SU1285562A1 - Phase shifting device - Google Patents

Abstract

Invention m. Used in devices where an adjustable phase shift from 0 to 180 is required. The purpose of the invention is to improve the accuracy of the phase shift setting. The device contains a controlled phase link 1, a pulse-width modulator 2, a comparison unit 5. A voltage regulator source 6, a static regulator 4, a sampling-storage unit 3, a pulse shaper 7 are newly introduced. 2 Il. 2 (L L. to 00 sd about about: to

Description

The invention relates to radio engineering and can be used in devices where an adjustable phase shift from 0 to 180 is necessary.

The purpose of the invention is to improve the accuracy of the phase shift setting.

FIG. 1 shows the structural electrical circuit of the proposed device; in fig. 2 - timing diagrams explaining the operation of the device.

Phase shifting device contains controlled phase element 1, pulse-width modulator 2, block

of torus 4 for a time equal to the period of follow-up of the pulses of the pulse former 7 (Fig. 2. The output signal of the sampling-storage unit 3 (Fig. enters the input of the pulse-width modulator 2, which produces control pulses arriving at the control pulse The control input of the phase link I. The control pulses of the pulse-width modulator 2 are a sequence of pulses, the relative duration of which is proportional to the amplitude of the output signal of the block 3 sample 20

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3 sampling-storage, static storage re-) 5 (Fig. 2) and equal to tt, / T humor 4, comparison unit 5, voltage regulating source 6 and pulse shaper 7.

Phase-shifting device operates as follows.

The input and and output and 2 signals of the controlled phase link 1 (Fig. 2a) are fed to the corresponding inputs of cp-5 unit 5, the output signal of which is a sequence of pulses whose duration is equal to the phase shift between the signals U and U2,. (Fig. 26) is supplied to the control input of the static regulator 4. The signal input of the static controller 4 receives the voltage from the source 6 of the regulating voltage (Fig. 26). The static controller 4 sums the input signals, producing an error signal (Fig. 2d), and integrating the error signal, converts it (Fig. 2b). In the steady state, the error signal is zero, since the areas S and Sg, bounded by 40 positive and negative pulses, are equal (Fig. 2 g), which ensures a high accuracy of maintaining the phase shift between

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Uj, are impulsively controlled. the conductivity of the controlled phase link 1, which is a series connection of a resistor R and a key controlled by the output pulses of a pulse width modulator 2. The average conductivity value for the period of the control pulses of a pulse width modulator 2 g Y / Rj Phase shift created by the controlled phase even 1 and therefore the phase shifter, is determined by

4 -2arctgu) Rg.C / y -2arctg iR C / Uy, where Rj is the resistance of the resistor R of the controlled phase link 1;

С - capacitance of the controlled phase link 1.

If the value of the time constant, C of the controlled phase-link 1 is chosen such that at 3 phase shifts H 0-, then, change the amplitude of the output signal of the sampling-storage unit 3 by adjusting the voltage of the regulating voltage source 6 , it is possible to adjust the phase shift of the output signal of the phase shifter in the range of 0-180 °.

and Ug of the controlled phase link 1. The magnitude of the phase shift is determined by the amplitude of the voltage of the source 6 of the regulating voltage.

The output signal of the static controller 4 (Fig. 2E) is fed to the input of the sampling-storage unit 3, to the control input of which pulses are received (Fig. 2e) from the pulse former 7, which generates pulses at the moments of zero crossing of the output signal of the controlled phase link 1. Sample storage unit 3 measures and remembers the amplitude of the output signal of the static controller 4 for a time equal to the period of a pulse of the pulse generator 7 pulses (Fig. 2. Sample storage unit 3 output signal (Fig., enters input latitude and Pulse modulator 2, which produces control pulses arriving at the control input of the controlled phase link I. Control pulses of pulse-width modulator 2 are a sequence of pulses, the relative duration of which is proportional to the amplitude of the output signal of sample 3

storage (Fig. 2) and is equal to tt, / t

Uj, are impulsively controlled. the conductivity of the controlled phase link 1, which is a series connection of a resistor R and a key controlled by the output pulses of a pulse width modulator 2. The average value of conductivity for the period of the control pulses of a pulse width modulator 2 g Y / Rj Phase shift created by the controlled phase even 1 and therefore the phase shifter, is determined by

4 -2arctgu) Rg.C / y -2arctg iR C / Uy, where Rj is the resistance of the resistor R of the controlled phase link 1;

С - capacitance of the controlled phase link 1.

If the value of the time constant, C, of the controlled phase-link 1 is chosen such that at 3 the phase shift is H 0-, then by changing the amplitude of the output signal of the sampling-storage unit 3 by adjusting the voltage of the regulating voltage source 6 adjust the phase shift of the output signal of the phase shifter in the range of 0-180 °.

A change in the phase shift between the input and output signals of the controlled phase link 1 leads to a change in the width of the pulses at the output of the comparison unit 5, which leads to a change in the signal at the output of the as- static regulator 4 and, therefore, at the output of the sample-storage unit 3 in accordance with the new value of the signal of the static regulator 4. The signal of the sample-storage unit 3

modifies the duty cycle of pulse-width pulses of top 2, affecting the control input of the controlled phase link 1, resulting in a change in the average value of conductivity and constant-time controlled phase link 1, which compensates for changes in the phase the shift between the input and output signals of the controlled phase link 1. After testing the change in the phase shift, the output signals of the static controller 4, the sample-storage block-3 and the width-1Spulse modulator 2 are set to and a similar position on the original levels, i.e. take the established values. This happens in the proposed phase-shifter to eliminate the change in phase shift, thereby increasing the accuracy of setting the phase shift.

Claims (1)

 The invention Phase-shifting device containing a controlled phase element, the input and output of which are the input and output of the phase-shifting device and connected to the corresponding inputs of the comparator unit, a pulse-width modulator, the output of which is connected to the control input of the phase link, characterized by that, in order to improve the accuracy of the phase shift installation, a series-connected regulating voltage source, an static regulator and a sampling-storage unit, the output of which is connected to the input a pulse-width modulator, as well as a pulse shaper, connected between the output of the controlled phase-Bojro link and the control input of the sampling-storage unit, while the output of the comparison unit is connected to the control input of the static regulator. 3 1PPPPPPPPPPP, fa Ag.2 Compiled by Yu. Igedvedev A. Shishkina Tehred M.Hodanich Corrector Proofreader M. Maksimishinets