SU424139A1 - CONTROL DEVICE FOR HIGH-VOLTAGE ELECTROLUMINISCENT INDICATOR - Google Patents

Description

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The invention relates to the field of digital computing tech nics and is implemented in devices displaying digital information with the help of electroluminescent indicators.

A device for controlling a high-voltage electroluminescent indicator is known, which contains a controllable source of voltage, produced as a common and group of transistor switches, which are interconnected by dividing capacitors and are powered by two voltage sources, and a decryptor.

However, for known devices, two voltage sources are necessary, the presence of which is caused by the absence of a transistor that would withstand the amplitude of the unipolar pulses sufficient to illuminate the high-voltage indicator.

For the purpose of broadening in the proposed device, the common-key input is connected through a resistor to the second output of the generator of rectangular pulses, inverted on the diode to the impulses received at the inputs of the indicator keys.

In the drawing, a proposed device for controlling a high-voltage electroluminescent indicator is given.

The control unit of the electroluminescent indicator contains a common trans

A cistern key 1. The input (base) of which through rectangle 2 is supplied with rectangular pulses from a generator of rectangular pulses (in the drawing is not an image). Iri this on

transistor switches 3. The number n of which is equal to the number of indicator segments, through resistors 4, to the inputs (bases) of which and the resistor 5 of the decoder (for simplicity, is shown by a single resistor at each input and output of the diffractor, and the number of inputs / n is equal to the number of outputs) and on the segments of the indicator, electrically representing capacitors 6, the common output of which is connected to the output (collector) of the common

a key, and the second output of each of them is connected to the output (collector) of one of the main keys, and a pulsed utility is supplied.

The device works as follows.

In the presence of negative impulses, both on the pr-mo r and on the inverse outputs, switching occurs (transitions from a closed state to an open n back) of both public key 1 and group of keys 3. Switching

All keys cause the presence of two-pole voltage pulses on all co-sensors (segments), while the duration and frequency of the pulses of each polarity correspond to the duration and frequency of the emulsions

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and the amplitude of each of the opposite-polarity pulses is Ei.

During operation of the device, the common key and each of the group keys acts as a charge-charging key, and when negative pulses are input to the common key, the discharge of the capacitors 6 occurs through the common key and the corresponding resistor 7, and when negative pulses enter To the inputs of the group switches, the discharge d-charge of the indicated capacitors occurs through a resistor 8 and the corresponding group switch.

The luminosity of the luminescence segments when powered from a single voltage source is achieved due to the presence of voltage impulses of different polarities due to the well-known effect of "amplitude addition, which is that when a segment is excited by single-pole impulses of a certain amplitude or alternating pulses, the sum of the amplitudes of the pulses of both polarities are equal to the amplitude of the unipolar pulse, the brightness of the segment is the same. If it is necessary to indicate the required digit, a control voltage is applied to a certain input of the decoder, by which the corresponding group keys are switched to the open state for the duration of the control voltage, while the switching off of these keys causes the corresponding segments to be excited by only single-pole pulses. with an amplitude equal to E, which do not provide a normal luminescence of the indicator segments. Thus, the luminescence of the segments not participating in the image of the desired digit is terminated.

Subject matter

A device for controlling a high-voltage electroluminescent indicator, containing a key common to all segments of the indicator, the output of which is connected to the common segment output, and indicator keys connected by inputs to the square-wave generator and to the corresponding outputs of the decoder, and the outputs to the indicator terminals of the segments characterized by that, in order to debug the device, the common key input is connected through a resistor to the second output of the square-wave generator inverted in relation to the impulse am entering the inputs of the id keys.

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