JP3159846U - Noise filter - Google Patents

Abstract

A noise filter having a high degree of freedom in the position of drawing out an earth wire is provided. An electronic component constituting a filter circuit is housed in a case formed by closing a lower end opening of a case with a conductive base portion, and a pair of side wall portions a facing the case. A long grounding terminal formed by disposing terminal portions 30a, 30b, 30c on the upper portion of the terminal block 26 formed on the base plate 20 and extending along the side wall portions 24a, 24b of the case 12 at both ends of the base portion 20. The portions 46 and 46 are formed, and three ground screw insertion holes 48 through which the ground screw 50 to which the ground wire is connected are provided at both end positions and the center position of the ground terminal portion 46. [Selection] Figure 1

Description

  The present invention relates to a noise filter, and in particular, an electronic component constituting a filter circuit is housed in a case, and a terminal block having a plurality of terminal portions connected to external terminals of an external circuit is provided on the side wall portion of the case. The present invention relates to a provided noise filter.

  The noise filter prevents the electronic device from malfunctioning due to various noises that enter the electronic device via an external line such as a power supply line or communication line, and also radiates the noise generated by the electronic device to the outside. It is used in order not to let it.

As an example of the noise filter, the electronic component constituting the filter circuit is housed in the case, and a terminal block having a plurality of terminal portions connected to the external terminals of the external circuit is provided on the side wall portion of the case. There is a utility model registration No. 3139956 proposed by humans.
As shown in FIGS. 19 to 23, this type of noise filter 60 includes a box-shaped case 62 having a substantially rectangular parallelepiped shape, and various electronic components (see FIG. (Not shown) is stored.
The case 62 includes a main body portion 63 having openings at the upper and lower ends, a lid portion 65 that closes the upper end opening of the main body portion 63, and a base portion 67 made of a conductive material that closes the lower end opening of the main body portion 63. Have.

  As illustrated in FIG. 24, the filter circuit 69 includes a common mode choke coil L formed by winding a conducting wire around a toroidal magnetic core to attenuate common mode noise flowing between the line and the ground, and a normal flowing between the lines. Connected between each line on the secondary side and ground to prevent electric shock even if X capacitors C1 and C2 connected between lines to attenuate mode noise and X capacitors C1 and C2 fail and short-circuit Y capacitors C3 and C4 and a resistor R for discharging the accumulated charge of the capacitor when the power is turned off.

In addition, terminal blocks 68a and 68b having two terminal portions 66a and 66b are provided on a pair of side wall portions 64a and 64b facing the case 62, respectively.
The terminal portions 66a and 66b have a screw receiving piece 74 in which a terminal screw 70 and a screw hole 72 are formed. Between the terminal screw 70 and the screw receiving piece 74, an electronic component constituting an external circuit is provided. By sandwiching and connecting the external terminals, the external circuit and the filter circuit in the case 62 are electrically connected.
Each terminal portion 66a, 66b is disposed between a partition wall 76 and a partition wall 76 standing on both sides.

Further, the case 62 is provided with an openable / closable cover 78 that covers the upper portions of the terminal portions 66a and 66b of the terminal blocks 68a and 68b. In this cover 78, the base end portions 80 on both the left and right sides are rotatably attached to the left and right partition walls 76, 76, respectively.
Thus, as shown in FIG. 19 and the like, by closing the cover 78 and covering the upper portions of the terminal portions 66a and 66b, dust adheres to the terminal portions 66a and 66b, or a finger is mistakenly touched by the terminal portions 66a and 66b. It can be prevented from touching and is safe.
In addition, as shown in FIG. 20, when the cover 78 is opened, the upper portions of the terminal portions 66a and 66b are opened, so that the connection work with the external terminals derived from the electronic components constituting the external circuit can be easily performed. it can.

  Further, mounting holes 80 and 80 are formed in one diagonal corner of the base portion 67, respectively. Further, U-shaped ground terminal portions 84 and 84 each having a hole 82 through which a grounding screw (not shown) is inserted are formed at the other diagonal corner portion of the base portion 67, respectively.

As shown in FIG. 25, an external terminal 86 of an electronic component that constitutes an external circuit is sandwiched and connected between a terminal screw 70 and a screw receiving piece 74 that constitute the terminal portions 66a and 66b. The electrical connection between the circuit and the filter circuit in the case 62 is realized.
Utility model registration No. 3139956

  In the conventional noise filter 60, since the ground terminal portions 84 and 84 are formed at the diagonal corners of the base portion 67, the base portion 67 of the noise filter 60 is fixed to a mounting plate or the like inside the electronic device. The ground wire drawing position when connecting the ground wire to the ground terminal portions 84 and 84 is fixed to the diagonal corner of the base portion 67, and the degree of freedom of the ground wire drawing position is low.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a noise filter having a high degree of freedom in the drawing position of the ground wire.

In order to achieve the above object, a noise filter according to claim 1 of the present invention comprises:
An electronic component constituting the filter circuit is housed in a case formed by closing the lower end opening with a conductive base portion, and a terminal portion is disposed on the upper portion of the terminal block formed on a pair of opposite side walls of the case. A noise filter formed by forming a ground terminal portion on the base portion,
The ground terminal portion is formed long along the side wall portion of the case, and a plurality of ground wire connection portions are formed in the ground terminal portion.

The noise filter according to claim 2 of the present invention is the noise filter according to claim 1,
The ground wire connecting portion is a ground screw insertion hole through which a ground screw to which a ground wire is connected is inserted.

The noise filter according to claim 3 of the present invention is the noise filter according to claim 2,
Three ground screw insertion holes are formed at both end positions and the center position of the ground terminal portion.

  In the noise filter of the present invention, the ground terminal portion provided on the base portion is elongated along the side wall portion of the case, and a plurality of ground wire connection portions are formed on the ground terminal portion. By changing the ground wire connecting portion for connecting the ground wire, the lead position of the ground wire can be changed, and a noise filter having a high degree of freedom in the lead position of the ground wire can be realized.

Hereinafter, a noise filter according to the present invention will be described with reference to the accompanying drawings.
1 is a perspective view showing a state in which a cover of a noise filter 10 according to the present invention is closed, FIG. 2 is a front view, FIG. 3 is a rear view, FIG. 4 is a plan view, FIG. 5 is a bottom view, and FIG. 7 is a left side view, and FIG. 8 is a perspective view showing a state in which the cover is opened.

  The noise filter 10 of the present invention includes a box-shaped case 12 having a substantially rectangular parallelepiped shape, and a filter circuit 14 such as that shown in FIG. Has been.

The case 12 is made of an insulating material such as resin, and has a main body portion 16 having openings at the upper and lower ends, a lid portion 18 made of an insulating material such as resin that closes the upper end opening of the main body portion 16, and the main body portion. It has a thin plate-like base portion 20 made of a conductive material that closes the lower end opening of 16. Note that both ends of the base portion 20 protrude to the outside of the side wall portions 24a and 24b of the main body portion 16 by a predetermined length.
A large number of heat radiation holes 21 are formed in the lid portion 18 and the main body portion 16 of the case 12.

The filter circuit 14 shown in FIG. 9 is formed by winding a conducting wire around a toroidal magnetic core and attenuating the common mode choke coil L that attenuates the common mode noise flowing between the line and the ground, and the normal mode noise flowing between the lines. The X capacitor Cx connected between the primary side and secondary side lines, and the secondary side line and ground to prevent electric shock even when the X capacitor fails and short-circuits. A Y capacitor Cy and a resistor R for discharging the accumulated charge of the capacitor when the power is turned off are provided.
In FIG. 9, Sw is a switch that is interposed between the Y capacitor Cy and the ground and opens and closes between the Y capacitor Cy and the ground. The switch can be constituted by a known rocker switch, for example.

The Y capacitor Cy constituting the filter circuit 14 affects the leakage current that leaks current from the line to the ground. In Japan, the leakage current flows directly to the ground. This is a mechanism whereby the leakage current flows neutrally.
For this reason, in Europe, even if the capacity of the Y capacitor Cy is increased and the leakage current increases, the leakage breaker of the power supply line will not operate. In Japan, the leakage current flows to the ground and the leakage is interrupted. The instrument will be activated and the power circuit will be shut off. Therefore, when a noise filter 10 with a large Y capacitor Cy capacity is installed in a European machine, and the operation is confirmed in Japan, the leakage breaker is activated due to the large leakage current, and the operation is confirmed. It will not be possible.
Therefore, the above-described switch Sw that can freely open and close between the Y capacitor Cy and the ground is provided, and even the noise filter 10 having a specification in which the capacity of the Y capacitor Cy is large and the leakage current is large corresponds to this. When temporarily used in a power supply environment, the above switch disconnects the Y capacitor Cy and ground to eliminate the leakage current, preventing the leakage breaker from operating due to the leakage current. is there.
Note that the circuit configuration shown in FIG. 9 is merely an example, and the present invention is not limited to this.

A pair of recesses 22a and 22b are formed at the diagonal corners at the upper end of the body portion 16 constituting the case 12, and a switch operating portion 23 for operating the opening and closing of the switch Sw is formed in one recess 22a. Is stored.
Thus, as shown in FIGS. 10 and 11, the switch operation portion 23 is housed in a recess 22 a formed in the main body portion 16 of the case 12 so that the switch operation portion 23 does not protrude from the outer surface of the case 12. Therefore, erroneous operation of the switch operation unit 23 can be suppressed.

  The concave portion 22a for accommodating the switch operation portion 23 may be formed in the lid portion 18 of the case 12. In short, it is only necessary that a recess for accommodating the switch operation unit 23 is provided on the outer surface of the case 12 so that the switch operation unit 23 does not protrude from the outer surface of the case 12.

Terminal blocks 26 and 26 are respectively formed on a pair of opposite side walls 24a and 24b of the case main body 16, and the terminal block 26 has a plurality of partition walls 28a, 28b, 28c, and 28d are provided (FIG. 8), and terminal portions 30a, 30b, and 30c are provided between the partition wall 28a and the partition wall 28b, between the partition wall 28b and the partition wall 28c, and between the partition wall 28c and the partition wall 28d. Has been placed.
Although illustration is omitted, each of the terminal portions 30a, 30b, and 30c is electrically connected to the filter circuit 14.
Each terminal portion 30a, 30b, 30c has a terminal screw 32 and a screw receiving piece 34 formed with a hole (not shown) through which the terminal screw 32 is inserted (FIGS. 8 and 13).
Thus, the external circuit and the filter circuit 14 in the case 12 are connected by sandwiching and connecting the external terminals of other electronic components constituting the external circuit between the terminal screw 32 and the screw receiving piece 34. It is designed to be electrically connected.

Reference numeral 36 denotes a cover that covers the upper portions of the terminal portions 30a, 30b, and 30c. As shown in FIGS. 13 and 14, the cover 36 is formed of a rectangular flat plate having flexibility such as resin. In addition, pins 38 projecting outward are formed at both ends of the rear end 36a.
The pins 38 of the cover 36 are inserted into holes 40 formed in the partition walls 28a and 28d at both ends of the terminal block 26 of the case body 16, and the cover rear end 36a is rotated by rotating the pin 38. The cover 36 can be opened and closed by moving.

As shown in FIGS. 15 and 16, the partition walls 28 b and 28 c are formed with an engaging portion 42 that engages with the tip 36 b of the cover 36, and the engaging portion 42 extends from the upper end to the inside of the case 12. A first inclined surface 42a inclined downward, a vertical surface 42b extending vertically downward from the tip of the first inclined surface 42a, and inclined downward from the lower end of the vertical surface 42b toward the outside of the case 12. The projection includes a second inclined surface 42c and a horizontal surface 42d extending in the horizontal direction from the tip of the second inclined surface 42c.
Thus, when closing the cover 36, the cover 36 is bent using the flexibility, and the tip 36b of the cover 36 is connected to the first inclined surface 42a-vertical surface 42b-second of the engaging portion 42. If it slides to the inclined surface 42c of this and arrange | positions under the horizontal surface 42d, the front-end | tip 36b of the cover 36 and the engaging part 42 will engage (refer FIG. 17).
On the other hand, when opening the cover 36, the front end 36b of the cover 36 is bent while utilizing the flexibility, and the horizontal surface 42d of the engaging portion 42-the second inclined surface 42-the vertical surface 42b-the first. If the first inclined surface 42a is slid, the engagement between the front end 36b of the cover 36 and the engaging portion 42 is released.

In the noise filter 10 of the present invention, the cover 36 that covers the upper portions of the terminal portions 30a, 30b, and 30c is formed of a flexible flat plate, and the rear end 36a of the cover 36 is connected to the partition wall 28a of the terminal block 26. 28d, and the cover 36 is bent so that the engaging portion 42 that engages the tip 36b of the cover 36 is formed in the partition walls 28b and 28c of the terminal block 26.
Therefore, it is not necessary to provide the engagement means on the cover 36, and it is only necessary to form the engagement portion 42 only on the partition walls 28b, 28c of the terminal block 26. Therefore, the cover 36 is closed and the upper portions of the terminal portions 30a, 30b, 30c. When covering the cover, the cover 36 and the partition walls 28b and 28c can be engaged with each other with a simple structure.

  At the four corners of the base portion 20, mounting holes 44 for fixing the noise filter 10 of the present invention to a mounting plate or the like inside the electronic device are formed.

In addition, long ground terminal portions 46 and 46 extending along the side wall portions 24a and 24b of the case main body portion 16 are formed at both ends of the base portion 20, and the ground terminal portion 46 includes Three ground wire connection portions are formed.
The ground terminal portion 46 has a vertical plate 46 a standing from the end of the base portion 20 and a horizontal plate 46 b extending from the upper end of the vertical plate 46 a to the inside of the base portion 20. The horizontal plate 46b is formed with three ground screw insertion holes 48 as ground wire connecting portions and three ground wire lead-out holes 49 disposed in the vicinity of each ground screw insertion hole 48, and one ground screw. A ground screw 50 is inserted through the insertion hole 48.
The three ground screw insertion holes 48 and the ground wire lead-out hole 49 are formed at both end positions and the center position of the ground terminal portion 46.
A ground wire (not shown) is connected to the ground screw 50 inserted through the ground screw insertion hole 48, and the ground wire is drawn out from the ground wire lead hole 49.

Thus, in the noise filter 10 of the present invention, the ground terminal portions 46 provided at both ends of the base portion 20 are formed to be elongated along the side wall portions 24a and 24b of the case body portion 16, and the grounding portion 46 is grounded. Since the ground screw insertion hole 48 through which the ground screw 50 to which the wire is connected is inserted and the three ground wire extraction holes 49 through which the ground wire is drawn out are formed, the ground screw insertion hole 48 through which the ground screw 50 is inserted is changed. As a result, the lead position of the ground wire can be changed, and a noise filter having a high degree of freedom in the lead position of the ground wire can be realized.
Note that the number of the ground screw insertion holes 48 and the ground wire lead-out holes 49 formed in the ground terminal portion 46 is not limited to three, and a plurality of them may be formed.
Further, if the ground wire is connected and pulled out between the ground screw 50 inserted through the ground screw insertion hole 48 and the horizontal plate 46b, the ground wire lead hole 49 is not required, and therefore the ground wire lead-out is not necessary. The hole 49 is not necessarily essential.

  Further, in the noise filter 10 of the present invention, the outer end X of the terminal block 26 having the terminal portions 30a, 30b, 30c is located inward of the predetermined distance Z from the outer end Y of the base portion 20 (see FIG. 3 and FIG. 3). (See FIG. 18).

  As a result, as shown in FIG. 18, when connecting the external terminals 52 of other electronic components to the terminal portions 30 a, 30 b, 30 c of the terminal block 26, the outer end X of the terminal block 26 is connected to the outside of the base portion 20. Since a marginal space for wiring is created by the predetermined distance Z generated by being positioned inward from the end Y, a noise filter with a high degree of freedom in wiring can be realized.

  In the above description, the case where there are three terminal portions 30a, 30b, and 30c constituting the terminal block 26 has been described as an example, but the number of terminal portions is not limited to this.

It is a perspective view which shows the noise filter which concerns on this invention. It is a front view which shows the noise filter which concerns on this invention. It is a rear view which shows the noise filter which concerns on this invention. It is a top view which shows the noise filter which concerns on this invention. It is a bottom view which shows the noise filter which concerns on this invention. It is a right view which shows the noise filter which concerns on this invention. It is a left view which shows the noise filter which concerns on this invention. It is a perspective view which shows the state which opened the cover of the noise filter which concerns on this invention. It is a circuit diagram which shows an example of the filter circuit which comprises the noise filter which concerns on this invention. It is an expansion perspective view which shows the vicinity of the switch operation part of the noise filter which concerns on this invention. It is an enlarged rear view which shows the vicinity of the switch operation part of the noise filter which concerns on this invention. FIG. 5 is a cross-sectional view taken along line A-A ′ of FIG. 4. It is an expansion perspective view which shows the cover vicinity in the state which opened the cover of the noise filter which concerns on this invention. It is an expansion perspective view which shows the cover of the noise filter which concerns on this invention. It is an expansion perspective view which shows the engaging part vicinity of the cover of the noise filter which concerns on this invention. It is an enlarged view which shows the engaging part of the cover of the noise filter which concerns on this invention. It is an expansion perspective view which shows the cover vicinity in the state which closed the cover of the noise filter which concerns on this invention. It is plane explanatory drawing which shows the state which connected the external terminal of the other electronic component which comprises an external circuit to the terminal part of the noise filter which concerns on this invention. It is a perspective view which shows the conventional noise filter. It is a perspective view which shows the state which opened the cover of the conventional noise filter. It is a front view which shows the conventional noise filter. It is a top view which shows the conventional noise filter. It is a side view which shows the conventional noise filter. It is a circuit diagram which shows the filter circuit which comprises the conventional noise filter. It is plane explanatory drawing which shows the state which connected the external terminal of the other electronic component which comprises an external circuit to the terminal part of the conventional noise filter.

10 Noise filter
12 cases
14 Filter circuit
16 Case body
18 Case lid
20 Case base
21 Heat dissipation hole L Common mode choke coil Cx X capacitor Cy Y capacitor R Resistor Sw Switch
22a Recessed case
22b Recessed case
23 Switch operation section
24a Side wall of the case body
24b Side wall of case body
26 Terminal block
28a Bulkhead
28b Bulkhead
28c Bulkhead
28d bulkhead
30a terminal
30b Terminal section
30c terminal
32 terminal screw
34 Screw receiving piece
36 Cover
36a Rear end of cover
36b Tip of cover
38 Cover pin
40 holes
42 Engagement part
42a First inclined surface of the engaging portion
42b Vertical surface of engaging part
42c 2nd inclined surface of engaging part
42d Horizontal surface of engaging part
44 Base mounting hole
46 Earth terminal
46a Vertical plate of earth terminal
46b Horizontal plate of earth terminal
48 Ground screw insertion hole
49 Ground wire outlet
50 Ground screw
52 External terminal X Outer end of terminal block Y Outer end of base Z Distance between outer end of terminal block and outer end of base

Claims (3)

An electronic component constituting the filter circuit is housed in a case formed by closing the lower end opening with a conductive base portion, and a terminal portion is disposed on the upper portion of the terminal block formed on a pair of opposite side walls of the case. A noise filter formed by forming a ground terminal portion on the base portion,
A noise filter characterized in that the ground terminal portion is formed long along the side wall portion of the case, and a plurality of ground wire connection portions are formed in the ground terminal portion.   The noise filter according to claim 1, wherein the ground wire connection portion is a ground screw insertion hole through which a ground screw to which a ground wire is connected is inserted.   3. The noise filter according to claim 2, wherein three ground screw insertion holes are formed at both end positions and a center position of the ground terminal portion.

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