BRIDGE CIRCUIT THREE-PHASE VOLTAGE INVERTER CONTROL METHOD Russian patent published in 2018 - IPC H02M1/12 H02M7/48 H02M7/527 H02M7/5387 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering, and can be used in the centralized type three-phase voltage inverters (TVI) construction for the three-phase and single-phase loads feeding. In the control method over the bridge circuit three-phase voltage inverter comprising four key racks, included between the positive and negative power buses thereof, consisting in the generation of triangular sweep waveform u_p(t) with the maximum value of U_pm and frequency of ƒ_p, three successively phase shifted by the angle of 2π/3 setting signals with the sinusoidal form u_zj(t)=U_zmsin[ωt-(j-1)2π/3] with amplitude U_zm and frequency F=ω/2π, where j=A, B, C – phase index, if the condition is fulfilled F<<ƒ_p, by the u_p(t) and u_zj(t) signals logical comparison and the signals with pulse width modulation (PWM) generation on this basis by the three racks control keys, as well as the u₄(t) signal generation by the 4th rack control keys, during the signal u₄(t) generation setting the U_zm>U_pm condition, generating the three quasi-trapezoidal signals u_ktzj(t) by the three driving signals u_zj(t) limiting at their current values equality level to the scanning signal U_ktzj(max)=U_pm maximum value, summing up the three received signals – , multiplying the total signal by the factor of 1/3 and based on the received signal (1/3)⋅u_{ktz Σ}(t) logical comparison with the sweep signal u_p(t) generating the forward and inverse signals with the fourth rack keys control pulse width modulation. Additional rack keys 7, 8 control is carried out by the PWM method, generating the three successively phase shifted by the angle of 2π/3 reference signals 25, 26, 27 of sinusoidal shape u_zj(t)=U_zmsin[ωt-(j-1)2π/3] with amplitude U_zm and frequency F=ω/2π, where j=A, B, C – phase index.

EFFECT: technical result is increase in the efficiency.

1 cl, 3 dwg