SU1557650A1 - Controllable ac voltage-to-ac voltage converter - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to simplify. The converter contains a booster transformer 1, three semiconductor switches 7, 8, 9, a fully controlled semiconductor device 20, a control unit 21. The primary winding sections of the booster transformer 1 are connected via a semiconductor switches 7, 8 and 9 to the input voltage source, creating voltage boosting modes, or voltage gains. The goal is achieved by making the semiconductor switches 7, 8 and 9 as two series-connected thyristors and combining their like terminals into common points 18 and 19, which allows one fully controlled semiconductor device 20 connected between common points to be used to control the output voltage. . 1 il.

Description

The invention relates to electrical engineering.

The purpose of the invention is simplification. The drawing shows a diagram of the Converter.

The device contains a voltage transformer 1, the secondary winding 2 of which is connected between the first input 3 and the first output 4 terminals. The primary winding of the boost transformer 1 contains two serially connected sections 5 and 6, the common point of which is connected to the first input terminal 3. The output of section 5 of the primary winding of the additional booster transformer 1 is connected to the first output of the first semiconductor switch 7. The output of section 6 of the primary winding of optional additional transformer I is connected to the first terminal of the second semiconductor key 8. The first terminal of the third semiconductor key 9 is connected to the second input terminal 10 and the second output terminal 11. Semiconductor switches 7-9 are made in the form of two series-connected thyristors 12 and 13, 14 and 15, 16 and 17, respectively. The midpoint of the thyristors 12 and 13, 14 and 15, 16 and 17 forms the first pin of the semiconductor switches 7-9, respectively. Thyristor anodes 12, 14 and J6 are the second pins of the semiconductor switches 7-9, and the cathodes of the thyristors 13, J5 and 17 are the third pins of the semiconductor switches 7-9. The second and third pins of semiconductor switches 7-9 are combined respectively into two common points 18 and 19, which are shunted with a fully controlled semiconductor device 20. The inputs of control unit 21 are connected to first 4 and second 11 output pins and outputs are connected to thyristor 12 control outputs -17 and fully controlled semiconductor key 20.

The device works as follows.

If the output voltage is higher than the rated output voltage, then at the beginning of each half-cycle of the input voltage, the control unit 21 turns on the fully controllable semiconductor device 20 and the semiconductor switches 7 and 8. The output voltage is almost equal to the input voltage

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control block 2) removes control pulses arriving at the control inputs of the fully controlled semiconductor device 20 and semiconductor switches 7 and 8. After the thyristors of the semiconductor key 8 are closed, the control pulses are fed to the fully controlled semiconductor device 20 and semiconductor switches 7 and 9, as a result, the primary winding section of the booster transformer 1 is connected to the input voltage source, which ensures the voltaic mode. If the input voltage decreases, then at the beginning of each half-cycle of the input voltage, the fully controlled semiconductor device 20 and the semiconductor switches 8 and 9 turn on, providing connection of the primary winding section 6 of the booster transformer 1 to the input voltage source, which provides the booster mode. With a time shift determined by the magnitude of the output voltage deviation from the nominal value, control unit 21 removes control pulses fed to the control inputs of the fully controlled semiconductor key 20 and semiconductor key 9. After the thyristors of the semiconductor key 9 are locked, control pulses are sent to the control inputs of the fully controlled semiconductor device 20 and the semiconductor switches 7 and 8. In this case, the output voltage is almost equal to the input voltage.

Claims (1)

Invention Formula An adjustable AC-to-voltage converter contains a booster transformer, the secondary winding of which is connected between the first input and the first output pins, and the primary winding contains two sections connected in series, the common point of which is connected to the first input terminal, the first, second and third semiconductor switches, one of which515576506 ryh shunted fully controlled in two connected in series my semiconductor device, at the first and second thyristors, among which the outputs of the primary winding sections of the point are the first booster transformer by co-output semiconductor switches, dinene according to the first output anodes of the first thyristors and cathodes The dami of the first and second semiconductor-second thyristors, respectively, of the ob-keys, and the control unit, are united and form two common points, the inputs of which are connected to the first are the second and third pins and the second output pins, and JQmi semiconductor switches, which the second output and the second input are fully controlled the pins are combined, I distinguish with a semiconductor device, and the first u and with the fact that, in order to simplify the output of the third semiconductor Scheni, the first, second and third semi-key connected to the second input of the wiring keys are made in the form of water.