SU450351A1 - Dynamic display device - Google Patents

Description

one

The device can be found (used in automation and measuring technology in the design of digital equipment).

A digital counting device with dynamic indication is known, where the i-nadicadia circuit contains digital indicators, a generator of increments, a phase distributor and counting magnetic decades, and the output of the generator of increments is connected to the inputs of the decades and the phase distributor. indicators of all bits, and the outputs of the decades - with the common electrodes of the above indicators. The digit in some kind of luminous discharge is lit when the phase of the distributor pulse coincides with the overflow pulse of the corresponding decade.

A disadvantage of the known device is the lack of ino synchronization ino of the duration of the distributor pulses and the overflow pulses of the decades. While the duration of the pulses of the first frequency is equal to the frequency of the generator, the duration of the overflow pulses is determined by the decade scheme, its components, and in each particular case is different. If it expresses the duration of the impulse of the phase of the distributor, then the backlight of the other digit appears, if it is less, some of the energy consumed for burning the indator of the cat is lost. With pulse durations (overflows of decades, on the order of a few microseconds, the known scheme is generally unsuitable for gas-discharge indicators, since a microsecond pulse does not cause X to catch fire because of inertia.

The purpose of the invention is the introduction of synchronization. For the duration of the pulses commuting the common and digital electrodes of the a-shdikator. This is achieved by the fact that the device additionally contains in each decimal place a trigger with separate AND inputs, with "a single input of each trigger connected to the output of the corresponding counting decade," a single output to the common indicator electrode, and "zero inputs of all the trigger | and connected to the output of the pulse generator, the input of the distributor and through the additionally introduced delay line with the inputs of the counting decades.

-bia FIG. 1 shows a functional diagram of the proposed device; in fig. 2 shows the timing diagram of the device.

They; pulses from the output of the generator 1 (see FIG.

2, aj are fed to the input of the distributor 2, which sequentially commutes digital electrodes 3 of the Indicators 4, to the "zero inputs T | of the riggers 5 and through the delay line 6 (see Fig. 2.6) to the inputs of decades 7. Delay is necessary. in order to momentum

overruns a decade from its output (see Fig. 2, e) - entered the "single input of the trigger 5 after the generator pulse, which returns the trigger to the initial (" zero "state). Thus, the duration of the demand and the trigger in the “single state / g is equal to

f - T f

t - g s

where Gg is the period of the frequency of the generator. Pulses; tz - delay line delay value.

The coincidence of the "single state of the trigger with the corresponding phase of the distributor causes ignition of the indicator digit. The duration of the phase is equal to and differs from the value of IT by the value of the set of 4 -Gy. Usually, GG is in the order of milli-seconds and a-mik.-seconds, so practically the pulse arriving at the common electrode 8 of the indicator (see Fig. 1, r} has an IT duration equal to the oscillator frequency period, not dependent on the duration of an overfull decade.

The proposed scheme is universal for devices with dynamic indication.

method of increment. It is applicable both in conjunction with IN-8 lamps, and with seven-segment indi-cator. In the latter case, the distributor includes a dololnitel th decoder that converts the decimal code into the code of indicator segments.

Subject invention

A dynamic indication device comprising digital indicators, an oscillator generator, a dispenser, and counting decades, characterized in that, in order to synchronize the pulse duration commuting the common digital indicator electrodes, it additionally contains a trigger with separate inputs, At that, "a single input of each trigger is connected to the output of the corresponding counting decade," a single output to the common electrode of the indicator, and "zero inputs of all the flip-flops are combined and connected to Exit pulse generator, the input of the distributor, and further through

The delay line entered with the inputs is the account of the 'decades.