A Multi-Stair Case Wave PWM Inverter by Complementary Transistor

상보형 트랜지스테에 희한 다단 계단파 PWN 인버터

The PWM inverter investigated in this paper utilizes a bridge type current sharing reactor circuit with tow pairs of complementary transistor at each phase. The driving signals for this inverter are 3 level PWM waves of W type an M type modulation, which are obtained from a microprocessor based on the switching time data obtained by switching position calculation of triangular and sine modulation wave. The output voltage waveforms of this inverter have 5 level phase voltage and 9 level line voltage of PWM. The harmonics of the output voltage are reduced to half when it is compared with single CTI, and the occurrence of harmonics is also reduced.