一种电流自适应的尖峰电压限制型功率管关断控制方法

发布时间：2018-05-16 12:42

本文选题：驱动电路 + 功率开关管　；参考：《中国电机工程学报》2014年30期

【摘要】：针对传统的驱动电路固定化的驱动电流无法优化开关器件损耗的问题,提出了一种根据开关管电流调整器件关断速度的方法。在一个平均电流控制的Boost电路中,用电流指令信号来调节驱动电路的关断电流大小。当电流指令信号越大时,驱动电流的关断电流越小;反之相反。这样就实现了在小电流(轻载)下开关管的关断速度更快,关断损耗更小。可以使用一个晶体管电路来实现电流指令对驱动关断电流的调整。设计的原则是,在一定的小电流下器件的关断电压尖峰不大于额定电流下器件的关断电压尖峰。分析了器件的关断特性,讨论了尖峰电压与驱动电流和漏感之间的关系。在一个200 V输入/380 V输出/功率1 kW的Boost电路上进行测试,结果表明采用所提出的驱动电路,轻载下效率比传统的方法提升了1%以上。
[Abstract]:In view of the problem that the driving current fixed by the traditional drive circuit is unable to optimize the switching loss of the switch device, a method of adjusting the switch off speed based on the switch tube current is proposed. In an Boost circuit controlled by an average current, the current command signal is used to adjust the turn off current of the drive circuit. The turn off current of the driving current is smaller, and vice versa. Thus, the switching speed of the switch tube is faster and the turn off loss is smaller under the small current (light load). A transistor circuit can be used to adjust the current instruction to the drive off current. The principle of the design is to turn off the voltage peak of the device under a certain small current. The turn off voltage peak of the device under the rated current is not greater than that of the device. The relationship between the peak voltage and the driving current and the leakage inductance is discussed. The test on a Boost circuit with a 200 V input /380 V output / power 1 kW shows that the efficiency of the light load is better than the traditional method. More than 1%.

【作者单位】：华东交通大学电气学院;
【基金】：国家自然科学基金项目(51467005) 江西省自然科学基金项目(20142BAB206025) 江西省专利技术研发引导与产业化示范项目(20133BBM26077)~~
【分类号】：TM46

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