TW425582B - Inductance device - Google Patents

Abstract

In an inductance device in which a coil is wound around a bobbin having at least two chambers divided by a collar and a ferrite core is mounted, the bobbin includes a chamber having a center hole for inserting a center leg of the core and two outer holes for each inserting an outer leg of the ferrite core in a bottom portion of the bobbin, a shield coil having a portion which is wound in a direction perpendicular to the primary coil via the collar portions of the bobbin, both ends of the shield coil being connected to a terminal, the shield coil is formed by a triple-layered insulated wire.

Description

-425582 V. Description of the invention (l) --- [BACKGROUND OF THE INVENTION] The present invention relates to a transformer and inductor used in a switchin reguUhr, and particularly to the use of a split-type bobbin. ) Transformers and inductors. 'Xi = sheltered in various transformers and inductors for switching power supplies' magnetic flux leakage to the outside occurs during the operation of transformers and inductors. In order to shield the leakage magnetic flux ', a method is generally used, and the middle-copper plate shielding ring is provided on the side surface of the transformer via a peripheral portion of an iron core, as shown in FIG. In addition, as shown in Japanese Utility Model Registration No. 251 825, Utility Model Registration No. 25 1 8241, the disclosed method consists of using-conductor-shielding coils and non-using copper plate shielding rings to obtain a similar copper plate The shielding effect of the shielding ring. The conventional transformers and inductors face the following problems. Although the manufacturing of transformers and inductors is usually automated, as shown in FIG. 6, in the manufacturing method of installing a copper plate shielding ring on the side surface of the transformer and inductor, manual installation and connection are still mainstream, and The large number of manufacturing steps prevents the simplification and automation of the process. Although a method has been proposed in which, as shown in Fig. 7, an upper ring shaft portion 70 is provided with a chamber 'and a shield coil 74 is formed by a wire instead of using a thin plate shield ring. In this structure, a winding start end and a winding end of one of the loops are connected to a terminal 7 and are inserted into a loop shaft portion 70 of an upper reel to form a short circuit loop. Therefore, the terminal 71 requires a welding process, and in order to complete the transformer, the welding of the side spool terminals 79 is required to be performed twice in total. Head

V. Description of the invention (2) Therefore, 'the number of manufacturing steps is increased, which is undesirable. On the other hand, in FIG. 8, a shield wire 形式 8 4 in the form of a short circuit loop is formed by a wire, and After the core and the bobbin are combined, the 'shield coil 84 is assembled into two shield coil accommodating portions 81, and the shield coil accommodating portion 81 is formed in an upper ring shaft portion 80 of a reel. Therefore, there is a problem in the stability of the shield coil 84, and the step of manufacturing the shield coil needs to be separated ', which is undesirable. In the above-mentioned structure of the shield coil using a wire, only the leakage magnetic fluxes in the vertical direction of the transformer and the inductor can be shielded, and the effect of the leakage magnetic flux on all side surfaces of the outer legs of the core cannot be obtained. [Summary of the Invention] In view of the above-mentioned problems, an object of the present invention is to provide an inductive device 'which simplifies or automates a process of forming a shielded coil using a wire' and which is provided with a shielding effect. That is, according to the present invention, the above-mentioned object is achieved by providing an inductive device having a winding coil. The spool has at least two chambers divided by a ring shaft and a terminal embedded in the spool. A coil is wound around the coil, and a ferrite magnet core is installed, wherein the spool includes a chamber having a central hole, a central leg for receiving the core, and two external holes. The outer legs of the ferrite magnet core are respectively received at the bottom of a reel, and a shield coil has a part wound around the upper loop of the reel and the surrounding room, and forms a perpendicular to the other reel chambers. The direction of one of the windings of the shield coil is connected to the winding spool terminal by one winding end and one winding end, thereby forming a short circuit, or when an inductive device is installed

8811 Fang 3 ‘ptd Page 6 ^ 25BS2 Five’ Description of the Invention (3) When it is set on a printed circuit board, it is short-circuited to the surface of a substrate. In addition, because in the application of small transformers, such shielded coils may contact a primary coil and a primary coil wound around other rooms, the shielded coil can be formed with a safety structure by using a three-layer insulated wire. To meet the purpose of transformer safety standards. [Brief description of the drawings] Fig. 1 is a perspective view of a first specific example of the transformer of the present invention; Fig. 2 is a front view of the first specific example; Fig. 3 is a cross-sectional view thereof; A side view of a specific example; FIG. 5 is a cross-sectional view thereof; FIG. 6 is a conventional transformer having a copper plate shielding ring; FIG. 7 is a schematic diagram illustrating a conventional example of a shielding method using a wire Figure 8 is a simplified diagram illustrating a first example of a conventional shielding method using a wire; and Figure 9 is a perspective view of another specific example of the present invention, in which the configuration of a ferrite core and 圊 1 different. [Explanation of component number] 1 ..........., .. Ferrite magnet core 2 ............. Coil 2-1 to 2-1 1 .. ... Coil 3 .............. .. Reel 4 .............. Shielded Coil

88113773.ptd Page 7 V. Description of the Invention (4) 5 ............. Room 5 ~ 1 ~ 5-11 ..... Room 9 ........ ..... Terminal 10a .............. Roller upper ring shaft protrusion 10b ........... Reel upper ring shaft protrusion

11 ............ Room 12 ............ External hole 70 ............ Spool ring upper part 71 ............ Terminal 74 ............ Shielded coil 79 ............ Terminal 80 ....... ..... The upper ring shaft part 81 of the reel ......... shield_coil accommodating part 84 ......... shield coil 89 ... ......... Terminal [Detailed description of preferred specific example] A first specific example of the present invention will be described below with reference to FIGS. 1 to 5. ► Figure 1 is a first specific perspective view of a transformer for a switching power supply, where component number 1 indicates a ferrite magnet core 'and example number 3 indicates a spool. The reel is provided with a chamber. This chamber 1 has a central hole, which is used to insert the central leg of the ferrite magnet core and has a pair of external holes. 1 2. It is used to insert at the bottom of the reel. A pair of iron core external feet. A shield coil 4 has a portion perpendicular to the other spool shaft chambers, is wound around the chamber through the upper loop shaft protrusions 10a and 10b drawn by the spool, and is connected to

Page 8 425 ^^ 2 V. Description of the invention (5) Reel terminal 9. Fig. 2 is a front view, illustrating a portion of the shield coil perpendicular to the other coils, and both ends of the coil are connected to the terminals 9 of the spool 3. Fig. 3 is a cross-sectional view thereof. Fig. 4 is a side view. In view, the reel 3 has a ring shaft at its upper and lower ends, and has a total of】】 rooms 5_} to bu]〗 ^ in between. There are a primary auxiliary coil, a primary coil 2-2, a primary main line 圏 2_3, a primary coil 2_4,-, a primary main coil 2-5, a primary coil 2_6, a primary coil 2_7, —: Coils 2-8, a primary main coil 2_9, a primary coil 2_1〇, _ ,, · main line = 2-11. For these coils, after the winding is started effectively = chamber 5 -11 on the bobbin terminal side up to chamber 5 -1, Fu Mi 4 Q coil shield coil 4 is wound around the lower part of the reel 3 In the invention of the shielded wire, the portion of the coil 1 is opened through the ring-shaped protrusions 10a and 10b on the upper part of the spool, and is guided to the spool terminal 9 > in a vertical cross-sectional view. These coils are treated in a single welding step ^: Don't be a child. Therefore, because of the unique characteristics of the present invention, the shielded wire, the coil of the device; compared with the conventional use-copper plate; shield; the advantages of the manufacturing process. In addition, since the secondary coil is made in a small device, the shielded coil can be used to meet the transformer safety standards by using one, two, or a safety structure: Purpose-== 中 任-The layer is damaged by insulation, and the remaining two ^ = 881] 3773.pld Page 9 425582 V. Description of the invention (6) Although the foregoing transformer example has been used to explain 'in addition to transformers, the present invention is also applicable to other applications where the magnetic flux is greatly changed', for example, for active use The inductor β of the wave filter shows the evaluation data of the shielding effect when the shielding coil 4 is mounted on the transformer. [Evaluation method] The difference between the induced voltage when a shielded coil is provided and when a search coil is not used is compared. ......... _, ,,

Taste shielded coil 4 with shielded wire wish X

Decrease about 4 $% ------ Sense of transformer-should t ~ i [mV] 1 '1 丨 ι 23

130 Induced voltage on the outer leg of the eerU core back [mV] Comments on the 4 screens of the closed circle " 樯: p 』^ _ τ: ----------- the shape of the ferrite core 1.22 mi 3 5 mm Measurement conditions • = [! 1 u] before the junction * 'can be used to realize the full power and inductance of the switching power supply, which has magnetic leakage shielding on the upper side of the transformer and the outer side of the iron core ^ side surface Pass' this shielding coil and other coils-and one side

HH 5 5 8 2 V. Description of the invention (7) The series is wound during the winding process and can be made in a single welding step. Therefore, no manual operation is required to attach a shield ring using a copper plate or a wire, so that the manufacturing process of the transformer and the inductor can be simplified. In addition, since the shield coil and the bobbin are integrated by winding, the fixed state of the shield coil is stable, and automation becomes possible.

S8113773.ptd Page 11

Claims (1)

42558 2 VI. Scope of patent application 1. An inductance-ferrite magnet-reel spool, a chamber, the central leg of the ring shaft center, receiving the ferrite obstructing a terminal, a primary coil of which a shield coil faces perpendicular to the initial connection to the terminal The device 'contains: a body iron core, which includes a central leg and an outer side, which includes a toroidal shaft portion, and the feet' to σ 丨 the pseudo β helical shaft portion defines at least one central hole for receiving the < The acid salt magnets two and two external holes are each used in the spool; = the outer leg of the body core; embedded in the spool; 'It is wound around the chamber of the spool, and 'It has a part wound around the loop shaft part of the reel and the direction of the stage coil, and both ends of the shield coil are formed by' the shield coil is formed by three layers of insulated wires. 4 Page 12