KR200209820Y1 - Flyback transformer - Google Patents

Abstract

Regarding the flyback transformer, there is a difference between a slit in which the AFC winding is wound and a slit in which the primary winding is wound, and a portion in which the winding is not wound between the portion in which the AFC winding is wound and the slit in which the primary winding is wound. Make sure that the AFC voltage is not affected by the winding current and voltage.

Description

Flyback transformer

1 is a structural diagram of a flyback transformer according to the present invention.

2 is a structural diagram of a conventional flyback transformer.

* Explanation of symbols for main parts of the drawings

1 low pressure bobbin body 2 winding separation protrusion

3: terminal pin 4: terminal pin support

11: AFC winding

The present invention relates to a flyback transformer, in particular, a slit in which the AFC winding is wound and a slit in which the primary winding is wound, and a winding is wound between the slits between the portion in which the AFC winding is wound and the slit in which the primary winding is wound. It is a flyback transformer that puts this unwinded portion so that the AFC voltage is not affected by the current and voltage of the primary winding.

The brightness of fluorescent screens in TVs or monitors' tubes is almost proportional to the beam current and the anode voltage, so they need to be increased to get a bright picture. Increasing the beam current has a limit (up to 1mA) because the beam becomes thicker and the resolution decreases, thus increasing the anode voltage, which also has a limit (up to 25 KV), but the flyback transformer is used to increase the anode voltage. use.

2 shows the structure of a conventional flyback transformer.

The conventional flyback transformer consists of four slits 21, 22, 23 and 24, and the primary winding 21b for supplying the anode voltage to the AFC winding 21a and the brown tube in the first slit 21. This is wound.

In this way, the screen becomes brighter or darker depending on the current and voltage intensity flowing in the primary winding. As the AFC winding 21a and the primary winding 21b are wound in the same slit, the primary winding increases as the peak value of the primary winding increases. More of the magnetic flux generated in the winding is connected to the AFC winding 21a so that the pulse induced in the AFC winding changes its peak voltage and its frequency. Therefore, the peak voltage of the AFC signal and its frequency change in accordance with the current flowing through the primary winding and the voltage, and the horizontal synchronization is dispersed.

The present invention is to solve the above problems,

An object of the present invention is to provide a flyback transformer in which the primary winding and the AFC voltage winding are wound around different slits so that the AFC voltage is not affected by the current and voltage of the primary winding.

Another object of the present invention is to provide a flyback transformer in which the primary winding is wound around a plurality of slits to further separate the distance between the primary winding and the AFC winding so that the AFC voltage is not affected by the primary winding voltage. .

Apparatus according to the present invention to achieve the above object

A plurality of slits are formed in the low pressure bobbin, the AFC winding is wound around the first slit formed next to the pin terminal support, and the primary winding is wound around the remaining slit, and the low pressure bobbin is composed of seven slits. The primary winding is wound up to seven slits, and the number of turns from the second slit to the seventh slit is gradually wound from the second slit such that the number of turns of the seventh slit is twice the number of turns of the second.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

The structure of the flyback transformer according to the present invention is shown in FIG.

1 is the bobbin body part, which consists of seven slits (a-g), each of which is wound with a primary winding of a flyback transformer. 2 is the winding separation protrusion, which forms the boundary of the slit and separates each winding and determines the winding position. 3 is a terminal pin, to which the terminals of the windings wound on each slit are connected. 4 is a pin terminal support and supports a plurality of terminal pins (3). The AFC winding 11 is wound around the first slit a, the AFC winding 11 is not wound around the first slit a, but is wound around the pin terminal support 4 and the remaining portion of the first slit is wound. Space between the AFC windings and the second slit b to which the primary windings are wound. The primary winding is wound from the second slit b to the seventh slit g.

When the phase detection circuit compares the retrace period of the reference sawtooth signal with the phase of the horizontal synchronization signal, and when there is a phase difference, a corresponding correction voltage is generated, integrated in the integrating circuit, and applied to the horizontal oscillating circuit. The horizontal oscillation circuit outputs an oscillation signal whose frequency is controlled by the signal output from the integrating circuit of the phase detection circuit. The oscillation signal is input to the horizontal drive circuit and amplified and then input to the base of the horizontal output transistor. To turn the horizontal output transistor on and off. The primary winding of the flyback transformer is connected to the collector of the horizontal output transistor so that a pulse is generated depending on the horizontal output transistor turned on / off.

The pulse generated in this way causes a high voltage to be generated in the secondary high voltage winding and a pulse voltage to the AFC winding. However, since the AFC winding and the primary winding are wound in different slits, the pulse is output to the horizontal output transistor. This pulse has the same peak value and frequency as the pulse generated in, and only the lowest voltage becomes a pulse of the rising type.

In another embodiment, the smaller the number of turns wound on the second slit than the number of turns wound on the third slit, the closer to the AFC winding wound on the first slit, the smaller the number of turns and the peak value of the pulses induced in the AFC winding. And less influence on frequency. As the number of turns wound in the slit is increased, the number of turns in the seventh slit is doubled to the number of turns in the second slit, and the number of turns is 5: 6: 7: 8: 9: 10 so that the slit and the distant slit wound in the AFC winding are wound. The larger the number of turns, the less the magnetic flux generated by the primary winding affects the peak value and frequency of the pulses induced in the AFC winding.

As described above, according to the present invention, the brightness of the screen of the CRT can be accurately adjusted by winding the primary winding and the AFC voltage winding in different slits so that the AFC voltage is not affected by the current and voltage of the primary winding.

Claims (3)

In a flyback transformer for supplying an anode voltage to a CRT of a TV set or a monitor, and having a low pressure bobbin and a high pressure bobbin, the low pressure bobbin has a plurality of slits and is formed on the first slit formed next to the pin terminal support. Flyback transformer, characterized in that the winding of the primary winding to the remaining slit after winding. The flyback transformer according to claim 1, wherein the low pressure bobbin includes seven slits to wind the primary winding from the second slit to the seventh slit. According to claim 1 or 2, wherein the primary winding is characterized in that the number of turns from the second slit to the seventh slit winds more and more from the second slit such that the number of turns of the seventh slit is twice the number of the second turns Flyback transformer.