Power electronic converter and system control

This paper deals with modern control systems technology that is frequently applied to power conversion systems. The discussion goes far beyond the basic level of switch control in switching regulators. System-level control issues are important in expanding the market base of power electronics. Improvement in system performance involves not only the use of advanced control techniques, but also the integration of several converters or converter systems into a larger system. A fully controlled rectifier and an induction motor drive system are presented as typical applications to illustrate the use of many techniques for controlling power converters. The paper then points out how a wide variety of control techniques can be applied to enhance the controller performance and bandwidth in power electronics. These techniques include observers and adaptive control, nonlinear control, sliding and dead-beat control, and intelligent control. Finally, the paper points out how power electronic system performance can be enhanced through the use of condition monitoring and diagnostics     

Power electronic converter EMC analysis through state variableapproach techniques

A technique based on the state vector approach and a simple switch device model is proposed for electromagnetic compatibility (EMC) analysis in converter design. The conducted noise spectrum is straightforward computed in the frequency domain for hard switching converters with alternating or direct current input sources. The results are compared with PSpice time-domain simulations mixed with the fast Fourier transform, considering a buck converter. The technique proposed in this paper is appropriate for applications where calculation speed is preferred rather than high precision     

User-friendly dedicated power electronic converter simulator

A user-friendly power electronic simulator for the design and analysis of power electronic circuits is presented. A graphic input interface module called ATOSECG has been developed for the dedicated power electronic converter system simulator ATOSEC5. ATOSECG has tremendously facilitated the interaction of the user with the simulator. Examples of application of the ATOSEC5 simulator for the analysis of a complex multiconverter system are given     

Self-compensating silicon load cell with an electronic converter

A diffused strain-gauge transducer has been developed for application in either a load cell or differential pressure configuration. The diffused strain elements eliminate the need for bonding material and insure transmission of the applied load to the sensing elements, One unique feature of the transducer is its ability to provide an electrical signal which is proportional to temperature as well as pressure. Other advantages include large output signals, high impedance, small hysteresis, and small temperature dependence. Also described is an electronic converter which provides a nominal 4-20 mA output signal over the operating temperature range.     

Flux-based two-degrees-of-freedom algorithm for three-phase electronic converter control

This letter integrates the tracking robustness of two-degrees-of-freedom control and fast dynamic response of flux-based, pulse-width modulation to develop a new current controller for high performance, three-phase electronic converter control. Theoretical analysis shows that the controller can simultaneously achieve good steady-state, transient and harmonic performance, which are challenges not previously met by existing current controllers reported in the literature. Experimental results are presented to verify the performance and practicality of the proposed controller.     

Passive polarization converter in SiON technology

A passive polarization converter has been realized in silicon oxynitride (SiON) technology. The device is a grating assisted codirectional coupler consisting of segments of asymmetrically etched ridge waveguides. By using a double-masking technique, the fabrication of the device is tolerant with respect to the alignment of the required masks. Conversion efficiencies up to 0.98 (TE→TM and TM→TE) and insertion losses of 3 dB/cm have been measured. Using 2-D beam propagation method simulations, an observed beat pattern in the converter could be explained as due to a leaky mode, which is captured in the grating structure     

LCD TV中的电源转换链与开关电源拓扑

电视机的升级 自从英国广播公司(BBC)于1936年在伦敦开通世界上首个公共电视广播以来,电视机技术已取得了长足的发展:从BBC于1953年首先开通彩色电视广播,到日本NHK于1981年进行首例高清电视(HDTV)系统演示等,不一而足.     

电力电子技术在节能与战略性新兴产业中的应用

发展战略性新兴产业是我国新时期经济社会发展的重大战略任务。文章介绍了战略性新兴产业所包含的内容、新兴产业中所涉及的关键设备和核心技术以及在新兴产业中相关领域的应用。     

A high-power-factor electronic ballast using a flyback push-pullintegrated converter

This paper describes a high-power-factor electronic ballast for fluorescent lamps. The converter offers a high power factor and a high-frequency supply to the lamp using a single switch. In spite of its simplicity, an excellent performance concerning load and supply is achieved, ensuring a sinusoidal and in-phase supply current. High power factor is achieved by using a flyback converter operating in discontinuous conduction mode. Operating principle, design equations, component stress, and efficiency are presented. Experimental results have been obtained for one 40-W fluorescent lamp operating at 50-kHz switching frequency and 220-V line voltage     

Power electronic circuit topology

A generalized concept of `sources' that embraces both power generators and power consumers is presented. This approach simplifies the basic topological aspects of power electronic converter circuits, which are reduced to an array of switches for selectively interconnecting two source systems. Capacitive and inductive filters can modify the nature of the systems, because they act as short-time sources and determine whether the converter sees a voltage source or a current source at its terminals. These differing source qualities require different types of switching devices and have ramifications in the mode of operation of the equipment. Some basic configurations are presented, and their significant properties are described, with emphasis on the most widely used circuits in high-power equipment, particularly AC/DC converters     

DPL-based novel Binary-to-ternary converter on CMOS technology

Encoding radix-2 data in radix-3 has the potential to allow faster computation with reduced power dissipation, reduced chip area and reduced interconnect overhead. Use of ternary encoding has the potential to minimize hot-spot generation and bring down fabrication costs due to reduced complexity. Efficient binary-to-ternary conversion is needed to attain these benefits in today's binary-dominated digital world. This paper presents a novel strategy to convert from a 2-valued binary input to a 3-valued ternary output. The proposed converter operates in 4 steps: (I) Synchronous complementary input generation, (II) Binary to unary conversion, (III) Unary to ternary interfacing, and (IV) Ternary output generation. A design using double pass-transistor logic delay equalized through coarse and fine-tuning is presented. Ternary values are encoded using 0, 0.9 and 1.8 V to represent ternary digit (trit) values of 0, 1 and 2. The proposed converter design has been validated using T-Spice transient-response simulation on TSMC 0.18 µm SPDM CMOS technology at 25 °C on Tanner EDA V.13. The worst-case response of the proposed design was identified using corner analysis with typical, slow and fast PVT variation.     

Power budgeting of a multiple-input buck-boost converter

The use of a multiple-input buck-boost converter for budgeting power between different energy sources is discussed. It is shown mathematically that the idealized converter can accommodate arbitrary power commands for each input source while maintaining a prescribed output voltage. Power budgeting is demonstrated experimentally for a real converter under various circumstances, including a two-input (solar and line-powered) system. A closed-loop control example involving simultaneous tracking of output voltage and set-point tracking of the solar array shows that an autonomous system is realizable.     

Power factor correction converter using delay control

A low cost universal input voltage single-controller power factor correction converter for a 200 W power supply is proposed. It consists of the PFC part followed by a DC-DC converter as in a conventional two-stage scheme. However a single PWM controller is used as in a single-stage PFC scheme. The switch in the PFC part is synchronized with the switch in the DC-DC converter and has a fixed frequency. Employing an adaptive delay scheme, the PPC switch is controlled to limit the capacitor voltage within a desired range for optimum efficiency and to reduce input current harmonic distortion. The design procedures of the delay scheme, the feedback loop, and experimented results are presented to verify the performance     

Microprocessors and integrated electronic technology

The microprocessor has made it possible for a standard complex function to be employed in a broad range of applications that extends the applicability of large-scale integration (LSI) to many situations that could not support special chip designs. This in turn has freed the technology from previous restrictions to evolve in directions appropriate for microprocessors and associated LSI functions. The result is that many new variations of cirucit design and process technology have arisen that lead toward more dense and higher performance integrated-circuit structures.     

《变频器应用技术》课程教学改革

课程建设是学校办学水平的重要标志,高职院校如何改革课程建设,形成自己的办学特色,是各高职院校提升内涵的重点所在。变频器控制技术推行校企合作的工学交替课程教学模式;实施“教、学、做”一体化教学;课程学习与职业资格认证相结合;课程内容与岗位需要相一致。改革后,大大提高了学生的技能水平和学习积极性。     

Power converter for single phase switched reluctance motors

A novel power electronic converter for a single phase switched reluctance drive is presented. This converter allows `turn on and turn off voltage boosting', with one less semiconductor device than previous DC link voltage boosting topologies. The boost voltage can also be more precisely controlled     

LLC谐振变换器的数字均流技术研究

采用LLC谐振变换拓扑,结合分析当前的并联均流方式,提出一种数字式LLC谐振变换器均流技术.基于CAN总线通讯可实现模块间实时通信,从而实现并联系统的数字化均流.在MATLAB/Simulink下建立了全桥LLC并联系统的闭环仿真模型,实现了零电压开关,通过三环控制和PI算法相结合,对比加入此均流策略前后的输出电流波形...     

变频器故障诊断技术研究

随着社会的不断发展和完善,变频器的应用越来越广泛。传统的设备调速方法效率比较低,并且损耗相对比较大,应用变频器可以有效解决这些问题。但是在对变频器实际应用的过程当中,经常有故障出现,从而对变频器的使用效率产生比较严重的影响,所以需要解决这些问题。文章对此展开分析。     

基于双PWM变换器的能馈型交流电子负载研究

为了替代传统负载和能耗型电子负载,研究一种基于双PWM变换器的能量回馈型交流电子负载。主电路采用双PWM变换器构成背靠背系统的拓扑结构,负载模拟变换器采用滞环的电流单闭环控制策略,并网变换器采用直流电压外环和电网侧交流电流内环的双环闭控制策略。通过Matlab/Simulink仿真试验,证明了该方案可以实现对负载模拟侧电流精确控制,模拟所需负载特性的功能,同时将测试电能回馈电网,并网逆变侧功率因数接近于1。仿真结果表明该方案可行且有效。