SU1288852A1 - Method of controlling output voltage of multichannel pulse converter - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in regulated power supply sources. The aim of the invention is to improve the quality of the output voltage of the pulse converter by improving the spectral if. composition and obtaining linear adjustment characteristics. The purpose of the invention is achieved in that the regulation of the output voltage is carried out by simultaneously changing the duration of the control pulses and their frequency. For this, the control voltage U, distributed over the n channels of the pulse converter, is converted into a pulse sequence in each channel, the pulse frequency of which varies depending on its magnitude of the control voltage U. With the frequency set in such a way, the alternator voltage generator 21 and 26 produce signals and, 21 and and, which are compared with control voltage U at comparators 22 and 27, with and (and.) And 2i 1 k o J at the outputs of which signals U, j and u appear. Thus, along with the change in the pulse frequency, the duration of the pulses also changes. 5 sludge. i cl c

Description

The invention relates to electrical engineering and can be used to create adjustable power sources with modulation of the output voltage and powerful key amplifiers, in cases where high output voltage quality, control speed with the minimum weight and dimensions of the regulators themselves are required.

The purpose of the invention is to improve the quality of the output voltage of the converter by improving the spectral composition and obtaining a linear adjustment characteristic.

FIG. 1 shows a block diagram of a device for implementing the method; in fig. 2 is a functional diagram of a voltage regulator with a higher frequency link implementing the method; in fig. 3 - timing diagrams, explaining the operation of the device that implements the proposed method; in fig. 4 - timing diagrams explaining the essence of the method when changing pulse sequences in three channels of the converter using the example of a linearly increasing input signal; in fig. 5 is a functional diagram of controlled and uncontrollable blocks of the formation of different-polar pulses.

The device (Fig. 1) contains a power source 1, a multichannel pulse converter 2, an adder 3 connected to filter 4, a control circuit including a generator 5, a pulse-width modulator 6.

The regulator (fig. 2) contains n (in this case 3) parallel-switched inverters, each of which is made on fully controlled keys 7.1-7.4, 8.1-8.4 and 9.1-9.4, high-frequency transformers 10-12, the secondary windings of which connected to the inputs of the rectifying bridges 13-15, connected in series and connected to the load via the output filter 16, and the p-channel control unit; each of the channels 17.1-17.3 of the control unit is made in the form of serially connected voltage-frequency converter 18, trigger 19 waiting for multivibrator a 20, the generator 21 of the sweep voltage, the comparator 22, the element And 23, the output of which is connected to the input of the controlled

five

0

five

0

five

0

five

0

five

a unit 24 for generating multipolar pulses, outputs connected to the control inputs of keys 7.1 and

7.3 Inverter cell. A standby multivibrator 25, a sweep voltage generator 26, a comparator 27, an element .A28, an unmanaged unit are also connected in series.

29 forming different-pole pulses, the outputs of which are connected to the control inputs of keys 7.2 and

7.4 inverter cell. Controlled formation block 24

of multipolar pulses (Fig. 5) contains the series-connected element OR 30 and the trigger 31, triggered by a voltage drop from I and O, the direct and inverse outputs of which are connected to power amplifiers containing transformer isolating nodes whose output windings are connected with the control inputs of the corresponding keys of the inverter cells. The device of the uncontrollable unit of forming multi-polar impulses is similar to the device of unit 24, except that the trigger included in unit 29 is tilted not by the falling, but by the rising edge of the input signal, thus the phase of its output voltages with respect to to the phase of the pulses of the master

the generator remains unchanged.

I

The proposed method consists in that the entire range of adjustment of the output voltage in amplitude is divided into zones (Fig. 4, for definiteness, the number of zones accepted is three), generator 5 (Fig. 1), which converts the control voltage and operates with the pulse-width modulator 6 acts on the pulse converter 2 so that it converts the voltage of the source I of the Power, one of its channels, into the pulse sequence U ,, (Fig. 3 or 4), the duration of which pulses and the frequency of their change is functional The dependence on the input signal. By the time t, t, t (Fig. 4), the frequency of the pulse sequence changes from the minimum to the maximum value, the duration of the pulses becomes maximum. The average value of the voltage of this pulse sequence is equal to

unit and does not contain unregulated pauses. From this point on, the voltage is controlled in the next zone.

The voltage at the output of the adder 3 (FIG. 1) is equal to the sum of the voltages of all the sequences.

At the output of the filter 4 Sfig. 1) smoothed voltage of amplified input power is effective

Um.

block 29 of the formation of different pulses of the input trigger for the voltage drop 1 and generates no and - and and no outputs. The diagram on the output of the uncontrollable blanks and amplifiers, acting on the coils of the mopn transformers, is shown in FIG. 3 -. the outputs are connected to the control inputs of the keys of the inverter

Similar to U charts

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five

20

/

U, jg of the voltage, shifting of the pulses and,., And I pulses in block 24. The diagrams of the stresses acting on the transformers of the block 24, by the image of U,.

The joint operation of the torus keys is illustrated by the voltage pattern on the primary winding of the transformer C, FIG. 3). When increased

The device (Fig. 2) works as follows.

The control signal U has a linearly increasing shape, and the converter contains three channels. As a pulse converter, any voltage regulator with a higher frequency link can be used.

The inverters regulate the voltage by varying the pulse duration and their frequency by changing the closing phases of the pairs of key elements 7.1-7.4, 8.1-8.4 and 9.1-9.4 relative to each other. The operation of the converter (Fig. 2) is explained in the diagrams shown (Fig. 3). When appearing

the input control signal Uy of the pre-30 distortion of more than 20K the voltage-frequency generator 18 produces short pulses U, which follow with a repetition frequency varying in proportion to the level of the control signal. Trigger 19 triggers a voltage drop from 0 to 1 from the signals of the converter 18 (and, “Fig. 3), input circuits

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35

nineteen

The pending multivibrators 20 and 25 differentiate the trigger signal 19 (U), 40 and each of the pending multivibrators responds to the input signal of one of the polarities (U.,, Fig. 3). The signals from the multivibrators come

TenbHOCTK pulses multi 20 and 25 controller works with overlap.

Thus, the proposed method allows to increase the flow voltage due to

the channel, with their number more. This is achieved with the exception of cast pulses in the output, in the process of regulating the spectrum of the pulse sequence does not contain distorting r with an amplitude approaching, in addition, these harmonics in the direction of higher frequencies, will almost eliminate

A significant decrease in output voltage allows the design power of the filter

A significant reduction in output voltage distortions makes it possible to reduce the design power of the filters and

The sweep generators 21 and 26, 45 increase the speed, are controlled by the voltage, forming the signals U,, and; j6 (Fig. 3), which are fed to the inputs of the comparators 22 and 27. The control signal U, j acts on the second inputs of the comparators, and the output voltage comparators are represented by diagrams, and U, j7 (Fig. 3). The elements And highlight the signals U and U- while simultaneously acting

29

55

and., and and.

input voltages U and, j, respectively.

The signals u23 U, g are fed to the blocks 24 and 29 of the formation of opposite-polarity pulses. In unmanaged

neither

Claims (1)

Invention Formula 50 A method of adjusting the output voltage of a multichannel pulse converter, which consists in distributing a regulated voltage across n conversion channels. 55 bodies, the regulation of the average value of the voltage is carried out in all channels alternately by changing the duration and frequency of the pulse, and regulation in the next channel. In unit 29 for the generation of bipolar pulses, the input trigger is triggered by a voltage drop of 0 to 1 and generates a voltage at the outputs of both - and and. The voltage diagram at the output of the uncontrolled isolation and amplification unit, acting on the windings of the mopnost transformers, is shown in FIG. 3 -. The output unit 29 is connected to the control inputs of the keys of the inverter cells. U charts 33 and dB AND five 20 U, jg of the voltage, shifted by the duration of the pulses and,., And, are formed in block 24. The voltage diagram acting on the transformer windings of the block 24 is shown by the image U,. The joint operation of the inverter switches 7 is illustrated by the voltage diagram on the primary winding of the high frequency transformer 10 C, Fig. 3). With an increase in the length of 30 distortions by more than 20K 25 35 40 TenbHOCTK pulses of multivibrators 20 and 25 regulator operates in overlap mode. Thus, the proposed method allows to improve the quality of the output voltage by reducing in each channel, with more than three. This is achieved with the exception of unregulated pulses in the output voltage, in the process of regulating the spectrum of the pulse sequence does not contain distorting harmonics with an amplitude approaching the main one, in addition, these harmonics are shifted towards higher frequencies, which makes it almost impossible for them to fall into the filter passband. A significant reduction in output voltage distortions makes it possible to reduce the design power of the filters and 45 to increase the speed of regulation. Invention Formula The method of controlling the output voltage of the multichannel pulse converter, which consists in distributing the adjustable voltage across the n channels of the converter, regulating the average voltage value is carried out in all channels alternately by changing the duration and frequency of the pulse, and the regulation in the next channel starts after reaching the maximum (minimum) voltage value in the previous channel, and the voltages of all the channels are summed up, characterized in that. in order to improve the quality of the output voltage, regulation is carried out in each channel by simultaneously changing the duration of the pulses and their frequency. „ and,  13 n fl n I t, t t, U fig.Z 1ts / vaK ..  in UH.CP. I max 29 Compiled by A. Merkulov. Editor M. Blanar. Tehred L. Serdyukova Proofreader I. Muska Order 7820/55 Circulation 683Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 and € 7 .2 .U FIG. five