The improved current-doubler-rectifier zero-voltage-switching PWM full-bridge converter (CDR ZVS PWM FB converter) achieves ZVS for the switches in a wide load range with the use of the energy stored in the output fil...The improved current-doubler-rectifier zero-voltage-switching PWM full-bridge converter (CDR ZVS PWM FB converter) achieves ZVS for the switches in a wide load range with the use of the energy stored in the output filter inductances, and the rectifier diodes commute naturally, therefore no oscillation and voltage spike occurs. The transformer needs no special manufacture method to limit the leakage inductance. The ZVS achievement and the design considerations for the output filter inductances and the blocking capacitor are discussed for the improved CDR ZVS PWM FB converter. A 540 W prototype converter is built in the lab to verify the operational principle and design considerations for the improved converter, the experimental results are also included.展开更多
The impact of XPM on the microwave photonic switching with NOLM is analyzed by the split-step Fourier method （SSFM） that can solve the coupled nonlinear Schrodinger equation （CNLSE）. The simulation results show th...The impact of XPM on the microwave photonic switching with NOLM is analyzed by the split-step Fourier method （SSFM） that can solve the coupled nonlinear Schrodinger equation （CNLSE）. The simulation results show that XPM induces the distortion of waveforms and the leak of side lobes. And the larger the modulation bandwidth is, the larger the leak of side lobes is. Furthermore, the power transmission function of NOLM T is distorted because of the XPM-induced nonreciprocity： Tm decreases when the splitting ratio of the coupler f∈（0,0.5） and increases when f∈（0.5,1.0）.展开更多
文摘The improved current-doubler-rectifier zero-voltage-switching PWM full-bridge converter (CDR ZVS PWM FB converter) achieves ZVS for the switches in a wide load range with the use of the energy stored in the output filter inductances, and the rectifier diodes commute naturally, therefore no oscillation and voltage spike occurs. The transformer needs no special manufacture method to limit the leakage inductance. The ZVS achievement and the design considerations for the output filter inductances and the blocking capacitor are discussed for the improved CDR ZVS PWM FB converter. A 540 W prototype converter is built in the lab to verify the operational principle and design considerations for the improved converter, the experimental results are also included.
基金This research is supported by the National Science Foundation ofChina (No. 60272048)the Special Science Foundation for the Excellent Teacher Lecturer of Shanghai.
文摘The impact of XPM on the microwave photonic switching with NOLM is analyzed by the split-step Fourier method （SSFM） that can solve the coupled nonlinear Schrodinger equation （CNLSE）. The simulation results show that XPM induces the distortion of waveforms and the leak of side lobes. And the larger the modulation bandwidth is, the larger the leak of side lobes is. Furthermore, the power transmission function of NOLM T is distorted because of the XPM-induced nonreciprocity： Tm decreases when the splitting ratio of the coupler f∈（0,0.5） and increases when f∈（0.5,1.0）.
