为解决电压型控制伪连续导电模式(pseudo continuous conductionmode, PCCM)单电感双输出(single-inductor dual-output,SIDO) Buck变换器输出支路存在交叉影响、负载瞬态响应慢等问题,提出一种输出支路无交叉影响、负载瞬态响应速度快...为解决电压型控制伪连续导电模式(pseudo continuous conductionmode, PCCM)单电感双输出(single-inductor dual-output,SIDO) Buck变换器输出支路存在交叉影响、负载瞬态响应慢等问题,提出一种输出支路无交叉影响、负载瞬态响应速度快的V2控制PCCM SIDO Buck变换器技术。首先,阐述V2控制PCCM SIDO Buck变换器的基本工作过程,建立实际电路参数下V2控制和电压型控制PCCM SIDO Buck变换器的小信号模型,利用波特图对比分析2种控制方法的负载瞬态性能和交叉影响特性;然后,建立V2控制PCCM SIDO Buck变换器的采样数据模型,通过对平衡点处的雅克比矩阵及其特征值进行分析,得到电路参数变化时变换器的状态区域分布图,为电路参数的设计提供理论指导;最后,搭建实验平台,并验证所提理论的正确性。理论和实验结果表明,相较于电压型控制,V2控制PCCM SIDO Buck变换器的输出支路间交叉影响为零,且负载瞬态响应速度更快。展开更多
随着呼吸与危重症医学科(pulmonary and critical care medicine,PCCM)的发展,要求PCCM的住院医师成为临床与科研紧密结合的复合型人才,他们除了需要具备扎实的临床理论知识、熟练的临床操作技能外,还需要具有严谨的科研能力。浙江大学...随着呼吸与危重症医学科(pulmonary and critical care medicine,PCCM)的发展,要求PCCM的住院医师成为临床与科研紧密结合的复合型人才,他们除了需要具备扎实的临床理论知识、熟练的临床操作技能外,还需要具有严谨的科研能力。浙江大学医学院附属第一医院PCCM作为我国住院医师规范化培训基地,本文调查了本院PCCM住院医师的科研现状,发现了一系列的问题如住院医师自身对科研培训的意识度薄弱,且部分带教教师从未经历过系统的科研训练,使得住院医师的科研培训工作很难开展。针对上述问题,制定了一套解决方案,包括培养住院医师文献阅读能力和科研选题能力、推行科研导师制以及采用多元化教学模式并完善住院医师的科研考核标准,力求提升PCCM住院医师科研能力和素养,为住院医师的个人发展奠定一定的科研基础。展开更多
An analog implementation of a novel fixed-frequency quasi-sliding-mode controller for single-inductor dual-output（SIDO） buck converter in pseudo-continuous conduction mode（PCCM） with a self-adaptive freewheeling c...An analog implementation of a novel fixed-frequency quasi-sliding-mode controller for single-inductor dual-output（SIDO） buck converter in pseudo-continuous conduction mode（PCCM） with a self-adaptive freewheeling current level（SFCL） is presented.Both small and large signal variations around the operation point are considered to achieve better transient response so as to reduce the cross-regulation of this SIDO buck converter.Moreover,an internal integral loop is added to suppress the steady-state regulation error introduced by conventional PWM-based sliding mode controllers.Instead of keeping it as a constant value,the free-wheeling current level varies according to the load condition to maintain high power efficiency and less cross-regulation at the same time.To verify the feasibility of the proposed controller,an SIDO buck converter with two regulated output voltages,1.8 V and 3.3 V,is designed and fabricated in HEJIAN 0.35 m CMOS process.Simulation and experiment results show that the transient time of this SIDO buck converter drops to 10 s while the cross-regulation is reduced to 0.057 mV/mA,when its first load changes from 50 to 100 mA.展开更多
文摘为解决电压型控制伪连续导电模式(pseudo continuous conductionmode, PCCM)单电感双输出(single-inductor dual-output,SIDO) Buck变换器输出支路存在交叉影响、负载瞬态响应慢等问题,提出一种输出支路无交叉影响、负载瞬态响应速度快的V2控制PCCM SIDO Buck变换器技术。首先,阐述V2控制PCCM SIDO Buck变换器的基本工作过程,建立实际电路参数下V2控制和电压型控制PCCM SIDO Buck变换器的小信号模型,利用波特图对比分析2种控制方法的负载瞬态性能和交叉影响特性;然后,建立V2控制PCCM SIDO Buck变换器的采样数据模型,通过对平衡点处的雅克比矩阵及其特征值进行分析,得到电路参数变化时变换器的状态区域分布图,为电路参数的设计提供理论指导;最后,搭建实验平台,并验证所提理论的正确性。理论和实验结果表明,相较于电压型控制,V2控制PCCM SIDO Buck变换器的输出支路间交叉影响为零,且负载瞬态响应速度更快。
文摘随着呼吸与危重症医学科(pulmonary and critical care medicine,PCCM)的发展,要求PCCM的住院医师成为临床与科研紧密结合的复合型人才,他们除了需要具备扎实的临床理论知识、熟练的临床操作技能外,还需要具有严谨的科研能力。浙江大学医学院附属第一医院PCCM作为我国住院医师规范化培训基地,本文调查了本院PCCM住院医师的科研现状,发现了一系列的问题如住院医师自身对科研培训的意识度薄弱,且部分带教教师从未经历过系统的科研训练,使得住院医师的科研培训工作很难开展。针对上述问题,制定了一套解决方案,包括培养住院医师文献阅读能力和科研选题能力、推行科研导师制以及采用多元化教学模式并完善住院医师的科研考核标准,力求提升PCCM住院医师科研能力和素养,为住院医师的个人发展奠定一定的科研基础。
基金Project supported by the National Natural Science Foundation of China (No.60906012)the Analog Devices,Inc.(ADI)
文摘An analog implementation of a novel fixed-frequency quasi-sliding-mode controller for single-inductor dual-output（SIDO） buck converter in pseudo-continuous conduction mode（PCCM） with a self-adaptive freewheeling current level（SFCL） is presented.Both small and large signal variations around the operation point are considered to achieve better transient response so as to reduce the cross-regulation of this SIDO buck converter.Moreover,an internal integral loop is added to suppress the steady-state regulation error introduced by conventional PWM-based sliding mode controllers.Instead of keeping it as a constant value,the free-wheeling current level varies according to the load condition to maintain high power efficiency and less cross-regulation at the same time.To verify the feasibility of the proposed controller,an SIDO buck converter with two regulated output voltages,1.8 V and 3.3 V,is designed and fabricated in HEJIAN 0.35 m CMOS process.Simulation and experiment results show that the transient time of this SIDO buck converter drops to 10 s while the cross-regulation is reduced to 0.057 mV/mA,when its first load changes from 50 to 100 mA.
