SU450175A1 - Device for controlling decoders - Google Patents

Description

one

The invention relates to the field of automation and computing.

Devices for controlling decoders are known, each containing two diode cells connected in a specific order to the outputs of the decoder, as well as logical “NO” logic circuits that can detect the appearance of spurious signals and the absence of a true signal at the output of the decoder. A false signal is detected when it already exists at the output of the decoder, which is often unacceptable and requires additional devices to protect against false signals.

In order to extend the functionality in the proposed device, a cell is connected to each output of the decoder, which is a coincidence circuit and has a transformer connection with the subsequent cell according to the known sequence of excitation of the decoder. A signal can appear at the output of a cell only if the signals coincide in time at the corresponding output of the decoder and the connection winding of the previous cell when it is turned off.

The drawing shows a diagram of the proposed device.

The device contains a decoder 1, control cells 2 and a normal operation control cell 3. Cell 2 contains a series-connected transistor 4, a differentiating transformer 5 having a coupling winding 6 and an output winding 7, and a thyristor 8. Diodes 9 and 10 serve to cut off negative pulses polarity of the respective windings.

Cell 3 consists of a transistor switch AND

and pulse transformer 12.

The device works as follows.

NRI correct operation of the decoder 1 in

the excited state is only

one output, while the transistor 4 and the thyristor 8 of the corresponding cell are open and at its output there is a true signal.

According to the principle of operation of the descrambler during the excitation of the next output signal

from the intermittent, previously excited, output is removed and the transistors of the respective cells take on states according to the outputs of the decoder. In. Moment of turning off the transistor of the previous cell on the windings 6 and 7

pulses appear, one of which turns on the thyristor 8 of the next cell and a true signal is sent to its output, and the other impulse arrives at cell 3 and when it coincides with the sync pulse on the output winding of the traissor of matrix 12, a signal appears confirming the normal operation of the device. Sync pulses arrive simultaneously with the code change “a. The input of the decoder.

If a sequence is broken or a false signal is generated at the output of the decoder, the cell corresponding to this output prevents the false signal from passing because the thyristor 8 is open only if the previous cell is switched from an excited state to an off state. If this condition is violated, the thyristor 8 is closed and “there is no signal in the output of cell 3, which indicates a malfunction in the device.

Subject invention

A device for controlling decoders containing control cells connected to

corresponding to the outputs of the decoder, characterized in that, in order to expand the functional capabilities, the control cells are made in the form of a series-connected transistor, a differentiating transformer and a thyristor, and the bases of the transistors of the cells are connected to the corresponding outputs of the decoder, the control electrode of the thyristor of each subsequent cell is connected through a diode the secondary winding of the differentiating transformer of the previous cell, and the other secondary windings of the cells are connected in series with each other A diode with a transistor and a differentiating transformer of an additional control cell, the transistor base of which is connected to the clock generator, and the output winding of the differentiating transformer is connected to the control output terminal of the device.

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