Nowadays, switching power supplies are used in almost all electronic devices to regulate the voltage amplitude. The only obstacle on using these devices is the production of high frequency harmonics that violates diff...Nowadays, switching power supplies are used in almost all electronic devices to regulate the voltage amplitude. The only obstacle on using these devices is the production of high frequency harmonics that violates different standards such as （FCC, VDE, 461 ）. In this paper the sources of various noises in switching power supplies will be introduced. Then, using appropriate model for high frequency transformers, a sample switching power supply will be simulated. In this simulation, the effect of leakage inductance on current and voltage waveforms of the input and output switches, which are the main cause of common mode differential mode noises and radiations, will be discussed and harmonically analyzed. Finally the experimental results will confirm the simulation conclusions.展开更多
叙述了本征热激发载流子浓度对功率半导体器件的重大影响,希望得到一个理论符合实际的定量计算公式。比较国内外权威的本征热激发载流子浓度公式,经过计算并与晶闸管、整流管漏电流的实测数据相比较,初步认定S K Ghandhi给出的本征热激...叙述了本征热激发载流子浓度对功率半导体器件的重大影响,希望得到一个理论符合实际的定量计算公式。比较国内外权威的本征热激发载流子浓度公式,经过计算并与晶闸管、整流管漏电流的实测数据相比较,初步认定S K Ghandhi给出的本征热激发载流子浓度公式可以作为适用于功率半导体器件的简明公式,并进行了适当的理论说明及公式意义的阐述。展开更多
文摘Nowadays, switching power supplies are used in almost all electronic devices to regulate the voltage amplitude. The only obstacle on using these devices is the production of high frequency harmonics that violates different standards such as （FCC, VDE, 461 ）. In this paper the sources of various noises in switching power supplies will be introduced. Then, using appropriate model for high frequency transformers, a sample switching power supply will be simulated. In this simulation, the effect of leakage inductance on current and voltage waveforms of the input and output switches, which are the main cause of common mode differential mode noises and radiations, will be discussed and harmonically analyzed. Finally the experimental results will confirm the simulation conclusions.
文摘叙述了本征热激发载流子浓度对功率半导体器件的重大影响,希望得到一个理论符合实际的定量计算公式。比较国内外权威的本征热激发载流子浓度公式,经过计算并与晶闸管、整流管漏电流的实测数据相比较,初步认定S K Ghandhi给出的本征热激发载流子浓度公式可以作为适用于功率半导体器件的简明公式,并进行了适当的理论说明及公式意义的阐述。
