JPH0135452Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a flyback transformer, and particularly to a flyback transformer having a structure in which a medium voltage winding is wound around a high voltage bobbin.

Background technology and its problems In recent years, flyback transformers have become extremely compact, but even small flyback transformers usually have focus (medium pressure), heater,
It is designed to output video voltage, etc.
FIG. 1 is a diagram showing an example of the wiring of such a flyback transformer. Generally, high voltage is 3-5kV and medium voltage is 300-600V. FIG. 2 is a partial sectional view showing a conventional structure of a flyback transformer connected as shown in FIG. In the figure, 1 is a core, 2 is a low-pressure bobbin, 3 is a high-pressure bobbin, and 4 is an output terminal pin installed on the low-pressure bobbin. For the sake of simplicity, only three output terminal pins 4 are shown. A wire with a thick diameter is used for the low voltage winding, a wire with a small diameter is used for the high voltage winding, and a thin wire can also be used for the medium voltage winding. Medium voltage windings vary depending on the structure of the flyback transformer, but windings up to about 300V are wound on the low voltage bobbin 2, and those above that up to about 600V are wound on the high voltage bobbin 3. When winding the medium voltage winding on the low voltage bobbin 2, the connection is relatively easy because the output terminal pin for taking out the medium voltage output is planted on the low voltage bobbin 2, but if the wire diameter is small, the wire may break. Easy to occur. To prevent this, thick lines must be used. On the other hand, when winding medium-voltage windings on the high-voltage bobbin 3, the same thin wire as the high-voltage windings can be used, which is convenient for winding work, but it is necessary to provide a medium-voltage lead-out terminal on the high-voltage bobbin 3. do not have. FIG. 2 shows an example of such a case, and in the figure, 5 is a medium voltage lead-out terminal. In this case, a jumper wire 6 is required to connect the medium voltage lead-out terminal 5 to the low voltage bobbin output terminal pin 4. Therefore, during manufacturing, the operator must perform manual operations that require skill, such as soldering the jumper wire 6 and removing the pins, and is troubled by defects due to soldering errors and wire breaks.

Purpose of the invention In view of the above-mentioned points, the present invention is designed to allow automatic winding of ultra-fine wires in recent years, while also allowing for automatic winding and reducing the manual process described above. The present invention aims to provide a flyback transformer that can improve reliability by reducing disconnection defects and the like.

Summary of the invention The present invention uses an L-shaped pin instead of a medium-voltage lead-out terminal, and installs it at an appropriate location on the high-voltage bobbin 3 to serve as a medium-voltage output terminal pin. Medium voltage output can be taken directly without going through pin 4.

Embodiment FIG. 3 is a partial cross-sectional view showing a preferred embodiment of the present invention. In the figure, parts corresponding to those in FIG. 2 are given the same or similar symbols. Reference numeral 5' denotes an L-shaped pin for medium voltage output terminal, which is planted in the high voltage bobbin 3 so that its long part is parallel to the output terminal pin 4 of the low voltage bobbin 2 and its short part protrudes from the high voltage bobbin 3. . The L-shaped pin 5' can be installed at an appropriate location on the high-pressure bobbin 3, but if the output terminal pin 4 is installed on a substantially circular arc along the circular cross section of the winding, the outside of the L-shaped pin 5' can be selected. If the L-shaped pin 5' is installed at the end (the space created when a circle is inscribed in a square), the space can be used effectively. The drawing terminal of the medium voltage winding is
It is connected to a portion of the L-shaped pin 5' that protrudes from the high voltage bobbin in a direction perpendicular to the output terminal pin. That is,
The L-shaped pin serves both as a medium voltage lead-out terminal and as an output terminal pin.

Effects of the invention According to the invention, the following remarkable practical effects can be obtained.

(b) Winding medium voltage windings on high voltage bobbins does not have the drawbacks of the conventional method, and automatic winding machines for ultra-fine wires can be used because the medium voltage windings can be made of the same thin wire as the high voltage windings. Take advantage of this advantage.

(b) When a medium voltage winding is wound on a high voltage bobbin, the jumper wire that was conventionally necessary is no longer necessary.

(c) Therefore, there is no need to worry about wire breakage or poor soldering due to the use of jumper wires, and the reliability of the product is improved. Additionally, manual work that requires skill, such as soldering jumper wires and removing pins, is reduced.

(d) Manufacturing is facilitated by reducing manual labor and using an automatic winding machine.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the connection of a flyback transformer, FIG. 2 is a partial sectional view showing a conventional example, and FIG. 3 is a partial sectional view showing a preferred embodiment of the present invention. 1...Core, 2...Low pressure bobbin, 3...High pressure bobbin, 4...Output terminal pin, 5'...L-shaped pin (medium voltage output terminal pin).

Claims (1)

[Scope of utility model registration request] In a flyback transformer, a low voltage bobbin and a high voltage bobbin are arranged coaxially around a core, an output terminal pin is planted on the low voltage bobbin, and a medium voltage winding is wound around the high voltage bobbin. A flyback transformer that uses an L-shaped pin as a medium-voltage output terminal pin by erecting it so that its long part is parallel to the output terminal pin and its short part projects from the high-voltage bobbin.