| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 105 === As the environmental contamination getting worse, high-voltage pulse technology develops rapidly in environmental governance, cereals sterilization, dust disinfection and other livelihood applications. However, in the high-voltage pulse technique, switching element is very important. When a high switching frequency is required in high-voltage pulse circuit, conventional circuit breaker is not suitable because it cannot operate in high frequency even if it can withstand a high voltage and current. On the other hand, semiconductor switch can achieve high switching frequency but the maximum voltage and current rating are very low and difficult to be used in high-voltage pulse application. Thus, by applying the cascading technique to the semiconductor switches can meet the requirement of high withstand voltage. The crucial issue in series the semiconductor switches is to ensure that during the transitional state when the switches are turned-on and turned-off, the voltage across each switch are merely same in order to avoid overvoltage that will cause damage to the switches.
The proposed driver circuit in this thesis is designed for a four series connected IGBT which can withstand 600 V each, input voltage of 2000 V and switching frequency of 50 kHz. The proposed driver circuit is implemented to synchronize the IGBT to turned on and turned off at the same time. Finally, an experiment is implemented to verify the theoretical analyses of this thesis.
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