SU1647808A1 - Ac-to-dc voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used as a highly accurate power source. The purpose of the invention is to reduce weight and size parameters. The equalization reactor is designed as three-winding inductive dividers 5-7, the windings of which are connected between the respective phases of the secondary windings 3, 4 of the transformer and semiconductor devices 8-13, so that a triangular voltage is formed on the windings of the dividers and the phase currents are separated by the flow of currents Common phase windings through the windings of dividers 5-7, allows to significantly reduce the amount of current through the windings of dividers. 2 il, -y

Description

ABOUT

four.

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with

The invention relates to electrical technology K8 and can be used in low-voltage and high-current converters, in particular, for the supply of electroplating baths,

The purpose of the invention is to reduce the mass-size parameters of the converter,

FIG. 1 is a circuit diagram of a converter; FIG. 2, diagrams of phase currents (la, ib, ic) and voltages on the corresponding elements, characterizing its operation.

The converter contains a transformer 1 with primary winding 2 and secondary windings 3 and 4, three-winding inductive dividers 5-7, semiconductor devices (thyristors) 8-13 and output pins 14 and 15. The ends of the primary winding of transformer 1 are connected in a star (delta) and form converter input terminals, secondary windings 3 and 4 of transformer 1 are connected to forward and reverse stars and connected to three-winding inductive dividers 5–7, with the end of the winding of the AZ phase connected to the end of the second winding of the inductive divider 5, Inline with the second winding of the divider 6, the end of the LZ - to the end of the second winding of the divider 7 connected in series with the first winding of the divider 5, phase C3 - to the end of the first winding of the divider 6 connected in series with the first winding of the divider 7, and the free outputs of these windings are connected to the anodes (cathodes) of semiconductor devices 8, 11 and 12. The beginnings of the windings of the a4, b4, c4 phases of the second secondary winding are connected respectively to the beginnings of the third windings of inductive dividers 5-7, the ends of which are connected to the anodes (cathodes) of the semiconductor postglacial devices 9, 10 and 13. The anodes (cathodes) semiconductor devices are combined to form a second output transducer 15 vypod.

The Converter operates as follows.

When an alternating voltage is applied to the converter input, the secondary windings 3 and 4 of transformer 1 form a direct and inverse system of three-phase secondary voltages (Fig. 2a). Due to the alignment of the phase currents of the secondary windings of the transformer, the converter provides a six-pulse rectifying mode and, with a sufficient amount of inductance of inductive dividers, a triangular voltage is formed on the windings of the dividers.

The division of the phase currents is provided by the countercurrent of currents from the phase windings 3 and 4 of the transformer 1 through the windings of inductive dividers 5-7. For example, the phase AZ of winding 3 operates with phases L4 and C4 of winding 4.

The current flows through the circuit: phase AZ winding 3, inductive divider 5, b, thyristor 11. + converter. Simultaneously with a shift of 120 °, the current flows through the circuit: phase b4 of winding 4, inductive divider b, thyristor 10, + converter. Due to the oncoming flow of current in the windings of the inductive divider 6, the currents are aligned, and on the windings of the divider, a spur is formed — the female U (Fig. 26).

When the thyristor 9 is opened by the control pulse, the current flows through the circuit: phase c4 of winding 4, inductive divider 5, thyristor 9, + transducer. The current of the phase AZ in this case proceeds in the opposite direction with phase C4 in the induction divider 5, etc.

The average current through the windings of inductive circuits is id / b. This makes it possible to perform inductive tools with smaller weight and size indicators, and the connection of three inductive dividers improves the layout characteristics.

Claims (1)

Invention Formula AC to DC converter containing a three-phase transformer with a primary winding connected to the input terminals for connecting the supply network and two three-phase secondary windings, the first of which is connected to the forward star and the second to the reverse star, and the zero points of stars are connected to the first output pin, semiconductor devices, the conclusions of the same electrodes of which are combined into a common point connected to the second output pin, and a three-phase balancing reactor, about t - g and In order to reduce the mass and weight parameters, the leveling reactor is made of three three-wound inductive dividers, with the first winding of the first divider beginning connected to the free terminal of the electrode of the first semiconductor device, and the end of the second winding the third divider, the end of which is connected to the end of the second phase of the first secondary winding, the second winding of the first divider end is connected to the end of the first phase of the first secondary winding, and the beginning to the end of the second winding of the second d divisor, the beginning of which is connected with the free terminal electrode of the fourth semiconductor device, a third winding first end coupled to the divider terminal free the electrode of the second semiconductor device, and the beginning - with the beginning of the third phase of the second secondary winding, the first winding of the second divider end is connected to the end of the third phase of the first secondary winding, and the beginning - to the end of the first winding of the third divider, the beginning of which is connected to the free output of the fifth semiconductor electrode device, one third winding of the second divider end connected to the free electrode lead of the third semiconductor device, and the beginning to the beginning of the second phase of the second secondary winding, and a third winding of the third divider is connected to the free end of the electrode of the sixth semiconductor device, and the beginning to the beginning of the first phase of the second secondary winding of the transformer. but Urf3 4frl / cf .а5 с46да4сд / 84 аЗс4  l and, I Las 1v3 SZ 1a4 LC4 L S J AA V / v gp FIG. 2 gp