PWM开关功率变换器闭环系统数值仿真的一种方法

提出了ＰＷＭ开关功率变换器闭环系统分阶段数值仿真的一种方法。将主电路及控制电路作为一个统一的整体,建立闭环系统各子拓扑的线性状态微分方程,使各拓扑切换时刻的确定变得非常简单且提高了仿真效率。     

MATLAB与PSPICE相结合用于开关功率变换器仿真的方法

阐述了将ＭＡＴＬＡＢ与ＰＳＰＩＣＥ相结合用于开关功率变换器仿真的方法,着重服如何用ＭＡＴＬＡＢ语言读取ＰＳＰＩＣＥ仿真所得数据,给出了实例说明及程序。     

开关磁阻电动机新型功率变换器及仿真分析

提出了一种通过ＤＣ／ＤＣ变换器以在磁阻电动机绕组放电电流进行回馈的新型功率变换器,详细分析了其对系统性能的影响,并与传统的功率变换器作了比较,仿真计算了每种功率变换器下的系统输出电流及转矩波形,证实了该功率变换器对提高系统输出功率、减小转矩波动的有效性。     

PWM开关变换器分析方法综述

本文对PWM开关变换器的各种分析方法作了较为详细的介绍及评述，着重介绍了连续解析法．最后总结了开关变换器分析方法的发展趋势。     

零转换PWM变换器仿真研究

开关电源的核心为直流变换器,其性能决定了开关电源的优劣.传统的直流变换器开关管电压应力和开关损耗较大,影响到了开关管的安全工作,造成的电磁干扰较严重,使得开关电源的应用场合受到了限制.文中采用主、辅软开关技术设计了一种零转换PWM变换器.仿真研究表明,实现的变换器开关管电压应力和开关损耗较小,主开关电压幅度为30.498 V,平均损耗功率峰值为75 W.当调整主、辅开关管的控制信号相位差为2 μs时,电路达到最佳工作状态,开关损耗达到最小,变换器效率最高.     

自激式半桥零电压开关PWM变换器

提出了零电压开关变换的一种新型自激ＰＷＭ变换器，它完全摒弃了依靠变压器磁化曲线形成状态转换的传统方式。通过加入熄火区间实现了开关功率器件的零电压开通与关断。     

开关磁阻电动机与功率变换器

分析开关磁阻电动机的功率变换器电路，介绍开关磁阻电动机基本运行方式中，功率变换器的驱动控制过程。     

新型ZCT软开关PWM变换器的研究

本文提出了一种新型的ZCT软开关变换器,主管为零电流关断,辅助管为零电流通断,特别适用于IGBT作为开关器件的高电压、大功率应用场合。通过理论分析、参数选择、电路仿真和实验结果加以说明。     

电流模式PWM控制IGBT全桥功率变换器

对于一种新型的电流模式ＰＷＭ控制的３０ｋＷ全桥拓扑ＤＣ／ＤＣ功率变换充电器进行了研究开发。功率变换器采用ＮＰＴ－ＩＧＢＴ器件,无需串联隔直防偏磁电容,使用有源斜坡补偿技术,效率达到９０％,具有极好的动态响应、过流诼模块均流并联性能,是一种具有功率扩容（可达１００ｋＷ）潜力并易于工程化实现的ＩＧＢＴ功率变换器。     

三电源供电系统快速切换方案与仿真分析研究

快速切换装置是保证连续生产企业供电系统供电连续可靠性的重要措施。提出了三电源供电系统带有保安电源的特殊性和重要性,分析了该三电源系统的备自投切换方式,并提出快速切换方案。介绍了快切装置的基本原理与判据,并对三电源供电系统切换过程进行了仿真分析。仿真结果验证了快速切换装置对三电源系统连续供电的可行性。     

新型恒功率输出开关变换器控制策略的研究

面向高强度气体放电灯，提出一种新型恒功率输出控制策略，详细分析了它的电路组成和工作原理，并以其在单端反激式DC／DC变换器的应用为例加以实验验证。在其后级加一低频全桥开关变换器，可作为交流高强度气体放电灯的工作电源，能与高强度气体放电灯的不同阶段的不同负载特性良好匹配。     

测试设备中开关功率变换器工作稳定性研究

为提高测试设备中开关功率变换器的工作稳定性,以电压模式控制的Buck变换器为研究对象,分析了该变换器的工作过程,建立了相应的数学模型,并对该模型进行数值仿真,发现该变换器存在复杂的动力学行为,导致系统工作的不稳定性.理论分析得出不稳定现象的本质原因,通过电路实验来验证这种现象的真实性.数值仿真,理论分析,实验验证一致表...     

Optimal switching Lyapunov‐based control of power electronic converters

This paper presents new ideas and insights towards a novel optimal control approach for power electronic converters. The so‐called stabilizing or Lyapunov‐based control paradigm is adopted, which is well known in the area of energy‐based control of power electronic converters, in which the control law takes a nonlinear state‐feedback form parameterized by a positive scalar λ . The first contribution is the extension to an optimal Lyapunov‐based control paradigm involving the specification of the optimal value for the parameter λ in a typical optimal control setting. The second contribution is the extension to more flexible optimal switching‐gain control laws, where the optimal switching surfaces are parameterized by a number of positive scalars λ _j . Systematic derivation of gradient information to apply gradient‐descent algorithms is provided. The proposed techniques are numerically evaluated using the exact switched model of a DC–DC boost converter. Copyright © 2016 John Wiley & Sons, Ltd.     

Circuit theory of power factor correction in switching converters

This paper discusses the circuit theory aspects of power factor correction in switching converter circuits. The discussion begins with an examination of the requirement of power factor correction in dc/dc converters. Using the concept of zero‐order converter circuits, sufficient conditions for a dc/dc converter circuit to provide power factor correction are derived. The duality principle is applied to generate new converter circuits that can achieve power factor correction. The practical application of power factor correction is considered in conjunction with the requirement of tight output voltage regulation. Detailed study of the circuit configuration that can simultaneously provide power factor correction and output regulation is given. Based on a general three‐port model, the voltage regulator with power factor correction capability is studied in terms of the power flow between the input port, output port and energy storage port. A detailed consideration of the power flow among the three ports leads to the derivation of all possible minimal configurations that can achieve power factor correction and voltage regulation. The efficiencies of these minimal configurations are studied theoretically, leading to the concept of ‘reduced redundant power processing’ which provides important clue to efficiency improvement. Another issue addressed in this paper is the synthesis of practical circuits that can provide power factor correction and output regulation. In particular, four practical minimal configurations that achieve reduced redundant power processing are considered. A systematic synthesis procedure is derived for creating converter circuits that achieve power factor correction and output voltage regulation. The control issue is also investigated in depth, pinpointing the basic requirement on the number of control parameters needed and its relationship with the operating mode. Copyright © 2003 John Wiley & Sons, Ltd.     

一种基于PWM的推挽式开关电源的研究

介绍了集成芯片SG3525的特点和主要功能,给出了由SG3525组成的推挽式开关电源的系统结构设计,用实验数据和结果说明设计的可行性。     

A saturable reactor-assisted soft switching PWM DC-DC converter

Owing to the demand to increase the power density of switched-mode power converters, resonant topologies have attracted much attention because of their low switching losses and low EMI. However, they require relatively large resonant components and necessitate high current or voltage ratings at semiconductor devices. This paper describes a new soft-switching PWM full-bridge DC-DC converter which can overcome these drawbacks by utilizing a small saturable reactor. The principles of operation and the steady-state characteristics are illustrated and the role of the saturable reactor is discussed. Moreover, the voltage and current stresses for active and passive components are also presented. To verify the results, experiments were performed with a 350 W, 500 kHz prototype converter. They demonstrated that the converter achieves soft switching in a wide load range with no substantial increase in voltage and current stresses on active and passive components.     

一种低输入电压开关电源的设计

介绍了一个输入电压较低、采用推挽拓扑开关电源的设计,给出了主变压器的设计过程和功率开关MOSFET及输出整流二极管的选择方法。     

Exact and explicit expressions for the small‐signal dynamics and frequency response of switching converters

In this paper, exact and explicit expressions for the dynamics and small‐signal responses of piecewise linear switching converters are derived. The results are very useful for the exact simulation and analysis of converter circuits. These expressions can also be used to develop simplified (approximate) models of converters for practical design purposes. An example is given to show that the well‐known state‐space averaging model is in fact the first‐order approximation of our exact model. Copyright © 2004 John Wiley & Sons, Ltd.