JP3319664B2 - Flyback transformer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer for supplying a high voltage to a picture tube (CRT). It is another object of the present invention to provide a flyback transformer device capable of reducing the size of a substrate to be mounted and increasing 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, this type of device includes a flyback transformer that boosts and rectifies the flyback pulse and supplies an anode voltage to the picture tube, a voltage is supplied from the flyback transformer, the voltage is divided and adjusted by a resistor, and the focus voltage is adjusted. And a high-voltage variable resistor (focus pack) for supplying a screen voltage to the picture tube. In recent years, for the purpose of size reduction and cost reduction, a so-called integrated type in which the flyback transformer and the high-voltage variable resistor are electrically and mechanically connected has been frequently used.

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

[0004]

As shown in FIG. 6, the substrate on which the flyback transformer device 1 is mounted includes:
Space for high voltage stabilization control circuit 2 is required,
The substrate area has increased accordingly. Also, since the circuit for adjusting the high voltage of the flyback transformer is on the substrate side, various adjustments (confirmation of high voltage stabilization performance, high voltage adjustment, each protector, etc.) are required unless the flyback transformer device 1 is mounted on the substrate. Circuit operation check, etc.) could not be performed, which hindered the efficiency of adjustment work and the improvement of productivity. (Assuming that a flyback transformer device is purchased from another company and a manufacturer of a TV receiver is considered, no adjustment has been made to the flyback transformer device 1 alone, so the flyback transformer device 1 is mounted. Adjustment work must be performed at the time of work, which leads to reduced productivity.)

SUMMARY OF THE INVENTION An object of the present invention is to provide a flyback transformer device capable of reducing the size of a board to be mounted and increasing the efficiency of adjustment work.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a transformer case having a built-in flyback transformer and a mechanical structure provided on the side of the transformer case.
And the voltage from the flyback transformer
Flyback with variable resistor for high voltage supplied
For a flyback transformer device equipped with a transformer body
In order to adjust the high pressure of the flyback transformer,
High voltage stabilization circuit, X-ray protector circuit, high voltage output
High voltage stabilization control circuit including drive pulse generation circuit
The built-in control circuit pack is
Fitting part for fitting the main body and the control circuit pack to each other
Accordingly, the present invention provides a flyback transformer device which is mechanically detachably provided on the low potential side of the flyback transformer main body .

[0007]

FIG. 1A is a perspective view of an embodiment of the present invention, FIG. 1B is a top view thereof, and FIG. 2 shows a state where a control circuit pack containing a high-voltage stabilization control circuit is removed. An example will be described.

The flyback transformer device 11 comprises a flyback transformer main body 21 and a control circuit pack 22 detachably provided on the low potential side of the transformer main body 21. The flyback transformer main body 21 includes a transformer case 31 having a built-in flyback transformer, and a high-voltage variable resistor 1b mechanically attached to a side surface of the transformer case 31 and supplied with a voltage from the flyback transformer. . The flyback transformer body 21
It is a so-called integrated type. 1c is a flyback transformer core, 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 a claw 21a (first fitting portion) provided on the low potential side of the flyback transformer main body 21 by a fitting portion 22a (second fitting portion) provided in the insulating case. Fit.

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, a circuit proposed in Japanese Patent Application No. 5-92041 is used.

As described above, in this embodiment, the control circuit pack 22 having the built-in high-voltage stabilization control circuit 12 is detachably provided on the flyback transformer main body 21. There is no need to provide the high-voltage stabilization control circuit 12, and the board area can be reduced.

Further, various adjustments (confirmation of high-voltage stabilization performance, high-voltage adjustment, operation of each protector circuit, etc.) without using the flyback transformer device 11 even without attaching to the substrate.
Can be performed, so that the efficiency of the adjustment work and the 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
2 simply removes the flyback transformer body 2
1 can be easily handled without changing the manufacturing process, and is easy to use.

Next, FIGS. 4 and 5 show a resistor pattern diagram and an equivalent circuit diagram in the high-voltage variable resistor 1b, respectively. The high-voltage variable resistor 1b has, in its insulating case, an insulating substrate on which a resistor pattern and electrodes are formed by printing. R1 to R7 are fixed resistance parts, RF1, RF2, R
S is a variable resistance unit. Variable resistance part RF1, RF2, R
On S, adjustment knobs F1, F2, S that are rotatably fixed to the insulating case 2 are provided. Sliders (not shown) attached to the respective ends of the adjustment knobs F1, F2, S are respectively provided with variable resistance portions RF1, RF2, R
By turning 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 where the ground terminal E is located (X1 direction), the flyback transformer body 21 naturally has the X1 direction side in FIG. It is on the low potential side. In this embodiment, the control circuit pack 22 including the high-voltage stabilization control circuit 12
Is provided on the low potential side of the flyback transformer main body 21. As a result, the present embodiment provides a high-voltage stabilization control circuit 12 based on insulation breakdown of the control circuit pack 22 due to high voltage, high-voltage noise, switching noise, and electrostatic noise.
Damage and malfunction can be prevented beforehand, high reliability can be obtained, and accurate high-pressure stabilization adjustment can be performed. 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 the size can be reduced.

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

[0018]

According to the flyback transformer device of the present invention,
As described above, the following effects are obtained. (B) Since the control circuit pack containing the high-voltage stabilization control circuit is detachably provided on the flyback transformer main body, there is no need to provide the high-voltage stabilization control circuit on the board on which the flyback transformer device is mounted, and the board area The size can be reduced.

(B) Various adjustments (confirmation of high-voltage stabilization performance, high-voltage adjustment, operation of each protector circuit, etc.) can be performed without using a flyback transformer device alone without mounting on a substrate, thereby improving adjustment efficiency and improving productivity. Can be achieved.

(C) If the high-voltage stabilization control circuit is not required for the purpose of cost reduction or the like, it can be easily coped with simply by removing the control circuit pack, and it is necessary to change the manufacturing process of the flyback transformer main body 21. There is no usability.

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

[Brief description of the drawings]

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

FIG. 2 is a diagram showing an embodiment in a state where a control circuit pack is removed.

FIG. 3 is a schematic circuit diagram of a mounting board according to one 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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-114518 (JP, A) JP-A-1-205406 (JP, A) JP-A-6-284306 (JP, A) 61971 (JP, U) Japanese Utility Model Showa 62-142817 (JP, U) Japanese Utility Model Showa 58-15322 (JP, U) Japanese Utility Model Utility Model Hei 3-112917 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) H01F 38/42 H04N 3/195

Claims (1)

(57) [Claims] 1. A transformer case having a built-in flyback transformer and mechanically attached to a side surface of the transformer case.
Voltage is supplied from the flyback transformer.
Flyback transformer having variable resistor for high voltage
In a flyback transformer device including a main body, a high pressure stabilization for adjusting a high pressure of the flyback transformer is performed.
Circuit, X-ray protector circuit, and high voltage output drive
Built-in high voltage stabilization control circuit including pulse generation circuit
The control circuit pack is connected to the flyback transformer body
The control circuit pack is fitted with
Wherein the flyback transformer is mechanically detachably provided on the low potential side of the flyback transformer main body .