文中提出一种非隔离型软开关高增益准Z源DC-DC变换器。变换器具有输入电流连续、输入与输出供地、高电压增益以及开关器件应力小等优点。同时,变换器中所有开关管都工作在零电压开关(zero voltage switching,ZVS)条件下,所有二极管都工...文中提出一种非隔离型软开关高增益准Z源DC-DC变换器。变换器具有输入电流连续、输入与输出供地、高电压增益以及开关器件应力小等优点。同时,变换器中所有开关管都工作在零电压开关(zero voltage switching,ZVS)条件下,所有二极管都工作在零电压零电流开关(zero-voltage zero-current switching,ZVZCS)条件下,可以减小开关管的开关损耗以及二极管的反向恢复损耗。通过引入三耦合绕组提高变换器电压增益,同时,有源钳位电路的加入减小了开关管两端的电压尖峰。较小感值的耦合电感相应的铜损小、体积小,进而提高了变换器的效率和功率密度。深入分析变换器的工作模态,推导变换器的电压增益以及元器件的电压、电流应力,进行稳态分析和参数设计。最后,搭建一台100 kHz、200 W、38~380 V的实验样机,变换器在额定功率的效率为96.13%,实验结果与理论分析相吻合,证明所提变换器的可行性。展开更多
A low-voltage, low-power, and high-gain rail-to-rail operational amplifier （OpAmp） is presented. The replica-amplifier gain enhancement technique is applied to improve the DC gain of the amplifier, which does not de...A low-voltage, low-power, and high-gain rail-to-rail operational amplifier （OpAmp） is presented. The replica-amplifier gain enhancement technique is applied to improve the DC gain of the amplifier, which does not degrade the output swing and is very suitable for low-voltage applications. In a 0. 18/μm standard CMOS process,a 1V OpAmp with rail-to-rail output is designed. For a load capacitance of 5 pF,simulation by HSPICE shows that this OpAmp achieves an effective open-loop DC gain of 65. 9dB,gain bandwidth of 70.28 MHz,and phase margin of 50 with a quiescent power dissipation of 156.7μW.展开更多
文摘A low-voltage, low-power, and high-gain rail-to-rail operational amplifier （OpAmp） is presented. The replica-amplifier gain enhancement technique is applied to improve the DC gain of the amplifier, which does not degrade the output swing and is very suitable for low-voltage applications. In a 0. 18/μm standard CMOS process,a 1V OpAmp with rail-to-rail output is designed. For a load capacitance of 5 pF,simulation by HSPICE shows that this OpAmp achieves an effective open-loop DC gain of 65. 9dB,gain bandwidth of 70.28 MHz,and phase margin of 50 with a quiescent power dissipation of 156.7μW.
