为提高大电流低压差线性稳压器(Low-Dropout Linear Regulator,LDO)在全负载范围内的稳定性,提出了一种利用负载追踪补偿的LDO电路。该电路采用改进型动态零点补偿技术和阻抗衰减技术,分别实现了零点追踪和极点追踪,同时利用电流缓冲补...为提高大电流低压差线性稳压器(Low-Dropout Linear Regulator,LDO)在全负载范围内的稳定性,提出了一种利用负载追踪补偿的LDO电路。该电路采用改进型动态零点补偿技术和阻抗衰减技术,分别实现了零点追踪和极点追踪,同时利用电流缓冲补偿解决了Miller补偿导致的右平面零点问题,使得稳压器可以在宽负载电流范围下稳定工作。电路采用0.18μm BCD工艺进行设计,仿真结果表明,所设计的LDO电路静态电流为56.3μA,在空载情况下的相位裕度为52°,3 A满载时相位裕度达到85°,在全负载范围内均具有良好的稳定性。展开更多
To achieve palm oil conversion along with a high yield of long‐chain alkane,a series of NiFe layered double oxide catalysts were prepared and employed in the deoxygenation of palm oil.The layered structure of these c...To achieve palm oil conversion along with a high yield of long‐chain alkane,a series of NiFe layered double oxide catalysts were prepared and employed in the deoxygenation of palm oil.The layered structure of these catalysts was confirmed by XRD and SEM analyses,and Ni and Fe species existed primarily in the forms of Ni^(2+)and Fe^(3+),respectively.It was found that Ni/Fe molar ratio influenced the H_(2)reducibility and surface properties of NiFe catalysts.Specifically,Ni_(2)Fe‐LDO and Ni_(3)Fe‐LDO exhibited higher reducibility under H_(2)atmosphere.Moreover,the Ni_(2)Fe‐LDO catalyst contained a higher concentration of surface oxygen species(Osurf).Deoxygenation results demonstrated that the Ni_(2)Fe‐LDO catalyst achieved superior palm oil conversion,higher liquid product yield and enhanced selectivity toward C_(15)–C_(18)hydrocarbons compared to other catalysts.This improved performance was attributed to its higher hydrogen dissociation activity and enhanced adsorption capacity for palm oil molecules.Furthermore,reaction condition studies revealed that palm oil was completely converted,yielding 86.8%liquid product with 81.8%selectivity of C_(15)–C_(18)hydrocarbons at 350℃under 7 MPa H_(2)pressure.This finding provides an insight into the development of efficient catalysts for the deoxygenation of fatty compounds to biofuels.展开更多
文摘为提高大电流低压差线性稳压器(Low-Dropout Linear Regulator,LDO)在全负载范围内的稳定性,提出了一种利用负载追踪补偿的LDO电路。该电路采用改进型动态零点补偿技术和阻抗衰减技术,分别实现了零点追踪和极点追踪,同时利用电流缓冲补偿解决了Miller补偿导致的右平面零点问题,使得稳压器可以在宽负载电流范围下稳定工作。电路采用0.18μm BCD工艺进行设计,仿真结果表明,所设计的LDO电路静态电流为56.3μA,在空载情况下的相位裕度为52°,3 A满载时相位裕度达到85°,在全负载范围内均具有良好的稳定性。
基金National Natural Science Foundation of China(22278084)State Key Laboratory of Heavy Oil Processing(SKLHOP202402003)for financing this research.
文摘To achieve palm oil conversion along with a high yield of long‐chain alkane,a series of NiFe layered double oxide catalysts were prepared and employed in the deoxygenation of palm oil.The layered structure of these catalysts was confirmed by XRD and SEM analyses,and Ni and Fe species existed primarily in the forms of Ni^(2+)and Fe^(3+),respectively.It was found that Ni/Fe molar ratio influenced the H_(2)reducibility and surface properties of NiFe catalysts.Specifically,Ni_(2)Fe‐LDO and Ni_(3)Fe‐LDO exhibited higher reducibility under H_(2)atmosphere.Moreover,the Ni_(2)Fe‐LDO catalyst contained a higher concentration of surface oxygen species(Osurf).Deoxygenation results demonstrated that the Ni_(2)Fe‐LDO catalyst achieved superior palm oil conversion,higher liquid product yield and enhanced selectivity toward C_(15)–C_(18)hydrocarbons compared to other catalysts.This improved performance was attributed to its higher hydrogen dissociation activity and enhanced adsorption capacity for palm oil molecules.Furthermore,reaction condition studies revealed that palm oil was completely converted,yielding 86.8%liquid product with 81.8%selectivity of C_(15)–C_(18)hydrocarbons at 350℃under 7 MPa H_(2)pressure.This finding provides an insight into the development of efficient catalysts for the deoxygenation of fatty compounds to biofuels.
