JPH0631125U - Step-up transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] Lead wire 51a derived from the inside of the outer winding 50
Prevent the dielectric breakdown from approaching the high voltage part of the outer winding 50. [Structure] A bobbin 10 having a base portion 11 in which terminals 20 are implanted and a winding shaft 12, an inner winding 30 wound around the winding shaft 12, and an outer winding 50 positioned outside the inner winding 30. With the base part 11
The first slit 14 and the second slit on the two sides of
15 to form the lead wire of the inner winding 30 through the first slit 14 and the outer winding through the second slit 15.
In the step-up transformer in which the lead wire 51 of 50 is drawn, the inner peripheral surface 55 of the outer winding 50 and the second slit in the bobbin 10
The engaging part 19 is formed near the intersection of 15 and the outer winding
The lead wire 51a at the winding start end of 50 is hooked on the engaging portion 19 and pulled out.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a thin step-up transformer having a low voltage inner winding and a high voltage outer winding, and relates to an improvement of Japanese Patent Application No. 4-89482 previously filed by the applicant.

[0002]

[Prior art]

 FIG. 1 is a front sectional view of an essential part showing a configuration example of a conventional step-up transformer. The bobbin 10 is provided with a base portion 11 in which a plurality of terminals 20 are planted on two opposite side surfaces, and a cylindrical winding shaft 12 projecting upward from the center of the base portion 11, and at the upper end of the winding shaft 12. Has a tsuba 13. The side surface of the base portion 11 on which the terminals are planted is provided with a slit 14 reaching up to the vicinity of the winding shaft 12 and a slit 15 shallower than this. Although not shown, the lead wire of the inner winding 30 on the low voltage side wound around the winding shaft 12 is pulled out to the lower side of the bobbin 10 through the slit 14, and one side surface of the base portion 11 is provided. Connected to terminal 20 of. Further, an outer winding 50 having a high voltage is attached to the outside of the inner winding 30 via a ring 40 made of an insulating material, and lead wires 51a and 51b thereof are passed through the slit 15 and below the bobbin 10 as shown in FIG. And is connected to the terminal 20 on the other side surface of the base portion 11. The center leg of the E-shaped core 70 is inserted into the winding shaft 12, and the core 70 and the flat plate-shaped core 60 are fixed to each other.

[0003]

[Problems to be solved by the device]

 Since the outer winding 50 is wound in multiple layers in a line from the inner side to the outer side, the inner side has a low potential and the outer side has a higher potential. However, the lead wire 51a at the beginning of the winding, which is led out from the inside of the outer winding 50, slides in the slit 15 when being connected to the terminal 20, and is pulled out to the outside of the outer winding 50. There is. Then, this lead wire 51a passes near the higher potential portion of the outer winding 50 and the lead wire 51b at the end of the winding where the voltage is the highest, and discharges and insulates between the two with a large potential difference. It could be destroyed.

[0004]

[The purpose of the device]

 An object of the present invention is to provide a step-up transformer in which a lead wire 51a led out from the inside of the outer winding 50 does not approach the high voltage portion of the outer winding 50 and cause dielectric breakdown.

[0005]

[Means for Solving the Problems]

 According to the present invention, an engaging portion is formed in the bobbin 10 at a position near the inner peripheral surface of the outer winding 50 and the slit 15 and the lead wire at the winding start end of the outer winding is hooked on the engaging portion. It is characterized by the structure of a step-up transformer that pulls out to the terminal.

[0006]

【Example】

 FIG. 3 is a bottom view of an essential part showing an embodiment of the step-up transformer according to the present invention. The same parts as those in the prior art are designated by the same reference numerals in the following drawings. The transformer shown in FIG. 3 is different from the conventional one in the shape of the slit 15 provided in the bobbin 10 for drawing out the lead wire 51 of the outer winding 50. That is, in this bobbin 10, the engaging portion 19 is formed by widening the width of the tip of the slit 15 located near the inner peripheral surface 55 of the outer winding 50. The lead wire 51a at the beginning of the outer winding 50 is pulled out to the lower surface of the base portion 11 so as to be hooked on the engaging portion 19, and further hooked on the protrusion 18 provided near the base of the terminal 20 to be connected to the terminal 20. Has been done. Since the lead wire 51a is engaged with the engaging portion 19, even if the lead wire 51a is strongly pulled when connecting to the terminal 20, it does not move in the slit 15 in the outer peripheral direction of the outer winding 50.

The engaging portion 19 is not limited to the method of widening the width of the slit 15 and can be provided by another means. FIG. 4 shows another embodiment, in which a downward protrusion is formed integrally with the base portion 11 on both sides of the slit 15 near the inner peripheral surface 55 of the outer winding 50, and the protrusion is engaged. It is the joint section 19.

[Effect of device]

 According to the present invention, since the lead wire at the beginning of the outer winding engages with the engaging portion and is held so as not to approach the high voltage portion of the outer winding, insulation breakdown in the outer winding portion is prevented. It has the effect of preventing the occurrence.

[Brief description of drawings]

FIG. 1 is a front sectional view of a main part showing a conventional example of a step-up transformer.

FIG. 2 is a bottom view of the main part of the transformer.

FIG. 3 is a bottom view of an essential part showing an embodiment of the present invention.

FIG. 4 is a bottom view of an essential part showing another embodiment of the present invention.

[Explanation of symbols]

 10 bobbin 11 base part 12 winding shaft 15 slit 19 engaging part 30 inner winding 50 outer winding 51 lead wire 55 inner peripheral surface of outer winding

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Asahi Hiura 18 Gomigaya, Tsurugashima City, Saitama Prefecture Toko Co., Ltd. Saitama Plant

Claims (3)

[Scope of utility model registration request] 1. An insulative bobbin having a base part in which terminals are planted on two opposite side surfaces and a winding shaft projecting upward from substantially the center of the base part, and an inner winding wound on the winding shaft. A wire and an outer winding located outside the inner winding, and a first slit and a second slit are formed on the two side surfaces of the terminal of the base part implanted, respectively, and the inner winding is passed through the first slit. In a high-frequency step-up transformer in which the lead wire of the outer wire is drawn out and the lead wire of the outer winding is drawn through the second slit, the bobbin is engaged at a position near the inner surface of the outer winding and the second slit. And a lead wire at the winding start end of the outer winding is hooked on the engaging portion and pulled out to the terminal. 2. The step-up transformer according to claim 1, wherein the engaging portion is formed by widening a width of a part of the slit. 3. The step-up transformer according to claim 1, wherein the engaging portion is a protrusion formed on the lower surface of the bobbin.