JPH0135454Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a high voltage coil such as a flyback transformer.

Prior Art In this type of high-voltage coil, the basic requirements are to have a sufficiently high withstand voltage and to increase the number of turns of the coil. However, increasing the number of turns increases the inductance of the winding itself and also increases the distributed capacitance between layers, lowering the self-resonant frequency and lowering the operating frequency. As a means to solve this problem, the windings of each layer are wound in alignment so as to form a single layer, and the end of the winding of the first layer is connected to the winding of the other layer wound on top of the winding of the other layer. By connecting diodes in the same direction between the winding start end and the end of the winding, the distributed capacitance between the winding layers is lowered, the self-resonant frequency is raised, the operating frequency is increased, and the current trend is sufficiently high. Compatible high voltage coils have been proposed. Such a high voltage coil is generally called a multi-singler type. FIG. 1 is an electrical equivalent circuit diagram of a multi-singler type high voltage coil (flyback transformer), showing the winding end of the first layer coil 101 and the second layer coil 102 wound on this coil 101. A diode 201 is connected between the winding start end A of the coil 102 and the winding start end A of the third layer coil 103 wound on this coil 102 and the winding end B of the coil 102. As if connecting the diode 202, from the winding ending end (b) of the lower coil to the winding starting end (a) of the upper coil,
Diodes are repeatedly connected in series so that the polarities are in the same direction.

When installing the diodes 201 to 20n in the multi-singular type high voltage coil, conventionally the coils 101 to 20n are installed as shown in FIG.
Flange portions 31 and 32 are integrally connected to both axial ends of a coil bobbin 3 made of plastic wound with 10n, and diodes 201 to 20n are provided on the axial end surfaces of the flanges 31 and 32. A corresponding terminal mounting portion 33 is integrally formed, and a metal terminal 4 made by punching a brass plate or the like is fitted into the mounting hole 34 formed in the terminal mounting portion 33. The diode 2 is placed in the notch groove 41 in the shape of
A lead wire of 0.01 to 20 nm was fitted, the tip thereof was wound several times, and then fixed by soldering. In addition, a structure in which a round bar-shaped metal terminal is used as the metal terminal 4 is also known.

Note that the terminals of the coils 101 to 10n are also connected to the diodes 201 to 20n at the metal terminals 4.

Problems with the Prior Art However, the coil bobbin 3 made of plastic is provided with the terminal attachment portion 33, and the terminal attachment portion 33 is
Since the structure is such that the metal terminal 4 is attached to the metal terminal 4 and the lead wires of the diodes 201 to 20n are soldered and fixed to the metal terminal 4, the following drawbacks occur.

(a) The heat generated during soldering of the lead wires of the diodes 201 to 20n weakens the terminal mounting portion 33 made of plastic, reducing the mounting strength of the metal terminal 4 and causing mounting play, resulting in poor reliability. decreases.

(b) If such a drawback is to be avoided, the thickness of the mounting portion 33 must be increased, leading to an increase in the overall size.

Purpose of the present invention The purpose of the present invention is to solve the above-mentioned problems and provide a high-voltage coil with a structure in which the terminal portion has high heat resistance and does not cause a decrease in terminal mounting strength or looseness due to soldering heat, etc. shall be.

Structure of the present invention In order to achieve the above object, the present invention has developed a high voltage coil bobbin made of plastic, which is wound in multiple layers with an insulating layer interposed between the layers, and the coils in each layer are connected in series through diodes. In the coil, the coil bobbin has flanges at both ends in the axial direction, and terminals, which are separate parts from the coil bobbin, are attached to mutually corresponding positions on both the flanges, and the terminals are separated from the coil bobbin. A metal part is formed on the surface of a heat-resistant insulating base with high heat resistance, and the diode is disposed between the terminals attached to corresponding positions on both the flanges, and the lead wire is connected to the terminal. It is characterized in that it is soldered to the metal part.

Embodiment FIG. 3 is a perspective view of the main parts of the high voltage coil according to the present invention. In this embodiment, a terminal attachment part 33 is formed on the outer surface of the flanges 31 and 32 provided at both ends of the coil bobbin 3 in the axial direction, a rod-shaped terminal 5 is inserted into the terminal attachment part 33, and a diode is connected to the terminal 5. 20
It has a structure in which both ends of a 1 to 20n lead wire are wound and connected and fixed.

Conventionally, the terminal 5 was made of a metal rod or a metal plate, but in the present invention, a metal part is formed on the surface of a heat-resistant insulating base that has higher heat resistance than the coil bobbin 3. . Fourth
The figure shows a specific example. For example, a metal portion 52 is formed on the surface of a base 51 made of a heat-resistant insulating material such as glass epoxy resin or ceramic by sintering or plating silver or copper. The structure is such that the lead wires of the diodes 201 to 20n are fixed to the portion 52 by soldering. In addition to this, copper-clad laminates and the like can also be used.

With such a structure, the following effects can be obtained.

(a) The base 51 is made of a heat-resistant insulator such as glass epoxy or ceramic, and acts as a kind of heat insulator,
When the lead wire is soldered to the metal portion 52 of the terminal 5, heat conduction from the terminal 5 to the coil bobbin 3 is hindered, and the terminal attachment portion 33 is prevented from becoming soft due to solder heat. Therefore, it is possible to obtain a highly reliable high-voltage coil that does not suffer from the problems that could not be avoided when using metal terminals, ie, a decrease in the terminal mounting strength due to soldering heat, and the generation of backlash.

(b) Since softening of the terminal mounting portion 33 due to soldering heat can be prevented, the terminal mounting portion 33 can be made smaller and thinner, and the overall shape can be reduced.

(c) By reducing the size of the terminal mounting portion 33, it is possible to ensure a sufficient insulation distance between the terminals and improve the insulation withstand voltage characteristics.

(d) Since the terminal 5 is composed of the heat-resistant insulating base 51, which itself basically becomes an insulator, insulation treatment is easy.

There are various aspects regarding the terminal 5 and its mounting structure. Examples are shown in FIGS. 5-7. First, in the embodiments shown in FIGS. 5 and 6, the structure of the terminal 5 is such that a flat insulating base 51 made of a heat-resistant insulator is used, a metal portion 52 is formed on one surface thereof, and a notched groove 53 is formed on one surface of the insulating base 51. The terminal 5 is inserted into a terminal mounting portion 33 provided on the collar portions 31 and 32 of the coil bobbin 3.

Next, in the embodiment shown in FIG. 7, in order to connect a plurality of diodes to one terminal 5, a plurality of metal parts 521, 522 are arranged on one surface of the flat insulating base 51.
and a terminal 5 provided with a plurality of notch grooves 531, 532.
The terminals 5 are attached to the outer surfaces of the flanges 31 and 32 by adhesive or by a combination fitting structure of protrusions and holes. Even when the terminal 5 having such a large structure is used, since the terminal itself is made of an insulator, a sufficient insulation distance can be maintained and the necessary withstand voltage can be secured.

Effects of the present invention As described above, the present invention provides a high-voltage coil in which a coil bobbin made of plastic is wound in multiple layers with an insulating layer interposed between the layers, and the coils in each layer are connected in series through diodes. The coil bobbin has flanges at both ends in the axial direction, and terminals, which are separate parts from the coil bobbin, are attached to corresponding positions on both flanges, and the terminals are made of a heat-resistant insulating base that has higher heat resistance than the coil bobbin. A metal part is formed on the surface, and the diode is placed between terminals attached to corresponding positions on both collar parts, and its lead wire is soldered to the metal part of the terminal, so it is made of plastic. In coil bobbins, which inherently have low heat resistance, the terminals have high heat resistance, and the terminals do not lose their mounting strength or come loose due to soldering heat, etc., and are high enough to support the diode stably and reliably. We can provide reliable high voltage coils.

[Brief explanation of the drawing]

Fig. 1 is an electrical equivalent circuit diagram of a multi-singler type high voltage coil, Fig. 2 is a perspective view showing a conventional connection structure of a diode to a coil bobbin, and Fig. 3 is a perspective view of the main part of the high voltage coil according to the present invention. Fig. 4 is a perspective view of a terminal, Fig. 5 is a perspective view of main parts in another embodiment of the high voltage coil according to the present invention, Fig. 6 is a perspective view of the terminal, and Fig. 7 is a perspective view of yet another embodiment of the high voltage coil according to the present invention. FIG. 3 is a perspective view of main parts. 101~10n...Coil, 201~20n...
... Diode, 3 ... Bobbin, 31, 32 ... Flange section, 5 ... Terminal, 51 ... Insulating base, 52 ... Metal part.

Claims (1)

[Scope of claims for utility model registration] (1) For coil bobbins made of plastic,
In a high voltage coil in which the coil is wound in multiple layers with an insulating layer interposed between the layers, and the coils in each layer are connected in series through diodes, the coil bobbin has flanges at both ends in the axial direction, and the coil bobbin has flanges at both ends in the axial direction, and the coil bobbin has flanges at both ends in the axial direction, and Terminals, which are separate parts from the coil bobbin, are attached to positions corresponding to each other, and the terminals are formed by forming metal parts on the surface of a heat-resistant insulating base that has higher heat resistance than the coil bobbin, and the diode is . A high-voltage coil, characterized in that the coil is disposed between the terminals attached to corresponding positions of both the flanges, and the lead wire thereof is soldered to the metal portion of the terminal. (2) The high-voltage coil according to claim 1, wherein the insulating substrate constituting the terminal is made of glass epoxy resin or ceramic. (3) The high-voltage coil according to claim 1 or 2, wherein the metal portion of the terminal is made of metal sintering or metal plating.