SU470893A1 - Direct Current Voltage Converter-Stabilizer - Google Patents

Description

I

The invention relates to the field of electrical engineering, in particular, to stabilized sources of filament.

DC / DC converters-stabilizers are known, which contain a master oscillator, a power amplifier with an output transformer, a rectifier with a filter, and an impulse-pulse modulator designed to comply with the principle of signal comparison.

The purpose of the invention is to improve the quality of stabilization when changing the supply chain.

This is achieved by the fact that a block is connected to the input of the hypothetical pulse modulator, realizing a non-linear function of one non-timed, made, as a node, from a series of parallel branches, each of which consists of successively connected Zener diodes and resistors, the input of which is connected to buses through a Zener diode power and transformer.

FIG. 1 is a block diagram of the proposed DC voltage stabilizer converter; in fig. 2 - electrical circuit in principle; in fig. 3 is a graph of functional distributions.

The converter is not settable, 1, generator 1, pulse-width modulator 2, power amplifier 3 with transformer

input and output, the rectifier n filter 4c inductive input, block 5 of the nonlinear function of one variable, in series with the input of which is included the zener diode 6. The device works as follows.

The generator 1 generates an alternating voltage of a rectangular shape with a frequency of 11, which, at the input of the pulse-width modulator 2, synchronizes the operation of the latter. The rectangular pulses, whose frequency is equal to twice the frequency of the master oscillator, and the duration is determined by the value of the output voltage of the nonlinear function one unit 5, non-linear, from the output of the pulse-width modulator 2 is supplied to the key elements of the power 3, thereby adjusting the duration of the conductive and open states of the latter (see Fig. 3). The average value of the voltage V on the primary winding of the transformer of the amplifier 3 power is defined as:

(I)

and,

-hh-- -y

T

- the duration of the conducting state of the key element; Tn - pernodnnulsov pulse-width modulator;

UH is the supply voltage of the converter.

From the expression (I), it follows that in order to stabilize the average value of the voltage when the voltage varies and the period of the pulses T, is constant, the duration of the conducting state of the key element of the power amplifier T, must be changed according to the following law:

(2)

T - i II -

T |, Un

The duration of the output pulses of the impulse-sided modulator 2, built according to the vertical principle of comparing signals, is determined by the control voltage, therefore, to realize equality (2), the control voltage of the pulse-width modulator varies according to a certain law when the voltage of the voltage B, b task limits. The required law of control imbalance is formed by block 5 of the nonlinear function of one variable.

The power supply voltage AND "is supplied to the block 5 of the nonlinear function of one variable through the Zener diode 6 in series with it, the nominal stabilization voltage of which is U (.p. The necessity of such a Zener diode G is due to the fact that Iri and U, U (. p ratio T „

he owed the ravio one and iri

| 1

growth and

otioshenie

traces

for sure, the duration of T "must be reduced, since T" is constant. From this it follows that the control plex of the control of the width of the pulse of a pulse modulator should appear at the output of the block 5 of a nonlinear function of one of the other only iri C, Ucp

Thus, when the supply voltage changes in a given range, the average voltage U

on primary tomotka

wed

the transformer of the power amplifier 3 is almost unchanged, and, consequently, the voltage across the load connected to the output of the filter 4 also does not change.

NOTICE of invention

A direct current voltage regulator-converter containing a master oscillator, an amplifier with an output transformer, a rectifier with a filter and an I1, and a mouth-and-pulse modulator that is perfectly compatible with vertical signals. stabilization of the voltage variation of the power supply, to the input of the rotary rotary modulator is connected 6: TK, realizing a non-linear function by one hiemeria, fulfilled for example, for example, a node form from a number of parallel branches, each of which It consists of successively connected Zener diodes and resistors, the input of which through the Zener diode is connected to the power supply buses of the converter.

rHW

Load

.-4AJ &,

F1 / G2