SU1239627A2 - Phase shift-to-time interval converter - Google Patents

Abstract

The device relates to the measurement technique, can be used in the measurement of phase shifts in analog and digital phase meters. The aim of the invention is to expand the operating frequency range. The known device contains triggers 1 and 2, shapers of short pulses 3 and 4, source 5 of the reference voltage, integrators 6 and 7, keys 8, 9 and 10, inverter 1, detector 12 zero, auxiliary trigger 13. For expansion working frequency range introduced J) -trigger 14, inverter 15, elements 6 and 17. The device allows to transform the phase shift into a time interval, regardless of the period of the input signals. The operating frequency range of the input signals in the proposed device is more than an order of magnitude wider than that of the well-known because of the fact that the reference voltage is inversely proportional to the period of the input signals. The converter can work in automatic direction, repeatedly. Produces the transformation of the phase shift of the input signals in the time interval. 2 sludge. with i9 (L (h

Description

The invention relates to a measurement technique and can be used in measuring phase shifts in analog and digital phase meters. The aim of the invention is to expand the operating frequency range. Figure 1 shows the block diagram of the converter; figure 2 - timing charts of the device

The phase shift converter contains the time interval 1, the first trigger 1, the second trigger 2, the first driver 3 short pulses, the second driver 4 short pulses, the output of the first short and ple driver is connected to the first input of the first trigger, the second input of which is connected to the output of the second short driver pulses and with a counting input of the second trigger, source 5 horn voltage, first integrator 6, second integrator 7, first key 8, second key 9, third key 10 inverter 11, detector 12 zero, optional the trigger trigger 3, the output of the voltage source, is connected to the potential inputs of the first and second keys, the control inputs of which are connected respectively to the output of the first trigger and the direct output of the second trigger, the inverse output of which is connected to the first inputs of the third key and the additional trigger, the output of the first key Through the first integrator and the zero detector is connected to the second input of an additional trigger, the output of which is the output of the device, the output of the second key through the second interface and the investment Torr connected to the second input

The third key, whose output is connected to the input of the first integrator, 1-trigger 14, input C of which is connected to the output of the second short pulse generator, input HF through the inverter 5 to the additional trigger output, input D to the additional trigger input and the input of the first element And 16, the output of which is connected to the inputs of zeroing of the integrators, the inputs of the second element And 17 and the source of the reference voltage, the second input of which is connected to the output of the second element

And, the second input of which is connected via the third driver 18 pulses to the inputs R, of the first and second

five

ten

15

20

396272

the flip-flops, the output D of the flip-flop and the second input of the first element I, the input signals are fed to the inputs of the first: and second shapers of short I1 1 pulses, and the output - from the output of the additional flip-flop.

At time t, the triggers 1, 2, 13, and 14 are in the zero state (Fig. 2c and b). At time t, the voltage across the rising voltage Ua (FIG. 2 b) through the zero shaper 4 generates a short pulse (FIG. 2z, which transfers the trigger 14 to a single state (FIG. 2). On the leading edge of the voltage drop , the output of the trigger 14, the driver 18 generates a pulse (FIG. 2i) passing through the element AND 17 to the input of the source of the reference voltage 5. At this output, the output of the source 5 is the maximum Bo; iMoxHoe for the applied element base voltage and then it begins to decrease (Fig. 2k |. I enter the integrators 6–25 and 7 t zeroes signals. At time t3, when the next pulse arrives from the output of shaper 4, triggers 1 and 2 (Fig. 2e,} go to one state, the voltage at the output of voltage source 5 stops at the level at which it was at time t h.

Thus, a voltage H0 appears in the output of the voltage source 5, inversely proportional to the period of the input signals. The zeroing signals from the integrators 6 and 7 are removed, and the keys 8 and 9 connect them to the output of the source 5 of the reference voltage. The operation of integrating the voltage Uo is performed (Fig. 2l, m)

At the moment of time .ц on crossing the zero of the increasing first sig. The pulse (Fig. 2c1.) at the output of the first driver 3 appears a pulse, which translates the trigger 1 into the zero state. On the integrator 6, the voltage t is memorized.

3

35

40

45

50 Uoti-

where and is the time constant of the integrator 6.

At time t 5, a zero-crossing transition of the second signal 35 takes place (fig., At the output of the second shaper 4, a pulse appears that takes the triggers 2 and 14 to the zero state, the trigger 13 is transferred to the single state ( Fig. 25). The signal from the output of the trigger I3 is fed to the input of the initial installation of the trigger 14, blocking the device so that its mode of operation does not change until the signal at the output of the trigger 13 ends. At the same time, the key 9 disables the integrator 7 from the sources 5 reference voltage and at the output of this integra torus stored voltage

and uon- | -; .

where T is the period of the input signal;

 the integrator time constant is 7,

At the same time, the key 10 connects the output voltage of the integrator 7 through the inverter 11 to the input of the integrator 6. In this case, the integrator 6 integrates the output voltage of the integrator 7, taken with the opposite sign. Voltage at the outlet. The integrator 6 starts to decrease linearly and at time t: - crossing it through zero, the detector 12 zero produces a signal that triggers the trigger 13 to the zero state. Scheme prepared for the next launch.

The pulse duration at the output of the trigger 13 can be determined by the formula

where K is a proportionality coefficient that does not depend on the period of the signals.

Thus, the proposed device allows for the conversion of a phase shift to a time interval regardless of the period.

yes input signals. Moreover, the working frequency range of the input signals in the proposed device is more than an order of magnitude wider than in the known one due to the fact that the reference voltage is inversely proportional to the period of the input signals ..

In addition, the proposed converter, unlike the known one, can operate in automatic mode j by repeatedly producing the transformation of the phase shift of the input signals in the time interval.

Claims (1)

Invention Formula Phase shift converter in the time interval for auth. Sv. № 678666,0 Clicking with so that, in order to extend the working frequency range, a D-flip-flop, a third pulse shaper, an inverter, the first and second And elements, are entered into it, with the input From the entered B-flip-flop, it is connected to the output of the second shaper, input f through the inserted inverter is connected to the output of the additional flip-flop, input D is connected to the first input of the additional flip-flop and the input of the first element I, the output of which is connected to the inputs of zeroing the integrators the source of the reference voltage, the second input of which is connected to the output of the second element I, the second input of which is connected through the third pulse shaper to the inputs fi. first and second trigger D trigger and the second input of the first element And .. but 5 ё g 8 f. 3 and to m Compiled by V.Shubin Editor L.Gratillo Tehred M.Hodanich Proofreader G.Reshetnik Order 3391/45 Circulation 728. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035,. Moscow. Zh-35, Raushska nab., D.4 / 5 Production and printing company, Uzhgorod ,, ul, Proektna, 4