JPH056821U - Substrate type noise filter - Google Patents

Abstract

(57) [Abstract] [Purpose] A substrate type noise filter in which the coils are arranged in two layers, the coils are easily fixed, and the electrical withstand voltage characteristics are improved. [Structure] Circuit elements other than the coil 8 are mounted on the wiring board 1, and a toroidal choke coil 8 is formed on the outer surface of the vertical groove 1.
The legs with 0 are placed on the insulating base 7 at the four corners, the ends of the windings 9 are hung down through the vertical grooves 10 and mounted on the substrate. Trapezoid cover 1
Reference numeral 1 designates long legs provided at four corners of a base plate which is slightly larger than the insulating base 7. The long legs are provided with ridges on the inner side surface and locking claws 21 are provided at the tips. An engaging hole 16 corresponding to the locking claw 21 is formed in the substrate 1. A ridge is fitted in the vertical groove of the insulating base 7 to hide the end of the winding 9, and the locking claw 21 is inserted into the engaging hole 16 to attach the trapezoidal cover 11 to the substrate. Trapezoidal cover 11
Contacts the coil 8. [Effect] Since the vertical movement of the two-layer coil can be suppressed to prevent the winding from swinging, and the electric withstand voltage characteristic is excellent, the reliability is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a board-type noise filter for suppressing electromagnetic noise applied to home appliances such as air conditioners and electronic devices.

[0002]

[Prior Art]

 The conventional board-type noise filter has a structure in which circuit elements are simply arranged and mounted on a wiring board, and cannot be applied to recent home appliances that have been miniaturized by high-density mounting. As a board-type noise filter with a small installation area and high-density mounting, circuit elements other than common mode choke coils (hereinafter referred to as coils) are mounted directly on the board, and the coils are installed on the four corners above the circuit elements. A structure is considered in which the coil is placed on an insulating base and the ends of the winding are hung along the legs to be mounted in a two-layer arrangement.

[0003]

[Problems to be solved by the device]

 In the case of the structure in which the coil is arranged in two layers, the ends of the hanging windings are inserted into the through holes of the board and soldered to the wiring conductors on the board to fix the coil. The coil is relatively heavy and needs to be more firmly secured.

An object of the present invention is to mount a coil in a two-layer arrangement and easily and firmly fix the coil, yet maintain an electric withstand voltage between the coil and a housing of a device, and a board-type noise filter having a small installation area. To provide.

[0005]

[Means for Solving the Problems]

 The board-type noise filter according to the present invention has a filter circuit element, excluding the coil, mounted in the center of the wiring board, a toroidal common-mode choke coil above these circuit elements, and legs with vertical grooves on the outer surface at the four corners. It is mounted on the insulation stand provided in the above, and the ends of the windings are inserted through the vertical grooves to be mounted, and in order to maintain the dielectric strength between the coil winding and the surrounding case, there are ridges corresponding to the vertical grooves on the inner surface. Yes, the trapezoidal cover with long legs with outwardly protruding locking claws at the four corners is fitted to the insulating base by fitting the ridges in the vertical grooves, and the locking claws are inserted into the engagement holes of the board. Then, the coil is fixed by being attached to the substrate.

That is, according to the present invention, an external connection plate terminal is mounted near the edge of the wiring board, a filter circuit element except the common mode choke coil is mounted in the central portion of the board, and a toroidal common mode choke is mounted. The coil is placed on an insulating base with vertical grooves on the outer surface at the four corners, the ends of the windings are passed through the vertical grooves and mounted on the wiring board, and the inner surface has ridges and tips. A trapezoidal cover with long legs with outwardly protruding locking claws at the four corners is fitted to the insulating base by fitting the ridges into the vertical grooves, and the locking claws are fitted into the engaging holes of the wiring board. It is a board-type noise filter that is inserted into the wiring board and attached to the wiring board.

[0007]

[Action]

 The trapezoidal cover and the insulating base sandwich the coil to prevent the coil from swinging up and down, and guarantee the withstand voltage characteristic between the coil winding and the metal casing surrounding the device. The long legs of the trapezoidal cover sandwich the ends of the winding with the legs of the insulating base to suppress the runout.

[0008]

【Example】

 An embodiment of the substrate type noise filter according to the present invention will be described with reference to the drawings. As shown in the external perspective view of FIG. 1, a plurality of external connection board terminals (hereinafter referred to as board terminals) 2 are provided on an insulating terminal block 3 along a short side edge of a rectangular wiring board (hereinafter referred to as a board) 1. Circuit elements other than the coil, such as the line-to-line capacitor 4, the line-to-ground capacitor 5, and the surge absorber 6, are attached to the center of the board 1 after they are individually provided. On the other hand, a toroidal common mode choke coil (hereinafter referred to as coil) 8 is placed on an insulating base 7 having legs attached to the four corners of the substrate, and the ends of windings 9 are passed through the vertical grooves 10 of the insulating base 7 and then the substrate. A coil 8 is attached to the unit 1. In the state shown in FIG. 2, the lead wire of the plate terminal 2, the capacitor 4, etc., and the end of the winding wire 9 are connected to the wiring conductor (not shown) on the bottom surface of the substrate 1 by soldering, and then shown in FIG. A trapezoidal cover 11 is attached to form a base plate type noise filter.

In the insulating base 7 shown in FIG. 3, legs 12 of square bars are provided at four corners of a rectangular plate, projecting pieces 13 are provided at central portions of short side edges, and a gap is formed at the central portions so as to face the projecting pieces 13. A pair of protrusions 14 are provided so as to face each other. The long side length is slightly larger than the diameter of the coil 8. The vertical groove 10 is formed on the outer surface of the long side of the leg 12. The length of the leg 12 is such that the insulating base 7 can be arranged so as to cover the capacitors 4, 5 and the like. The flutes 10 have a deep U-shaped cross section. The gap between the projecting pieces 14 is such that the central partition plate 15 of the insulating case of the coil 8 can be loosely fitted therein, and the projecting pieces 13 and 14 are positioning members for the coil 8 mounted on the insulating base 7.

Through holes (not shown) using eyelets and prismatic engagement holes 16 (see FIG. 2, two are shown) are formed in the substrate 1 in an array corresponding to the vertical grooves 10. The trapezoidal cover 11 shown in FIG. 4 has a vertical groove 10 of a leg 12 on a plate made of a substantially square insulating material having the same side length as that of the insulating base 7 and a side length slightly longer than the short side of the insulating base 7. A plate-shaped long leg 17 corresponding to the formed outer surface is provided, and a projecting piece 18 (one is shown) corresponding to the projecting piece 13 and a pair of projecting pieces corresponding to the projecting piece 14 (illustration is shown) on the lower surface of the plate. No) is provided. The length of the long leg 17 is approximately equal to the total height of the insulating base 7 and the coil 8. On the inner surface of the long leg 17, a protruding piece 18 that fits into the vertical groove 10 is provided. The ridge 19 has a cross section with a semicircular vertical groove 20, and the bottom of the vertical groove 10 and the vertical groove 20 serve as a through hole through which the end of the winding 9 can be inserted. At the tip of the long leg 17, a locking claw 21 having an L-shaped vertical section and protruding outward is provided. As shown in FIG. 1, the locking claw 21 is press-fitted into the engagement hole 16 and engages with the bottom surface of the substrate 1.

The trapezoidal cover 11 can be firmly attached to the side of the substrate 1 by the locking claws 21, the coil 8 mounted on the insulating base 7 is pressed from above, and the end portion of the winding 9 is provided with the vertical groove 20. Enclose it and secure the coil 8 firmly.

[0012]

[Effect of the device]

 According to the present invention, it is possible to provide a substrate-type noise filter which has a high-density mounting, good vibration resistance, and excellent withstand voltage characteristics. It is an excellent substrate type noise filter that can be applied to many miniaturized home appliances and electronic devices.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a substrate type noise filter according to the present invention.

FIG. 2 is an external perspective view showing a state before attaching the trapezoidal cover of the substrate type noise filter according to the present invention.

3 is an external perspective view of an insulating base of the substrate type noise filter shown in FIG.

4 is an external view of a trapezoidal cover of the substrate type noise filter in FIG.

[Explanation of symbols]

 1 Wiring Board 2 External Connection Board Terminal 3 Insulation Terminal Block 4, 5 Capacitor 6 Surge Absorber 7 Insulation Board 8 Common Mode Choke Coil 9 Winding 10, 20 Vertical Groove 11 Trapezoidal Cover 12 Leg 13, 14, 18 Projecting Piece 15 Central partition plate 16 Engagement hole 17 Long legs 19 Projection 21 Locking claw

Claims (1)

[Claims for utility model registration] [Claim 1] A board terminal for external connection is mounted in the vicinity of the edge of the wiring board, and a filter circuit element except the common mode choke coil is mounted in the center of the board, and the toroidal Type common mode choke coil is placed on an insulating stand with vertical grooves on the outer surface at the four corners, the ends of the windings are passed through the vertical grooves and mounted on the wiring board, and the inner surface of the ridge There is a trapezoidal cover having long legs with locking claws protruding outward at its four corners at its four corners, and the projections are fitted into the vertical grooves to assemble it on the insulating base, and at the same time, in the engagement holes of the wiring board. Substrate type noise filter that is attached to the wiring board by inserting the locking claws.