JPS5821147Y2 - horizontal drive transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horizontal drive transformer in a television receiver, and particularly to a horizontal drive transformer in which the value of leakage inductance can be arbitrarily changed.

In a circuit that drives a horizontal output switching transistor, it is known that inserting a coil between the pace emitters of this transistor shortens the hall time of the transistor.

However, according to this method, it is necessary to newly connect the coil, which is not preferable.

The object of the present invention is to provide a horizontal drive transformer suitable for shortening the hole time by using the leakage inductance of the horizontal drive transformer that generates the base voltage of the horizontal output switching transistor. In a horizontal drive transformer in which a primary winding and a secondary winding are wound around a common bobbin, the primary winding and the secondary winding are divided in the axial direction of the bobbin and wound. At the same time, a part of the primary winding is wound over at least a part of the outer periphery of the secondary winding, so that the secondary winding and the horizontal output transistor are equivalently connected in series. The present invention relates to a horizontal drive transformer characterized in that the value of the leakage inductance inserted is adjusted.

Therefore, according to the present invention, it is possible to provide a horizontal drive transformer in which the value of leakage inductance can be changed within a predetermined range.

An embodiment of a horizontal drive transformer in a television receiver to which the present invention is applied will be described below with reference to the drawings.

As shown in FIG. 1, the core 2 of this horizontal drive transformer 1 is composed of an E-shaped iron piece 3 and an I-shaped iron piece 4.

A bobbin 5 is inserted into the central protruding piece of the E-shaped iron piece 3.

A pair of flanges 6 are provided on both sides of the bobbin 5, and a secondary winding and a secondary winding are wound around the outer periphery of a rectangular cylindrical portion 7 in the center between the flanges 6. There is.

Especially regarding the method of winding the primary winding and the secondary winding,
To explain with reference to the figure, an insulating plate 8 made of an insulating material such as a resin is attached to the outer circumference of the rectangular cylindrical part 7 of the bobbin 5. The primary winding 9 is wound on the left side.
The next winding 10 is wound.

That is, the primary winding 9 and the secondary winding 10 are wound separately in the axial direction of the bobbin 5.

The winding diameter of the primary winding 9 in the radial direction of the bobbin 5 is configured to be larger than that of the secondary winding 10, and the primary winding 9 is arranged to cover the outer circumference of the secondary winding 10. It extends to the left.

That is, the primary winding 9 is wound around the outer periphery of the secondary winding 10 in an overlapping manner.

Note that an insulating paper 11 is interposed between the outer peripheral portion of the secondary winding 10 and the primary winding 9.

The primary winding 9 and the secondary winding 10 are divided and wound in the axial direction of the bobbin 5, and are part of the primary winding 9 and are overlapped on the outer periphery of the secondary winding 10. By providing the overlap portion 12, this transformer 1 generates a leakage inductance whose value can be changed.

That is, as shown in FIG. 2B, the secondary winding 10 is first wound around the outer peripheral surface of the bobbin 5, and then the primary winding 9 is concentrically wound so as to cover the outer peripheral surface of the secondary winding 10. If the wire is wound, the degree of coupling will be very high, and leakage inductance will hardly occur.

On the other hand, as shown in FIG. 2C, a primary winding 9 and a secondary winding 10 are divided and wound in the axial direction of the bobbin 5 with an insulating plate 8 in between. In such a transformer, the degree of coupling is low (loose coupling) and the leakage inductance is large.

A transformer 1 according to an embodiment of the present invention shown in FIG. 2A has a second
It exhibits properties intermediate between the transformer shown in Figure B and the transformer shown in Figure 2C, and produces an appropriate value of leakage inductance.

Note that by changing the height and height of the secondary winding 10, respectively indicated by W and H in FIG. 2A, it is possible to change the value of the leakage inductance, for example, within the range of .mu.H to 25 .mu.H.

In other words, if the inside of the capsule W is made smaller and the height H is made larger,
The leakage inductance becomes large, and conversely, if the inside of the bag W is made large and the height H is made small, the leakage inductance becomes small.

Note that the number of turns of the primary winding 9 and the secondary winding 10 cannot be changed freely due to circuit constraints, and the cross-sectional area of the secondary winding 10, that is, the inside of the bag W and the height H, cannot be changed freely. The product must be approximately constant.

Furthermore, as is clear from the drawings, in general, in the horizontal drive transformer 1, the number of turns of the primary winding 9 is much larger than the number of turns of the secondary winding 10, so that the outer peripheral surface of the secondary winding 10 is covered. By adopting a configuration in which the primary winding 9 is wound in this way, leakage inductance can be adjusted over a wide range.

Next, a horizontal output circuit using this transformer 1 will be explained with reference to FIG. 3. The primary winding 9 of this transformer 1 is connected to the collector of a horizontal drive transistor 13.

Note that a damping circuit formed of a capacitor 14 and a resistor 15 is connected in parallel to the primary winding 9 .

The secondary winding 10 is also connected to the base of the horizontal output transistor 16.

This transistor 16 is connected to the flyback transformer and the coil of the deflection yoke, and allows current to flow intermittently through these transformers and the coil.

Further, the coil 17 connected in series with the secondary winding 10 equivalently represents the leakage inductance of the transformer 1.

Since the leakage inductance shortens the hole time of the horizontal output transistor 16, power loss can be reduced, and it is also possible to reduce the size of the heat sink or use inexpensive transistors.

As described above, the present invention provides a horizontal drive transformer in which the number of turns of the primary winding is much larger than the number of turns of the secondary winding. Since the primary winding is divided into parts and wound in different directions, and a part of the primary winding is overlapped with at least part of the secondary winding, an appropriate value of leakage inductance can be generated. In addition, it becomes possible to change the value of this leakage inductance within a wide range as appropriate.

Furthermore, even if leakage inductance occurs, this design does not cause the transformer to become large, and the structure is suitable for mass production.

[Brief explanation of the drawing]

The drawings show an embodiment of a horizontal drive transformer in a television receiver to which the present invention is applied. Fig. 1 is an exploded perspective view of this transformer, Fig. 2A is a sectional view thereof, and Fig. 2B is a leakage diagram. Figure 2C is a cross-sectional view similar to Figure 2A when the inductance is minimized, Figure 2C is a cross-sectional view similar to Figure 2A when the leakage inductance is maximized, and Figure 3 is a horizontal output circuit using this transformer. It is a circuit diagram. In addition, in the symbols used in the drawings, 5...bobbin, 9...primary winding, 10...secondary winding, 12...overlap Part 16...
- Horizontal output transistor, 17... is a coil.

Claims (1)

[Scope of utility model registration request] In a horizontal drive transformer in which a primary winding and a secondary winding are wound around a common bobbin, the primary winding and the secondary winding are divided and wound in the axial direction of the bobbin, and , a part of the primary winding is wound over at least a part of the outer periphery of the secondary winding, and is inserted equivalently in series between the secondary winding and the horizontal output transformer. A horizontal drive transformer characterized by adjusted leakage inductance value.