双向同步整流BUCK-BOOST数字电源设计

采用同步BUCK电路和同步BOOST电路级联而成的同步整流BUCK-BOOST电路拓扑,基于STM32F334高性能32位ARM Cortex-M4 MCU构建能量实现的双向流动,并能在同一方向实现升降压功能的数字电源.     

亚超声遥控开关

本文所介绍的遥控开关具有对室内照明灯及用电器进行遥控之功能。当需要接通或断开室内照明或其它电器电源时,只需用手握一下小胶皮囊即可达到遥控目的。一、电路基本原理整机由电源电路,接收放大电路及双稳触发开关电路三部分组成,如图1所示。220V交流电通过电容C_1降压,VD_1～VD_4组成的桥式整流,C_2、R_2、C_4滤波,输出10～12V的直流电压,为后级电路提供的工作电源。     

PDP电视机多制式数字视频信号转换电路的研究

本文介绍了PDP电视机中多制式数字视频信号转换电路的设计方案。其主要功能是对模拟视频信号进行解码和数字化,并作隔行/逐行转换、尺度变换、帧频转换等处理,同时为PDP整机提供行、场同步信号以及消隐和时钟信号等。     

基于单向耦合法的不确定复杂网络间有限时间同步

针对具有不确定性的复杂网络有限时间同步问题, 提出一种新颖的单向耦合控制方法. 构建含有未知参量及未知拓扑结构的驱动?响应复杂网络模型, 考虑两个网络具有不同的节点数, 同时受到时变耦合时滞的影响, 并且网络内部分别具有不同的节点系统. 基于有限时间稳定性理论和线性矩阵不等式变换, 通过在响应网络中引入单向耦合项, 实现两个网络间的有限时间同步, 同时准确辨识未知参量及未知拓扑结构. 仿真实验验证所提同步方法的有效性, 对比实验结果表明所提方法在减少耦合数量的同时具有更快的同步速率及更小的波动范围.     

基于低功率PIC16F887单片机的控制系统抗干扰能力改进

针对基于低功率PIC16F887单片机控制系统的电磁干扰问题,设计了一种稳定的电容降压电源电路.通过电快速瞬变脉冲群(EFT/B)试验,测试了PIC16F887单片机在不同电源等级中的抗电磁干扰能力,提出了采用两级稳压电路增强电源端抗干扰能力的方法并设计了电路.实验结果表明,低功率PIC16F887单片机控制系统在电容降压电路中能稳定工作,5V系统中的EFT/B抗干扰能力要强于3.3V系统,电源端抗EFT干扰能力达到IEC61000-4-4严酷等级第4级的要求.     

应用于矿用电机车的并联交错DC/DC变换器研究

针对目前应用于矿用电机车的非隔离型变换器转换效率低、易损坏开关器件、不适用于超级电容等问题,介绍了一种应用于矿用电机车的并联交错DC/DC变换器。在低压侧采用并联交错结构对电容充电,并减小电流纹波;在高压侧通过增加一个开关管使2个电容串联放电,以提高升降压增益。介绍了该变换器在升压驱动模式和降压充电模式下的工作过程,并设计了电压/电流双闭环升压和恒流限压充电控制器。实验结果表明,并联交错DC/DC变换器能够有效提高电机车在直流变换环节的性能。     

低功耗电荷泵 DC/DC 升压电路设计

电源管理芯片的应用范围十分广泛,发展电源管理芯片对于提高整机性能具有重要意义,对电源管理芯片的选 择与系统的需求直接相关。其中电荷泵电路通过电荷转移方式工作,来达到在无电感元件情况实现一定升压,因此该升 压电路和该款电源管理芯片在应用中很受欢迎。该设计分析的低功耗电荷泵 DC/DC 升压电路是同国外某公司的合作项 目。该电路采用 0.35 μm 标准的 CMOS 工艺制成,输入电压在 2.5 V～5.0 V,且输入电压高于或低于输出电压时,输出 电压都可保持稳定的低纹波输出,并能自动工作于升压或降压模式。该电荷泵电路采用比较升压电路,有效的降低了芯 片功耗,特别在轻负载情况下提高了系统的转换效率。电路还具有软启动、过热保护及过流保护等多重保护功能。仿真 结果均达到预定指标,是设计理论与实践相结合的一次有价值的尝试。     

基于自适应并联电感同步开关控制的压电能量俘获电路设计

并联电感同步开关（P-SSHI）电路可以提高压电能量俘获能力,但其能量俘获效率受到开关控制精准性、整流电路导通压降等因素的影响。因此,本文提出了一种将超低压降有源整流与自适应P-SSHI结构相结合的高效压电能量俘获电路。其中,超低压降有源整流的上半桥采用交叉耦合被动开关的PMOS对管结构,下半桥则采用有源电路控制开关的NMOS对管结构,从而有效地降低了整流电路的导通压降。为进一步提高电路的压电俘获效率,本文采用自适应同步开关控制的P-SSHI结构以提高开关控制的精准性。该结构通过对整流电路中的电流进行过零检测确定同步开关的闭合时刻,对L-C振荡回路中的电流进行过零检测确定同步开关的断开时刻。实验结果表明,所提电路可以实现同步开关的自适应控制,并可有效提高压电能量俘获电路的整体效率。与全桥整流电路相比,本文所提电路可将输出功率提高到235%。     

基于Proteus软件的直流变换电路分析研究

直流变换电路在电力电子技术中应用非常广泛。降压斩波电路和升压斩波电路是直流变换电路中最常用的两种电路。本文运用Proteus软件搭建了仿真电路模型,通过改变电路的元件类型和参数,分析其对输出电压的影响,从而为具体的工程实践应用提供一种新的研究思路。     

一种新型单级PFC研究

提出了一种新型单级功率因数校正AC/DC变换器,给出了电路的拓扑结构,分析研究了这种变换器的各种工作模式。实验结果表明,这种变换器具有电路拓扑简单,功率密度高,功率因数高,成本低等优点。     

Design of a non-inverting synchronous buck-boost DC/DC power converter with moderate power level

This paper presents the design of a non-inverting synchronous buck-boost DC/DC power converter with moderate power level for a solar power management system. The buck-boost requirement arises from the rapid changes in the atmospheric condition or the sunlight incident angle. The system mainly consists of the non-inverting synchronous buck-boost DC/DC power converter, MOSFET drivers, anti-cross conduction logic circuitry, feedback compensator, and PWM regulator. The system is capable of converting the supply voltage source to higher and lower voltages to the load terminal with voltage polarity unchanged. The voltage at the load terminal is controlled by continuously adjusting the duty cycle of the PWM regulator. Application of the buck-boost converter in battery management system design is also addressed.     

Intrinsic Power Management Strategy based improvement of power stability in a single-phase AC–DC converter system

Nowadays the size of the use of electronic devices like laptops, cell phone chargers, electric vehicles and UPS is rapidly increasing. So AC–DC converters need to incorporate the power factor correction along with voltage regulation. There are many AC–DC converter control methods available, but these methods do not perform well. Therefore In this paper, a smooth transformation on switching will be characterized by a high power factor in a single phase AC–DC converter by the use of intrinsic power management strategy. The proposed AC–DC converter's circuit topology is obtained by integrating a boost and buck converter. The Boost Converter's switching frequency does power factor correction to get less current harmonics at the input line. In this single phase AC–DC converter, the buck-boost converter is an important component that increases system power quality based on advanced PWM technique. So in this work, the Intrinsic Power Management Strategy (IPMS) is proposed to enhance the control over the DC–DC converter performance during unstable or transient operation. Rather than making a quick Pulse Width Modulation (PWM) signal, the computerized signal processor just creates a moderate changing DC signal to decide the PWM ramp function. The power factor correction model has been created and simulated by utilizing MATLAB programming. The simulation model demonstrates that the power factor is improved and the converter has regulated DC output voltage. To validate this simulation, a 1000 W prototype converter has been developed to feed a DC motor and the analysis of the results are presented.     

混沌态电流模式Buck-Boost开关变换器的OGY控制

从电流模式Buck-Boost开关变换器周期 1状态的频闪采样离散时间迭代映射数学模型出发，提出了一种混沌态电流模式Buck-Boost开关变换器吸引子中不稳定周期 1轨道的确定方法．根据OGY控制的原理和思想，推导出OGY控制矢量的取值范围，以此为依据选择控制矢量，实现了对混沌态的电流模式Buck-Boost开关变换器相空间中的一条不稳定周期 1轨道的稳定控制．     

Modeling and Design of High Performance Converters for Optimal Utilization of Interconnected Renewable Energy Resources to Micro Grid with GOLRS Controller

This paper proposes a bidirectional Z-source dc-dc converter topology for the optimal utilization of renewable energy sources to the microgrid with the proposed control technique. Compared to the existing dc-dc converter circuits, they can reduce in-rush and harmonic current, provide larger range of output dc voltage and improve reliability. It can operate in voltage-fed and current-fed when the place of the source and load is exchanged each other, and it can be perform buck-boost function in these two conditions. Its power flow can be bidirectional. The bidirectional Z-source dc-dc converter is revealed with the consideration of enhanced converter efficiency, effective utilization of renewable energy sources and reduced switching losses. The proposed control technique is the combination of both the grasshopper optimization algorithm (GOA) and local random search (LRS) and hence it is known as GOLRS controller. Here, the searching behaviour of the GOA is enhanced by LRS with the help of two operators named as crossover and mutation. In the proposed technique, the GOLRS is used to generate the optimal gain dataset based on the minimum error objective function and select the exact gain parameter of the PI controller. Batteries are used as an energy source to balance out and allow the renewable power system units to continue running at a steady and stable output power. The proposed technique is executed in the MATLAB/Simulink working platform and compared with various existing techniques.

     

基于FTC的BBMC调速控制策略及参数优化

针对以Buck-boost矩阵变换器(BBMC)为功率变换器的异步电机调速系统, 提出一种基于有限时间控制(FTC)的变频调速控制方法.首先根据异步电机的给定转速, 经基于PI-IP控制的矢量控制算法获得BBMC的参考输出电压; 再以BBMC中电容电压与电感电流作为系统控制变量, 经有限时间控制算法得到BBMC中对应功率开关的占空比; 再根据该占空比对BBMC中对应功率开关实施控制, 即可在BBMC输出端获得与其参考输出一致的输出电压, 从而实现异步电机实际转速对其给定转速的准确跟踪, 达到对异步电机转速进行准确控制的目的; 同时采用自适应狼群优化算法对BBMC主电路参数及基于有限时间的控制参数进行优化, 取得了满意的效果.最后通过仿真和实验对上述控制方法进行了验证.     

新颖交流开关稳压电源的设计和仿真

设计了一种新颖的交流开关稳压电源。采用直接的“交流／交流”变换和PWM反馈控制电路。电路结构简单．性能可靠。仿真结果表明，此电路稳压效果较好，具有很高的效率。     

大容量锂电池化成设备的DC＼DC变换器设计

电池化成作为电池生产过程中的关键工序关系到电池的特性和质量,并直接影响电池的生产成本。本文针对大容量锂离子电池化成设备,设计了一种低压大电流DC／DC升降压变换器。主要包括电路基本拓扑结构选择、反馈模块设计和外围控制电路设计。详细介绍了PWM驱动电路的设计及高频变压器参数的选择与计算。通过实际样机测试,表明该DCYDC变换器充放电效率分别可达75％和74％,且具有工作稳定、体积小、重量轻等优点。     

一种新型的交流稳压电源

提出一种新型的交流稳压电源，采用直接的“交流，交流”的变换电路和PWM控制。该稳压电源电路简单可靠、稳压性能好．对由高次谐波产生的纹波亦有很好的抑制作用。     

A Generalized State Space Average Model for Parallel DC-to-DC Converters

The high potentiality of integrating renewable energies, such as photovoltaic, into a modern electrical microgrid system, using DC-to-DC converters, raises some issues associated with controller loop design and system stability. The generalized state space average model (GSSAM) concept was consequently introduced to design a DC-to-DC converter controller in order to evaluate DC-to-DC converter performance and to conduct stability studies. This paper presents a GSSAM for parallel DC-to-DC converters, namely: buck, boost, and buck-boost converters. The rationale of this study is that modern electrical systems, such as DC networks, hybrid microgrids, and electric ships, are formed by parallel DC-to-DC converters with separate DC input sources. Therefore, this paper proposes a GSSAM for any number of parallel DC-to-DC converters. The proposed GSSAM is validated and investigated in a time-domain simulation environment, namely a MATLAB/SIMULINK. The study compares the steady-state, transient, and oscillatory performance of the state-space average model with a fully detailed switching model.     

可调直观式直流稳压电源设计方案

本文设计一个可调可直观显示的直流稳压电源,电路采用三端可调式集成稳压器LM317等元件,构成从OV～20V连续可调的稳压电源电路,同时利用模数（A／D）转换,单片机控制电路,通过译码驱动,实现在数码管上直观显示瞬时电压数值。具有设计电路简单,制作容易,操作方便,显示直观,性能可靠,功能完善等特点。