SU1356157A1 - Device for controlling voltage converter with multizone modulation - Google Patents

Abstract

This invention relates to electrical engineering and can be used in converters of direct voltage to alternating voltage. The purpose of the invention is to expand the range of reproducible frequencies and reduce nonlinear distortion. The modulator key control algorithm allows an increase in the ripple frequency of the MELT voltage in relation to the half-cycle of the clock frequency. This increases the range of reproducible frequencies and decreases the nonlinear distortion factor. The effect of noise on the control circuit is reduced by increasing the amplitude of the linearly varying voltage, 1 hp. f-ly, 2 ill. (L with co

Description

11356157

The invention relates to electrical engineering, in particular, to a converter for voltage-to-voltage transducer, and can be used in power supply systems for communications equipment, amplitude modulators, and low-frequency amplifiers.

The purpose of the invention is to expand the range of reproducible frequencies and 10 reduce nonlinear distortion.

FIG. 1 shows a block diagram of the device; in fig. 2 - time diagrams of voltages, which are used to work the device. 15

Consider the operation of a voltage transducer with multi-band modulation with two modulation cells.

A multiband modulation voltage converter contains modulation cells 1 and 2 with matching transformers 3 and 4, the secondary windings of which are connected in series and intended to be connected via a demodulator 5 and filter 6 25 to a load 7, master oscillator 8 and p phase-controlled nodes 9 and 10, the outputs of which are connected to the control inputs of modulation cells i and 2, the input of the n-phase driver 1 1 to them --- the HZ pulses are connected to the master oscillator 8, and the outputs respectively to the first inputs of phase-regulating nodes 9 and 10, sec the inputs of which are combined and are the control input 12 of the converter, where the master oscillator 8 is connected via a frequency divider 13 to the third inputs of the phase-adjusting nodes 9 and 10 and the other inputs of the modulation cells 1 and 2; p-phase-up shaper 1 1 pulses contains a shift register 14 and logic elements 15 and 16 e first inputs

which are combined with the input of the shift register 4 and are the input of the p-phase-45

pulse shaper, and the latter are connected to the corresponding outputs of the shift register 4, and

the outputs of logic elements and 15 and

16 are the outputs of the p-phase pulse former; Each phase control unit 9 and 10 is made of series-connected generators 17 and 18 of linearly varying voltage, comparators 19 and 20, and

of the logic element EXCLUDE, CEE-IL 21 and 22, the first inputs of the phase-regulating nodes Z1 and 22 being the synchronization inputs of the generators

17 and 18, the linearly varying voltage and the second inputs are the second inputs of the comparators 19 and 20, and the third inputs are the second inputs of the EXCLUSIVE OR logic elements 21 and 22, the outputs of which are the outputs of the phase-controlled nodes.

FIG. 2 denotes: 23 — voltage of the master oscillator 8; 24 and 25 is the voltage at the output of the shift register 14; 26 and 27 - voltage at the outputs of logic gates And 15 and 16; 28 - voltage at the output of the frequency divider 13; 29, 30 - voltage at the outputs of generators I7 and 18 linearly varying voltage; 31 - voltage at control input 12; 32 and 33 - the voltage at the outputs of the comparators 19 and 20; 34 and 35 - voltage at the outputs of phase-reverse units 21 to 22 36 and 37 - voltage on the secondary windings of power transformers 3 and 4; 38 - voltage at the input of the demodulator 5; 39 - the voltage at the input of the filter 6.

A multiband modulation voltage converter operates as follows.

The master oscillator 8 generates a voltage 23, which is fed to the input of the register 4. shift 1, at the outputs of which voltage 24 and 25 appear, arriving at the inputs of logic gates And 15 and 16. The other inputs of the logic gates And comes with a voltage of 23 s of the master oscillator 8, as a result, the voltages 26 and 27 are set at the outputs of these elements. With this voltage, the generators of the linear voltage 17 and 18 are started. As a result of the comparison of the linearly varying voltages 29 and 30 with the constant signal 31 coming from manager stroke 12 at the outputs of the comparators 19 and 20, voltages 32 and 33 arrive at the inputs of the EXCLUSIVE OR phase-regulating units 21 and 22. The second inputs of these elements receive a voltage 28 from the frequency divider 13, and the voltages are set at the outputs 34 and 35. The first inputs of the modulation cells 1 and 2 receive voltages 34 and 35 ,. and on the second - voltage 28 from the output of the divider 13 frequency. The frequency divider is based on a counter. On the secondary windings of transformers 3 and

313

4, voltages 36 and 37 are generated, which are added up and voltage 38 is set at the input of demodulator 5, and voltage 39 is output at the output of filter 6. Voltage at the secondary windings of transformers 3 and 4 is formed according to the law of pulse-width modulus of In addition, at any moment in time they have the same sign, which allows them to be summed up at the input of the demodulator 5. At the same time, the output of the demodulator 5 produces a voltage 39, which is controlled by using the multi-zone pulse modulation method, and the number of control zones is equal to the number of phases.

Thus, the proposed device allows, in comparison with the known, to increase the frequency of the ripple of the output voltage 39 with respect to the half-cycle of the clock frequency (voltage 28). This increases the range of reproducible frequencies and decreases the nonlinear distortion factor.

Claims (2)

Claim 1. A device for controlling a voltage converter with multi-zone modulation, comprising 5 modulation cells with two control inputs and matching output transformers, the secondary windings of which are connected in series and connected through a demodulator and a filter to the load, containing master oscillator and phase shift  h E L GB b 27 21 II 2S JiTxt 3} 7 4 nodes, each phase regulating node includes a linearly varying voltage generator and a comparator connected in series, characterized in that, in order to expand the range of reproducible frequencies and reduce nonlinear distortion, it is equipped with a frequency divider, n EXCLUSIVE OR, in each phase regulating node and p-phase pulse shaper connected by the input to the output of the master oscillator, and the outputs to the synchronization inputs of the generators of a linearly varying voltage, the frequency divider input The ohm is connected to the output of the master oscillator, the output of the frequency divider is connected to the first inputs of the EXCLUSIVE OR elements and is intended to be connected to the first control input of the modulation voltage. In this case, the second inputs of the EXCLUSIVE OR elements are connected to the output of the comparator of the corresponding phase-regulating node, and the outputs are intended for connection to the second control inputs of the modulation cells. 2. A device according to claim 1, characterized in that the p-phase pulse former; contains the shift register and logic elements And, the first inputs of which are combined with the input of the shift register and form the input of the n-phase driver w. {- pulses, the second inputs are connected to the corresponding outputs of the register -. shift, and the outputs form the outputs of the n-phase pulse former. Jl With “