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一种电流自适应的尖峰电压限制型功率管关断控制方法

DOI: 10.13334/j.0258-8013.pcsee.2014.30.021, PP. 5425-5433

Keywords: 驱动电路,功率开关管,电压尖峰,电流自适应,关断速度,功率损耗

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Abstract:

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200V输入/380V输出/功率1kW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。

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