摘要
由于传统驱动电路难以发挥新型器件GaN HEMT的高频优势,为了提高电路工作频率,充分利用GaN HEMT特性,设计了一种适用于该器件的驱动电路。经过对比分析GaN HEMT器件和Si MOSFET器件的寄生参数和工作特性,得出GaN HEMT的特点和对驱动电路的要求;采用LTspice软件仿真,描述该驱动电路低损耗和快速性特征,实现高/低电平箝位功能;通过搭建Boost电路,实验验证预充电式驱动电路的有效性。结果表明:在频率500 kHz、输出电压75 V的工作条件下,该驱动电路与谐振式驱动电路相比损耗下降45.8%,可实现GaN HEMT器件在9 ns内开通、15 ns内关断,比独立拉灌式驱动条件下的开关速度分别提高11 ns和24 ns,更能发挥GaN HEMT高频特性,同时该电路还具有高/低电平箝位功能,提高了电路工作可靠性。
Because the traditional drive circuit is difficult to give full play to the high-frequency advantages of GaN HEMT,a drive circuit suitable for this device is designed in order to improve the working frequency of the circuit and make full use of GaN HEMT characteristics.By comparing the parasitic parameters and working characteristics of GaN HEMT devices and Si MOSFET devices,the advantages of GaN HEMT and the requirements for drive circuits are obtained.Simulation with LTspice software proves that the drive circuit has the characteristics of low dissipation,high speed and high/low level clamping.Finally,Boost circuit is built to verify the effectiveness of the precharge drive circuit.The results show that under the operating conditions of 500 kHz frequency and 75 V output voltage,the loss of the drive circuit is 45.8%lower than that of the resonant drive circuit.GaN HEMT devices can be turned on and off in 9 ns and 15 ns,respectively.And the switching speed can be increased by 11 ns and 24 ns,respectively,compared with the switch speed under the independent pullar-irrigation driving condition,which can achieve the high-frequency characteristics of GaN HEMT.The circuit also has a high/low level clamping function,which greatly improves the working reliability.
作者
高圣伟
段尧文
刘晓明
李龙女
董晨名
GAO Sheng-wei;DUAN Yao-wen;LIU Xiao-ming;LI Long-nv;DONG Chen-ming(Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology,Tiangong University,Tianjin 300387,China;Postdoctoral Research Station of School of Mechanical Engineering,Tiangong University,Tianjin 300387,China;Tianjin JinWo Energy Technology Co.,Ltd.,Tianjin300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2020年第1期69-76,共8页
Journal of Tiangong University
基金
国家自然科学基金重点资助项目（51337001）
国家自然科学基金资助项目（51777136）
新能源电力系统国家重点实验室联合基金（LAPS16017）
