两种状态平均法在功率变换器建模的应用比较

以buck变换器为对象,采用广义状态平均法建立功率变换器广义状态空间平均模型,并与状态空间平均法进行对比.用MATLAB软件对两种方法建立的模型进行仿真,仿真结果与用MATLAB/PSB建立的电路精确模型和实际电路输出结果进行比较.得出结论:状态空间平均法适于研究直流分量占主要成分,电路各量变化波动不大的变换器电路.广义状态平均法不仅可以反映电路各量的直流成分,也能反映出其交流成分,对于研究类似谐振变换器或波动较大的变换器电路,非常有效.     

闭环具有锯齿特性的PWM型DC-DC buck变换器周期解的存在性

应用周期方程方法研究具有锯齿波特性的闭环PWM型buck DC-DC变换器T周期解的存在性问题, 并给出了其在一个周期内仅有一次切换的T周期解存在的充分条件. 所给出的结果为闭环PWM型buck DC-DC变换器的控制器和锯齿波参数的设计提供了指导准则.     

电压型Buck电路控制器的复频域设计及仿真研究

通过分析电压型Buck电路控制器,在复频域下用模拟和数字两种方法对Buck变换器的补偿网络进行了设计.应用PSpice软件建立了系统的模拟电路模型,对系统的频率特性进行了仿真,并用Mathcad仿真软件对复频域下系统连续模型的频率特性进行了验证.然后运用根轨迹理论讨论了一种基于根轨迹和零极点配置的数字控制器设计方法,根据系统性能指标设计了补偿网络,并用Matlab仿真软件对控制系统离散数学模型进行了特性仿真.仿真结果表明用该方法所设计的控制器性能与模拟电路建立的控制器性能完全相同.经过离散化的控制器数学模型可以方便地在DSP等数字信号处理器上实现,为开关变换器的数字化控制提供了简便的实现方法.     

基于DSP28035的风能控制器设计

针对小型离网型风力发电机的特点,设计了2kW风能控制器对蓄电池进行有效的充电管理。控制器的特点是采用了触摸屏对控制器参数进行设置、修改并实时显示。在设计中采用TI公司的DSP28335进行控制器主电路的控制,通过buck电路对蓄电池进行三阶段充电。通过AT89S51单片机控制触摸屏,实现对控制器参数的设定、显示和DSP之间的通信。通过实验证明,该控制器设计新颖,通过智能化三阶段蓄电池充电管理,提高蓄电池的充电效率,有效延长蓄电池使用寿命。     

单原边绕组双输入直流变换器的解耦控制

研究直流变换器的优化设计问题,对具有耦合系统的隔离型多输入变换器进行闭环设计,为了提高效率,减少漏感,需要运用合理的解耦方法去除环路之间的相互耦合.以双输入为例阐述了单原边绕组隔离型双输入buck变换器的双环控制策略及其闭环设计.运用空间状态平均法对变换器进行建模,得到系统的小信号数学模型控制对输出的传递函数矩阵,同时为了能够单独设计各个环路的控制器,通过对矩阵进行变换而加入了一个解耦网络.仿真结果证明,设计的闭环直流变换器是正确的.     

一种新型交错并联型buck变换器

通过传统buck变换器的三端口网络模型中引入一个开关电容,得到了一种新型带开关电容交错并联buck变换器。通过对新型变换器进行理论分析可知,与传统buck变换器相比,当占空比D<0.5时,新型变换器不仅输出电流纹波减小,且在相同占空比下实现了更高的电压增益;同时开关管的电压应力减小,其电流应力均为输出电流的一半,有利于器件的选择和散热。因此新型变换器非常适合于低输出电压、大电流的场合及输入、输出电压相差较大的系统。最后通过仿真验证了理论分析正确性。     

热电制冷器的模糊PID恒温控制器的研制

本文介绍了一种利用ARM、改进的buck变换器和数字温度传感器DS18B20,采用模糊PID控制算法构成的恒温控制器。该控制器所控温度与环境温差最大可达30°C,所控温度精度达±0.5°C。     

基于FPGA控制的双有源桥DC-DC变换器仿真实验平台设计

介绍了一种基于FPGA控制的逆变器仿真实验平台设计。该设计运用半实物仿真技术,在FPGA中虚拟出双有源桥DC-DC变换器（DAB）有关的实验平台,由FPGA、DSP和上位机三部分组成。FPGA采用SparkRoad FPGA,用来在内部虚拟出一个DAB变换器电路,接收控制器发来的信号,处理仿真器内部信息,最后将结果上传至上位机系统;DSP采用TMS320F28335,用来产生模拟DAB变换器电路中的IGBT开关信号,并将开关信号以PWM波的方式传给FPGA进行处理;上位机采用的是个人电脑,用来与另外两部分进行串口通信。通过性能测试,该设计达到了预期的功能。     

基于传输线模型的开关变换器数字仿真

瞬变过程和动态特性分析在开关变换器的研究设计中占有重要地位.阐述了一种以传输线理论为基础的开关变换器离散数字建模方法-传输线建模方法及其无条件数值稳定性,以Boost变换器为例建立了仿真模型,并对仿真和实验结果进行了比对.仿真结果精确地描述了实际电路的动态过程,在步长从0.02μs到0.2μs范围内变化时,结果保持稳定.这种方法简单实用,物理概念清晰,能有效地对开关变换器进行仿真研究.     

基于MATLAB的Buck直流变换器的仿真研究

本文简单介绍了Buck直流变换器的工作原理,且应用Matlab仿真软件对该电路进行了建模和仿真。在仿真过程中,通过改变触发脉冲的占空比,从而改变变换器的输出电压、电流,与理论分析结果进行比较。     

非理想Buck变换器的建模及仿真

针对以往开关变换器建模过程中一些理想化假设会引起较大误差的问题,为系统预测的稳定性,以Buck变换器为例,采用状态空间平均法建立在非理想条件下的数学模型,并利用MATLAB软件对模型进行仿真,仿真结果与理想模型和Buck变换器实际电路模型的输出波形进行对比分析,非理想模型的仿真波形和实际电路模型的波形基本一致。结论表明建立的非理想Buck变换器状态空间数学模型具有合理性和可行性,在PWM DC-DC开关变换器的建模分析中考虑寄生参数的实用性更强。     

一种两级式LED恒流驱动电源设计

根据LED驱动电源设计要求,对设计方案进行合理论证,前级功率因素校正采用升压型斩波电路,控制芯片采用仙童公司的FAN7527,后级采用隔离式单端反激电路实现降压型DC/DC变换,控制芯片为TI公司的UC3843;此外为满足LED驱动电源恒流输出特性,设计中采用AP4310设计一个恒流限压控制器。基于以上结构,完成一款实验样机,通过测试和分析,实验波形与理论波形基本一致,完成本次设计要求的性能指标。     

Closed-loop analysis and control of a non-inverting buck–boost converter

In this article, a cascade controller is designed and analysed for a non-inverting buck–boost converter. The fast inner current loop uses sliding mode control. The slow outer voltage loop uses the proportional–integral (PI) control. Stability analysis and selection of PI gains are based on the nonlinear closed-loop error dynamics incorporating both the inner and outer loop controllers. The closed-loop system is proven to have a nonminimum phase structure. The voltage transient due to step changes of input voltage or resistance is predictable. The operating range of the reference voltage is discussed. The controller is validated by a simulation circuit. The simulation results show that the reference output voltage is well-tracked under system uncertainties or disturbances, confirming the validity of the proposed controller.     

Dynamic evolution control for synchronous buck DC–DC converter: Theory,model and simulation

This paper proposes a new control technique for synchronous buck DC–DC converter. Theory, design and implementation of the proposed control technique are provided. A new approach for converter controller synthesis based on dynamic evolution control theory is presented. In order to synthesize the converter controller, this method uses a simple analysis of nonlinear equation models of the converter. The synthesis process is simple and requires a quite low bandwidth for the controller. Therefore, this control method is suitable for digital control implementation. As an illustrative example, the synthesis of synchronous buck DC–DC converter controller is discussed in detail. The model of the synchronous buck DC–DC converter system was implemented using SimPowerSystems toolbox of MATLAB-SIMULINK. Performance of the proposed dynamic evolution control under step load change and step input voltage condition was investigated. Simulation results confirm that the proposed control method is superior to traditional PI based controller because of fast transient response and good disturbance rejection.     

Observer‐based control of a photovoltaic DC–DC buck converter: HDS approach

In this paper, a new observer‐based controller is proposed for a photovoltaic DC – DC buck converter; both photovoltaic (PV) voltage and current regulation are considered. In order to deal with the complex and nonlinear PV mathematical model and adapt it to the control purpose, a hybrid PV current observer model is proposed; three modes are defined and the stability of the observer is discussed using the hybrid dynamical system approach (HDS). The observer‐based controller is designed for both voltage and current regulation of the PV system; the closed loop of the full system stability is demonstrated through Lyapunov analysis. Experimental results are also presented showing the feasibility of the proposed observer‐based controller.     

Robust nonlinear adaptive control of multiphase synchronous buck power converters

The problem of controlling multiphase synchronous buck power converters is considered. The aims are to regulate the output voltage of the converter and to ensure adequate current sharing between its different channels. Using the backstepping technique, an adaptive controller is designed based on a large-signal bilinear model of the whole multi-channel converter. A parameter projection is used to ensure that the obtained adaptive controller is robust to parasitic resistances. The controller is formally shown to meet the objectives of closed-loop asymptotic stability, output reference tracking, and equal load sharing. The attraction region depends on the uncertain parasitic impedance size, with the attraction region being larger for smaller parasitic impedances. In the ideal case of no parasitic impedances, the closed-loop asymptotic stability is global. These theoretical results are confirmed by simulation.     

基于SG的Boost变换器T-S模糊建模与控制

针对Boost变换器的非线性特性,基于分段线性电子电路仿真(PLECS)软件建立了电感电流连续状态下Boost变换器的仿真模型,采用T-S模糊控制方法设计了控制器,提出了一种用SG对Boost变换器控制器实现的新方法,并分析了负载及电源电压变动下的控制性能.仿真结果表明PLECS建模的正确性和T-S模糊控制器优越性,且验证System Generator设计开发的有效性.     

基于ADP3181的交错并联同步BUCK电路的设计

介绍了美国模拟器件公司的专用于电压调节模块(VRM)的开关电源控制芯片ADP3181的主要特点,并设计了基于此芯片的三相交错并联同步整流BUCK电路,阐述了主电路和控制芯片外围电路的设计,给出了实验结果。     

Design of ACO based PID controller for zeta converter using reduced order methodology

DC-DC conversion playing major role in many applications of power electronics and widely used in power circuit. Enormous methodology's of PID based converters are created in recent decades. The zeta converter is basically a DC – DC converter and its control the output voltage from an input voltage step up and step down the output voltage. The main scope of this paper is to design of ACO(Ant colony Optimization)based PID controller for zeta converter using model order technique with minimum of error, the zeta converter is basically fourth order system, design of PID controller for fourth order system is quite complex so model order reduction is used for controller design of zeta Converter, Therefore, the higher order system is reduced to second order using three different reduction techniques, then the ACO based PID controller is designed for reduced order system and is matched with the zeta converter, the results shows that designed controller for zeta converter gives quite good response for both the transfer function and is attached with zeta converter circuit, controller gives good performance indices is made on the basis of ISE, IAE and ITAE with minimum value of errors.