一种适用于氮化镓半桥结构的高可靠性差分电流补偿电平移位电路  

A High-Reliability Differential Current Compensation Level Shift Circuit for GaN Half-Bridge

作　　者：赵鹏[1] 姜梅[1] ZHAO Peng;JIANG Mei(College of Electronics and Information Engineering,Shenzhen University,Shenzhen,Guangdong 518061,China)

机构地区：[1]深圳大学电子与信息工程学院,广东深圳518061

出　　处：《电子学报》2022年第11期2561-2567,共7页Acta Electronica Sinica

基　　金：广东省重点科技产业质量基础共性技术研究及应用(No.2020B0404030004)。

摘　　要：为了提高氮化镓半桥结构的抗dv/dt特性,提出了一种适用于氮化镓半桥结构的高可靠性差分电流补偿新颖电平移位电路.该电路在自举电容作用下,将0 V~5 V输入电压转换为35 V~40 V输出电压,并且在浮点电压快速变化过程中,输出的驱动电压均保持稳定.电路采用电流镜结构传输信号,能够实现电平信号的快速传递,有效地减小传输延迟.对于浮点电压的快速变化导致移位电平器输出变化的问题,采用新颖的差分电流结构进行电流补偿,提高电路的抗dv/dt特性,获得高可靠性的输出电压.本电路基于标准0.35μm BCD工艺40 V的LDMOS耐压器件,对该电平移位电路在1 MHz频率下进行验证.结果表明上升沿响应延迟为587.184 ps,下降沿响应延迟为832.144 ps,抗正的dv/dt变化为116 V/ns以及对负dv/dt变化不敏感,该电路具有高速,高可靠性优点.In order to improve the power supply slew tolerance of the GaN half-bridge structure,a high-reliability differential current compensation level shift circuit suitable for GaN half-bridge structure is proposed.With the help of bootstrap capacitor,this circuit converts the input voltage of 0V to 5V into the output voltage of 35V to 40V and the output driving voltage remains stable during the rapid change of floating-point voltage.The circuit adopts a current mirror structure to transmit signals,which can realize the rapid transmission of level signals and effectively reduce the transmission delay.Since the rapid changing of the power supply voltage causes the output of the level shifter to change,in order to solve this issue,we propose a differential current structure,which is used for current compensation to improve the power supply slew tolerance and stabilize the output result based on the standard 0.35μm BCD(Bipolar-CMOS-DMOS)process and 40V LDMOS(Laterally Diffused Metal-Oxide Semiconductor)high voltage devices,the level shift circuit is verified at 1MHz frequency.The results show that the rising edge response delay and the falling edge response delay are 587.184ps and 832.144ps,respectively,a 116V/ns positive power-rail slew tolerance and infinite negative slew tolerance.This circuit has the advantages of high speed and high reliability.

关 键 词：氮化镓 电平移位 电流补偿 半桥结构 自举电容 降压式变换电路 

分 类 号：TN432[电子电信—微电子学与固体电子学]