JP2958972B2 - Transformer for high pressure generation - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for generating a high voltage applied to an anode of a cathode ray tube.

2. Description of the Related Art First, a flyback transformer will be described as an example of a conventional high-voltage generating transformer device. FIG. 14 is a diagram showing a circuit configuration of a flyback transformer of a type called a hot type. In FIG. 14, 1 is a magnetic core, 2 is a low voltage winding, and 3 is a high voltage winding. Reference numeral 4 in the low-voltage winding 2 denotes a primary winding through which the sawtooth current supplied from the horizontal deflection circuit flows.

By the way, the flyback transformer is configured not only to generate a high voltage for a cathode ray tube but also to generate voltages of various magnitudes to be supplied to each part of the device (in this case, a television receiver). ing. Low voltage winding 2
5 is a winding for generating various voltages to be supplied to each part of the device, and these windings are hereinafter referred to as tertiary windings 5.

On the other hand, the high voltage winding 3 is divided into a plurality of layers on a bobbin for high voltage,
It is wound in a stacked state. That is, 3a is a first layer winding in the high voltage winding, and 3b is a second layer winding in the high voltage winding. Similarly, reference numerals 3c, 3d, 3e, and 3f denote third-layer, fourth-layer, fifth-layer, and sixth-layer windings, respectively. Reference numeral 6 denotes a rectifying diode connected between the layers of the high-voltage winding 3. The diodes 6 are connected in series in the same direction, that is, in the direction in which the current IK flows, between the layers of the high-voltage winding. Reference numeral 8 denotes a resistor for absorbing ringing noise, and reference numeral 9 denotes a protection resistor on the anode side. The winding start end of the first-layer winding 3a is connected to the ABL circuit via the resistor 8. Reference numeral 10 denotes a so-called focus unit constituted by a plurality of voltage dividing resistors.

FIG. 15 shows the structure of this flyback transformer. In FIG. 15, reference numeral 12 denotes a bobbin for a low-voltage winding, which is provided with a plurality of slots by forming a plurality of collars 20, and a primary winding 4 is provided in some slots, and a bobbin 3 is provided in other slots. The secondary windings 5 are wound respectively. Further, a plurality of terminal pin holding members 13 are protruded from the lower end of the bobbin 12, and a terminal pin 14 is provided for each of them.

Reference numeral 15 denotes a high-voltage winding bobbin, and reference numeral 16 denotes an insulating layer provided between the layers of the high-voltage winding 3 wound on the bobbin 15. The insulating layer 6 is formed by winding a dielectric film on top of one another. It should be noted that a rectangular magnetic core is actually mounted so as to penetrate the bobbin 12 for low-voltage winding, but is omitted here. The bobbin 15 is mounted so as to cover the bobbin 12. However, the terminal pin holding portion 13 and the terminal pin 14 protrude from the bobbin 15.

FIG. 16 is a perspective view showing a bobbin 12 for low-voltage winding.
In FIG. 16, reference numerals 21, 22, and 23 denote ends of low-voltage windings, that is, lead wires. For example, 21 is a lead wire of a winding wound in the uppermost slot. The tip of the lead wire 21 is connected to the terminal pin 14 at the lowermost part, but the middle part is in a state of being bridged over other windings,
Thereby, the distance between the lead wire 21 and the other windings is maintained. Similarly, the other lead wires, that is, the lead wires 22 and 23, are also bridged over the other windings.
20 keeps the distance from the other windings.

Problems to be Solved by the Invention Incidentally, the potential of the secondary winding with respect to the ground is very high, and a very high voltage is applied to the high-voltage bobbin. Therefore, it is not preferable that the high-voltage winding bobbin and the primary winding come into contact with each other as well as approach each other.

However, in the above conventional example, if it is attempted to lower the flange 20 of the bobbin 12 for the low-voltage winding in order to separate the lead wire of the low-voltage winding from the bobbin 15 of the high-voltage winding, The space distance between the coil and the other windings in the low-voltage winding is shortened, and the insulation of that portion is reduced. Although winding is performed automatically by a machine, winding is not always performed in an orderly manner.For example, variations in the wire bundle shape of a low-voltage winding in a rolled-up state cannot be ignored. Must be designed with a large space distance between them. This also becomes a major obstacle when trying to design small ones.

The present invention has been made in view of this problem, and an object of the present invention is to provide a high-voltage generating transformer device that ensures insulation between a high-voltage bobbin and a primary winding even if it is miniaturized. I do.

Means for Solving the Problems In order to solve the above problems, the present invention mounts a plurality of conductive foils each having an end connected to a terminal pin on the low voltage bobbin in the longitudinal direction of the low voltage bobbin. A low-voltage bobbin is wound around an insulating film having a window so that a part of the insulating film is exposed, and a low-voltage winding is wound on the insulating film and the end is connected to the conductive foil exposed through the window. did.

Operation With the configuration described above, the conductive foil mounted in advance conducts between the end of each winding in the low-voltage winding and the terminal pin, and the winding at a location far from the terminal pin. Need not be pulled to the terminal pins.

Embodiment Hereinafter, an embodiment of a high-voltage generating transformer device according to an embodiment of the present invention will be described. FIG. 1 is a perspective view showing the low-pressure bobbin 30 of the high-pressure generating transformer device. In FIG. 1, reference numeral 31 denotes a strip-shaped conductive foil provided on the low-pressure bobbin 30. The strip-shaped conductive foil 31 is removed by etching an unnecessary portion of the copper foil uniformly coated on the side surface of the low-pressure bobbin 30. It is formed by such means. Strip conductive foil 31
Are attached at substantially equal intervals along the longitudinal direction of the low-pressure bobbin 30. And terminal pins at the lower end respectively
Connected to 32.

FIG. 2 is an enlarged perspective view showing a terminal pin holding portion formed on the bobbin 30. As shown in FIG. 2, the rear end of the terminal pin 32 projects outside from the rear end surface of the terminal pin holding portion. ing. The strip-shaped conductive foil 31 is disposed on the rear end face of the terminal pin holding section, and the strip-shaped conductive foil 31 is connected to the rear end of the terminal pin 32 by welding.

In FIG. 3, reference numeral 33 denotes an insulating film wound around the low-pressure bobbin 30. A window 34 is formed in the insulating film 33 so that a part of the strip-shaped conductive foil 31 is exposed.

FIG. 8 shows the low-voltage bobbin 30 in a state where only the winding of the tertiary winding in the low-voltage winding is completed. In FIG. 8, each low-voltage winding is wound on the insulating film 33. And, for example, both ends of the lowermost winding 35 are windows
It is connected to the strip-shaped conductive foil 31 exposed by.

The high-pressure bobbin has the same configuration as that of the conventional example shown in FIG.

Hereinafter, the process of winding the low-voltage winding will be described step by step.

First, as shown in FIG.
Wrap around 30. At this time, the predetermined band-shaped conductive foil 31 is wound without being displaced so as to be exposed from the predetermined window. FIG. 4 shows a state in which the insulating film 33 is wound up.

On the first layer of the low-voltage winding, a tertiary winding 5 for generating various voltages to be supplied to each part of the device is wound. Fig. 5,
6 and 7 show how the tertiary winding is wound. First, in FIG. 5, the end of the line 36 is connected to one of the strip-shaped conductive foils 31, that is, the strip-shaped conductive foil 31a. Then, it is wound a predetermined number of times, and the state shown in FIG. 6 is obtained. In FIG. 6, a portion between point A and point B is one of a plurality of low voltage windings. However, in this state, the wire 36 and the strip-shaped conductive foil 31b are not connected, and the wire 36 is wound somewhat extra as shown in FIG. 7 for the purpose of temporarily fixing the wire 36. Then, in the state shown in FIG.
b are connected, for example, by welding. Reference numeral 37 denotes a connection point between the line 36 and the strip-shaped conductive foil 31b. After the connection between the wire 36 and the strip-shaped conductive foil 32b is completed, an operation for forming an adjacent winding is continued. FIG. 8 shows a state in which the tertiary winding is completed. At the uppermost part, the winding end of the wire 36 is connected to another belt-shaped conductive foil by welding or the like.

Next, an insulating film is wound again on the state shown in FIG. 8, and a primary winding is wound thereon. Fig. 9 shows 1
It is shown in a state where the next winding is completed. In FIG.
The winding start end of the primary winding 39 is connected to the strip-shaped conductive foil 31c,
The winding end of the primary winding 39 is connected to the strip-shaped conductive foil 31d. FIG. 12 is a sectional view of the completed state.

By the way, when the specification is changed, the primary winding 4 may not fit in one layer in some cases. In such a case, winding is performed as shown in FIG. That is, after winding one layer, the insulating film 33 is further wound, the wire is folded at the point C, and the wire is continuously wound on the newly wound insulating film 33. FIG. 13 is a sectional view of a completed state in this case.

In the above-described previous embodiment, the strip-shaped conductive foil and the terminal pins are separate bodies, and the two are electrically connected on the low-voltage bobbin 30. It is conceivable to configure them integrally. I.e. the eleventh
In the figure, a slit 41 is formed at the tip of the terminal pin holding portion 40. On the other hand, the terminal pin 42 and the strip-shaped conductive foil 43 are integrally formed by flattening a part of the rod-shaped member and bending it into a predetermined shape with a key height. Then, the terminal pin 42 is fixed by being sandwiched between the cracks 41.

Effect of the Invention As described above, the present invention mounts a plurality of strip-shaped conductive foils each having an end connected to a terminal pin on the low-voltage bobbin in the longitudinal direction of the low-voltage bobbin so that a part of the conductive foil is exposed. Wrap an insulating film with a window around the low-pressure bobbin,
By winding the low-voltage winding on the insulating film and connecting its end to the strip-shaped conductive foil exposed by the window, the conductive foil mounted in advance is connected to the end of each winding in the low-voltage winding. And between the terminal pin and the terminal pin, so that the end of the winding far from the terminal pin does not need to be pulled to the terminal pin in such a manner as to be bridged over another low-voltage winding. Therefore, it is possible to narrow the gap between the low-voltage bobbin and the high-voltage bobbin without lowering the insulation, and an insulating film is provided between the strip-shaped conductive foil serving as a lead wire for the low-voltage winding and another low-voltage winding. Since the insulation is interposed therebetween, the distance between them can be extremely reduced. Therefore, it is possible to explain the device in a very small size while securing the insulating properties at various places.

[Brief description of the drawings]

FIG. 1 is a perspective view of a low-voltage bobbin of a high-voltage generating transformer device according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing a terminal pin holding portion and a terminal pin of the low-voltage bobbin, and FIG. FIG. 4 is a perspective view showing a state in which the insulating film of the low-pressure bobbin is wound, and FIGS. 5, 6, and 7 are perspective views showing a state in which the low-pressure bobbin is being wound. FIG. 8, FIG. 8 is a perspective view showing a state where only the tertiary winding of the low-voltage bobbin is wound, FIG. 9 is a perspective view showing a state where the primary winding of the low-pressure bobbin is wound, and FIG. FIG. 11 is a perspective view of a state in which a primary winding of a bobbin is wound over two layers, FIG. 11 is a perspective view of a main part showing an embodiment in which a strip-shaped conductive foil and terminal pins are integrally formed, and FIG. FIG. 13 is a cross-sectional view of a transformer device for generating high voltage in an embodiment in which only one primary winding is provided. Sectional view of a high voltage generating transformer device in the embodiment in the case of winding the next winding over the two layers,
FIG. 14 is a circuit diagram of an example of a conventional high-voltage generating transformer device, FIG. 15 is a cross-sectional view of the high-voltage generating transformer device, and FIG.
The figure is a perspective view of the low-pressure bobbin 30 of the high-pressure generating transformer device. 30 ... Low-pressure bobbin, 31 ... Strip-shaped conductive foil 32 ... Terminal pin, 33 ... Insulating film 34 ... Window

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01F 17/00 H01F 27/32 H01F 38/12 H01F 38/42

Claims (1)

(57) [Claims] A cylindrical low-pressure bobbin for winding a low-voltage winding; and a cylindrical high-pressure bobbin for winding a high-voltage winding and covering the low-pressure bobbin so that an end of the low-pressure bobbin protrudes. A terminal pin is provided in a portion of the low-pressure bobbin that protrudes from the high-pressure bobbin, and a plurality of conductive foils each having an end connected to the terminal pin are mounted on the low-pressure bobbin along the longitudinal direction of the low-pressure bobbin. An insulating film having a window formed so that a part of the conductive foil is exposed is wound around the low-voltage bobbin, a low-voltage winding is wound on the insulating film, and the low-voltage winding is exposed through the window. A high-voltage generating transformer device connected to the conductive foil and an insulating sheet wound around the outermost periphery of the low-voltage winding.