RU2559692C2 - Three-channel shaper of voltages with phase shift - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and is intended for use in phase shifting circuits to obtain symmetric three-phase voltage. The device contains three frequency dividers connected to the generator of periodic pulses of voltage, each of which contains a row of series connected, identical triggers having direct and inverse outputs, in one of frequency dividers the triggers are connected to each other by direct outputs, and in two other frequency dividers the triggers are alternately connected with each other by direct and inverse outputs, in one - from the direct output, in another - from the inverse output.

EFFECT: technical result is the device simplification.

1 dwg, 1 tbl

Description

The invention relates to radio engineering and is intended for use in general purpose electronic circuits, in particular in phase-shifting circuits.

Known three-channel phase splitter on.with. No. 366546, in which the input signal is branched using a splitter into three channels. In one of the channels, the phase of the signal using the first phase shifter is rotated by an angle close to 120 °. In another channel, the phase of the signal using the second phase shifter is rotated by an angle close to 240 °. Then, the signals of the three channels are summed and amplified through amplifiers with AGCs on the condition that the amplitudes and phases of the output voltages are equal. The disadvantage of a three-channel phase splitter as. No. 366546 is the design complexity due to the presence of an adder and amplifiers with AGC amplification.

A simpler design has a device for splitting the harmonic voltage into two equal voltages with a 90 ° phase shift in AS No. 352367 with a phase inverter, characterized in that, in order to maintain a constant phase shift, the input voltage to the phase inverter is supplied through a frequency multiplier, and frequency dividers with a division coefficient equal to the frequency multiplier are connected to the outputs of the phase inverter.

The disadvantage of the device as. No. 352367 is the lack of the ability to obtain a symmetrical 3-phase voltage.

Device by A.S. No. 352367 is taken as a prototype of the invention.

The aim of the invention is to obtain 3 voltages with a phase shift.

The goal is achieved in the proposed three-channel device for generating voltage with a phase shift, containing, similarly to the prototype, three frequency dividers connected to a generator of periodic voltage pulses, each of which contains a series of series-connected, identical triggers having direct and inverse outputs. The proposed device differs from the prototype in that in one of the frequency dividers the triggers are connected to each other by direct outputs, and in two other frequency dividers the triggers are alternately connected to each other by direct and inverse outputs, in one - starting from the direct output, in the other - starting from inverse output. In particular, when connecting with the same outputs, it is possible to connect triggers with direct or inverse outputs. To obtain a symmetric three-phase voltage, for a given accuracy of the equality of the phase shift of the output voltages, the same number of triggers are connected in the dividers.

In FIG. 1 shows a diagram of the proposed device.

In FIG. 1 are marked: A, B, C - respectively the first, second and third frequency dividers; Tg, 1, 2, ... n-1, n - triggers the frequency divider. The generator of periodic pulses of electric voltage in FIG. 1 is not shown.

The operation of the proposed device is as follows.

The trigger of the frequency divider doubles the period of the sequence of periodic pulses, and the inversion of the output signal on the trigger is equivalent to a phase shift of the phase inverter by 180 °. In the subsequent frequency division without inverting the output signal, the obtained phase shift at the first trigger due to the increase in the period of the output voltage oscillation decreases, for (n) triggers by (2 ^ n) times, i.e. 180 ° / (2 ^ n). The total shift on all triggers of the frequency divider depends on the number and connection of triggers in the divider. The dependence of the phase shift of the voltages at the output of the proposed device on the number (n) of triggers in the frequency divider is shown in table 1. The results shown in table 1 show that with an increase in the number (n) of triggers in the frequency divider, the accuracy of the phase shift equality increases. As the number of triggers in the divider increases, the phase shift between the output voltages approaches 120 °.

Thus, the alternation of the direct and inverse outputs of the trigger in the connection of the triggers in the frequency dividers of the proposed device allows to obtain various fixed phase shifts of the output voltages and, in particular, when the number of triggers in the dividers is increased and equal, it allows to obtain a symmetrical three-phase voltage for practical purposes.

Claims (1)

A three-channel phase-shift voltage generating device comprising three frequency dividers connected to a generator of periodic pulses of electrical voltage, each of which contains a series of sequentially connected, identical triggers having direct and inverse outputs, characterized in that the triggers are connected to one of the frequency dividers other direct outputs, and in two other frequency dividers the triggers are alternately connected to each other by direct and inverse outputs, in one - starting from a direct output, in dr by God - from the inverted output.