KR0169920B1 - Automatic control of focus & screen of fbt - Google Patents

Abstract

The present invention relates to an apparatus and method for automatically adjusting the focus and screen voltage of a flyback transformer (FBT).

The present invention allows the flyback transformer to automatically perform an operation such as measuring the focus voltage and the screen voltage, adjusting the voltage, and discharging the charged high voltage, thereby improving accuracy and productivity of the adjustment. It works.

Description

Focus and screen auto adjuster

1 is a block diagram showing the configuration of an apparatus for automatically adjusting focus and screen according to the present invention.

2 is a detailed circuit diagram of the CRT pile and discharge unit 70 shown in FIG.

3 is a flowchart showing a method for automatically adjusting focus and screen according to the present invention.

* Explanation of symbols for main parts of the drawings

1 control unit 2 input / output unit

3: PLC 4: motor

5: Transfer conveyor 11-13: 1st, 2nd, 3rd solenoid valve

21 to 23: first, second and third cylinders 30: power supply

41: data input / output section 42: multiplexer

43: A / D converter 51, 52: 1st, 2nd probe

60: motor control unit 70: CRT pile and discharge unit

The present invention relates to an apparatus and a method for automatically adjusting the focus and screen voltage of a flyback transformer (FBT), and more particularly, to measure the focus voltage and the screen voltage in the flyback transformer, and to adjust and charge the voltage. The present invention relates to a focus and screen automatic adjustment device and a method for automatically performing an operation process such as discharging a high voltage.

In general, during the manufacturing and manufacturing of the flyback transformer, the focus voltage and the screen voltage should be adjusted to the reference voltage or the standard voltage, and through such a process, a very high voltage charged to the flyback transformer should be discharged.

In the conventional art related to the general technology, a separate measuring device, for example, an oscilloscope, a tester, etc., is used to measure the focus voltage and the screen voltage of the flyback transformer, so as to correspond to the reference voltage. The flyback transformer is produced by manually adjusting the adjusted volume (variable resistor) and then manually discharging the charged anode voltage.

This conventional method has the following problems.

Firstly, the relevant voltage was measured manually, and there was a problem of complicated measurement work environment and complicated measurement work environment, and secondly, the voltage was manually adjusted. There was a problem that precision adjustment was impossible, and thirdly, there was a problem in that there was a risk that the measurer was exposed to a high voltage because it manually discharged a high voltage.

In addition, as described above, since the measurement, adjustment, and discharge operations are all performed manually during the production process, there is a problem such as a large amount of time resulting in a decrease in productivity.

The present invention has been made to solve the above problems.

Accordingly, an object of the present invention is to improve the accuracy and productivity of the adjustment by allowing the flyback transformer to automatically perform an operation such as measuring the focus voltage and the screen voltage, adjusting the voltage, and discharging the charged high voltage. The present invention provides a focus and screen automatic adjustment device and a method thereof.

As a technical means for achieving the above object, the apparatus of the present invention comprises a control unit for collectively controlling the various devices in accordance with a built-in program;

An input / output unit which supplies a power generation control signal from the control unit to a power supply unit and enables data communication between the control unit and the PLC; A PLC controlling a plurality of solenoid valves, CRT piles and discharge units, and a transfer conveyor driving motor according to control of the control unit through the input / output unit; A plurality of solenoid valves operable to respectively control operations of each of the plurality of cylinders under the control of the PLC;

A plurality of cylinders driven according to the operation of the solenoid valve to position the corresponding device to a predetermined position; A power supply unit for generating power under the control of the control unit through the input / output unit and supplying the power to the hajig;

A data input / output unit configured to provide a control signal of the controller to a multiplexer;

A multiplexer for selecting one of two signals from a probe by a control signal through the data input / output unit;

An A / D converter converting the analog signal selected by the multiplexer into a digital signal and providing the same to the controller;

Two probes for dropping the voltage taken by the test point from the flyback transformer;

A motor controller for controlling the motor according to the control of the controller;

CRT pile and discharge unit for performing a discharge function under the control of the PLC;

Characterized in having a.

In addition, as a technical means for achieving the above object, in the method of the present invention, the control unit drives the transfer conveyor motor through the PLC to control the printed circuit board (PCB) equipped with the flyback transformer (FBT) to the measurement position The first step to do;

A second step of controlling the operation of the first solenoid valve in the PLC so that the test pin is brought into contact with the lower surface of the printed circuit board by raising a plurality of test pins formed thereon;

A third step of controlling the operation of the second solenoid valve in the PLC so that the second cylinder descends by lowering the upper jig having the discharge plate mounted on the lower surface thereof so that the discharge plate contacts the anode cap of the upper portion of the flyback transformer; ;

A fourth step of supplying power from the power supply unit to the haegig under the control of the control unit through the input / output unit;

A fifth step of controlling the operation of the third solenoid valve in the PLC to advance the third cylinder so that the two test points for adjusting the measurement signal and the adjusting drive contact the signal output groove and the variable volume of the flyback transformer; ;

A sixth step in which the data multiplexer selects one signal under the control of the controller through the input / output unit and inputs the selected signal to the controller through an A / D converter;

A seventh step of comparing the input voltage with a reference voltage and controlling a variable motor of the flyback transformer according to the comparison result until the measured voltage and the reference voltage are the same;

An eighth step in which the data multiplexer selects one other signal according to the control of the controller through the input / output unit and inputs the selected signal to the controller through an A / D converter;

A ninth step of comparing the input voltage with a reference voltage, and controlling a variable motor of the flyback transformer according to the comparison result until the measured voltage and the reference voltage are the same;

After the ninth step, the power supply is stopped by the controller, the discharge cylinders of the CRT pile and the discharge unit are moved forward and backward by the PLC to discharge the anode voltage for a predetermined time, and then the entire operation ends. It is characterized by consisting of a tenth step.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a focus and screen automatic adjustment device and method according to the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an automatic focus and screen adjustment apparatus according to the present invention, and FIG. 2 is a detailed circuit diagram of a CRT pile and discharge unit 70 shown in FIG.

Referring to FIGS. 1 and 2, the apparatus according to the present invention includes a control unit 1 which collectively controls various devices according to a built-in program, and a power supply control unit 30 that generates a power generation control signal from the control unit 1. And a plurality of solenoids according to the control of the input / output unit 2 and the control unit 1 through the input / output unit 2 to enable data communication between the control unit 1 and the PLC 3. PLC 3 which controls valve 11-13, CRT pile and discharge part 70, and the conveying conveyor drive motor 4, and many cylinders 21-23 under control of the said PLC 3. A plurality of solenoid valves 11 to 13 that operate to control respective operations respectively, and a plurality of cylinders 21 to 23 that are driven in accordance with the operation of the solenoid valves 11 to 13 to position the device at a predetermined position. And, according to the control of the control unit 1 through the input / output unit 2 to generate a power supply to the hajig (JIGB) The probe (not shown) is provided by a power supply unit 30, a data input / output unit 41 for providing a control signal of the control unit 1 to the multiplexer 42, and a control signal through the data input / output unit 41. A multiplexer 42 for selecting one of two signals from 51 and 52, and an A / D converter 43 for converting an analog signal selected by the multiplexer 42 into a digital signal and providing the same to the controller 1; And two probes 51 and 52 for dropping the voltage drawn from the flyback transformer FBT by the test pointers TP1 and TP2, and the motors M1 and M2 under the control of the controller 1; Motor control unit 60 to control, and the CRT pile and discharge unit 70 performing a discharge function under the control of the PLC (3).

In addition, the conveying conveyor (5) is a device for bringing the printed circuit board (PCB) to the upper and lower jigs (JIGA, JIGB) for measurement and adjustment, and to be carried out after completion of the measurement and adjustment, the power supply The supply unit 30 is a device for supplying AC power (eg, 110 or 220V) required to the printed circuit board (PCB) through the jigs (JIGB).

On the other hand, during the measurement and adjustment of the printed circuit board, the printed circuit board (PCB) is brought into contact with the test pin (PIN) of the jigg (JIGB), and a flyback transformer (FBT) is placed on the printed circuit board (PCB). It is also mounted on the flyback transformer (FBT), the support portion (SB) to hold the focus voltage and the screen voltage wire to be connected to the test pointers (TP1, TP2), and also to support the anode cap (AC) ) Is installed.

Referring to FIG. 2, the CRT pile and discharge unit 70 is configured to apply a load R1 to an anode voltage between 20 kV and 33 kV for stabilization of a printed circuit board during measurement and adjustment. After this is completed, the fourth cylinder 83 is configured to move forward by the fourth solenoid valve 81 to discharge the high-voltage anode voltage through the load R2.

Operations and effects according to the present invention configured as described above will be described in detail below based on the accompanying drawings.

Referring to FIGS. 1, 2 and 3, first, when the controller 1 shown in FIG. 11 drives the motor 4 for the conveying conveyor through the PLC 3, the conveying conveyor 5 A flyback transformer (FBT) mounted on a printed circuit board (PCB) is positioned between the jigs (JIGB) and the top jigs (JIGA), which are the measurement positions (this is the first step 111 shown in FIG. 3). )).

When the printed circuit board (PCB) is moved to the measurement position, the plurality of test pins (PIN) by controlling the operation of the first solenoid valve 11 in the PLC (3) to drive up the first cylinder (21) ) Is formed, the jigg (JIGB) is raised to contact the test pin (PIN) to the lower surface of the printed circuit board (PCB) (this corresponds to the second step 112).

After the test pin (PIN) of the jigg (JIGB) is in contact with the printed circuit board (PCB), the operation of the second solenoid valve 12 in the PLC (3) to control the second cylinder (22). By lowering driving, the upper jig (JIGA) having the discharge plate DT mounted on the lower surface is lowered so that the discharge plate DT comes into contact with the anode cap AC above the flyback transformer FBT. (This corresponds to third step 113).

After the discharge plate DT is in contact with the anode cap (AC) as described above, in order to measure the focus voltage and the screen voltage output from the flyback transformer FBT on the printed circuit board PCB. Under the control of the control unit 1 through the output unit 2, the power supply unit 30 supplies AC power to the printed circuit board PCB through the jigs JIGB (this is in the fourth step 114). Applicable).

When power is supplied to the printed circuit board (PCB), the printed circuit board is operated to start the flyback transformer operation mounted thereon, by controlling the operation of the third solenoid valve 13 in the PLC (3) By advancing the third cylinder 23, the two test points TP1 and TP2 for measuring the measurement signal and the adjustment drives D1 and D2 are connected to the signal output grooves G1 and G2 of the flyback transformer FBT. And the variable volumes VR1 and VR2 (this corresponds to the fifth stage 115).

When the test pointers TP1 and TP2 are in contact with the signal output grooves G1 and G2, the focus voltage and the screen voltage from the flyback transformer FBT are respectively measured through the respective test points TP1 and TP2. Two probes 51 and 52 are provided, and the first and second probes 51 and 52 are provided to the multiplexer 42 by dropping the voltage to a magnitude that can be processed by the controller 1 including the microcomputer. do. At this time, under the control of the controller 1 through the input / output unit 41, the multiplexer 42 selects and outputs a focus voltage among the two voltages provided from the first and second probes 51 and 52, The analog voltage is converted into a digital signal by the A / D converter 43 and then input to the controller 1 (this corresponds to the sixth step 116).

The control unit 1 compares the input focus voltage with a preset reference voltage, and controls the corresponding adjustment motor M1 according to the comparison result until the measured voltage and the reference voltage are the same, and then the flyback transformer FBT. When the measured voltage is large, more specifically, the motor M1 is rotated forward to adjust the variable volume VR1, and then the comparison is made again. When the voltage is small, the process of adjusting the variable volume VR1 by repeatedly rotating the motor M1 is repeatedly performed. When the comparison result is the same, the next test item, the screen voltage measurement and adjustment process, is performed ( This corresponds to the seventh step (117 to 121).

The process of selecting the screen voltage and inputting it to the controller 1 is an operation process which is almost similar to the process of selecting and inputting the focus voltage to the controller, except that the selection control signal from the controller 1 is different. 42 selects the screen voltage.

The screen voltage in the selected analog form is converted into a digital signal by the A / D converter 43 and then input to the controller 1 (this corresponds to the eighth step 122).

The process of determining and controlling the input screen voltage is performed in the same process as described above. The input voltage is compared with the reference voltage, and according to the comparison result until the measured voltage and the reference voltage are the same. The adjustable motor M2 is controlled to adjust the variable volume VR2 of the flyback transformer FBT (hereinafter referred to as ninth steps 123 to 126).

After measuring and adjusting the voltage of the flyback transformer as described above, the power supply is stopped by the control signal by the control unit 1, and the discharge cylinder of the CRT pile and the discharge unit 70 is controlled by the PLC 3. 전 advances for a predetermined time, discharges the high anode voltage charged in the above process, and then moves backwards, after which the entire operation ends (this corresponds to the tenth step (127 to 130)).

As described above, the present invention allows the flyback transformer to perform the operation of measuring the focus voltage and the screen voltage, adjusting the voltage, and discharging the charged high voltage, thereby improving the precision and productivity of the adjustment. This can be effective.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.

Claims (2)

A control unit 1 for collectively controlling various devices in accordance with a built-in program; An input / output unit (2) for supplying a power generation control signal from the control unit (1) to a power supply unit (30) and enabling data communication between the control unit (1) and the PLC (3); PLC controlling a plurality of solenoid valves 11 to 13, CRT piles and discharge units 70, and a transfer conveyor driving motor 4 under the control of the control unit 1 through the input / output unit 2. (3); A plurality of solenoid valves 11 to 13 operative to control operations of each of the plurality of cylinders 21 to 23 respectively under the control of the PLC 3; A plurality of cylinders 21 to 23 which are driven in accordance with the operation of the solenoid valves 11 to 13 to position the corresponding device in a predetermined position; A power supply unit 30 generating power under the control of the control unit 1 through the input / output unit 2 and supplying the power to the jigging JIGB; A data input / output unit 41 for providing a control signal of the controller 1 to the multiplexer 42; A multiplexer (42) for selecting one of two signals from the probes (51, 52) by a control signal through the data input / output section (41); An A / D converter 43 for converting an analog signal selected by the multiplexer 42 into a digital signal and providing the same to the controller 1; Two forbs 51 and 52 for dropping the voltage taken by the test pointers TP1 and TP2 from the flyback transformer FB T; A motor controller 60 for controlling the motors M1 and M2 according to the control of the controller 1; And a CRT pile and a discharge unit (70) for performing a discharge function under the control of the PLC (3). A first step 111 of controlling the printed circuit board (PCB) equipped with the flyback transformer (FB T) to the measurement position by driving the transfer conveyor motor (4) through the PLC (3); The first solenoid valve 11 in the PLC 3 so that the test pin PIN contacts the lower surface of the printed circuit board PCB by raising the jigs JIGB having the plurality of test pins PIN formed thereon. A second step 112 of controlling the operation of the first cylinder 21 to drive up; In the PLC 3, the upper jig JIGA having the discharge plate DT mounted thereon is lowered so that the discharge plate DT contacts the anode cap AC of the upper portion of the flyback transformer FBT. A third step 113 of controlling the operation of the second solenoid valve 12 to cause the second cylinder 22 to be driven down; A fourth step 114 of supplying power from the power supply unit 30 to the jigs JIGB under the control of the control unit 1 through the input / output unit 2; Two test points (TP1, TP2) and adjusting drives (D1, D2) for taking in the measurement signal are in contact with the signal output grooves (G1, G2) and the variable volumes (VR1, VR2) of the flyback transformer (FBT). A fifth step (115) of controlling the operation of the third solenoid valve (13) in the PLC (3) to advance the third cylinder (23); According to the control of the control unit 1 through the input / output unit 41, the multi-teleplexer 42 selects one signal, and the selected signal is transferred to the control unit 1 through the A / D conversion unit 43. A sixth step 116 for input; The variable voltage VR1 of the flyback transformer FBT is adjusted by comparing the input voltage with the reference voltage and controlling the corresponding motor M1 according to the comparison result until the measured voltage and the reference voltage are the same. Seventh steps 117 to 121; The multiplexer 42 selects one other signal under the control of the controller 1 through the input / output unit 41, and the selected signal is input to the controller 1 through the A / D converter 43. An eighth step 122 to ensure; The variable voltage VR2 of the flyback transformer FBT is controlled by comparing the input voltage with the reference voltage and controlling the corresponding adjusting motor M2 until the measured voltage and the reference voltage are the same. Ninth steps (123 to 126) to be performed; After the ninth step, the power supply is stopped by the controller 1, and the discharge cylinders of the CRT pile and the discharge unit 70 are moved forward and backward by the PLC 3 to discharge the anode voltage for a predetermined time. Then, the focus and screen automatic adjustment method comprising the tenth step (127 ~ 130) for terminating the entire operation