SU799113A1 - Staircase current generator - Google Patents

Description

The invention relates to a pulse technique. A step-form current generator is known, in particular for deflecting a CRT beam, containing a code-current converter connected via a bridge block of keys to a deflecting coil, a reversible counter, a reverse reverse trigger and a reverse current trigger in coil 1. A disadvantage of the known generator There is a lack of accuracy in the formation of current steps. The purpose of the invention is to improve the accuracy of the formation of current steps. The goal is achieved due to the fact that two (n + 1) input logic circuits are inserted into the current generator containing the reversible counter, the code-current converter, the bridge switching unit, controlled keys, the deflection of the coil and the trigger reversals of the counter and the reverse current. NON-OR and an inverter, where the inputs of the logic circuits are NOT-OR connected to the corresponding outputs of the reversible counter and the output of the inverter whose input is fed to an input signal, the output of one of the logic circuits of the NOT-OR connection to one of the inputs of the t-reverse counter of the counter, and the output in Ora cxeNbJ logical NOR is connected to the second input of the counter and reversing the trigger input of the flip-flop reverse current in deflection coil. The drawing shows the block diagram of the described generator. . The generator contains a converter 1 code-current, reversible counter. 2, inverter 3, (n + 1.) - input logic circuits 4 and 5 NOR, trigger counter 6 trigger, bridge switching unit, consisting of keys 7-10, in the diagonal of which the deflection coil 11 is turned on, trigger 12 reverse current in the coil, power supply 13, input 14 and output 15 of the inverter, inputs 16, 17 and outputs 18, 19 of the trigger 6, inputs 20-23 of the circuit 4 NOT-OR, and its output 24 inputs 25-28 and output 29 of the circuit 5 NOT-OR, inputs 30-32 and outputs 33-35 of counter 2, inputs 36-38 and output 39 of the code-current converter, input 40 and outputs 4142 of the trigger 12. The generator operates as follows. Before entering the inputs 14 and 30 of the clock pulse, the counter reversal trigger is in the zero position, i.e. a logical unit (high voltage level) is present at the output 19. It is necessary to ensure the operation of the reversible counter in the Compound mode. Counter 2 is zero, i.e. at its single outputs 33 and 34 there is a logical zero (low voltage level), and at zero outputs 35 there is a logical one. A logical zero at the inputs of the code-current converter provides its closed (off) state. A logical unit at zero output 41 of trigger 1-2 provides an open (enabled) state of keys 8 and 9, i.e. ensures the possibility of current passage in the coil 11. A logical zero at the output 42 ensures the closed state of the keys 7 and 10.

When entering the inputs 14 and 30 clock pulses at the outputs 33 and 34 of the reversible counter successively to the left - logical units appear (addition mode), the code generated thus acts on the inputs of the code-current converter, which turns on the coil current 11 along the circuit; one pole of the power supply, switch 8, coil, switch 9, code-current converter output. The magnetic field of the coil steps the beam, for example, from the center to the right edge of the CRT screen (not shown).

After the 4th clock pulse, logical units are formed at the outputs.

33 and 34 of counter 2, at all inputs of transducer 1 and inputs 20-22 of circuit 4. The current in the coil acquired the highest value, and the CRT beam in four steps was rejected to the right edge of the CRT screen. The 5th pulse through the inverter acts as a logical unit on the input 23 of the circuit 4, which is triggered, and at its output 24 a pulse is generated that translates the trigger 6 into a different state. The logical unit from the output 18 of the trigger 6 acts on the input 31 of the counter 2, the transfer of the latter to the subtraction mode, the 5th pulse, which continues to affect

at input 30 of counter 2, produces the first zeroing of the counter, which P9 subsequently proceeds at regular subsequent clock pulses, while the current in the coil is accordingly reduced by steps and the CRT beam returns to the center of the screen, the 8th clock pulse zeroes the counter, 2, and at its outputs 33 and

34 formed logical zeros.

and at outputs 35 - logical units, while the current in the coil is O, the beam in the center of the screen. The 8th pulse continuing to act through the inverter also acts on the input 25 of the circuit 5. When the logical units coincide on all inputs 25-28, the circuit 5 operates and at its output 29 generates a pulse that flips the trigger b to zero on input 17 and changes input 40 state of the trigger 12, at the output 42 of which the logical unit opens the keys 7 and 10, and the logical zero at the output 41 closes the keys 8 and 9. Thus, the switching of the keys is 7.9, and 8.10: ipo occurs when there is no current in coil. With the arrival of the 9th clock pulse, the process is repeated as with the 1st pulse, however, the current and the direction of the magnetic field in the coil changed

direction to the opposite,

and the beam began to move from the center of the CRT screen to the left.

Claims (1)

1. French patent tt 1542693, cl. H 03 K 4/02, 09.09.68.