【摘 要】
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In this paper the influence of different carrier waveforms upon the output characteristics of PWM inverter is described indetail. When a triangular carrier wave
【机 构】
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School of Electromechanical Engineering and Automation, Shanghai University, Shanghai 200072, China
论文部分内容阅读
In this paper the influence of different carrier waveforms upon the output characteristics of PWM inverter is described indetail. When a triangular carrier waveform is used in hard-switching PWM inverters, harmonics exist in the neighborhood of the out-put frequency of the inverter output voltage and current due to the dead time. The triangular carrier waveform used in soft-switchingPWM inverter will cause difficulties in controlling resonance-trigger time, higher loss in the resonant circuit, and less utilization ofthe DC bus voltage. If a sawtooth carrier is used in hard-switching PWM inverter, there will be severe distortion in the current wave-form. When sawtooth carriers with alternate positive and negative slopes are used in soft-switching PWM inverters, the resonance-trigger time is easy to control, and distortion in the output voltage and current caused by the dead time will not appear.
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