JPS60210819A - Transformer - Google Patents

Abstract

PURPOSE:To obtain a transformer for switching power supply which ensures high occupation rate of winding, easily acquire the insulation distance of each part and simple assembling work by forming a coil through stacking of a plurality of divided coils each of which has the insulation case. CONSTITUTION:A unit coil is formed by inserting a ring-shaped coil 12 to an insulation 5 having the edges 5a, 5b at the internal and external circumferences. A plurality of unit coils thus formed are stacked and a magnetic core 4 is inserted thereto, thus forming a transformer. In this case, since an overlap part 5c is provided mutually to the insulation case, insulation distance between the primary and secondary winding and between the winding 2 and magnetic core 4 can be acquired easily. Since a common insulation case is used for each of divided coils, occupation rate of winding can be improved and a transformer size can be as much reduced. Moreover, automatic winding and assembling can be realized easily.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a transformer used in a switching type DC stabilized power supply (hereinafter referred to as a switching power supply) used in consumer equipment, industrial equipment, and all other equipment. Regarding.

(Conventional configuration and its problems) In general, in switching power supplies, it is necessary to minimize the leakage inductance and distributed capacitance of the transformer (for converter or inverter) due to the frequency handled. There are rolls etc. In FIG. 1, in the case of sand inch winding, l is a bobbin, 2 is an enameled electric wire, 3 is an insulating film or tape, and 4 is a magnetic core.

In this case, there are restrictions on the insulation distance between the primary and secondary and between the winding magnetic cores due to safety standards, and in the European example, it is 8 mm or more, so in Figure 1, the distance is required to be 4+wm or more. Second
The figure shows what is called split winding, with 1 being a bobbin, 2 being an enameled wire, and 4 being a magnetic core.

In this case, the thickness of the collar of the bobbin between the primary and secondary bobbin (t
), the creepage distance (jL, ), and the distance between the winding and the magnetic core (see, ) are subject to regulation. In any case,
Due to this dimensional regulation, the space factor of the winding becomes poor, the shape becomes larger, and the winding work becomes more complicated, resulting in higher costs.

(Objective of the Invention) The present invention solves these conventional problems, and provides a switching type direct current that has a good winding space factor, can easily secure insulation distances between various parts, and is easy to assemble and structure. The purpose is to provide transformers for stabilized power supplies.

(Description of Embodiment) Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 3 shows an exploded perspective view of a unit winding part in the present invention, and shows an annular coil 2 in an insulating case having edges 5a and 5b as shown in the inner and outer peripheries, respectively. 5 to form a unit coil. Coil 2 is
For example, it can be easily formed by winding a cement wire as shown in the figure and heating it with electricity. A transformer as shown in FIG. 4 is completed by stacking a plurality of unit coils constructed in this manner and inserting the magnetic core 4 therein. In this case, since the insulating case 5 is provided with mutually overlapping portions 5c, the insulation distance between the primary and secondary and between the winding and the magnetic core can be easily secured. It goes without saying that an insulating plate 6 or the like is inserted at the end of the unit coil.

(Effects of the Invention) As explained above, the present invention uses a common insulating case for each divided coil, and therefore has the following effects.

(1) The space factor of the winding section can be increased, and therefore the size can be reduced.

(2) It is very easy to mechanize and automate winding and assembly. Therefore, the price can be reduced.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of a transformer showing conventional examples, FIGS. 3 and 4 show an embodiment of the present invention, FIG. 3 is an exploded perspective view of a unit winding section, and FIG. The figure is a cross-sectional view of the entire transformer. 2... Coil, 4... Magnetic core, 5... Insulating case. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] In a switching DC stabilized power supply transformer in which the primary winding or the secondary winding is divided into parts, an insulating case is used for each divided coil to provide insulation between the coils and between the coil and the core. A transformer characterized by forming a coil by stacking multiple units.