基于速度饱和的CMOS倒相器延迟模型

提出了一个新的小尺寸CMOS倒相器延迟模型,它考虑了速度饱和效应以及非阶梯的输入信号对延迟的影响并给出了倒相器快输入响应与慢输入响应的判据,模型计算结果与SPICEBSIM1模型的模拟结果吻合得很好.     

用于彩色电视接收机的数字信号MOS场效应晶体管集成电路

为了调节等距离时间延迟，倒相链提供相同集成电路布局技术的偶数静态倒相器，一个偶数倒相器的输出通过选择转换与信号输出连接，在合适的频率测量周期中，奇数倒相器通过直接将奇数倒相器的输出与第1倒相器输入耦合而连接成环路，而数字测量装置监测来自环的自激振汇 环连部分的时间延迟，测量装置的输出信号用于调节倒相链的时间延迟。     

使用变比例到定比例的方法优化CMOS串联缓冲器链的设计

本文提出了一种新的变比例到定比例(variable to fixed,VF)的CMOS串联缓冲器链的设计方法.这种VF的设计方法考虑了一个由倒相器组成的缓冲器链的初始输入波形斜率对其每一级时延的影响.同时,计算了倒相器的前馈电容对时延的影响.并着重研究了以上因素所导致的缓冲器链前几级的特殊性质,并据此提出了一个考虑初始波形的全局的倒相器链的优化方法.对每个倒相器的输出响应,我们提出了一组解析表达式.理论推导和SPICE的模拟证明,我们的VF设计方法是一个针对时延的最优解,面积相应较小.实验数据显示:与传统的常比例方法相比,可以节省6~10%的时延和30~70%的面积.     

高温CMOS数字集成电路直流传输特性的分析

分析了高温CMOS倒相器和门电路的直流传输特性,建立了相应的解析模型。根据分析,高温MOSFET阈值电压和载流子迁移率的降低,以及MOSFET漏端pn结泄漏电流的增加引起了CMOS倒相器和门电路直流传输特性劣化。在MOSFET漏端pn结泄漏电流的影响下,高温CMOS倒相器和门电路的输出高电平下降,低电平上升,导致了电路的功能失效。给出的理论模型和实验结果一致。     

高压CMOS倒相器

本文介绍一种由高压PMOS器件作负载管和高压NMOS器件作驱动管的高压CMOS倒相器.这种倒相器的输入信号与TTL电平兼容,在50pf的负载下能成功地产生200V、1MH_z的高压脉冲,并能直接驱动等离子显示板或作高压功率开关.     

提供绝对值的电路

这种直接耦合的绝对值电路具有低输入偏流、高输入阻抗和驱动2.5V(50Ω负载)的能力.晶体管Q1对输入进行缓冲来得到高输入阻抗,并通过R_(10).偏移输入电平,以便与大电流增益晶体管Q2以及R_4、R_7、R_8、R_9和R_(11)组成的单位增益例相器的输入相匹配.输入偏流通过R_1和R_2,而不流经输入源.在正输入电压时,Q1、Q3上R_3和R_(10).形成一个零偏置电压跟随器.而倒相器使Q4截止.在负输入电压时,Q3截止,而倒相器通过Q4驱动输出,以至Vout=|Vin|.     

HEMT DCFL倒相器的模拟分析

目前,对HEMT逻辑单元电路的模拟分析基本上是基于SPICE模型,采用曲线拟合及参数提取等方法完成,较难从模拟结果直接获得有关器件物理参数与电路性能指标,给HEMT高速IC逻辑设计带来了困难。本研究进行了HEMT门特性的理论分析,提出了模拟HEMT DCFL倒相器直流传输特性及瞬态特性的新模型,并进行了计算机模拟。 在进行直流传输特性模拟时,讨论了电压传输过程中三个不同的工作区,利用K.Park提出的HEMT I—V特性模型,可得到各区输入与输出电压关系,即可完整地模拟出HEMT DCFL倒相器的直流传输特性,克服了C.H.Hyun模型中仅能模拟过渡区的缺陷。另外,还计算了负载管阈电压和源电阻对传输特性的影响。 Hyun简单地运用了导电机理不同于HEMT的GaAs无栅FET饱和电流表达式计算延迟时间,带来了一定的误差,本研究仍使用K.Park的I—V特性模型计算负载管导通电流,较为正确地计算出延迟时间与驱动管栅宽、负载管阈电压及电源电压的关系。 由于模型将器件的物理参数与电路性能指标有机结合,且较为全面地考虑了影响倒相器特性的诸因素,故较好地指导了HEMT IC的设计。     

BiCMOS倒相器延迟特性的计算与分析

本对ＢｉＣＭＯＳ倒相器延迟特性进行了系统研究，在分析比较ＭＯＳ与双极器件及其组成电路不同状态下的工作特点基础上，得到ＢｉＣＭＯＳ倒相电路在小注入，大注入和集电极寄生电阻等不同限制条件下的延迟时间的解析关系式，结果表明该模型具有近似于ＳＰＩＣＥ数值模拟精度，为各类高性能ＢｉＣＭＯＳ电路的优化设计与分析提供了理论依据。     

BiCMOS例相器延迟特性的计算与分析

本文对ＢｉＣＭＯＳ倒相器延迟特性进行了系统研究，在分析比较ＭＯＳ与双极器件及其组成电路不同状态下的工作特点基础上，得到ＢｉＣＭＯＳ倒相电路在小注入、大注入和集电极寄生电阻等不同限制条件下的延迟时间的解析关系式，结果表明该模型具有近似于ＳＰＩＣＥ数值模拟精度，为各类高性能ＢｉＣＭＯＳ电路的优化设计与分析提供了理论依据．     

MOS集成电路倒相器的特性分析

对金属-氧化物-半导体集成电路倒相器的直流电压传输特性和过渡特性进行了计算。为便于设计应用,结果用图表示出。讨论了传输门的过渡特性和倒相器的速度功耗乘积。     

Analytical transient response and propagation delay evaluation ofthe CMOS inverter for short-channel devices

In this paper an accurate, analytical model for the evaluation of the CMOS inverter transient response and propagation delay for short-channel devices is presented. An exhaustive analysis of the inverter operation is provided which results in accurate expressions of the output response to an input ramp. Most of the factors which influence the inverter operation are taken into account. The α-power law MOS model, which considers the carriers' velocity saturation effects of short-channel devices, is used. The final results are in excellent agreement with SPICE simulations     

Modeling the influence of the transistor gain ratio and theinput-to-output coupling capacitance on the CMOS inverter delay

An improved model for the ramp response of a CMOS inverter has been derived where the influences of the short-circuit current and the input-to-output coupling capacitance are considered. These effects modify the ideal linear relationship between the inverter propagation delay and the input ramp rise/fall time by adding a term proportional to the charge supplied by the short-circuiting transistor. This term is shown to contain first- and second-order contributions of the input ramp rise/fall time where the second-order contribution effectively models the propagation delay roll-off for slow input ramps. Both the first and the second-order effects are found to be affected by the P-to-N-channel gain ratio. The model shows excellent agreement with SPICE level 3 simulations; even when the short-circuiting transistor has a driving capability twice that of the charging/discharging transistor the error in the propagation delay is only about 2% for a slow input ramp (input-to-output slope-ratio at V_DD/2 equal to 1:2)     

基于改进DTC-SVM的永磁同步电机伺服系统研究

传统的永磁同步电机直接转矩控制方法转矩响应速度快,但转矩脉动大、电流脉动大、开关频率不固定。为此,本文在分析了面贴式永磁同步电机数学模型的基础上,提出一种基于改进DTC-SVM的空间矢量脉宽调制直接转矩控制系统。提出基于Simulink的DTC-SVM伺服系统仿真模型。仿真结果表明,整个系统既保持了传统直接转矩控制的响应速度快的优点,又具有定子电流波形畸变小,转矩脉动小,系统工作稳定,抗干扰性能强的优点。     

Control characteristics and speed controller design for a highperformance permanent magnet synchronous motor drive

The theory of vector control is applied to the nonlinear model of a permanent magnet synchronous motor to develop a linear model for controller design purposes. The operation and relevant mathematics of a pseudo-derivative feedback controller are presented. Controller designs for three different speeds are then considered, and a comparative evaluation is made on the basis of their large and small-signal behavior. In order to test the large-signal response, the detailed nonlinear model of the machine and a real-time model of the inverter switches are used. Results indicate that a critically damped design done so as to ensure that all control and power signals never saturate gives an extremely poor result. Much better small and large-signal responses are achieved by avoiding this constraint and using Zener diodes instead to limit the commanded input into the inverter. Two designs using this technique are presented, an underdamped design with low speed overshoot and an overdamped design with no speed overshoot. The response of the underdamped design was much quicker than that of the overdamped. However the overdamped design has application when speed overshoot is intolerable     

基于移相调功串联谐振逆变器动态模型的研究

采用数据采样法建立了基于移相调功串联谐振逆变器的动态模型。并在Simulink环境中,采用FFT算法,仿真得出了逆变器的动态频率特性。两种方法得到的逆变器的模型相一致,从而证明了数据采样法同样可以用于DC-AC逆变器的建模。这里提出的FFT变换法也是建立逆变器模型的一种有力仿真方法。所建立的逆变器模型将为逆变器实际的试验提供了有力的理论指导。     

A boost DC-AC converter: analysis, design, and experimentation

This paper proposes a new voltage source inverter (VSI) referred to as a boost inverter or boost DC-AC converter. The main attribute of the new inverter topology is the fact that it generates an AC output voltage larger than the DC input one, depending on the instantaneous duty cycle. This property is not found in the classical VSI, which produces an AC output instantaneous voltage always lower than the DC input one. For the purpose of optimizing the boost inverter dynamics, while ensuring correct operation in any working condition, a sliding mode controller is proposed. The main advantage of the sliding mode control over the classical control schemes is its robustness for plant parameter variations, which leads to invariant dynamics and steady-state response in the ideal case. Operation, analysis, control strategy, and experimental results are included in this paper. The new inverter is intended to be used in uninterruptible power supply (UPS) and AC driver systems design whenever an AC voltage larger than the DC link voltage is needed, with no need of a second power conversion stage     

一种基于Buck变换的新型逆变器

文中提出一种基于Buck变换的新型逆变方法,通过DC-DC变换实现逆变器的正弦波形输出,分析了电路的工作原理,并研究了该逆变器的控制策略、抗扰动性能、负载特性和动态响应特性等,仿真和实验结果表明,采用误差反馈PD控制,逆变器在输入直流电压或负载电流出现扰动时输出电压能保持动态稳定,且具有良好的负载外特性.与传统桥式逆变器相比具有低开关损耗、低成本等优点.     

A describing function for resonantly commutated H-bridge inverters

The paper presents the derivation of a describing-function to model the dynamic behavior of a metal oxide semiconductor field effect transistor-based, capacitively commutated H-bridge, including a comprehensive explanation of the various stages in the switching cycle. Expressions to model the resulting input current, are also given. The derived model allows the inverter to be accurately modeled within a control system simulation over a number of utility input voltage cycles, without resorting to computationally intensive switching-cycle level, time-domain SPICE simulations. Experimental measurements from a prototype H-bridge inverter employed in an induction heating application, are used to demonstrate a high degree of prediction accuracy over a large variation of load conditions is possible using the simplified model.     

A High-Frequency Resonant Inverter Using Current-Vector Control Scheme and Its Performance Evaluations

The authors introduce a new configuration of resonant-type high-frequency inverter having inherent fast control response of the output power and variable-voltage variable-frequency (VVVF) capability. The circuit is composed of a parallel combination of two series-resonant inverters with common input and output terminals. Both inverter units are operated at synchronous frequency and with an adjustable phase difference from 0° to 180°, allowing control of the output power from full to null power, respectively. Operation of this inverter is explained and computer-simulated operating waveforms and characteristic curves are shown in terms of normalized control variables and circuit parameters. A prototype inverter using Power MOSFET modules has been originally tested with a high-frequency induction heating and melting load to demonstrate experimentally the proposed control principle and the steady-state inverter performances under parallel tuned load conditions.     

Input characteristics of variable modulation index controlled current source inverters

Standard PWM current source inverters (CSIs) usually operate at fixed modulation index. The proposed modified current source inverter (MCSI) can operate with most pulse width modulation (PWM) techniques and with a variable modulation index, since the DC link inductor current freewheels on itself and not through the CSI. The use of variable modulation index control results in faster response times with no penalty on input power factor as compared to other variable modulation index schemes. This paper confirms this by investigating the input characteristics of the MCSI as seen from the AC mains. The quality of the input AC line currents is examined, and a design procedure for the input filters is given. Power factor and efficiency are discussed. Results are compared to those of other current source inverter topologies. Experimental results obtained from a 5 kVA converter confirm the theoretical considerations.<>