SU1030837A1 - Device for deflection of crt beam - Google Patents

Abstract

1. DEVICE FOR THE DEVELOPMENT OF THE BEAM OF THE ELECTRON-BEAM TUBE on the autor. 636646, characterized in that, in order to increase speed, enter a predigest block into it, the output of which is connected to the input of the output stage through a matching element, such as a resistor, and the input of the predistortion module is connected to the input of the output stage and the device input.

Description

YG4L.

2. The device according to claim 1, characterized in that the predistortion block contains an exponent driver, a first adder, a null organ, a time generator, an amplitude driver, a module allocation unit, an inverter / two switches, a second adder / first output of the exponential exponent connected to an inverter amplifier the input of the first adder, and the second output is connected to the non-inverting input of the first adder, the output of which is connected to the inverting input of the null organ, to the non-inverting input of which is a constant voltage level The output of the null organ is connected to the input of a Formi. The duration gate, the output of which

connected to the input of the amplitude generator, the control input of which is connected to the output of the module’s allocation unit, the output of the amplitude generator is connected to the input of the first and second switches, the control input of the first switch is connected to the output of the inverter, you; {one of the first switch is connected to the inverter with the input of the second fan and the output of the second switch is connected to the non-inverting input of the second adder, the output of which is the output of the predistortion block, the input of the predistortion block is connected to the input of the driver sponenty, input isolation block modulation, with the inverter input and a control input of the second switch

The invention relates to radio engineering, in particular, to alphanumeric indicator devices on cathode ray tubes with magnetic deflection of the beam, and can be used in input-output devices of electronic computer technology.

According to the main auth. No. 636646, a device is known for deflecting a beam of a cathode ray tube comprising a series-connected output stage and a deflection unit containing a deflecting coil in parallel with which a shunt is connected and additionally threshold shunts connected in parallel with a deflecting coil and consisting of chains of series-connected resistors and diodes and zener diodes included counter to each other

A disadvantage of the known device is that at high switching currents in the output stage the shape of the current pulse is distorted. The distortion is the result of a current surge, after which the current value is constant, which corresponds to the established process. The ejection of current is a result of self-induction in a deflecting coil when a voltage drop is applied to it, and its duration depends on the inductance and capacity of the coil, the capacity of the output stage, the mounting capacity, i.e. constant for this device. The amplitude of this current pulse is directly proportional to the input voltage, and its delay relative to the input voltage corresponds to the dependence of the increase

current in the coil on time. As is known, this current dependence for an inductor, which is a deflection coil, is exponential. Therefore, the delay of this pulse exponentially depends on the amplitude of the input pulses, the presence of an exponential delay limits the speed of the device.

The amount of information processed in radar stations is constantly increasing. This is associated with an increase in the intensity of movement, as well as with the presentation of more information about the state of each object separately. The increase in the amount of information processed about an object per unit of time created the need to develop a new device for deflecting a ray of a cathode ray tube, providing for the display of more information at the same time.

The purpose of the invention is to increase the speed of the device for deflecting the beam of the cathode-ray I tube.

This goal is achieved in that the device for deflecting a beam of a cathode ray tube contains a predistortion unit whose output is connected to the inverting input of the output stage through a matching element, such as a resistor, and the input of the predistortion unit is connected to the input of the output stage and the input of the device.

In addition, the predistortion block contains an exponentiation shaper, | first adder, null organ, duration shaper, amplicide shaper, module allocation unit, inverter, two switches, second adder, first exponential shaper output connected to the inverting input of the first: yN iaTopa, and the second output is connected to the non-inverting input of the first adder, the output of which is connected to the inverting input of the null organ, to the inverter non-inverting input whose voltage is applied to a constant level, the output of the null organ is connected to the input the output driver is the output of which is connected to the input of the amplitude generator, the control input of which is connected to the output of the allocation module, the output of the amplitude generator is connected to the input of the first and second switches, the control input of the first switch is connected to the inverter output, the output of the first switch is connected to the inverting input of the second the adder, and the output of the second decoder is connected to the non-inverting input of the second adder, the output of which is the output of the predistortion block the input of the predisk eny connected to the input of exponent block extracting unit output from the inverter input and to a control house WMOs second switch. The drawing shows the functional scheme of the device. A device for deflecting a beam of a cathode-ray tube contains a series-connected output stage 1. And a deflection unit 2, soils for deflecting coil 3, in parallel with which. A shunt 4 and threshold shunts 5 are connected, a predisc block 6, containing 7 formative exponents, the first adder 8, null organ 9, shaper 10 duration, shaper amplitude unit 11 module allocation 12, switches 13 and 14, inverter 15, second adder 16. The output of predistortion unit 6 is connected to the inverting input of the output stage 1 through block 17 co. Head, for example, a resistor, and the output of the predistortion block 6 is simultaneously connected to the output of the output stage and the input of the device. The first output of the exponential generator 7 is connected to the inverting input of the first sum of the torus 8, and to the second the output is connected to the non-inverting input of the first sum of the torus 8, the output of which is connected to the inverting input of the zero-organ 9, to the non-inverting input of which voltage is given level, the output of the zero-organ 9 is connected to the input of the shaper 10, the output of which is connected to the output of the amplitude shaper 11, the control input of which is connected to the output of the module 1 allocation module, the output of the shaper 11 of the amplitude is connected simultaneously At the input of the first 13 and second 14 switches, the control circuit of the first switch 13 is connected to the output of the inverter 15, the output of the first switch 13 is connected to the inverting input of the second adder 16, and the output of the second switch 14 is connected to a non-rotating input of the second sum-. torus 16, the output of which is the output of the predistortion block 6. The input of the predistortion unit 6 is simultaneously connected to the input of the exponent imaging unit 7, the input of the module allocation unit 12, to the input of the inverter 15, with the control input of the second switch 14. The device operates as follows. Input pulses enter the input of the output stage 1, amplify and output from the output to a deviation unit 2 containing deflecting coil 3, shunt 4 and threshold shunts 5, providing a critical oscillation damping mode at which a current surge is present in the deflecting coil. The predistortion unit 6 forms, from input pulses, pulses of constant duration with amplitude and delay proportional to the current surge on the deflecting coil and having an exponential dependence. The pulses generated by the predistortion unit 6, through the matching unit 17, for example, a resistor, are fed to the inverting input of the output stage 1 and are compensated for in the deflection coil 2. As a result of the absence of a current surge in the deflecting coil 2, the time from the beginning of the transition to the start of recording information on screen, i.e. before the start of the established process, decreases by 20-25%. BLOCK 6 predistortion works as follows. The input pulses are fed to the exponent driver 7, which consists, for example, of a capacitor, on one plate of which the input pulses are fed, and the second plate is connected simultaneously to the plus of the first diode and the minus of the second. The minus of the first diode through the resistance is connected to ground and is at the same time the output of the positive exponent, plus the second diode is connected through the resistance to the ground and is the output of the negative exponent. Depending on the polarity of the input signals at the output of the imaging unit 7, the exponent appears to be a positive or negative exponent. A positive exponential signal from the minus of the first diode is fed to a non-inverted input of the first cyivMaTopa 8, made, for example, on an operational amplifier, whose inverted input is given a signal of negative exponential dependence. At the output of the first sukmator, regardless of the polarity of the input signal, a signal of positive exponential dependence, which is fed to a null organ 9, collected, for example, at an operating (/ open-loop amplifier / feedback circuit, to the second input of which is connected) arises. constant voltage source. In the initial state, there is no voltage at the first input of the zero-organ 9, and the second input is always supplied with a constant level, as a result the operational amplifier is in a state saturated to the positive voltage level. At the time of the appearance of the signal of the back exponential dependence, the null organ 9 instantaneously transitions to the opposite state — the saturation until negative power. At the time when the voltage level of the back exponential dependence is equal to the level of the constant voltage the null organ 9 goes into saturation before positive power. The duration of finding the null organ 9 in negative bias until saturation is equal to the delay of the ejection in the deflecting cathode 3. With the null organ output 9 the signal is fed to the driver 9 duration, which forms a pulse of a certain duration on the falling edge. Shaper The duration consists, for example, of a capacitor, a resistor and a diode. The input signal is applied to one capacitor plate, and the second plate is connected simultaneously to the positive terminal of the diode and through a resistor to ground. The negative output of the diode is the output of the driver 10 duration. There are two pulses on the positive terminal - negative, corresponding to the leading edge of the signal removed from the null organ 9, and positive, corresponding to the falling edge of the signal removed from the null body 9. The diode transmits only a positive pulse, which has a well-defined duration depending on the parameters of the capacitor and a resistor included in the shaper 10; The time of occurrence of this pulse and its delay relative to the input pulse is equal to the time of its occurrence and the delay of the surge on the deflecting coil which can be compensated for. From the output of the shaper 10, the signal is fed to an amplitude forkshravatel 11, built, for example, on a field-effect transistor, to the drain of which pulses are fed from the shaper 10, and to the gate-control pulses from the module 12 of the selection module. The amplitude of the signal taken from the source of the field-effect transistor varies in time with the amplitude of the control pulses. Module allocation module 12 is made on a differential amplifier with diode switches at the input. The generated signal from the output of the amplitude generator 11 is supplied parallel to the inputs of the first 13. and second 14 switches, for example, built on field-effect transistors. On the control input: the switches receive input pulses - and if the input pulse is positive, it goes directly to the second switch 14, if the input pulse is negative, it goes to the first switch 13 through the inverter 15, made, for example, on a single-factor operation HHOM amplifier gain, the Second 16, to the inputs of which signals are received from the outputs of the CC of the muters 13 and 14, is an analog mixer on the OR and can be performed, for example, on an operational amplifier with non-operational adjustment the gain factor. At the output of the adder, a signal is finally obtained that is corrected for the duration and shape opposite to the surge current in the deflecting coil 3 to compensate for the surge current. The compensation signal from the sukmator 16 is fed to the non-inverting input of the output stage 1 through the matching block 17. The use of the invention allows to increase the total useful amount of information {unit per time due to the compensation of distortions in the form of exponential overshoot during the time from the beginning of the transition process to the beginning of writing the information. This follows from the fact that, as is well known / in deflecting systems, at the moment of switching on, a surge of self-induction current appears, which in high-speed devices with a beam output time of 15 MCS is 8-10 μs. It is also known that the writing of a sign of medium complexity in such indicators takes 5-10 ISS. Perform a calculation of the efficiency factor deviation and K: a) for a known device

b) for the proposed device

5 + 10 ъ 2

   - 22.5

2

Efficiency factor

VV. | H

- efficiency coefficient reject known device /

- deviation efficiency coefficient using the proposed device;

- coefficient of increase in deviation efficiency;

- average ejection time,

, is the average sign time;

 (: Q is the maximum beam output time.

The application of the invention will allow to increase the coefficient of effectiveness of the deviation, and, consequently, the field.

The smooth rise of the current pulse allows for additional stability of the device, which is an additional positive effect.

In addition, simultaneously with an increase in the speed of the device 5, an increase in the quality of the display of signs is achieved at small amplitudes of the output signals due to the compensation of distortions and as a result of the linearization of the characteristic. ,

Claims (2)

1. DEVICE FOR DECLINING THE BEAM OF AN ELECTRON BEAM TUBE according to ed. »636646, characterized in that, in order to increase performance, a prediction block is inserted into it, the output of which is connected to the inverting input of the output stage, through a matching element, such as a resistor, and the input of the predistortion block is connected to the input of the output stage and the input of the device. 2. The device according to π. 1, characterized in that the unit is pre-. The distortion contains the exponential shaper, the first adder, zero-organ, the duration shaper, the amplitude shaper, the module selection unit, the inverter / two switches, the second adder, the first exponent shaper output is connected to the inverting input of the first adder, and the second output is connected to the non-inverting input of the first the sum-, of the torus, the output of which is connected to the inverting input of the zero-organ, to the non-inverting input of which the constant voltage is applied, the output of the zero-organ is connected to the input of the driver output, whose output is connected to the input of the amplitude shaper, the control input of which is connected to the output of the module selection unit, the output of the amplitude shaper is connected to the input of the First and second switches, the control input of the first switch is connected to the output of the inverter, the output of the first switch is connected to the inverting input of the second the adder, and the output of the second switch is connected to the non-inverting input of the second adder, the output of which is the output of the predistortion unit, the input of the predistortion unit is connected to the generator shaper, the input of the module selection block, with the inverter input and with the control input of the second switch.