SU1398057A1 - Stabilizing voltage converter with phase control - Google Patents

Abstract

The invention relates to electrical engineering. The goal is to increase efficiency. The device contains a master 1 and a slave 2 autogenerators connected in parallel to the input buses, in which the secondary windings 21, 22 are connected in series, the master autogenerator 1 having an additional winding 23 controlling the switching times of the transistors 5, 6 of the slave autogenerator 2 autogenerator 2 with respect to the shift of the leading autogenerator 1 is set by transformer 26. As soon as transistor 6 begins to open, through its base-emitter junction voltage of the winding and 23 is applied across the input relative to the transistor in the locking polarity, which leads to its forced locking. 2 Il. O) with

Description

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The invention relates to electrical engineering and can be used in secondary power supply and electric drive systems for converting a constant voltage to a PWM stabilized alternating voltage.

GLEL invention - increased efficiency,

Fig. 1 shows a schematic electrical diagram of Fig. 2 — voltage diagrams that explain its operation, Uj being the voltage of the base-emitter junction of the corresponding transistor, and voltage across the collector of the corresponding transistor; control voltage control of a transistor.

The stabilizing converter (Fig. 1) contains a master 1 and a slave: 2 oscillators. Each oscillator consists of two transistors 3-6, with collectors connected to the terminals of the primary windings 7 and 8 of transformers 9 and 10, having midpoints connected to the positive terminal of the power supply 11. The emitters of the transistors are connected to the negative terminal of the power supply 12 and, through resistors 13-16, to the first terminals of the control windings 17-20, the second terminals of which are connected to the bases of transistors 3-6. The secondary windings 21 and 22 of transformers are connected in series and connected to the output terminals of the converter. The master oscillator has an additional winding 23, one output of which is connected to the base of the first transistor 5 of the slave oscillator 2. The control transistor 24 is connected to the output of the rectifying bridge 25. The phase shifting transformer 26 is connected to the base of the second transistor 6 of the slave autogenerator 2, and the second output is with the second output of the additional winding 23. The secondary winding 28 of the phase-shifting transformer 26 is connected to the input of the rectifying bridge.

The converter works as follows.

Suppose that the transistor 3 is open in its initial state. Transistor 4 is closed and held in the closed state by the voltage of the winding 18. Transistor 5 is opened by the voltage of

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five

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five

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coil 19 and 23, and transistor 6 is locked by the voltage of windings 20 and 23.

When the transformer 9 is saturated, the transistors 3 and 4 switch over. The polarity of the voltage on the winding 23 is reversed. A voltage of unlocking polarity U is applied to the base of the closed transistor 6 through the primary winding 27 of the phase-shifting transformer. Since at the first moment the inductive resistance is large, the magnitude of the applied voltage is determined by a divider consisting of the active resistance of the transistor 24 introduced into the primary winding from the secondary and the resistance of the resistor 16.

The parameters of the elements are chosen so that this voltage does not open the locked transistor. Subsequently, as the voltage on the inductance winding 27 decreases from a predetermined time constant, the voltage at the base of transistor 6 increases and the process of unlocking transistor 6 begins. Thus, the time of unlocking transistor 6 (Fig. 2) depends on the resistance value of the collector-emitter section transistor 24.

As soon as the transistor starts to open, through its base-emitter junction, the voltage of the winding 23 is applied to the base-emitter section of the open transistor 5 in the locking polarity, which results in its shaped locking (Fig. 2, i).

Then, when the magnetic core of the transformer 9 is saturated, the process repeats. Simultaneous forced unlocking of one transistor and locking the other transistor of the slave oscillator increases efficiency.

Claims (1)

Invention Formula A phase-controlled stabilizing voltage converter containing a master and a slave oscillators, each of which consists of two transistors, collectors connected to the terminals of the transformer primary winding having a midpoint connected to the first input terminal of the converter, and emitters connected to the second converter input terminal and through resistors - with the first terminals of the control windings, the second terminals of which are connected to the bases of the transistors, and the secondary windings of the transformers vtogeneratorov connected in series, and the master oscillator has a secondary winding, a first terminal of which is connected to the base of a first transistor driven oscillator, the control transistor off on vghode bridge rectifying unit of m- lichayuschiys that, with tse After the increase in efficiency, a phase-shifting transformer is introduced, the first output of the primary winding of which is connected to the base of the second transistor of the slave auto-generator, the second output with the second output of the additional winding, and the secondary winding of the phase-shifting transformer is connected to the rectifier bridge. FIG. 2