SU777594A1 - Indicator of phase ratio of two voltages - Google Patents

Description

one

The invention relates to a phase-measuring technique, can be used, in particular, when setting up computer devices.

A phase relation indicator is known, comprising input repeaters, RC-MOCT, summing devices, rectifiers and device 1.

The disadvantage of the known indicator is the significant error associated with the use of rectifiers and the device.

The indicator of the phase ratio of two voltages is known, which contains two shaping channels, two triggers, one of which operates in the frequency recalculation mode, and the second in the pulse duration shaping mode, five diodes connecting the triggers and the shaping channels, and the switch device , connected between the output of the trigger operating In the mode of frequency recalculation 2.

A disadvantage of the known indicator of the phase ratio of two voltages is the presence of a zero phase shift offset, which is mainly determined by the duration of transients caused by the uncertainty of the state of the triggers with the same phase voltage and the accuracy of the switch instrument.

2

The purpose of the present invention is to increase accuracy.

The purpose of the invention is achieved by the fact that the indicator of the phase ratio of two voltages, containing the first and second drivers, triggers and resistors, is equipped with an OR-NOT element, an inverter, a first and second AND-NOT element, a D-trigger, a state analysis unit

10 triggers and the first and second LEDs, with the OUTPUTS of the first and second drivers being connected respectively to the R-BXO of the first, the S-input of the second trigger and the first INPUT of the OR-NOT element and

15 S-input of the first, R-input of the second trigger and the second INPUT of the element OR NOT, the OUTPUT of which through the inverter is connected to the C-input of the D-trigger, the S-input of which is connected to the OUTPUT of the state analyzer

20 triggers, the first, second, third and fourth INPUTS of which are connected respectively to the direct and inverted outputs of the first and second triggers, the direct OUTPUTS of which are connected respectively to the first inputs of the first and second elements AND –NE, the second inputs of which are connected to the output D- the trigger, the outputs of the first and second elements AND-NOT are connected respectively to the anodes of the first and second LEDs, the cathodes of which

3

interconnected through the first and second resistors.

The drawing shows the electrical diagram of the indicator of the phase voltage of two voltages.

The indicator of the phase ratio of the two voltages consists of the first and second formers 1 and 2, the first and second triggers 3 and 4, and the block. Analysis of the BOS of the Bench Trigger 5, D-Trigger 6, Inverter 7, the element OR NOT 8, the first and second elements AND 9, 10, the first and second LEDs 11 and 12, the first and second resistors 13 and 14.

The work is as follows.

The incoming at inputs 15, 16 of the inverter 1 and 2 are compared to the phase periodic oscillations npeo6pi 3yibtcHB sequences of short pulses arriving at the R, S-inputs of the flip-flops 3, 4 and at the inputs of the element OR-HE 8.

If the voltage at input 15 is ahead of the voltage of input 16 in phase, the first trigger 3 is set to the state "1 pulse from the output of the driver 1, and after a period of time corresponding to the voltage shift phase, the first and second triggers 3 and 4 are set to states, respectively, "1," On the impulse from the upstream of the driver 2. POSITION: Serial and second triggers 3 and 4 are in positive-digit states, the positive potential is applied to the S input of the D-trigger 6 from the state module of the trigger 5. and the pulses from the formers 1 and 2 over the OR-NOT 8 element and the inverter 7 set the D-flip-flop 6 to the "O" state, and to the inputs of the first and second elements, N-9 and 10, the resolving positive potential is fed from the inverse output of the D-flip-flop 6, since the second input of the first element I-HE 9 with lifjjfMoro output of trigger 3 receives the enabling potential, and the second second element I-NE 10 from the output of trigger 4 prohibits, the first LED 11 is connected via the first resistor 13 to the power source, signaling the sign of the phase shift.

In the event of a lag in the phase of the voltage of the input 15 relative to the voltage of the input 16, the second LED 12 is connected via the second resistor 14 to a power source.

With the synphasic nature of the compared voltages and pulses from the outputs of the formers 1 and 2 coincide in time. In this case, the states of the first and second triggers 3 and 4 are uniqueness, as a result of which a negative impulse comes from the triggers state analysis block 5 to the S input of the D flip-flop 6, which sets the D-flip-flop 6 to the state "1." On the first and second elements AND-NOT 9 and 10 with in4

The D-flip-flop output 6 is a prohibitive signal, and the first and second LEDs 11 and 12 do not turn on.

The accuracy of the registration of the in-phase comparison is determined by the width of the dead zone in which the first and second LEDs 11 and 12 are turned off and which depends on the duration of the pulses of the shaping channels and the frequency characteristics of the first and second triggers 3 and 4.

The presence of a clearly pronounced deadband of the device allows a more accurate determination of the degree of synphasis of the voltages compared in phase, and the use of two LEDs as indicator indicators eliminates the errors of the prototype needle indicator.

The model of the indicator is made on the microcircuits of the K155 series and tested on the equipment of the EU 5012-01.

Claims (2)

1.Ornatsky P.P., RedukNyuk Yu.A. and Skripyik V.I. Measuring instruments Periodi Yokogo Eraviyei, M., “EyerTI, 1975, p. 14-15. 2. Avtorskoe svidyoTylestyo USSR №252469, cl. G 01R 25/00, 1968 (prototype).