JPH09284079A - Terminal noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the configuration with excellent productivity, economy and high density mount with respect to the terminal noise filter to prevent an EMC failure due to a terminal noise. SOLUTION: In the terminal noise filter of this invention, a fuse whose receptible terminal is press-fitted to lead wires 19a, 19b and soldered to the terminal of the fuse 4 is connected to a tab terminal 24 mounted on a printed circuit board 15. Thus, the configuration is simplified, heat generation by a contact resistance at a connection part is less and a terminal temperature of the fuse is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal noise filter for removing terminal noise leaking from electric equipment.

[0002]

2. Description of the Related Art FIG. 5 is a circuit diagram of a terminal noise filter. In general, the terminal noise types are classified into common mode and normal mode, and the former uses a line-to-line across-the-line capacitor, and the latter uses a common-mode filter coil or line bypass capacitor. Is common. In addition, it is advantageous to arrange the terminal noise filter near the power supply intake section from the viewpoint of improving its performance, and on the other hand, the fuse of the equipment has the same layout as the terminal noise filter because of its circuit arrangement. There is an advantage.

Therefore, as is the case with the prior art, with respect to the terminal noise filter, it is very common that the terminal noise filter substrate is provided with a fuse body. By doing so, it is obvious that the wiring and circuit configuration can be simplified. FIG. 7 is an external view of the board mounting surface.

Here, since the fuse 4 is generally configured to be fitted into the clip 14 so that it can be easily attached and detached at the time of service, the terminal portion of the fuse 4 depends on the contact resistance between the clip 14 and the fuse terminal portion. However, even in the Electrical Appliance and Material Control Law, the upper limit of temperature is set and regulated to ensure the reliability of the fuse.

As a countermeasure against this, the heat capacity is set so that the pattern land of the clip 14 of the fuse 4 inserted into the printed circuit board 15 is soldered or heat is conducted to suppress the temperature rise of the fuse terminal portion. A large jumper wire 16 having a relatively large wire diameter is arranged near the clip 14.

In addition, in order to obtain the same effect, there has been proposed a structure in which the tab terminal is arranged in the vicinity of the clip and the tab terminal has a function like a heat sink to suppress the temperature rise of the fuse terminal portion. .

[0007]

Therefore, in the conventional terminal noise filter, in order to lower the temperature of the fuse 4, additional work such as soldering the pattern land of the clip 14 and still satisfying the required performance. If not, the jumper wire 16 or a tab terminal functionally similar to the jumper wire 16 is used, which is not only a cost obstacle but also a major problem in terms of productivity deterioration.

As a means for avoiding this, as shown in FIG. 8, there is a method in which the lead wire 17 is soldered to the terminal portion of the fuse 4 with the high temperature solder 18, and is inserted into the printed board 15 and soldered. . In this case, since there is no heat generation due to the contact resistance of the connection portion which occurs in the clip 14, the above-mentioned problem of the temperature of the fuse terminal portion does not occur at all.

However, when a component fails in the market and the fuse is blown, the service worker melts the solder of the printed circuit board 15, removes the lead wire 17, and replaces the fuse. Such as soldering defects (tunnel, bridge solder, etc.), or lead wire 17 terminal processing defects (insulation distance shortage due to bending, etc.), etc.
Secondary product defects due to various service failures are expected. Therefore, the adoption of the fuse with a lead wire has an extremely serious adverse effect due to the problem of the fuse replacement service.

[0010]

According to the present invention, in order to solve the above-mentioned problems, a fuse with a resettable terminal in which a lead wire having a resettable terminal is connected to a terminal portion by soldering is arranged on a printed circuit board. A fuse is mounted by connecting to a tab terminal.

According to the above invention, since the resector pull terminal and the tab terminal make surface contact with each other and little heat is generated by the contact resistance, the temperature rise of the fuse terminal portion can be suppressed to a low level and the reliability is improved. Further, it becomes possible to simplify or abolish the heat dissipation means, which is extremely effective in reducing the number of parts of the terminal noise filter, eventually reducing the cost, and realizing high-density mounting.

Further, by inserting / removing the resector pull terminal and the tab terminal, the fuse can be easily replaced and surely connected, and the quickness and reliability of service are remarkably improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A fuse having a lead wire connected to a terminal by soldering, a resector pull terminal crimp-connected to the lead wire of the fuse, and a tab terminal arranged on a printed circuit board are provided. The fuse circuit is configured by connecting the terminals.

Then, since there is only a relatively small contact resistance between the tab terminal and the restorable terminal, it is detachable and excellent in serviceability, and the heat generation at the contact portion is small so that the temperature of the fuse terminal portion can be kept low and the reliability is high. improves.

Further, the fuse circuit is provided with a resectorable terminal, a fuse, and a tab terminal arranged on the printed board, and the resectorable terminal soldered to the fuse is connected to the tab terminal to form a fuse circuit.

This eliminates the need for crimping and connecting the reusable terminal to the lead wire, so that it is possible to realize a compact fuse with a resectorable terminal which has high productivity and is low in height when mounted.

Further, in addition to the above-described embodiment, a U-shaped metal wire which is covered or exposed is soldered to a printed circuit board so as to straddle the fuse.

Then, the movable range due to the collapse of the fuse can be limited, and a compact insulating structure design with a reduced clearance with the surrounding metal portion can be realized.

A terminal noise filter according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a circuit diagram showing a general circuit configuration used in the terminal noise filter of the present invention.

Input tab terminals 10 and 11 for AC1 and AC2
Commercial power is input from. The fuse 4 is arranged in the immediate vicinity of the input, and when a circuit such as the next stage or later has an abnormality such as a load short circuit and an excessive current flows, the fuse 4 is blown to open the circuit. The across-the-line capacitor 2 and the across-the-line capacitor 3 are capacitors for regenerating noise superimposed on the lines, that is, normal mode noise.

In the common mode filter coil 1, the magnetic fluxes induced by the paired coils do not cancel each other with respect to the load current and do not affect as a reactance load, but line-ground (body chassis).
It acts as an inductive reactance for the common mode noise that occurs between them, and prevents the noise from leaking to the outside.

Like the common mode filter coil 1, the line bypass capacitors 5 and 6 are also effective for common mode noise, and bypass and regenerate the noise superimposed between the line and ground to prevent the noise from leaking to the outside.

As other components, the surge absorber 7 absorbs a surge overvoltage between lines generated by an induced lightning or the like and protects the circuit. The surge absorbers 8 and 9 absorb the surge overvoltage generated between the similar line and ground. Here, the surge absorber is used in the series because even if one element is short-circuited,
This is to prevent the worst situation of electric shock by short-circuiting the chassis and the line by providing the element of.

Output tab terminals 1 of AC3 and AC4
The commercial power supply that has passed through the terminal noise filter is supplied from 2 and 13 to the load. FIG. 1 is an external view of a component surface when a terminal noise filter circuit according to an embodiment of the present invention is mounted on a printed board.

The restable terminal 20 is connected to the terminal lead wire 19
The fuse with resector pull terminal attached to the terminal portion of the fuse 4 by crimping connection to a and 19b is inserted and connected to the tab terminal mounted on the substrate.

In this way, the contact resistance between the restable terminal 20 and the tab 24 can be reduced, and the heat generation at the connecting portion can be suppressed low, so that the temperature of the terminal portion of the fuse 4 can also be lowered. Further, it is obvious that the heat generated in the connecting portion is conducted to the outside by being conducted through the tab 24, which contributes to the temperature reduction of the terminal portion of the fuse 4.

FIG. 2 is an external view from the side showing the connection state of the fuse with resector pull terminal. The fuse with resector pull terminal attached to the terminal portion of the fuse 4 is inserted and connected to the tab terminal mounted on the substrate.

Here, the restable terminal 20 is crimp-connected to the terminal lead wires 19a and 19b. On the other hand, the other ends of the terminal lead wires 19a and 19b are soldered to the terminal portion of the fuse 4 by the high temperature solder 18. This high-temperature solder 18 has a melting point higher than that of the solder for dipping a general printed circuit board, and care should be taken to prevent the lead wires 19a and 19b from melting and coming off from the terminal portion of the fuse 4 when dipping the solder. ing.

As can be seen from FIG. 2, the lead wire 19
Since the terminal portion of the fuse 4 and the resettable terminal 20 are connected via a and 19b, the size in the height direction of mounting on the printed circuit board 15 becomes large, and a metal portion or the like which may be touched by a person in the vicinity is provided. Insulation distance structure design with clearance to avoid contact is required. Also, fuse 4
It is necessary to take into consideration the clearance when external stress is applied to the body, which may impede the requirement for compact design.

Next, the mechanism of connection between the restable terminal and the tab terminal will be described with reference to FIGS. 3 (a) and 3 (b).
As shown in (a) of FIG.
A spring lever 21 having a locking projection 23 fitted into a lock hole 25 bored in the hole, and a roll spring 22 for guiding and pressurizing and fixing the tab 24 for sliding insertion.
It is composed of

As shown in (b), when the tab 24 is inserted into the resector pull-up terminal 20, the lock hole 25 of the tab 24 is fitted into the locking projection 23 of the tab 24 and the spring lever 21 is locked. Due to the elastic stress from above, the spring lever 21 and the tab 24 are pressed against each other and the surface contact state is maintained.

In FIG. 4, the fuse 4 is directly soldered to the terminal portion without the lead wires 19a and 19b. This eliminates the need for crimp connection to the lead wire to the resector pull terminal, and leads 19a, 19
Since there is no b, the size in the height direction can be reduced, and since there is no lead wire, the fuse 4 does not collapse due to external stress.
It is firmly fixed and held in the connected state. Therefore, the insulation distance structure design considering the clearance becomes easy.

Further, as shown in FIG. 6, by mounting the fuse 4 in the inverted U-shape with the fall prevention wire 25, the movable range of the fuse 4 is limited, the insulation distance structure design is facilitated, and it is compact. Design realization can be facilitated. If this fall prevention line 25 is a charging metal,
Covering facilitates the design of the insulation distance structure from the surroundings. Further, the charge metal of the fall prevention wire 25 is the fuse wire which is broken due to the explosion of the fuse and the fall prevention wire 2.
When the contact of No. 5 is assumed, it is more preferable from the viewpoint of safety that the potential of any one of the fuse terminals is set to the same, because a dangerous short circuit due to the above-mentioned contact is not formed.

[0035]

As described above, the terminal noise filter of the present invention has the following effects.

(1) A fuse circuit is constructed by connecting a fuse with a resectorable terminal in which a resectorable terminal crimp-connected to a lead wire is connected to a fuse terminal by soldering, and a tab terminal arranged on a printed board. Therefore, the tab terminal and the restorable terminal connection part have a more ideal surface contact structure and only a relatively small contact resistance exists, so it is detachable, excellent in serviceability, heat generation at the contact part is small, and the temperature of the fuse terminal part is low. Is kept low and reliability is improved.

(2) A fuse having a resectorable terminal directly soldered and connected to a terminal portion of a fuse is connected to a tab terminal arranged on a printed circuit board to mount the fuse. Can be realized. Therefore, while reducing the heat generation of the contact part,
Productivity can be improved by eliminating the process of crimping and connecting the re-sector terminal to the lead wire, and the insulation distance structure design can be facilitated and the compact design can be facilitated.

(3) By covering the fuse in a U-shaped manner or by soldering the exposed metal wire to the printed circuit board, the movable range due to the collapse of the fuse is set to the U-shaped metal. It is possible to limit by a wire, and it becomes possible to design a compact insulating structure with a small clearance with a surrounding metal part.

[Brief description of drawings]

FIG. 1 is an external view of a terminal noise filter according to an embodiment of the present invention.

FIG. 2 is a side view of an essential part showing the configuration of a fuse with a resetable terminal of the same terminal noise filter.

FIG. 3A is an external perspective view showing the configuration of a restable terminal and a tab terminal, and FIG. 3B is an explanatory view showing the principle of the connection between the restable terminal and the tab terminal.

FIG. 4 is a side view of the external appearance of the essential parts showing the configuration of a fuse with a resettable terminal of a terminal noise filter according to another embodiment of the present invention.

FIG. 5 is a circuit diagram showing an example of a general terminal noise filter.

FIG. 6 is an external view showing a fuse collapse prevention by a U-shaped metal wire.

FIG. 7 is an external view of a conventional terminal noise filter.

FIG. 8 is an external side view showing the configuration and mounting of a fuse with a lead wire.

[Explanation of symbols]

 4 Fuse 15 Printed circuit board 19a Terminal lead wire (lead wire) 19b Terminal lead wire (lead wire) 20 Resealable terminal 24 Tab terminal 26 Fall prevention wire (metal wire)

Continued Front Page (72) Inventor Yoshiro Ishio 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A fuse having a lead wire connected to a terminal by soldering, a recessable terminal crimp-connected to the lead wire of the fuse, and a tab terminal arranged on a printed circuit board. Terminal noise filter with fuse circuit configured by connecting the resetable terminal. 2. A terminal noise comprising a resettable terminal, a fuse, and a tab terminal arranged on a printed circuit board, wherein the resettable terminal soldered to the fuse is connected to the tab terminal to form a fuse circuit. filter. 3. The terminal noise filter according to claim 1, wherein a U-shaped coating is provided over the fuse or the exposed metal wire is soldered to the printed circuit board.