SU1467712A1 - D.c. to a.c. voltage converter - Google Patents

Abstract

The invention relates to electrical engineering, in particular to semiconductor converters of electrical energy used in uninterruptible power supply installations. The purpose of the invention is to simplify by reducing the number of power diodes. The device contains a control unit 1, inverters 2 and 3. On two magnetic conductors 4 and 5, there are two primary windings 6, 7 and 8, 9, respectively. Secondary winding 10 covers both magnetic conductors 4 and 5 simultaneously and is connected to receiver 11 electric power. Two additional windings 12 and 13 are respectively located on the magnetic conductors 4 and 5 and are interconnected anti-serially through the key 14 of the alternating current. One of the high-speed switches 15 and 16 is connected to the combined DC terminals of the inverter bridges 2 and 3. The middle terminals of the primary windings 6 and 7 of the inverter 2 and the windings-8 and 9 of the inverter 3 are connected to the terminals of the power supply 17. The output voltage of the converter is kept constant due to the connection of the winding 13 of the magnetic core 5 to the winding 12 of the magnetic core 4 by means of a key 14. 1 sludge. from the next

Description

the keys providing conductivity only in the forward direction are schematically depicted as serially connected key element 34 and diode 35.

The Converter operates as follows.

In the operating mode when the power switches of the inverters 2 and 3 are in good condition, the high-speed switches 15 and 16 are closed and the key 14 is open. At the same time, different-type DC output terminals of the fusion power bridges of each inverter are interconnected, which ensures the operation mode of the inverters, which is equivalent to the operation mode of the traditional voltage inverter bridge circuit, in which two-way electric power exchange takes place.

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Inverter 3 works in the same way.

In case of breakdown or loss of control of the power switches 18-21 by the inverter 2, the Tblock 1 control unit opens the fast-acting switch 15 and closes the switch 14. At the same time, regardless of the state of the power switches 18-21 of the inverter 2, its primary windings 6 and 7 are open between by themselves (due to the break of the DC circuit of the rectifying bridges) and do not affect the electromagnetic processes in the magnetic circuit 4. The output voltage of the converter is kept constant by connecting the additional winding 13 of the magnetic circuit 5 to d additionally winding 12 of the magnetic circuit 4 by means of a key 14.

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five

: In a similar way, the converter operates with intact power switches of inverter 2 and faulty power switches of inverter 3.

Claims (1)

Invention Formula DC converter: voltage to AC containing inverters, each of which includes power switches, diodes and a high-speed DC switch, a transformer node composed of separate magnetic cores, each of which is common to all magnetic circuits the secondary winding, the outputs of which are output, an additional winding connected via an AC switch with the analogous winding of the magnetic circuit, and the primary windings, as well as a control unit, the output connected to the control By the inputs of power switches, characterized in that, in order to simplify by reducing the number of power diodes, two primary windings are placed on each magnetic core, the diodes and power switches of each inverter form two single-phase rectifying bridges, the one named DC outputs of which connected to each other and connected to the oppositely polarized power leads of a high-speed switch; primary windings of the corresponding magnetic core are connected to the terminals of the alternating current 5 of the cc bridge; e terminals are connected to the input terminals, wherein the first two power key inver0 torus are connected in series with the cathode group dioch rows of the first bridge, and two second inverter power key - a second group diodes anode bridge.