| Title |
Synchronization on the Points of Turn -off Time of Series-Connected Power Semiconductor Devices Using the Miller Effect |
| Keywords |
스너비 커패시터 ; 고압전력변환장치 ; 직렬연결 ; 밀러효과 Snubber Capacitor ; High Voltage Converters ; Series-Connection ; Miller Effect |
| Abstract |
The large value of the snubber capacitor is needed to protect the devices in high voltage converters using series connected power semiconductors. But that results in more losses and longer commutation time. So, new technique of series connection is required, which can minimize the value of snubber capacitor and also promote the reliability of high voltage converters. We study on the switching characteristics of series connected power semiconductors and then propose a novel switching algorithm for series-connection which is able to implement not only the dynamic voltage balancing in spite of the differerce of switching characteristics, but the minimization of the value of snubber capacitor, through the change of the value of snubber capacitor by Miller effect. Finally, we illustrate the validity of this synchronization by computer simulation and experimental results. |