JPH02215108A - Fly-back transformer device - Google Patents

Abstract

PURPOSE:To simplify the structure of the title device as a whole by a method wherein the wound-in type capacitor as a smooth capacitor is provided as the case with which the main body of a fly-back transformer device will be enclosed. CONSTITUTION:A cylindrical wound-in type capacitor 25 is provided on the circumference of the bobbin 12 and a magnetic core 16 of the main body 10 of a fly back transformer device in such a manner that the above-mentioned bobbin 12 and the core 16 are covered by the capacitor 25. When high voltage output is applied between both ends T1 and T2 of the capacitor 25, the withstand voltage of the capacitor 25 is allotted by a plurality of electrostatic capacitances CX, and sufficiently large withstand voltage can be provided. Said capacitor 25 is fitted to the annular projecting part 14 which is protruding downward on the circumference of a terminal board 14, and the lead wire 31, which is led out from the electrode foil 26b or 26C on the innermost side, is soldered to the other end of the rectifying diode element 2X connected to the secondary coil of the main body 10. The outermost foil 26B or 26C of the capacitor 25 is connected to the pin 32 which is planted on the terminal board 14, the capacitor 25 is connected between the cathode end of the element 2X and an earth. After assembling, epoxy resin is impregnated, and each component part is integrally fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a flyback transformer device, and can be applied to, for example, television receivers, electronic viewfinders for video cameras, and the like.

B. Summary of the Invention The present invention uses a rolled-up capacitor constituting a smoothing capacitor as a case in a flyback transformer device, thereby making it possible to obtain a flyback transformer device with a simpler overall configuration. .

C. Prior Art Conventionally, as shown in FIG. 8, this type of flyback transformer 1 receives a low voltage input of, for example, about 5 [■] which is input to the primary winding IA wound around the electric core IC. VIN is boosted to obtain a high voltage pulse P.uT of about 2500 (■) to the secondary coil IB, and this is rectified by a rectifier diode 2 and a smoothing capacitor 3 to obtain a high voltage DC output ■. This high-voltage DC output V.ut is used to drive the anode of the cathode ray tube, and in practice, the flyback transformer main body 10 having the circuit configuration shown in FIG. An assembled flyback transformer device 11 is used.

In FIG. 9, the flyback transformer main body lO is a flanged bobbin 1 arranged to extend in the vertical direction.
A plurality of, for example, 3N laminated coils 13 are wound on the bobbin 12, and each laminated coil portion of the laminated coils 13 is electrically connected using pins 15 planted on a terminal plate 14 provided on the upper part of the bobbin 12. It is made to be.

A low voltage input ■ is supplied to the laminated coil portion of the laminated coil 13 that constitutes the primary coil IA through the pin 15.
A magnetic core 16 (U-shaped magnetic core half 16
A and 16B), a high voltage pulse P is applied to the laminated coil part that constitutes the secondary coil IB. It is designed to induce u7.

The high-voltage side end of the laminated coil portion constituting the secondary coil IB of the laminated coil 13 is electrically led out through a pin 17 provided on the lower side of the bobbin 12, and one end of the rectifier diode 2X is soldered to this pin 17. At the same time, the other end of the smoothing capacitor element 3X, which has the ground side end connected to the pin 15, is soldered to the other end of the rectifier diode element 2X, and the soldered part is connected to the anode cap terminal 18. The core wire of the output cord 19 is soldered.

(Thus, the rectifying diode element 2X and the smoothing capacitor element 3X constituting the high-voltage side components are gathered at the outer peripheral position of the laminated coil 13 constituting the secondary coil IB, that is, at the lower peripheral position of the bobbin 12, and the high-voltage side A rectangular insulating case 20 and a metal shield case 21 are provided to cover the components.

In this embodiment, the output cord 19 is connected to the outlet ports 2OA and 2 provided in the insulating case 20 and the shield case 21.
It is led out through 1A.

The flyback transformer device 11 actually assembled in the state shown in FIG. 9 is impregnated with, for example, epoxy resin to insulate each component and at the same time fix them together.

According to the configuration shown in FIG. 9, the high-voltage side components of the flyback transformer main body 10 can be housed in the insulating case 20, and in addition to being able to sufficiently satisfy safety standards for practical use, magnetic The shield case 21 eliminates ringing noise that may be released to the outside based on the vibration phenomenon caused by the inductance corresponding to the leakage magnetic flux from the core 16 and the stray capacitance generated in the secondary circuit components of the flyback transformer main body 10. Can be shielded.

D Problems to be Solved by the Invention However, when using the flyback transformer device 11 having the structure as shown in FIG. Since the case 21 and the case 21 are separately provided as dedicated parts around the flyback transformer main body 10, it is still insufficient to simplify the overall structure.

The present invention has been made in consideration of the above points, and aims to propose a flyback transformer device whose overall configuration can be further simplified.

E Means for solving problem In a flyback transformer device 11 having a flyback transformer device main body 10 that rectifies a voltage pulse p out by a rectifier diode 2 and a smoothing capacitor 3 to obtain a high voltage DC output vout, a capacitor film 26 is wound into a cylindrical shape as a smoothing capacitor 3. A wound type capacitor 25 is used, and this wound type capacitor 25 is arranged as a case surrounding the flyback transformer main body 10.

By arranging the flyback transformer main body 10 inside the wound type capacitor 25 which is wound into a cylindrical shape, the wound type capacitor 25 functions as a smoothing capacitor 3 and has the functions of an insulating case 20 and a shield case. It can also function as 21.

As a result, the flyback transformer device 11 with a simple configuration can be obtained since it is not necessary to provide a dedicated case.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 2, in which parts corresponding to those in FIG. 9 are given the same reference numerals, a cylindrical winding is formed around the bobbin 12 and magnetic core 16 of the flyback transformer main body 10 so as to cover them. A built-in capacitor 25 is provided.

In the case of this embodiment, the wound type capacitor 25 is formed to have a rectangular cross section as shown in FIG.
It has a structure in which it is rolled into a cylindrical shape with the two in between.

As shown in FIG. 5, the capacitor film 26 is, for example, a plastic film 26 with a thickness of about 8 to 10 [μm].
It has a structure in which electrode foils 26B and 26C made of, for example, aluminum are attached to both sides of A by, for example, vapor deposition, and as shown in FIG. A capacitance is formed between the electrode foils 26B and 26C.

The electrode foils 26B and 26C have predetermined lengths Ll and LCI, respectively, and are sequentially arranged and attached in the longitudinal direction of the plastic film 26A at predetermined intervals, □ and Lct.

In addition, the electrode foils 26B and 26C are arranged so as to be staggered in the longitudinal direction of the plastic film 26A, and are opposed to each other so that their ends overlap with each other. The capacitance Cx formed in the intersecting portion 26D is the seventh
As shown in the figure, wound type capacitors 25 having an electrically equivalent circuit such as being connected in series are formed.

As a result, a high voltage output V is generated between both ends T1 and T2 of the wound capacitor 25. When uT is applied, the withstand voltage of the wound capacitor 25 is shared by a large number of capacitances CX, and as a result, the capacitor 25 as a whole has a sufficiently large withstand voltage for practical use.

The wound type capacitor 25 having such a configuration is fitted into an annular protrusion 14A formed around the terminal plate 14 (FIG. 1) so as to protrude downward, and is fitted into the innermost electrode foil 26B or 2.
A lead wire 31 led out from 6C is soldered to the other end of a rectifier diode element 2X whose one end is connected to the secondary coil IB of the flyback transformer main body 1O.

Further, the outermost electrode foil 26B or 26G of the wound type capacitor 25 is connected to the ground side pin 32 planted on the terminal plate 14, and thus the wound type capacitor 25 operates similarly to the smoothing capacitor element 3X in FIG. It is connected between the cathode end of the rectifier diode element 2X and the ground.

After the flyback transformer device 35 is assembled according to the structure shown in FIGS. 1 and 2, each component is insulated and fixed together by impregnation with epoxy resin.

In the above configuration, the flyback transformer device 35
When low-voltage input VIN is supplied to the laminated coil portion that constitutes the primary coil IA (FIG. 8) among the laminated coils 13,
A high voltage pulse pout induced in the secondary coil IB of the laminated coil 13 is supplied to the smoothing capacitor 3 consisting of the wound type capacitor 25 through the rectifier diode element 2x,
The output of the rectifier diode element 2X is rectified by the capacitance CX, and thus a high voltage is output to the anode cap terminal 18 through the output cord 19. . send out a.

Therefore, according to the configurations shown in FIGS. 1 and 2, the functions of the flyback transformer main body 10 described above with reference to FIG. 8 can be realized.
are the bobbin 12, the magnetic core 16, and the rectifier diode element 2.
By being formed so as to surround can be further simplified.

Incidentally, the wound type capacitor 25 is composed of the smoothing capacitor element 3x, the insulating case 20, and the shielding case 21 in the case of the conventional flyback transformer device 11 described above with reference to FIG.
By combining the functions of these members, it is possible to eliminate the need for separately providing these members, and thus the overall configuration can be further simplified.

In the above-mentioned embodiment, the case was described in which the wound type capacitor 25 was formed to have a rectangular cross section, but the shape of the wound type capacitor 25 is not limited to this, and may have various shapes, such as a cylindrical cross section. can be used.

Further, in the above-described embodiment, the lower surface side of the wound type capacitor 25 is left open, but instead of this, it may be closed by providing a separate bottom plate.

Furthermore, in the above-described embodiment, one capacitor film 26 is wound into a cylindrical shape as the rolled-up capacitor 25, but instead of this, the capacitor film 26 may be divided into a plurality of films as necessary, and each film may be tapped. The same effect as in the above case can be obtained even if it is rolled in while being released.

Further, in the above embodiment, the capacitor film 26
When winding up the capacitor films, an insulating film is sandwiched between the capacitor films, but instead of this, by forming an insulating layer in advance on the electrode foils 26B and/or 26C of the capacitor film 26, the sandwiching of the insulating films can be prevented. may be omitted.

H Effects of the Invention As described above, according to the present invention, a cylindrical wound-type capacitor is provided around the main body of a flyback transformer device, and the wound-shaped capacitor obtains the function of a smoothing capacitor while at the same time providing an insulating case and a shield. By obtaining the function as a case, it is not necessary to provide dedicated members for the insulation effect and the shielding effect, respectively, and the configuration as a combination of these parts can be simplified.

is a developed view of the capacitor film of a wound type capacitor, Figure 6 is a sectional view taken along the line VI-Vl in Figure 5, Figure 7 is a connection diagram showing the equivalent circuit of a wound type capacitor, and Figure 8 is a fly-in diagram. A connection diagram showing the electrical circuit configuration of a back transformer device, and FIG. 9 is a longitudinal sectional view showing the configuration of a conventional flyback transformer device.

1...Flyback transformer, 2...
Rectifier diode, 2X... Rectifier diode element, 3... Smoothing capacitor, 3X... Smoothing capacitor element, 12... Bobbin, 13...
...Laminated coil, 16...Magnetic core, 14
...Terminal board, 25...Wound type capacitor.

[Brief explanation of the drawing]

Claims (1)

[Claims] A high voltage DC output is obtained by boosting the low voltage input to the primary coil of a flyback transformer and rectifying the high voltage pulse obtained by the secondary coil using a rectifier diode and a smoothing capacitor. In a flyback transformer device having a flyback transformer device body to be obtained, a wound type capacitor formed by winding a capacitor film into a cylindrical shape is used as the smoothing capacitor, and the wound type capacitor is used as a case surrounding the flyback transformer device body. A flyback transformer device characterized by: