SU1672584A1 - Magnetic scan generator - Google Patents

Abstract

The invention relates to radio engineering and can be used in computer input and output devices and television. The purpose of the invention is to increase speed. The magnetic sweep generator contains a preamplifier 1, two output amplifiers 2, 3, a deflecting coil 4, a resistor 5, two switches 6, 7 volt additives, two amplitude selectors 8, 10, an adder 9, a feedback circuit 11, a current sensor resistor 12 . Due to the input circuit consisting of selectors 8, 10 and adder 9, the output of switch 6 or 7 is connected to the non-inverting input of amplifier 1 so that the current in resistor 12 is greater than the current set in resistor 12 by the input voltage of the inverting signal the input of the amplifier 1, the amount of current in the resistor 5. 1 Il.

Description

The invention relates to radio engineering, in particular, to information display devices, and can be used in input-output devices of computers and television,

The purpose of the invention is to increase speed.

The drawing shows a structural electrical circuit of a magnetic sweep generator.

The magnetic sweep generator contains preamplifier 1, first 2 and second 3 output amplifiers, deflecting coil 4, resistor 5, first 6 and second 7 volt additive keys, first amplitude selector 8, adder 9, second amplitude selector 10, feedback circuit 11 and a current sensor resistor 12.

The generator works as follows.

When applying to the inverting input of the preamplifier 1 voltage pulse of negative or positive polarity, the voltage on the current sensor resistor 12 cannot change instantaneously, since the output amplifiers 2 and 3 are loaded on the deflection coil 4, therefore the input amplifier 2 or 3 is included in The saturation mode and the deflecting coil 4 is applied to the power supply voltage of the output amplifier 2 or 3, which, in response to the control input of the switch 6 or 7 volt-add, closes the switch. In this case, the voltage on the deflecting coil 4 becomes equal to the supply voltage of the switch 6 or 7 volts additive, exceeding the supply voltage of the output amplifier 2 or 3 by 4-8 times. From the output of the key 6 or 7 volts, the supply voltage of the key of the voltage addition is fed to the input of the amplitude selector 8 or 10, the voltage to

yo

WITH

Vj

45 SL 00 1

the output of which is equal to the voltage difference at its input and the voltage threshold of transmission. Moreover, if the voltage at the input of the amplitude selector 8 or 10 is less than or equal to the transmission threshold voltage, then the voltage at its output is zero. The voltage threshold of the transmittance of the amplitude selector 8 or 10 is selected by a large supply voltage of the output amplifier 2 or 3. From the output of the amplitude selector 8 or 10, the voltage goes to the first or second input of the adder 9, and from its output to the non-inverting input of the preamplifier one,

At this time, the current rise process occurs in the deflection coil 4, the end time of which is determined by the supply voltage of the key 6 or 7 volts and the inductance of the deflection coil 4. In the process of the current rise in the deflection coil 4 the sum of the currents flowing in the deflection coil 4 and in the resistor 5, is determined by the resistance of the current sensor resistor 12, the voltage of the input signal pulse at the inverting input of the preamplifier 1, the voltage on the inverting input of the preamplifier 1 and the gear ratio and the voltage of the magnetic sweep generator defined by the negative feedback circuit 11.

Due to the input circuit consisting of the first 8 and second 10 amplitude selectors and the adder 9, the output of switch 6 or 7 volts is connected to the non-inverting input of preamplifier 1 so that the current in the current sensor resistor 12 is greater than the current specified in the sensor resistor 12 the voltage of the input signal at the inverting input of the preamplifier 1, the current in the resistor 5, which is equal to

| -TKO)

where Eud is the voltage supply of the key of the volt additive 6 or 7;

Ksh - the resistance of the shunt resistor 5.

At the time of termination of the current buildup process in the deflecting coil 4, characterized by the transition of the output amplifier 2 or 3 from the saturation mode to the active mode and opening the switch 6 or 7 of the additional voltage, which is accompanied by a decrease in the current in the shunt resistor 5 to a very small value and decrease to

the voltage at the non-inverting input of preamplifier 1, the steady-state current in the deflection coil 4 is equal to

E K

Rat

where E is the voltage pulse of the input signal;

K - transmission coefficient for the voltage of the magnetic sweep generator;

Rdt - the resistance of the current sensor resistor 12.

Therefore, the time required to establish the current in the deflection coil 4 to the value of 0 t in the proposed generator is equal to ok L

t

: wd

(2)

where ok is the steady-state value of the current in the deflection coil 4;

20L is the inductance of the deflecting coil 4;

Eud - power supply voltage, a key of a volt-additive 6 or 7.

25

Claims (1)

Invention Formula A magnetic sweep generator containing a preamplifier, the output of which is connected to the first inputs of the first and second output amplifiers, to the second inputs of which are connected the outputs of the first and second keys of the additional voltage, the control inputs of which are connected to the outputs of the first and second output amplifiers, the first output of the deflection coil and the first output of the resistor, the second output of which is connected to the second output of the deflection coil, the first output of the current sensor resistor and through a negative feedback circuit with an inverting preamplifier input, with the second output of the current sensor resistor connected to a common bus, which is associated with the fact that, in order to improve speed, an adder is entered into it, the first and second amplitude selectors, the outputs of which are connected respectively to the first and second inputs of the adder, the output of which is connected to the non-inverting input of the preamplifier, while the outputs of the first and second keys of the additional voltage are connected to the inputs of the first and second, respectively torogo amplitude selectors.