SU1408510A1 - Single-phase device for controlling m-phase static converter - Google Patents

Abstract

The invention relates to converter equipment and can be used in multi-phase inverters. The purpose of the invention is reliability. The device contains two phase splitters 1 and 2, connected via matching elements 12 to the inverter. The phase shifter unit 3 is connected to the inputs of the phase splitter 2 through a pulse frequency converter B and a synchronization unit 9, the introduction of which provides a one-to-one relationship between the control voltage and the duration of the output pulses. 2 Il.

Description

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The invention relates to a converter technique and can be used in multi-phase inverters with pulse-width control. The purpose of the invention is to increase reliability by introducing an unambiguous relationship between the control voltage and the output voltage of the pulses.

Figure 1 presents the block diagram of the device; FIG. 2 shows diagrams explaining its operation (for the case of a 3-phase converter);

The device contains two phase-separation devices 1 and 2 assembled according to a recalculation scheme, each of which forms at its m outputs pulse sequences with an output voltage frequency of tl / 2fg, phase shifting unit 3, including a sawtooth voltage generator 4 and element 5 Comparison driver 6 sync pulses

a pulse generator 7, a conversion unit 25 of a match 10, to another input of a pulse frequency generation performed in the generator circuit 8, a synchronization unit 9 consisting of a match element 10 and a frequency divider 11, m two-input match I2 elements,

The device works as follows.

The generator 7 outputs to the input of the recalculated phase splitter i a sequence of rectangular pulses with a frequency and duration t l / 2fp (Fig. 2a). The phase splitter 1 forms at its outputs from this pulse sequence a series of m sequences with a frequency fg, duration t l / 2fj, shifted in phase by a fixed angle H. relative to each other

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a sequence of pulses from the output of the phase shifter is given (Fig. 2k). The resulting sequence of pulses is fed to the input of the setup in frequency divider 11. The counting input of the divider receives pulses from the output of the phase-shifting unit 3. At the output of the divider 11, a pulse sequence is formed (Fig. 2i) arriving at the input of the phase splitter 1 to the phases of the phase splitter 2,

The pulses from the outputs of both phase-to-4Q splitters arrive at the inputs of the coincidence elements 12, the outputs of which form m sequences of pulses that are shifted relative to each other by the angle tf 2 / r / m, s

(Fig.26, c, d). One of m is formed by j duration, depending on the voltage sequences (fig.26) of the control name (fig.2n, o, n). pulses are used to form a second series with 5,, t-l / 2fg and an angle of control d 0 180 degrees, i.e. with the same parameters as the first series, but shifted by the angle of control oC (Fig. 2k, l, m).

. The formation of this series is as follows. The aylo-voltage generator 4 is synchronized by the shaper 6 at a frequency of 2f.

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(Fig.2d). From the output of the generator 4, the voltage of the yiloid shape (Fig. 2e)

The proposed single-channel device for controlling a t-phase static converter provides an unambiguous dependence of the duration of the output igots on the reference voltage when the control angle is changed from 0 to 180 electr. This new quality of the device allows it to be used to control the g-phase static converters; pulse width modulation developers.

enters the comparison circuit 5, where it is compared with the control voltage Uy. At the moment of equality of these voltages (point K in FIG. 2e), the output of the comparison circuit 5 produces pulses with a frequency of 2fg and an offset angle of about 0-180 el. ., depending on the value of U, (Fig, 2i). These pulses synchronize the operation of the generator of 8 pulses, which generates, at a frequency f (, (FIG. 2h), a series of pulses arriving at the counting input of the phase-splitter 2, which is an open-loop scaling circuit

A sync pulse with a frequency fj of duration tl / 2fg and phase-shifted by an angle o (el. Hail (Fig. 2k)) is delivered to the free input. The sequence of pulses from the output of the phase splitter 1 (Fig. 26) served on the first input of the circuit

a sequence of pulses from the output of the phase shifter is given (Fig. 2k). The resulting sequence of pulses is fed to the input of the setup in frequency divider 11. The counting input of the divider receives pulses from the output of the phase-shifting unit 3. At the output of the divider 11, a pulse sequence is formed (Fig. 2i) arriving at the input of the phase splitter 1 to the phases of the phase splitter 2,

duration depending on the control voltage (fig.2n, o, n).

The proposed single-channel device for controlling a t-phase static converter provides an unambiguous dependence of the duration of the output igots on the reference voltage when the control angle is changed from 0 to 180 electr. This new quality of the device allows it to be used to control the g-phase static converters; pulse width modulation developers.

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Formula of invention

A single-channel device for controlling a phase static converter, comprising a first pulse generator, a first and second phase splitters, a clock generator, a phase shifter, m two-input matching elements, a pulse frequency conversion unit, the first phase splitter connected to the output of the first pulse generator, outputs - to the first inputs of two-input elements of coincidence, the sync pulse generator is connected by an input to one of the outputs of the first phase splitter, the output to phase shifting unit, pulse frequency conversion unit

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connected between the output of the phase-shifting unit and the counting input of the second phase splitter, the outputs connected to the second inputs of the two-input coincidence elements, so that, in order to improve the reliability of the device, it is equipped with a syncro1Mization unit, consisting of a coincidence element and a frequency divider, the first input of the coincidence element is connected to the input of the sync pulse generator, with the second input - to the output of the phase locking b block, and the output to the installation input of 1 frequency divider, the counting input of which is li ne to the output of the phase shifter unit, an output of the divider is connected to the input of the second fazorasschepitel.

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Claims (1)

Claim A single-channel device for controlling an m-phase static converter containing a first pulse generator, first and second phase splitters, a clock driver, a phase shifting unit, m two-input matching elements, a pulse frequency conversion unit, the first phase splitter being connected to the output of the first pulse generator by the outputs to the first inputs of two-input elements! coincidence, the generator of clock pulses is connected by an input to one of the outputs of the first phaeo splitter, by an output - to a phase-shifting unit, a pulse frequency conversion unit 1408510 ^{4 is} connected between the output of the phase-shifting unit and the counting input of the second phaeo splitter, the outputs connected to the second inputs of the two-input matching elements, characterized in that, in order to increase the reliability of the device, it is equipped with a synchronization unit, Ιθ consisting of a matching element and a frequency divider, the first the input of the coincidence element is connected to the input of the generator of clock pulses, the second input to the output of the phase shifter jg Щ4гъ of the block, and the output to the input of setting 1 frequency divider, the counting input of which is connected chen phase shift to the output unit, the divider output being connected to the input of the second fazo'rasschepitelya. ΊΠΠΠΠΠΠΠΠΠΠ t ΖΊ-ΕΖ ΞΞΣ1 t 1 ---------------------------1 g ^- ..... 1 t ΣΧ .. G .............. 1 r ~ t 1 n n  P t to ~ x_- to__ : ί P P L P t P P p p p p p l L P L t :P w t G .............1 I -------------------- 1 t Ί eleven g t eleven 1 t G ” Ί G ...... Ί t G ............. 1 G 1 t ~ 1 G - | t Fig. G