SU467333A1 - Device for controlling the duration of transients - Google Patents

Description

one

The invention relates to the field of automatic control and can be used to control the dynamic parameters of various objects.

Known devices are comparison-two frequencies containing pulse shapers, the outputs of which are connected to the inputs of the first trigger, the output connected to the input of the averaging cell, the output of which is connected to the input of the counter, as well as the sensor, time connected to the logic cell, and the generator connected with the counter and the first driver.

A disadvantage of the known device is the inability to control the time of the transient frequency setting process.

The purpose of the invention is to increase the reliability of the control device.

This goal is achieved by the fact that the device contains a second trigger, the first input connected to the output of the counter, and the second to the generator, a key, the first input to the ConnectionFieHHbm to the output of the second trigger, and the second to the output of the generator, and a storage unit, the first input to which is connected to the output of the counter, the second - to the output of the key, and the output - to the input of the logic cell.

The drawing shows a structural diagram of the proposed device.

The proposed device consists of 1 and 2 formers, trigger 3, average 4 cells, pulse counter 5 seconds before HOIS, trigger 6, key 7, cumulative block B, time sensor -9, logical 10 and tunable generator 11. The device works as follows. The reference frequency / frequency from the tunable generator and the variable frequency fx (duration of the transient process), the establishment of which is required to be monitored, is sent through the formers 1 and 2 to single and zero respectively the inputs of trigger 3. At the output of trigger 3 a sequence of pulses is formed, the duration of which is variable it varies periodically with a frequency equal to the difference of the studied and reference frequencies, being a sequence of pulses, width-modulated by a sawtooth signal oh form. At the output of averaging cell 4, a sequence of pulses is formed, whose frequency is equal to the modulation frequency of a sequence of pulse-width modulated pulses,

arriving at the input, i.e. the difference of the studied and reference frequencies. Pulse counter 5 counts these pulses over the counting periods specified by the clock pulses at the reset input of the pulse counter 5 from the tunable generator 11, as a result of which the pulse counter 5 accumulates a number with a speed proportional to the difference between the reference and investigated frequencies. At the beginning of the transition process, the difference between the reference and the studied frequencies is large and, therefore, in one counting period the pulse counter. 5 reaches overflow several times. The cycle clock from the tunable generator I is fed to the reset input of pulse counter 5, to single trigger input 6 and to input 7. Trigger 6 was set to zero overflow pulse of counter 5 in the previous counting period, so key 7 is closed and the tact pulse does not pass through it. In the transition process, the difference between the reference and the studied frequencies is reduced. When the difference between the reference and averaged frequency during the counting period of the studied frequencies becomes less than acceptable, the pulse counter 5 during the counting period will not have time to overflow, which is provided by presetting the recalculation module (capacity) of the pulse counter 6. Because the pulse counter 5 has not overflowed, an overflow pulse, and a trigger 6 set to a single pulse state. tact at the beginning of the counting period, did not change its state until the next pulse of the clock arrived. This pulse will pass through the key 7 to the input of the block b, which serves to increase the reliability of the correct operation of the device. So, if in several subsequent counting periods following each other (their number is determined based on a priori information about the nature of the transition process), the impulse from key 7 arrives at the input of the accumulative block I, the accumulative block will output a pulse to the logical cell 10 transient frequency setting. Time sensor 9 starts with the beginning of the transition process and issues

impulse to the input of the logic circuit at the time corresponding to the permissible duration of the transitional frequency setting process (taking into account the time of additional control). Logic cell 10 depending on the order of arrival of the pulses from block 8 and the time sensor. 9 generates a signal "Not fit or" fit, which indicates the excess of the norm of time of the transition process

or being in admission accordingly.

It should be noted that since simultaneously with the tuning of the reference frequency of the tunable generator 10, the frequency of the pulses setting

the counting period, then the presetting of the pulse counter 5 can express in%% the error in determining the equality of the reference and investigated frequencies (i.e., the allowable difference), regardless of the value of the reference frequency.

Subject invention

A device for controlling the duration of transients, containing pulse drivers, the outputs of which are connected to the inputs of the first trigger, the output connected to the input of the averaging cell, the output of which is connected to the input of the counter, and

also a time sensor connected to a logic cell, and a generator connected to the counter and the first driver, characterized in that, in order to increase the reliability of control of the device, it contains a second trigger, a first input connected to the output of the counter, and the second to the generator, a key, the first input connected to the output of the second trigger, and the second to the generator output, and a storage unit,

the first input of which is connected to the output of the counter, the second - “to the output of the key, and the output to the input of the logic cell.

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