SU473955A2 - Device for measuring instantaneous values of a varying direct current voltage of different polarity - Google Patents

Description

The following and subsequent instantaneous points I and II, III and IV, V and VI. Differences of instantaneous values of At / j, for sufficiently small values

D

prolortional to the values of derivatives at points I, III and V.

To control and modes. counter 4 and device 8 indications of the derivative icon serves trigger 9.

The generator 10 IJMtpolkov with the control unit 11 forms the device element control commands fixed in Time. The control unit has control outputs: the first 12, the second 13, the third 14, the fourth G5, the fifth 16. The pulse generator 10 generates pulses with a following frequency / 2, and

bZZ / i

The input U1 of the converter 1 is supplied with voltage Uf, the output of the transducer 1 via key circuit 3 is connected to the counting input of counter 2 and through circuit 7 to the counting input of the reversing counter 4, the outputs of binary counter 2 are connected via key circuit 5 to the inputs of a digital computer and the inputs of the reversing counter 4, the outputs of which through the key circuit 6 are connected to the inputs of a digital computer, the pulse generator 10 is connected to the input of the control unit 11, the outputs 12-15 of which are connected to the control inputs of the key circuits 3, 5, 7 and 6, respectively, fifth output 16 connect ene counters with reset inputs 2 and 4 to the starting position and the zero input of the flip-flop 9, the outputs of which are connected to the inputs of the display device 8 and a counter 4, the output of the last unit is connected to the input of flip-flop 9.

The device works as follows.

Before starting, input U is applied to the input of converter 1. The block 11 receives the command Initial, by which the trigger 9 is transferred to the zero state and forms the command Subtraction (-) in the reversible counter 4, and device 8 translates to the reading "- (negative derivative); the counters 2 and 4 are reset, the input of the block 11 is closed. The generator 10 and the converter 1 are turned on.

The command "Measurement opens the input of block 11 and the first pmpulse from generator 10 generates a signal at output 12 of block I. At this, key circuit 3 opens and counter 2 records frequency pulses / 1 until the second pulse arrives from generator 10. The second pulse removes the signal from output 12 generates a signal at output 13, key circuit 3 is closed, and key circuit 5 is opened, and from the outputs of counter 2 a signal in the form of a binary code (instantaneous value of voltage t /.) ne4

It is input to the digital computer input and to the reversible counter 4.

The third pulse removes the signal from output 13 and generates a signal at output 14, key circuit 5 closes, and key circuit 7 opens. Pulses of frequency fi (instantaneous value of voltage t / d-), arriving at the counting input of counter 4, carry out a sequential subtraction of pulses from a previously recorded result.

Depending on the value of AND and t /. ,

which will be fixed in the time interval between the third and fourth impulses of the generator 10 itself, three cases are possible. If Ux x, then at the moment of equality

U and Uj values. at the output of counter 4

a signal is generated, according to which the trigger 9 goes into one state. At the same time, at the output of the trigger, a command is formed, according to which counter 4 is transferred to the summation mode, and device 8 is indicated by a positive derivative. Counter 4 records the number of pulses proportional to the value of the positive derivative.

If / c / j. , then at the end of the subtraction process, the number of 0 pulses in the counter, proportional to the negative derivative, remains in the counter.

If U.f Uj. , then counter 4 is in

21

the zero state and the derivative is zero.

The fourth pulse removes the signal from output 14 and generates a signal at output 15, key circuit 7 closes, and key circuit 6 opens. Counter 4 result

charged to the input of a digital computer.

Fifth pulse removes the signal from output 15 and generates a signal at output 16, the action of which is similar to the command “Original.

5 With the arrival of the most successful and next impulses, the process of measuring the second, third, etc. instantaneous values of the voltage f /. and the derivative at the measurement points (regions) continues.

0 If there is no voltage U at the input of the converter 1, the counter 2 will at the times to, ti, t -, ..., t (Fig. 26) fix binary numbers proportional to the value of the voltage C / o5 When connected to the input of the converter 1 the voltage U. of positive polarity, the binary numbers at the output of the device at times to, / t t2, ..., t will be proportional to Uo + U,

With a negative polarity, the binary numbers at the output of the device at times to, ti, tz, ..., t will be proportional to UQ-C / r.

5 At the command of the "Source device, it stops metering values and sets to its original position.

The command “Measurement of instantaneous values of U + UQ can be continued.

The device can be used as a phase-to-binary converter, if a phase detector is connected to the converter 1 input (Fig. 1) and alternating frequencies of the same frequency and out-of-phase are applied to the detector input, then the DC signal is output from the output of the phase detector positive or negative polarity, proportional to the phase shift. When the device is put into operation, signals from the binary code proportional to the phase shift will be sent to the input of the digital computer from the output of binary counter 2 through the key circuit 5.

The magnitude of the binary code can be estimated and the sign of the phase shift: if N., No, where; Vo is the binary signal at the device output at L. О, then the sign of the shift is positive; if - the sign of the shift is negative; if N NQ - phase shift is absent.

Subject invention

Device for measuring instantaneous

values of varying voltage of direct current of different polarity on the author.

St. No. 411379, characterized in that, with the aim

extending functionality

In Lego entered reversible binary counter, trigger, display device sign

Voltage derivative, with inputs

the reverse binary counter is connected to the trigger outputs, the inputs of the derivative display device and through the key circuits — with the binary counter and voltage converter outputs; the reverse binary counter outputs are connected to the input. trigger keys and through the key circuit to the inputs of the registering device, the first, second, third and fourth outputs of the control unit are connected respectively to the control inputs of the key circuits at the outputs of the voltage converter and the binary counter, on the input and output of the reversible binary counter, fifth the output of the control unit is connected to the inputs of the binary

counter and reverse binary counter and zero trigger inputs.

with

TO/

in i