DOUBLE-CHANNEL STRAIGHTENING METHOD Russian patent published in 2019 - IPC H02M1/14 H02M7/02 H02M7/145 H02M7/162 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering, namely to the field of conversion equipment, and can be used for supply of industrial consumers and DC power transmission lines with rectified voltage with twelve pulsations. Frequency of voltage pulsations at rectifier output makes 12 during period of supply circuit and is achieved at absence of phase shift between supply secondary windings of three-phase transformer at proportion of number of turns of feeding secondary windings of main and additional channels in proportion 4 to 1 respectively. At that, it is not necessary to use windings in triangle or zigzag pattern with larger number of turns compared to that of star, thus reducing consumption of active materials of transformer. In the method of double-channel voltage rectification, half of the power valves can be uncontrolled diodes (three-phase bridge of the main channel), the other half must be controlled keys. In case it is not required to control output voltage, it is possible to use common thyristors in additional channel by supplying signal for their opening with some advance. Since the number of turns in the supply winding of the additional channel is four times less, and the main channel can be made on diodes with natural switching of currents, the method ensures good electromagnetic compatibility of the device with the supply network and low level of distortions. Principal difference of method is compensation of variable component in pulsations of main channel by pulsations of additional channel of negative polarity, which do not have constant component of voltage.

EFFECT: formation of rectified voltage at the output with low ripple coefficient with reduction of number of turns of supply three-phase winding relative to the main prototype and reduction of level of switching emissions.

1 cl, 5 dwg, 1 tbl