SU1171749A2 - Comparing device - Google Patents

Abstract

1. DEVICE COMPARISON on author. St. 1004959, so that, in order to extend the functionality by forming a code proportional to the result of the dR of the statement, and to increase the reliability of the comparison results, a register has been entered in it, the information inputs of which are connected to the third the output of the generator of linearly varying voltage, and the switch, the first and second information inputs of which are connected to the outputs of the first and second triggers, the output to the control input of the register, and the control inputs of the switch to the control input Properties.

Description

four

;about

2. The device according to claim 1, characterized in that the third information input of the switch

connected to the output of the third trigger, the outputs of the register are additional outputs of the device.

one

The invention relates to digital measurement technology and can be used in automatic voltage control devices and is an improvement of the known device described in ed. St. .. № 1004959.

The purpose of the invention is to enhance the functionality by generating a code proportional to the result of the comparison, and increasing the reliability of the results of the comparison.

FIG. 1 shows a block diagram of the device; FIG. 2 - time diagrams; on his work

Comparison device contains linearly varying voltage generator 1, comparator 2, code comparison elements 3 and 4, triggers 57, elements AND 8-10, W 11 and 12 elements, register 13, switch 14, clock generator 15, summing counter 16 , and; if analog converter 17, device inputs 18-21, device outputs 22-27.

The linearly varying voltage generator 1 has a first output, from which the analog linear voltage variation is removed, a second output, on which the signal receives, for example, a logical zero value when the generator 1 is set to its original state, and a third output, on which a digital code is generated that is proportional to the instantaneous value of the analog linearly varying voltage. The generator can be performed, for example, on the basis of a digital-to-analog converter (DAC). At the same time, it contains a DAC 17, a summing counter of 16 pulses, the outputs of the bits of which are connected to the inputs of the bits of the DAC 17 and to the third output of the generator 1, the generator 15 clock pulses. The first output of the generator 1 is the output of the D / A converter 17,

and the second is the output of overflow pulse counter 16.

The register 13 with the parallel input of information information inputs 5 is connected to the third output of the generator 1, and the outputs to the output 27 of the device. Logic switch 14 inputs connected to the corresponding outputs of the triggers 5-7, output 10 to the input of the register 13, and the control inputs to the control input 21 of the device. .

The device works as follows.

15 Upon turning on the power, the triggers 5-7 counter 16 pulses and register 13 are set to an arbitrary position and the generator 15 pulses is started. The pulses from the output of the latter are fed to the input of the counter 16 and are subsequently accumulated in it. At time t, (FIG. 2) the counter overflows 16, a pulse appears at the second output of generator 1

25 overflows, which sets the triggers 5-7 to their original position, as a result of which, at the inputs of the switch 14 connected to the corresponding outputs of the triggers 5-7, the Log levels are set. A. At the first output of the generator 1, the voltage U becomes zero. From the moment t (initial position), the operating cycle of the device begins.

The pulses from the output of the generator 15 are fed to the input of the counter 16 and are successively accumulated in it. In this case, at the first output of the generator 1 (output of the D / A converter 17), a stepwise linearly varying voltage C is formed, and at its third output a coded digital equivalent of the linearly varying voltage is formed. Voltage U, | 5 inputs one input of comparator 2, to the second input of which from the input 18 of the device receives a controlled voltage Uj, the digital equivalent voltage and from the third output of generator 1 goes to the first groups of inputs of elements 3 and 4 of the code comparison and to the information inputs of the register 1 The second group of inputs of the element 3 from the device input 19 goes to the N lower tolerance, the second group of inputs to the element 4 from the input 20 of the device receives the upper tolerance code N, and 2 From the output of the comparator 2 enters at the time tj, when the voltage pulse U before The value of voltage U, and V and. 2 п and, where п - the number of bits of the counter UO, the reference voltage of the DAC; i is the bit number of the binary number; d- is the sign (digit) of the binary numeral system, which takes values 0 or 1, is a code proportional to the voltage U, Impulse and from the output of comparator 2 switches trigger 6. B moment tj 5 when the third generator output 1 code reaches the value of code N, the output of the comparison element 3 is U, a pulse that switches the trigger 5. At the time t, the code at the third generator output 1 reaches the code N, the output of the comparison element 4 causes the pulse and that switches the trigger 7 Depends on the ratio of N to the controlled n .Ujf direct voltage and codes N and N has the lower and upper tolerances respectively comparing device generates the outputs 22-26 comparison results in complete accordance with the known algorithm for. At the end of the cycle, at the second output of generator 1, an overflow pulse U of counter 16 (level Log. O) appears and the comparator is set to its initial position. The process then repeats. In order to obtain a code proportional to the voltage U, in the course of recording the linformation of the register 13 is connected via switch 14 to the output of trigger 6, for which the corresponding code is fed to the control inputs 21 of switch 14. B moment tj pulse U from the code of the comparator 2 switches the trigger 6, resulting in the output of the trigger 6, and through the switch 14 and the input recording the information of the register 13, the signal U from the state Log. About goes to the state Log. 1. On the switching edge of the signal and at the moment Sz, the state of the third output of generator 1 is recorded in register 13, which, in accordance with formula (1), is proportional to voltage U. register output 13 and code Nj (goes to device output 27). The lower tolerance entry of the information register entry 13 is connected via KOMNfyTaTop 14k to the output of the trigger 5, for which the corresponding inputs are sent to the control inputs 21 of the switch 14. The moment tj with the status code of the third output of generator 1 is equal to the code N of the lower tolerance pulse Uj from the output the code comparison element 3 switches the trigger 5, as a result of which the output of the trigger 5, and through the switch 14 and the input of the recording of the information of the register 13, the signal Uj- from the Log.O state goes to the Log1 state. at time t, the state of the third output of generator 1, which is equal to code N, is written to register 13. From output of register 13, code N goes to device output 27. In the same way, the upper tolerance code N is monitored. through switch 14 to you ode trigger 7 and the information recording occurs in the time tj to the front switching signal U. It should be noted that the recorded code in the register 13, the code N equal to or Nj, is the result of most functional blocks comparing device. For example, if any of the bits in blocks 3, 4 and 16 fail, if the blocks 5-7 and 15 fail, the code N or NJ on the output 27 of the device is not formed and the device has compared a fault. As a result of monitoring the N and NJ codes, a deep check of the operability of the entire device is carried out, thus achieving high reliability of the comparison results.

P

and,

n

and.

Un

t2 3

i.i,

FIG. 2

Claims (2)

1. COMPARISON DEVICE by ed. St. No. 1004959, distinguished by the fact that, in order to expand functionality by generating a code proportional to the result of the equation and increasing the reliability of the comparison results, a register is introduced into it, the information inputs of which are connected to the third output of the generator linearly a changing voltage, and a switch, the first and second information inputs of which are connected to the outputs of the first and second triggers, the output to the control input of the register, and the control inputs of the switch to the control input of the device. Fig! 2. The device according to π, 1, characterized in that the third information input of the switch is connected to the output of the third trigger, the outputs of the register are additional outputs of the device.