In nuclear fusion power supply systems, the thyristors often need to be connected in parallel for sustaining large current. However, research on the reverse recovery transient of parallel thyristors has not been repor...In nuclear fusion power supply systems, the thyristors often need to be connected in parallel for sustaining large current. However, research on the reverse recovery transient of parallel thyristors has not been reported yet. When several thyristors are connected in parallel,they cannot turn-off at the same moment, and thus the turn-off model based on a single thyristor is no longer suitable. In this paper, an analysis is presented for the reverse recovery transient of parallel thyristors. Parallel thyristors can be assumed as one virtual thyristor so that the reverse recovery current can be modeled by an exponential function. Through equivalent transformation of the rectifier circuit, the commutating over-voltage can be calculated based on Kirchhoff’s equation. The reverse recovery current and commutation over-voltage waveforms are measured on an experiment platform for a high power rectifier supply. From the measurement results, it is concluded that the modeling method is acceptable.展开更多
阴极短路MOS栅控晶闸管(Cathodic Short MOS-Controlled Thyristor,CS-MCT)在电容型脉冲功率系统中应用广泛,但面临电流极限的问题,尤其是在大电容高电压条件下,这就需要解决MCT器件并联均流的问题。进行理论和仿真分析栅驱动电阻对并...阴极短路MOS栅控晶闸管(Cathodic Short MOS-Controlled Thyristor,CS-MCT)在电容型脉冲功率系统中应用广泛,但面临电流极限的问题,尤其是在大电容高电压条件下,这就需要解决MCT器件并联均流的问题。进行理论和仿真分析栅驱动电阻对并联均流的影响,并采用导通延迟补偿法对器件均流进行改善。测试验证MCT并联可以提高电流极限,并验证导通延迟补偿法可以改善器件均流特性。展开更多
基金supported by the International Thermonuclear Experimental Reactor Project of China(No.2008 GB104000)
文摘In nuclear fusion power supply systems, the thyristors often need to be connected in parallel for sustaining large current. However, research on the reverse recovery transient of parallel thyristors has not been reported yet. When several thyristors are connected in parallel,they cannot turn-off at the same moment, and thus the turn-off model based on a single thyristor is no longer suitable. In this paper, an analysis is presented for the reverse recovery transient of parallel thyristors. Parallel thyristors can be assumed as one virtual thyristor so that the reverse recovery current can be modeled by an exponential function. Through equivalent transformation of the rectifier circuit, the commutating over-voltage can be calculated based on Kirchhoff’s equation. The reverse recovery current and commutation over-voltage waveforms are measured on an experiment platform for a high power rectifier supply. From the measurement results, it is concluded that the modeling method is acceptable.
文摘阴极短路MOS栅控晶闸管(Cathodic Short MOS-Controlled Thyristor,CS-MCT)在电容型脉冲功率系统中应用广泛,但面临电流极限的问题,尤其是在大电容高电压条件下,这就需要解决MCT器件并联均流的问题。进行理论和仿真分析栅驱动电阻对并联均流的影响,并采用导通延迟补偿法对器件均流进行改善。测试验证MCT并联可以提高电流极限,并验证导通延迟补偿法可以改善器件均流特性。
