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在使用轫致辐射二极管产生X射线的应用中,需要可控的稳定直流电流对其阳极材料——金属钽进行加热。加热电流来自于大容量低压蓄电池,电流值需要到2 k A以上。为此,文章研制了一套基于功率IGBT的大直流断路器装置,用于控制蓄电池的放电,为金属钽加热提供稳定电流。设计过程中,利用IGBT栅极驱动改变IGBT关断速度,降低了电路中大杂散电感引起的高过压。现场试验结果表明,整套装置的持续直流电流、可关断电流和通态持续时间等指标完全满足设备需要。
In applications that use X-ray radiation from a bremsstrahlung diode, a steerable direct current is required to heat its anode material, tantalum metal. The heating current comes from a high-capacity low-voltage battery and the current value needs to be above 2 kA. To this end, the article developed a set of large DC circuit breaker device based on power IGBT, used to control the battery discharge, to provide a steady current for metal tantalum heating. During the design process, the IGBT gate drive is used to change the IGBT turn-off speed and reduce the high over-voltage caused by large stray inductance in the circuit. Field test results show that the entire device continuous DC current, turn-off current and on-time duration and other indicators fully meet the needs of equipment.