JPH06267747A - High-voltage transformer - Google Patents

Abstract

PURPOSE:To provide a high-quality transformer at low cost, by using a smaller number of components effectively with fewer manhours without deteriorating the reliability, and reducing defects caused by the assembling work. CONSTITUTION:A high-voltage transformer includes a coil bobbin 31 with a primary winding 36 and a secondary winding 37 wound around the coil bobbin 31, an insulating holder 39 including a diode mounting part 41 for holding a diode 40 to be inserted in a surrounding face part and a capacitor mounting part 43 for holding a capacitor 42 to be inserted in an end part of the semi- cylindrical body, wherein a core insulating wall 44 is provided between the diode mounting part 41 and the capacitor mounting part 43, a ferrite core 46 assembled in the coil bobbin 31, and an upper insulating case 49 and a lower insulating case 48 mounted on the lower side of the assembled body including the coil bobbin 31 and an insulating holder 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage transformer such as a flyback transformer used in various electronic devices.

[0002]

2. Description of the Related Art In recent years, as the miniaturization of high-voltage transformers used in various electronic devices has progressed remarkably, the characteristics, quality, and reliability of high-voltage transformers must be equal to or higher than those of conventional products. There is a need to supply to users at a lower cost. Therefore, it is necessary to reduce the number of parts of the high-voltage transformer and to provide a structure of the high-voltage transformer that does not require assembling steps.

The structure of a conventional high voltage transformer will be described below. FIG. 2 is an exploded perspective view showing a configuration of a main part of a conventional high-voltage transformer. In FIG. 2, reference numeral 1 denotes a lower winding collar 2, an upper collar 3, and intermediate collars 4a and 4b, which are a primary winding 5 and a secondary winding. A coil bobbin 6 is wound, and a plurality of terminal pins 7 are planted on the lower end flange 2 of the coil bobbin 1.

Reference numeral 8 denotes a semi-cylindrical insulating holder which is constructed so as to cover approximately half the circumference of the coil bobbin 1, which forms a core insulating wall 10 between it and the ferrite core 9, and at the same time forms a secondary winding 6 Intermediate tap terminal 11 for wiring the intermediate tap
And the diode 13 incorporated in the lower insulating case 12.
A dummy terminal 14 for connecting to and is inserted.

The lower insulating case 12 is constructed so that the diode 13, the ferrite core 9 and the capacitor 15 described above are incorporated therein. 16 is an insulating film,
It is inserted between the coil bobbin 1 and the capacitor 15.

Further, the diode mounting portion 1 for mounting the high voltage diode 17 on the outer peripheral portion of the upper end flange 3 of the coil bobbin 1.
8 is provided, and the lower end flange 2 is provided with a dummy terminal insertion hole 19 into which the dummy terminal 14 is inserted. Further, a lead wire insertion hole 20 for the diode 13 and a dummy terminal insertion hole 21 are formed in the insulating holder 8.

Further, the lower insulating case 12 is provided with a terminal pin insertion hole 22 into which the terminal pin 7 of the coil bobbin 1 is inserted. Further, in the figure, numeral 23 indicates a gap paper to be inserted into the abutting portion of the ferrite core 9, and numeral 24 indicates an upper insulating case.

The assembling method and function of the high-voltage transformer having the above structure will be described below. First, the primary winding 5 and the secondary winding 6 are wound, and the coil bobbin 1 in which the intermediate tap of the secondary winding 6 is wired to the intermediate tap terminal 11 is incorporated in the lower insulating case 12 in advance. The diode 13 and the insulating holder 8 configured so that the dummy terminal 14 is inserted are combined.

Next, the core insulating wall 10 of the insulating holder 8
After the ferrite core 9 and the lower insulating case 12 in which the capacitor 15 is incorporated like the diode 13 are incorporated from below, the intermediate tap terminal 11, the dummy terminal 14, and the dummy terminal 14 are installed. By connecting the lead wire of the diode 13 by soldering, the voltage generated at the intermediate tap is rectified. Further, thereafter, the capacitor 15 incorporated in the lower insulating case 12, the primary winding 5 and the secondary winding 6
Insulating film 16 between coil bobbin 1 wound with
Both sides were insulated by inserting.

[0010]

However, in the above-mentioned conventional structure, the coil bobbin 1 around which the primary winding 5 and the secondary winding 6 are wound, and the coil bobbin 1 are mounted so as to cover approximately half the circumference thereof. When the lower insulating case 12 in which the diode 13 and the capacitor 15 are previously incorporated is incorporated into the combination of the semicircular cylindrical insulating holder 8 from below, the plurality of terminal pins 7 planted in the coil bobbin 1
Is a predetermined terminal pin insertion hole 22 provided in the lower insulating case 12, and the lead wire of the diode 13 incorporated in the lower insulating case 12 is an insertion hole 20 of the insulating holder 8.
It was necessary to assemble each by aiming at the insertion holes.

Further, the dummy terminal 14 is required to connect the intermediate tap terminal 11 of the secondary winding 6 and the diode 13, and accordingly, the coil bobbin 1 and the insulation holder 8 are assembled after the insulation holder 8 is incorporated in the coil bobbin 1. In this structure, the dummy terminal 14 must be inserted into the dummy terminal insertion holes 19 and 21 provided on both sides of No. 8 and the dummy terminal 14 and the lead wire of the diode 13 must be connected by soldering.

Further, the insulating film 16 must be used in order to insulate the coil bobbin 1 and the capacitor 15 which are arranged close to each other, which requires a large number of assembling steps, resulting in defective soldering and defective disconnection in the assembling work. There was a problem that it was easy to do.

The present invention solves the above-mentioned conventional problems. The number of parts can be reduced by effectively utilizing the parts used without impairing the reliability of the conventional high-voltage transformer, and the method of mounting the parts can be improved. An object of the present invention is to provide a high-voltage transformer of higher quality and lower cost by reducing the number of assembling steps by making changes and at the same time reducing defects caused by the assembling work.

[0014]

In order to achieve this object, a high-voltage transformer of the present invention has a collar at least at both ends, and a plurality of terminal pins are planted on the lower end collar, and a lead-out portion is provided on the terminal pin. With a coil bobbin wound around the connected primary winding and secondary winding, and a diode mounting portion for fitting and holding a diode in a part of a semi-cylindrical outer peripheral surface that covers approximately half the circumference of this coil bobbin, An insulating holder with a capacitor mounting part that holds the capacitor by inserting it into one end, and a core insulating wall between this diode mounting part and the capacitor mounting part, and a core insulating wall of this insulating holder that guides the capacitor into the coil bobbin. A ferrite core, a lower insulation case that is assembled from below in a combination of this coil bobbin and an insulation holder, and an assembly from above. Constituted by the upper insulation case, the leads of diodes mounted on the diode mounting portion disposed close to the center tap of the secondary winding of the coil bobbin, solder connects the lead wire and the intermediate tap portion with which,
An insulating protrusion that maintains insulation between the capacitor and the coil bobbin winding is provided near the capacitor mounting portion of the insulating holder.

[0015]

With this configuration, since the lead wire of the diode is used to directly connect to the intermediate tap terminal,
Dummy terminals like conventional high voltage transformers are no longer needed,
Since the number of points to be connected by soldering can be reduced, the reliability can be improved. Also, because the diode is mounted from the side, mounting of the diode is easy, and because the insulating protrusion is integrally provided on the insulating holder, it is not necessary to use a dedicated insulating film to insulate the capacitor, reducing the number of parts. Not only the number of assembling steps is reduced, but also the position of the insulating protrusion is always at a fixed position, so that the capacitor can be reliably insulated.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the essential structure of the high-voltage transformer of the present invention used in a flyback transformer for a small cathode ray tube. In FIG.
1 has a lower end flange 32, an upper end flange 33, and intermediate flanges 34a and 34b, and a plurality of terminal pins 35 are planted in the lower end flange 32. A primary winding 36 and a secondary winding 37 are wound around the coil bobbin 31, and the drawn-out portions of the windings are wired to the terminal pins 35 and connected by soldering.

The secondary winding 37 has a center tap,
The intermediate tap has an intermediate tap terminal 3 shorter than the length of the terminal pin 35 planted in the lower end collar 32 of the coil bobbin 31.
8 and is connected by soldering. On the upper part of the coil bobbin 31, a semi-cylindrical insulating holder 39 is incorporated so as to cover substantially half the circumference of the coil bobbin 31. The diode 4 is provided on the outer peripheral surface of the insulating holder 39.
Recessed diode mounting portion 41 for fitting and holding 0
And a mortar-shaped capacitor mounting portion 43 for fitting and holding the capacitor 42.

Further, the core insulating wall 4 is provided between the diode mounting portion 41 and the capacitor mounting portion 43 of the insulating holder 39.
4 is provided, and a primary winding 36 wound around the capacitor 42 and the coil bobbin 31 is provided near the capacitor mounting portion 43.
An insulating protrusion 45 is provided to maintain insulation between the secondary winding 37 and the secondary winding 37. The core insulating wall 44 of the insulating holder 39 is
The pair of U-shaped ferrite cores 46 is attached to the coil bobbin 31.
It is also configured to function as a guide when incorporated into. In addition, a gap paper 47 is inserted in the central facing portion of the ferrite core 46. A lower insulating case 48 is incorporated from below the coil bobbin 31, an upper insulating case 49 is incorporated from above, and a shield case 50 covers the outside of the upper insulating case 49.

Next, a detailed structure for mounting the diode 40 will be described. 2 drawn from diode 40
The lower lead wire 40a of this lead wire is linear and is drawn out to the outside of the lower surface of the lower insulating case 48 through a lead wire hole 48a provided in the lower insulating case 48. The upper lead wire 40b is formed into a U shape, and the tip portion 40c of the formed lead wire 40b is formed.
Is inserted in the U groove portion 51 arranged near the intermediate tap terminal 38 of the coil bobbin 31. Insulation holder 39
The upper and lower sides of the diode mounting portion 41 have grooves 41a and 41b for holding the lead wires of the diode 40, and the groove widths of the grooves 41a and 41b are slightly narrower than the lead wire diameter of the diode 40. ing.

A method of assembling the high voltage transformer configured as described above will be described. First, the primary winding 36 is wound between the lower end collar 32 and the intermediate collar 34a of the coil bobbin 31,
The lead-out portion of the winding is wired to the terminal pin 35. The secondary winding 37 has a drawn-out portion wired to the terminal pin 35, is wound over the primary winding 36, and then is wound between the intermediate flange 34a and the intermediate flange 34b and between the intermediate flange 34b and the upper flange 33. The high voltage diode 5 which is wound and wired to the intermediate tap terminal 38 at a predetermined winding position in the middle of winding and the winding end of the secondary winding 37 is inserted in the upper end flange 32 of the coil bobbin 31.
It is wired to the second lead wire 52a.

Next, the insulating holder 39 is assembled from the upper side of the coil bobbin 31, and the positioning convex portion 54 provided on the upper end flange 33 of the coil bobbin 31 is inserted into the positioning hole 53 provided in the insulating holder 39 to fix and fix the position. Is going. After incorporating the insulating holder 39, the diode 40 is attached to the concave diode mounting portion 41 provided on the side surface.
Is inserted, and the lead wire of the diode 40 is press-fitted into the grooves 41a and 41b to fix the diode 40.

When inserting the diode 40, the lead wire 4
The tip portion 40c of 0b is slightly bent to the side of the intermediate tap terminal 38 planted in the lower end collar 32 of the coil bobbin 31,
This bent portion is inserted into the U groove portion 51 of the coil bobbin 31, and the tip end portion 40c of the lead wire 40b and the intermediate tap terminal 38 are brought close to each other. By solder dipping in this state, the lead-out portion of the winding wired to the terminal pin 35 is solder-connected, and at the same time, the lead-out portion of the intermediate tap wired to the intermediate tap terminal 38 and the lead wire 40b of the diode 40 are connected. The tip portion 40c is integrally soldered. Similarly, in a separate step, the winding end portion of the secondary winding 37 is also solder-connected by solder dipping.

Next, the capacitor 42 is attached to the capacitor mounting portion 4
3 into the coil bobbin 31 and the ferrite core 46,
Incorporating the gap paper 47, the lower insulating case 4 from below
8 is inserted and the ferrite core 46 is fixed by adhesion or the like. Finally, the lead wires of the high voltage diode 52 and the capacitor 42 attached to the upper end flange 33 of the coil bobbin 31 and the high voltage lead wire 55 are solder-connected, and then the upper insulating case 49 and the shield case 50 are assembled to complete the assembly.

Therefore, the lead wire 4 of the diode 40 is
Since the connection with the intermediate tap terminal 38 is made directly by using 0b, the dummy terminal 11 such as the conventional high voltage transformer is not necessary, and the number of points for soldering connection can be reduced to improve reliability. You can Further, since the diode 40 is configured to be fitted from the side surface, the diode 4
Since it is easy to attach 0, and since the insulating protrusion 39 is integrally provided on the insulating holder 39, it is not necessary to use the dedicated insulating film 16 for insulating the capacitor 42, and only the number of parts and the number of assembling steps are reduced. In addition, since the position of the insulating protrusion 45 is always at a fixed position, the capacitor 42 can be reliably insulated.

In the embodiment, the case where the diode 40 is fitted and held on the side surface of the insulating holder 39 has been described, but an electronic component other than the diode may be inserted.

[0027]

As described above, the present invention has a collar at least at both ends thereof, and a plurality of terminal pins are planted in the collar at the lower end, and the primary winding and the secondary winding in which the lead portions are connected to the terminal pins. It has a coil bobbin wound around a coil and a semi-cylindrical shape that covers approximately half the circumference of this coil bobbin and has a diode mounting part that holds the diode by fitting it in a part of the outer peripheral surface, and also holds a capacitor by fitting it in one end. Insulating holder with a capacitor mounting part and a core insulating wall between the diode mounting part and the capacitor mounting part, a core guided by the core insulating wall of the insulating holder and incorporated into the coil bobbin, and an insulating part The combination of holders consists of an insulating case that is installed from below and an upper insulating case that is installed from above. Assembling steps can be reduced, and assembly easier, it is possible to provide a highly reliable high-voltage transformer at low cost.

Since the lead wire of the diode attached to the diode mounting portion is arranged close to the intermediate tap portion of the secondary winding of the coil bobbin, the intermediate tap terminal and the secondary tap portion of the secondary winding of the coil bobbin are soldered at the same time as soldering. The intermediate tap of the secondary winding and the solder connection of the diode can be made directly. 1
It is possible to complete the work with one solder dip.

Furthermore, since the insulating protrusions that maintain the insulation between the capacitor and the winding of the coil bobbin are provided in the vicinity of the capacitor mounting portion of the insulating holder, the insulation of the capacitor can be secured without using a dedicated insulating component. It is possible to realize an excellent high voltage transformer.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main configuration of a high voltage transformer according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main configuration of a conventional high voltage transformer.

[Explanation of symbols]

 31 coil bobbin 32 lower end flange 33 upper end flange 35 terminal pin 36 primary winding 37 secondary winding 38 intermediate tap terminal 39 insulating holder 41 diode mounting portion 42 capacitor 43 capacitor mounting portion 44 core insulating wall 45 insulating protrusion 48 lower insulating case

Claims (3)

[Claims] 1. A coil bobbin having a collar on at least both ends thereof, wherein a plurality of terminal pins are planted on the lower end of the collar, and a primary winding and a secondary winding are connected to the terminal pins and a drawing portion is wound. , A semi-cylindrical shape that covers approximately half the circumference of this coil bobbin, and has a diode mounting part that holds the diode by fitting it in a part of the outer peripheral surface, and also provides a capacitor mounting part that fits and holds the capacitor at one end, An insulating holder with a core insulating wall between the diode mounting part and the capacitor mounting part, a ferrite core guided by the core insulating wall of this insulating holder and incorporated into the coil bobbin, and a combination of this coil bobbin and insulating holder. A high-voltage transformer composed of a lower insulating case incorporated from above and an upper insulating case incorporated from above. 2. The high voltage transformer according to claim 1, wherein the lead wire of the diode attached to the diode attachment portion is disposed in the vicinity of the intermediate tap portion of the secondary winding of the coil bobbin, and the lead wire and the intermediate tap portion are soldered to each other. 3. The high voltage transformer according to claim 1, further comprising an insulating protrusion provided near the capacitor mounting portion of the insulating holder to maintain insulation between the capacitor and the coil bobbin winding.