SU1430905A1 - Discrete phase-controlling device - Google Patents

Abstract

The invention can be used to reproduce a predetermined phase shift angle when certifying phase-measuring equipment. The purpose of the invention is to expand the range of reproducible phase shift angles and decrease the discrete value of the specified phase shift. A discrete phase setting device containing an impulse generator 1, a discrete phase shifter 2 on frequency dividers, a switch 3, a shaper 6 of a person with a voltage source, a comparator 7 and a constant voltage source 9 are introduced in the second channel divider 8 voltage With the help of the introduced elements, small phase shifts are additionally formed, which are summable with the phase shifts of the discrete phase shifter 2. Thereby, the discreteness of the specified phase shift is reduced. There are also shapers of 3 and 4 sinusoidal voltages and. 2 Il. . (L

Description

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The invention relates to a phase-measuring technique and can be used to reproduce a unit of a phase shift angle between two. m sine-pumping voltage and for certification of highly sensitive phase-measuring equipment.

The purpose of the invention is to expand the functionality by expanding the range of reproducible phase shift angles, reducing the magnitude of the discrete setting of the phase shift.

Fig, 1 shows a block diagram of a discrete phase-difference device; Fig 2 is a temporary diag-r frame of operation of the device.

The discrete phase-forwarding device contains a pulse generator 1, a bottom-controlled controlled phase shifter 2 on frequency dividers, two shaper 3 and 4 sinusoidal voltages, the first of which is connected to the first output of the discrete phase shaper 2, connected in series with the switch 5, shaper 6 is linearly changed low voltage and voltage comparator 7, a discrete divider 8 constant voltage connected to the output of the source 9 constant voltage, while the second output discrete controlled phase shifter 2 is connected to the first input of the switch 5, the second input of which is connected to the output of the ShO1 pulse generator 1 and the input of the phase shifter 2, the input of the second shaper 4 of sinusoidal voltage is connected to the voltage comparator 7 input, the second input of which is connected to the output of the splitter 8 constant voltage wives

The device works as follows.

The pulse signal from the pulse generator 1 (Fig. 2a) is simultaneously fed to the input of the discrete phase shifter 2 and to one of the inputs of the switch 5. The discrete phase shifter 2 on the frequency dividers reproduces the phase: shifts in the range 0-360 with a discreteness of l f by changing the time the position of the pulses within a period ranging from 0 to T with a discreteness of 4T. The phase shift at the output of the phase shifter 2 is determined by the expression (FIG. 25, c).

. 360 2 | 1,

(one )

where T is the pulse following period at the output of the discrete phase shifter 2;

n is the number of discrete steps specified in the discrete phase shifter 2 {

m is the maximum value of the number „n, corresponding to 0 (its 360,

LT period of the pulse

at the input of the discrete phase shifter 2,

At the output of the switch 5, a sequence of pulses of duration is formed (Fig. 2d). The time shift of the leading edge of the pulse corresponds to the value of the phase increment tf given by discrete phase shifter 2 on the frequency dividers.

The pulses arrive at the input of the former 6, where they are converted into linearly varying voltage (Fig. 2e). Moreover, the zero voltage corresponds to the leading edge of the specified pulse, and the voltage corresponds to the falling front of this pulse. A linearly varying voltage is applied to one of the inputs of the comparator 7, the second input of which receives a constant voltage from a source of 9 constant voltage through a divider 8, using a divider 8, which is graduated in degrees, phase constant O from to. A comparator of 7 voltages at the points of equality of a linearly varying and constant voltage generates a short pulse (fig, 2d, e) 5 fop fflpy, thus, an additional phase shift of the signal.

Additional phase shift u (f is in the range from O to u (f

th (

360 CL And

(2)

where L uT / i;

i is the maximum number of discrete junctions reproduced by DC divider 8;

K is the number of selected discrete steps by a divider of 8 constant voltage.

In this case, the total phase shift between the pulsed signals at the inputs of the formers 3 and 4 of the sinusoidal signals and, accordingly, between the sinusoidal signals at their outputs is defined as

t /, na (f + ai.

(3)

Substituting the values of 4 s / 4 and producing the conversion, we obtain

with ,,. |,. (.)

Thus, a reduction in the magnitude of the discrete value of the phase shift angle is provided, and the expansion of the specified angles in the region of small phase shift angles.

The magnitude of the minimum sampling value is determined by the achievable voltage-to-voltage conversion accuracy.

Since the device realizes the discreteness of setting the phase angle in the range of t / 0.001 - 360 values, it can be used not only as a phase calibrator, but also for qualifying null phase indicators.

Formula of Invention

Discrete phase deflection device containing a pulse generator,

connected to the input of a discrete controlled phase shifter on frequency dividers, two sinusoidal voltage drivers, one of which is connected to the first output of a discrete controlled phase shifter on frequency dividers, in order to expand the range of reproducible phase shift angles and decrease the sampling phase shift, a switch connected in series, a linear variable voltage driver and a voltage comparator, as well as the source a constant voltage output connected to an input discrete voltage divider, the second output of the discrete controlled phase shifter on the frequency dividers connected to the first input of the switch, the second input of which is connected to the output of the pulse generator, the second input

A sinusoidal voltage driver is connected to the output of a voltage comparator, the second input of which is connected to the output of a discrete constant-voltage divider.

Claims (1)

Claim A discrete phase-setting device containing a pulse generator connected to the input of a discrete controlled phase shifter on frequency dividers, two sinusoidal voltage drivers, one of which is connected to the first output of a discrete controlled phase shifter on frequency dividers, characterized in that, in order to expand the range of 10 by reproducible phase angles the shift and decrease the discrete of the specified phase shift, it is additionally introduced in series connected switch, shaper linearly a varying voltage and a voltage comparator, as well as a constant voltage source, connected to an input discrete voltage divider, the second output 2θ of a discrete controlled phase shifter on frequency dividers connected to the first input of the switch, the second input of which is connected to the output of the pulse generator, the input of the second 25 sine voltage is connected to the output of the voltage comparator, the second input of which is connected to the output of a discrete DC voltage divider.