RU1791937C - Controlled alternating to direct voltage converter - Google Patents

Description

K-4 -.- "sar .5

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: The invention relates to the field of electrical:; . :. . .. ;

. The well-known device contains a transformer, in the primary winding of which is included simistgor. and the secondary is connected to the dibDnrmu bridge. The disadvantage of this device is the poor quality of the output voltage. ; - The closest in technical essence and Achieved results is a controlled AC / DC converter, containing input terminals for connecting three phases and a neutral output of the mains supply, the first transformer with primary and secondary windings, two triacs and a bridge diode nu straighten. the input is connected to the secondary winding of the transformer, and the output is connected to output terminals for connecting the load, the first terminal of the primary winding of the transformer connected to the first terminals of the triacs, the control inputs of which are connected to

the outputs of the phase control units, the inputs connected to the output of the voltage regulator, and the second terminal of the first sensor is connected to the input terminal to connect the phase C of the supply network.

The disadvantage of the converter is its complexity, because for normal operation two more triacs and a transformer output are required. This circumstance also reduces reliability.

The purpose of the invention is to simplify and increase reliability.

The goal is achieved by the fact that the converter is additionally equipped with a second transformer, the primary winding of which is connected to the input terminals for connecting phase B and the neutral terminal of the supply network, and the secondary is connected between the second terminals of the second triac and the primary winding of the first transformer, with the common connection point of the secondary winding of the second transformer and

VI

che

Yu

from VI

the primary winding of the first transformer is connected to an input terminal for connecting phase A of the supply network.

Significant differences of this solution are the availability of a new unit - the second 5th transformer and new communications. Thanks to these connections and the unit, the device circuitry is significantly simplified, since there is no need for additional speakers and blocks

threatened “4, ... 10

In FIG. 1 pr.Shёdena.schema device; nafig. 2 - ve o Y daagram a.

The first transformer 1 of the secondary winding is connected to the diode bridge 2, and the HHJVI output of the primary winding is connected to 15 symbols 3 and 4, the phase control units 5 and 6 are connected to the control inputs. The inputs of these units are connected to controller 7. The second transformer 8 is connected by a secondary winding to one 20 output of the primary winding rteipibrb of transformer 1 and to simulator 4. (The letters A, B, C, O indicate network outputs).

The rectifier works as follows: «m):: / :: ;;:; С, v;: ;;:, ;;:. / ;, 25

The voltage supplied by the non-transformer 1 is transmitted to the bridge 2, which rectifies it. The magnitude of the voltage varies; signal of controller 7, which causes a change in the phase of the pulse signal supplied by 30 from the output of blocks 5 and b to the Symistors 3.4. The phase of this signal is the ON angle and varies within 135 °. On one stage, triac 3 is switched on, nd-c f giving the line voltage segment AC, 35 and after tripping the triac 3 triac 4 is turned on, supplying the phase voltage segment 0B, which, as follows from the Vector diagram (Fig. 2), sTvTut 90 °. Thanks to this output 40

has a double ripple frequency. Transformer 8 has an increasing transformation coefficient equal to UEH.

Thus, the proposed circuit eliminates the need for additional triacs.

Claims (1)

Formula Invented and Controlled AC / DC Converter Containing BkOflttae; inputs For connecting the three and zero output terminals of the mains supply, the first transformer with primary and secondary circuitry, Two simbras and a bridge diode rectifier, with an input connected to the secondary winding of the transformer, and an output with output terminals for connecting the load, the first terminal of the primary winding the transformer is connected to the first terminals of the simistors, the control inputs of which are connected to the outputs of the phase control units, the inputs connected to the output of the voltage regulator, and the second terminal of the first triac connected to the input terminal for connecting the phase C of the mains supply, and with the fact that, in order to simplify the reliability of the GNSS, it is additionally equipped with a second transformer, the primary winding of which is connected to the input terminals for connecting the phase B and zero output. power supply network; and the secondary is connected between the second terminals of the etopofo triac and the primary winding of the first transformer, the common connection point of the secondary winding of the second transformer and the primary winding of the first transformer being connected to the input terminal for connecting phase A of the supply network. FIG. 2 Fig. /