JPH08130139A - Fly-back transformer - Google Patents

Abstract

PURPOSE: To make a board small and adjustment work effective for a high- voltage feeding unit to a CRT. CONSTITUTION: A fly-back transformer unit 11 is made up of a main fly-back transformer body 21 and a control circuit pack 22 including a high-voltage stabilizing circuit. The control circuit pack 22 is put movably on the lower potential side of the main transformer body 21. In this case, the high-voltage stabilizing control circuit is not mounted on a mounting board but on the main transformer body 21, so the mounting board is made small and the high-voltage regulation work becomes effective.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer device for supplying a high voltage to a picture tube (CRT). It is another object of the present invention to provide a flyback transformer device that can reduce the size of a board to be mounted and improve the efficiency of adjustment work.

[0002]

2. Description of the Related Art A picture tube (CRT) used in a TV receiver or a display terminal device requires an anode voltage, a focus voltage and a screen voltage for its operation. Therefore, in this type of device, a flyback transformer that boosts and rectifies the flyback pulse and supplies an anode voltage to the picture tube, and a voltage is supplied from the flyback transformer. And a high voltage variable resistor (focus pack) for supplying a screen voltage to the picture tube. In recent years, a so-called integrated type in which the flyback transformer and the high-voltage variable resistor are electrically and mechanically connected has been widely used for the purpose of downsizing and cost reduction.

FIG. 6 is a schematic circuit diagram of a substrate to which the integrated flyback transformer device is attached. The flyback transformer device 1 is a flyback transformer 1
a and the high-voltage variable resistor 1b are integrally formed. On the substrate to which the flyback transformer device 1 is attached, a high voltage stabilizing circuit (regulator) 2a for adjusting the high voltage of the flyback transformer, a protector circuit 2b such as an X-RAY protector, a high voltage output (HVout) drive pulse generating circuit 2c. A high voltage stabilization control circuit 2 such as the above is provided.

[0004]

As shown in FIG. 6, the board to which the flyback transformer device 1 is attached is
Space is needed for the high voltage stabilization control circuit 2,
The substrate area was increased accordingly. Further, since the circuit for adjusting the high voltage of the flyback transformer is on the board side, various adjustments (confirmation of high voltage stabilization performance, high voltage adjustment, each protector) must be made unless the flyback transformer device 1 is attached to the board. It was not possible to check the circuit operation, etc.), which hindered the efficiency of adjustment work and improved productivity. (Consider a manufacturer who purchases a flyback transformer device from another company and manufactures a TV receiver. Since the flyback transformer device 1 itself has not been adjusted, the flyback transformer device 1 is attached. Adjustment work must be done at the time of work, which leads to a decrease in productivity.)

It is an object of the present invention to provide a flyback transformer device which can reduce the size of a substrate to be mounted and improve the efficiency of adjustment work.

[0006]

In order to solve the above problems, the present invention is directed to a high voltage variable resistor to which a voltage is supplied from the flyback transformer on the side surface of a transformer case having a flyback transformer built therein. Is provided on the low potential side of the flyback transformer main body mechanically attached to the flyback transformer, the first high-voltage stabilization control circuit for the flyback transformer is built in, and the first fit portion is fitted. A flyback transformer device, characterized in that a control circuit pack having a matching second fitting portion is mechanically attached to and detached from the flyback transformer body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 (a) is a perspective view of an embodiment of the present invention, FIG. 1 (b) is a top view thereof, and FIG. 2 is a state in which a control circuit pack containing a high-voltage stabilization control circuit is removed. An example will be shown.

The flyback transformer device 11 comprises a flyback transformer body 21 and a control circuit pack 22 detachably provided on the low potential side of the transformer body 21. The flyback transformer body 21 includes a transformer case 31 having a flyback transformer built therein, and a high-voltage variable resistor 1b mechanically attached to the side surface of the transformer case 31 and supplied with voltage from the flyback transformer. . The flyback transformer body 21 is
It is a so-called integrated type. Reference numeral 1c is a core of a flyback transformer, F1 and F2 are focus adjustment knobs, and S is a screen adjustment knob. The control circuit pack 22 has a built-in high voltage stabilization control circuit having an IC in its insulating case.

As shown in FIG. 2, the control circuit pack 22
Is detachably attached to the claw 21a (first fitting portion) provided on the low potential side of the flyback transformer main body 21 by the fitting portion 22a (second fitting portion) provided on the insulating case. Mating.

FIG. 3 shows a schematic circuit diagram of the inside of the flyback transformer device 11 and a schematic circuit diagram of a substrate on which the flyback transformer device 11 is mounted. The flyback transformer 1a, the high voltage variable resistor 1b, and the high voltage stabilization control circuit 12 in the control circuit pack 22 are electrically connected. The high voltage stabilization control circuit 12 includes a high voltage stabilization circuit (regulator) 2a for adjusting the high voltage of the flyback transformer, and a protector circuit 2 such as an X-RAY protector.
b, a high voltage output (HVout) drive pulse generating circuit 2c and the like. High voltage stabilization circuit (regulator) 2
For a, for example, the circuit proposed in Japanese Patent Application No. 5-92041 is used.

As described above, in this embodiment, the control circuit pack 22 containing the high-voltage stabilization control circuit 12 is detachably provided on the flyback transformer body 21, so that the flyback transformer device 11 is mounted on the substrate. Since it is not necessary to provide the high voltage stabilization control circuit 12, the substrate area can be reduced.

Further, various adjustments can be made by the flyback transformer device 11 alone without being mounted on the substrate (confirmation of high-voltage stabilization performance, high-voltage adjustment, operation check of each protector circuit, etc.).
As a result, adjustment work can be made more efficient and productivity can be improved.

Further, even when the high voltage stabilization control circuit 12 is not required for the purpose of cost reduction or the like, the control circuit pack 2
You only have to remove 2, the flyback transformer body 2
It can be easily handled without changing the manufacturing process of No. 1 and is easy to use.

Next, a resistor pattern diagram and an equivalent circuit diagram in the high voltage variable resistor 1b are shown in FIGS. 4 and 5, respectively. The high-voltage variable resistor 1b has an insulating case in which an insulating substrate on which a resistor pattern and electrodes are formed by printing is formed. R1 to R7 are fixed resistors, RF1, RF2, R
S is a variable resistance part. Variable resistance part RF1, RF2, R
On the S, adjustment knobs F1, F2, S rotatably fixed to the insulating case 2 are provided. Sliders (not shown) attached to the respective tips of the adjustment knobs F1, F2, S are variable resistance parts RF1, RF2, R, respectively.
It is in contact with S, and by rotating the adjustment knob, the slider slides on the variable resistance portion to change the voltage.

H is a high voltage input terminal from the flyback transformer, and E is a ground terminal. X described in FIG.
1, X2, Y1 and Y2 correspond to X1, X2, Y1 and Y2 described for indicating the direction in FIG.

Since the high-voltage variable resistor 1b has a low potential portion on the side having the ground terminal E (X1 direction), the flyback transformer body 21 naturally has the X1 direction side shown in FIG. 1 (a). It is on the low potential side. In this embodiment, a control circuit pack 22 incorporating the high voltage stabilization control circuit 12
Are provided on the low potential side of the flyback transformer body 21. As a result, in the present embodiment, the high voltage stabilizing control circuit 12 due to the high voltage causes insulation breakdown of the control circuit pack 22, high voltage noise, switching noise, and electrostatic noise.
It is possible to prevent damages and malfunctions of the device, to obtain high reliability, and to perform accurate high-pressure stabilization adjustment. Further, since the control circuit pack 22 is provided on the low potential side of the flyback transformer main body 21, the high voltage stabilization control circuit 12 is provided closer to the flyback transformer main body 21, so that miniaturization can be achieved.

Since the high voltage detecting portion A requires a highly accurate dividing resistor, the trimming resistor R7 shown in FIG.
Was used. (As another method, a variable resistor may be provided outside the flyback transformer body 21 to adjust the voltage division ratio.)

[0018]

The flyback transformer device of the present invention is
As described above, it has the following effects. (B) Since the control circuit pack containing the high-voltage stabilization control circuit is detachably installed in the flyback transformer body, it is not necessary to provide the high-voltage stabilization control circuit on the board on which the flyback transformer device is mounted, and the board area can be reduced. Can be miniaturized.

(B) Since various adjustments (confirmation of high-voltage stabilization performance, high-voltage adjustment, operation confirmation of each protector circuit, etc.) can be performed by the flyback transformer device alone without mounting on the substrate, adjustment efficiency is improved and productivity is improved. Can be achieved.

(C) When the high-voltage stabilization control circuit is not required for the purpose of cost reduction, it can be dealt with simply by removing the control circuit pack, and it is necessary to change the manufacturing process of the flyback transformer main body 21. No, it is easy to use.

(D) Since the control circuit pack is provided on the low potential side of the flyback transformer body, high reliability is obtained,
Accurate high-voltage stabilization adjustment is possible, and the high-voltage stabilization control circuit is provided closer to the main body of the flyback transformer, so that the size can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view and a top view of an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment with a control circuit pack removed.

FIG. 3 is a schematic circuit diagram of a mounting substrate according to an embodiment.

FIG. 4 is a resistor pattern diagram in the high-voltage variable resistor 1b.

FIG. 5 is an equivalent circuit diagram in the high voltage variable resistor 1b.

FIG. 6 is a diagram for explaining a conventional example.

[Explanation of symbols]

 1a Flyback transformer 1b Variable resistor for high voltage 2a High voltage stabilization circuit (regulator) 2a 2b Protector circuit 2c High voltage output (HVout) Drive pulse generation circuit 11 Flyback transformer device 12 High voltage stabilization control circuit 21 Flyback transformer body 21a Claw (first fitting part) 22 Control circuit pack 22a Fitting part (second fitting part) 31 Transformer case

Claims (1)

[Claims] 1. A low-potential side of a flyback transformer body in which a variable resistor for high voltage to which a voltage is supplied from the flyback transformer is mechanically attached to a side surface of a transformer case containing a flyback transformer. A flywheel transformer having a first fitting portion, a high-voltage stabilization control circuit for the flyback transformer, and a second fitting portion that fits with the first fitting portion. A flyback transformer device characterized by being mechanically attached to and detached from the back transformer body.