conductor 4 is used as the high impedance signal line, the printed wiring board (PW
The pattern B) has the advantage of being able to withstand a large current that requires a wide wiring width and realizing a compact mounting structure.

Next, a second embodiment will be described with reference to FIGS. 4 and 5.

In the second embodiment, the mounting state of the arrester element can be confirmed after the mounting structure of the arrester circuit is assembled.

As shown in FIG. 4, the arrester element holding portion 7a of the conductor cover 7 is provided with a confirmation hole 8 having a diameter smaller than that of the arrester element 5. Therefore, as seen from the upper side, it becomes as shown in FIG. 5, and it is understood that the presence or absence of the arrester element 5 can be confirmed from the confirmation hole 8.

According to this second embodiment, after being assembled as a product,
There is an advantage that the mounting state of the arrester element in the module can be confirmed, and the erroneous insertion of the arrester element 5 can be prevented without removing the conductor cover 7 or inspecting the electrical characteristics.

[Effects of the Invention] As described above, according to the present invention, the arrester element is placed on the intermediate portion of the high-impedance conducting wire and fixed by the conductor cover, so that it can be easily attached to a printed wiring board or the like. You can Further, since the conductor wire has a small width, a compact structure can be achieved without using a wide printed wiring for a large current.

Further, according to the mounting structure of the arrester circuit of the present invention, L
Since the -CL circuit is configured, there is an effect that it is possible to configure a low pass filter (LPF) that is impedance-matched to high frequencies even when connected by a coaxial cable.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a mounting structure of an arrester circuit according to a first embodiment of the present invention. FIG. 1A is a side sectional view of a main part, and FIG. Figure, second
The figure is a top view when the conductor cover is removed, FIG. 3 is an equivalent circuit diagram, FIG. 3A is an equivalent circuit of a general arrester circuit, and FIG. 3B is an arrester circuit having a mounting structure of the present invention. FIG. 4 is a diagram showing the configuration of the second embodiment, FIG. 4 (a) is a side sectional view, FIG. 4 (b) is a front sectional view and an exploded sectional view, and FIG. And FIG. 6 is a diagram showing a conventional arrester circuit. 1,2: Terminal 3: Wiring board 4: Conductor 5: Arrestor element 6: Presser plate 7: Conductor cover 7a: Presser section 8: Confirmation hole

Claims (1)

(57) [Claims] 1. In a mounting structure of an arrester circuit in which arrester elements are connected in parallel between two terminals, a conductor wire connected to realize high impedance between predetermined two terminals on a printed wiring board, and an intermediate portion of the conductor wire. The arrester element, which is placed with one end in contact with the portion, and the holding portion which comes into contact with the other end of the arrester element via a holding plate are formed, and the entire circuit constituted by the conductor wire and the arrester element is shielded. An arrester circuit mounting structure comprising: a conductor cover.