SU759965A1 - Light scale control device - Google Patents

Description

The invention relates to electrical measuring equipment, namely, control devices for the light scale, and can be used in indicator devices of various designations.

A device for controlling a light scale is known, which contains light-emitting elements of the scale, a decoder and switches. The device displays 10 on the scale of the luminous mark [12 ·

The disadvantage of the device lies in the low reliability of the display of information, which is reflected in the loss of information at certain points in time 15 when one of the elements of the light scale fails.

It is also known (E is the control unit of the light scale containing the light elements of the scale, 20 which are combined into several groups and in each group are connected in series, a synchronizing generator, counters, memory register, decoders and a constant source 25. The device displays a luminous line on the scale £ 2 ^}.

The disadvantage of the known device

consists in the complexity due to the presence

Meters and register memory. ' thirty

The closest technical solution to the proposed is the control unit of the light scale, containing the decoder and the elements of the light scale, which are connected by a matrix, a constant generator, a set of coincidence circuits and a set of combining circuits. The device displays a luminous line on the scale. The essence of the operation of this control scheme is reduced to a periodic one, with a frequency at which the eye does not distinguish; flickering (usually 20-30 Hz), the series connection of a number of groups of light-emitting elements of the scale to the energy source. Therefore, the time during which each of the elements of the scale is connected to a power source is

_t _) _

.. ^{T =} 2_GM- £ '

where t is the number of groups of elements in the whole

scale}

ί - the repetition frequency of the cycle of connecting elements [3].

However, a small amount of time V leads to the need to increase the amplitude of the current through the scale element to maintain sufficient integral luminance of the scale. And the increase in the amplitude of the current pulse through the element

leads to the acceleration of the process of degradation of the elements of the scale, " ^- '..........

The purpose of the invention is to increase the durability of the light-emitting elements of the scale and simplify the design.

This goal is achieved by the fact that a clock generator and switches are introduced into the light scale control device containing the decoder and the light scale elements that are connected by a matrix. The control inputs of the switches are connected to a clocking generator, the signal inputs with the outputs of the decoder, and the outputs of the switches - with busbars of rows and columns of the matrix of elements of the light scale.

The drawing shows a block diagram of the control device of the light scale.

The control unit of the light scale contains a decoder 1, the outputs of which are connected to the signal inputs of the switches 2,3,4,5,6 and 7. The control inputs of the switches 2-7 are connected to the output of the clock generator 8. The outputs of the switches 2-7 are connected to the line buses and columns matrix readout device 9 formed by the elements of the light scale.

The code corresponding to the value of the displayed value is fed to the input of the decoder 1. The decoder 1 performs the functions of converting the input code into four groups of output signals. The first group p is represented by one output, which has a potential corresponding to a constant supply of energy to the matrix reading device 9. The second and third groups of outputs m and n, are m and n 'outputs, respectively (where m and η are the number of rows and columns respectively in the matrix readout device. 9). As a result of the transformation of the input code, these groups of outputs have linear codes, i.e. characterized by the presence of potentials corresponding to the supply of power to the reading device 9, on all outputs corresponding to smaller numbers than indicated. The fourth group of outputs Пг is represented by n outputs позиThere is a position code on this group of outputs, i.e. a code characterized by the presence of a potential corresponding to the supply of energy to the reading device 9 at one of the n outputs: at the output corresponding to the indicated value. Group outputs p and w (t +1 total yield) intended to control the LSB, and outputs the group n, and n _g (total 2 η O) - to control the MSB of the matrix elements of the light scale 9. Total decoder outputs 1 is 2 η + t * 1, where t and η are the number of rows and columns

) U5 ·, (low and high bits) in the reading device 9. Decoder 1 (Connected by all its outputs to the signal inputs of the switches 2-7.

This is done as follows.

Yield 5 p decoder 1 is connected with similar signal inputs switches 2-4 LSBs reading device 9. Group O <n connected to the respective Drew (0 ^gimi homonymous signal vhodamikommutatorov 2-4 LSBs. Group outputs coupled to respective inputs homonymous signal switches 5 -7 senior categories. Group O n _g soe'5 dinena with other relevant homonymous signal inputs switches 5-7 senior categories. If you look at all the switches 2-7 together, to one eponymous signal20 nym inputs connected switches groups of outputs of p and n, the decoder 1 and to the other of the same name -. O group m and n _g The timing generator 8 connected to the control switches 2-7 vho25 rows frequency timing pulses not selected Ay 20-30 below. and the duty cycle of pulses is 8 = 2, so that the operator’s eye does not distinguish flickers caused by switching groups of light-emitting elements.

The switch outputs are connected to a matrix reading device 9, and the outputs of switches 2-7 are connected to the junior and senior buses of the reading device 9.

The displayed value presented in the code is fed to the input of the decoder 1. In decoder 1, the input code is converted into four 40 other codes, which were mentioned above. Next, from the output of the decoder 1, four groups of codes are fed to the signal inputs of the switches 2-7. The clock generator 8 generates clock pulses with a duty cycle of 8 = 2 and a frequency of ί more than 20-30 Hz, which ‘’ arrive at the control inputs of the switches 2-7. This control signal, acting on the switches 2-7, provides control of the matrix readout device 9, then in accordance with the output potentials), p and hz, then in accordance with the output potentials (u and n ~ the decoder 1.

55 in the first half of the oscillation period of the clock generator 8, the power is supplied to all full low-order digits of the reading device 9, from among those elements that participate in the display in this period, and in the second half of the period to the other elements participating in the display, t. e, to the elements of one junior level, which is not complete and after £ 5 blows after the last of the lower ranks,

75E9 & 5

to which the power was supplied in the first half of the oscillation period of the clock generator 8.

Consequently, the light-emitting elements of the matrix reading device 9, which are among the full low-order digits of the indicated value, or the light-emitting elements of the next, incomplete low-order bit of the indicated value, alternately burn.

Due to this co-derivation, the time is significantly increased, during which energy is supplied to the elements of the scale. So, for example, for a light scale in a device of accuracy class 1 of tp = 100 light-emitting elements with a switching frequency of 1 = 50 Hz, each of the elements of the scale turns out to be connected to a power source for half the switching period

ten

,five

20

In the known device under the same conditions, each of the elements of the scale is connected to a power source for

„ ^Г П = ^с ·

So, in this case, the time during which a current flows through the scale element is q = 5 times

more than in the known device. Therefore, to maintain the same average current through the element, and therefore the same integral brightness, the amplitude of the current through the element of the known device is 5 times greater than in this

25

thirty

35

control scheme. This facilitates the mode of operation of the light-emitting elements of the scale and increases their durability. In addition, reducing the amplitude of the current pulses through the switching elements allows the use of transistors in the switches designed for smaller amplitudes of the currents. These transistors have a smaller mass and size, which allows reducing these parameters for the entire control unit of the light scale.

Claims (1)

Claim The control unit of the light scale containing the decoder and the elements of the light scale, which are connected by a matrix, characterized in that, in order to increase the durability of the light-emitting elements of the scale and simplify the design, the clock generator and switches are introduced, the control inputs of the switches are connected to the clock generator, signal the inputs are with the outputs of the decoder, and the outputs of the switches are with the rows and columns of the matrix of the elements of the light scale.