METHOD OF CONVERSION OF CONSTANT VOLTAGE TO QUASI-SINUSOIDAL ONE WITH PULSE-WIDTH MODULATION Russian patent published in 1997 - IPC

FIELD: power conversion equipment, design of inverters with improved quality of output voltage fed from decreased values of voltage of the order of 12-27 V. SUBSTANCE: in compliance with method two voltages of two-polar pulse-width modulation which are realized by zero inverter cells are used for formation of quasi-sinusoidal voltage with unipolar pulse-width modulation. One of voltages is formed on basis of comparison of master signal of sinusoidal shape with odd pulses of scanning signal and the other one is formed on basis of comparison of same master signal with even pulses of scanning signal. Summing of voltages is carried out either in series or in parallel electric circuits. In the latter case summing electromagnetic unit-two-winding filter-transformer is used. EFFECT: improved quality of output voltage of inverters built on basis of proposed method. 4 cl, 6 dwg