JPS62293705A - Small-sized transformer - Google Patents

Abstract

PURPOSE:To improve safety, to reduce cost and to miniaturize a small-sized transformer by using an electric wire with two layers or more of insulating layers, the total thickness of the whole layers of which extends over 5-500mum. CONSTITUTION:Insulating layers in electric wires employed for a primary winding 7 and a secondary winding 9 are formed in multilayers, and the total thickness of the insulating layers is brought to 5-500mum. The electric wire having three-layer insulating structure in which the film 2 of polyester in 10mum is attached onto the surface of a wire such as a copper wire 1, the film 3 of polyester imide in 20mum is annexed onto the film 2 and the film 4 of polyester in 10mum is affixed onto the film 3 is manufactured. The electric wires are employed for the primary winding 7 and the secondary winding 9 and the primary winding 7 is wound on a bobbin 6, and the secondary winding 9 is wound onto the primary winding 7 without particularly executing insulating treatment, and cores 5 are incorporated, thus shaping a transformer. Accordingly, an insulating tape, etc., are unnecessitated, keeping the safety of insulation, thus miniaturizing the transformer.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a winding structure that takes into consideration the safety of transformers for switching regulators, for which there is a particularly strong demand for miniaturization in recent years.

[Conventional technology]

Conventionally, the winding structure that has been considered to be the safest among the winding structures of transformers for switching regulators is as shown in FIG. Insulating tape 11 to ensure the insulation distance of yA9.
etc., wind the primary winding 7 between them, wrap three or more layers of sufficiently wide insulating tape 8 on top of it, and then
Wrap the insulating tape 12 in the same manner as above, wrap the secondary winding 9 between them, wrap the insulating tape 10 on top of it, and then
The lead-out portions of the secondary winding 7 and the secondary winding 9 were covered with insulating tubes.

[Problem that the invention seeks to solve]

With this conventional winding structure, the work is complicated, and not only is the defect rate high due to insufficient insulation distance due to work errors, but it is also difficult to design a small transformer in order to wrap the insulation tape 11, 12 to ensure the insulation distance. , it was very difficult.

In addition, the wire-wound structure required high labor costs.

The present invention can solve these problems and provide a switching regulator transformer that is highly safe, inexpensive, and more compact.

[Means for solving problems]

In order to eliminate the insulating tape 11 and 12 for ensuring insulation distance, which was the biggest drawback in the conventional winding structure, the primary winding 7
The electric wire used for the secondary winding 9 has multiple insulation layers to ensure safety.

〔Example〕

A 10 μm polyester film 2 is applied to the surface of the copper wire 1, a 20 μm polyester imide film 3 is applied on top of that, and a 10 μm polyester film 4 is applied on top of that.
Make an electric wire with a three-layer insulation structure.

゛Separately, a 10 μm natural-colored polyurethane film 2 is applied to the surface of the copper wire 1, a 20 μm polyurethane film 3 colored green is applied on top of that, and a 10 μm colored red polyurethane film 3 is applied on top of that. polyurethane film 4
If it has a three-layer insulation structure with , it is possible to identify it as a multi-layer insulation component.

FIG. 3 shows that the electric wire with the three-layer insulation structure shown in FIG. 1 is used for the primary winding 7 and the secondary winding 9, the primary winding 7 is wound around the bobbin 6, Secondary winding 9 without special insulation treatment
FIG. 2 is an internal structural diagram of a transformer incorporating a core 5 that winds the core 5.

Also, instead of winding the secondary winding 9 over the primary winding 7 as shown in Fig. 3, the primary winding can be wound around the secondary winding 9.
It is also possible to wind the primary winding 7 and the secondary winding 9 at the same time.

〔Effect of the invention〕

According to the present invention, the reliability (safety) of insulation is the same as before.
However, since the conventionally used insulating tape 11, 12, etc. are no longer necessary, the transformer can be made smaller.

Further, if the primary winding 7 and the secondary winding 9 are wound at the same time, the coupling between the primary winding 7 and the secondary winding vA9 will be improved, and the efficiency of the transformer will be improved.

Furthermore, it eliminates the need for work such as insulating tape processing, which is a major cost advantage.

[Brief explanation of the drawing]

FIG. 1 is a diagram of the insulation structure of a multilayer insulation 8M electric wire according to the present invention, FIG. 2 is a diagram of the conventional transformer structure, and FIG. 3 is a diagram of the transformer structure of the present invention. 1: Copper wire. 2: Film. 3: Film. 4: Film. 5: Core. 6: Bobbin. 7: Primary winding. 8: Insulating tape. 9: Secondary winding. 10: Insulating tape. 11: Insulating tape. 12: Insulating tape. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A small transformer characterized by using an electric wire having two or more insulating layers with a total thickness of 5 to 500 μm.