DualBoostPFC电路拓扑的研究

传统的BoostPFC电路的整流桥损耗是通信开关电源的主要损耗之一。无整流桥的拓扑更具有效率优势。由于无桥BoostPFC省略了整流桥模块，效率显著的提高。文中分析了一种高效率的DualBoostPFC的大功率应用，通过实验证明了DualBoostPFC电路效率比传统的BoostPFC提高1个百分点，还介绍了电阻采样控制电路的使用和如何降低EMI干扰。     

一种用于单相Boost型PFC中的数字预测算法

本文提出了用于数字控制PFC中的一种新颖的数字控制算法,称为预测算法。它可以得到较高的PF值,并且随着输入电压或者负载电流的变化有近似最快的动态响应。对于一个确定的系统,预测算法根据系统当前的状态参数,可以估算出输出电压和电感电流在下一个开关周期的变化趋势,并且得到一组完美跟踪输入电压轨迹最优的控制序列。在多种仿真条件下的仿真结果证实了预测算法的有效性。当输入电压从90V到265V,负载电流从20%~100%范围变化时,PF值都大于0.998。启动时间和恢复时间分别约为0.1s和0.02s,且无超调。实验结果也验证了设计的有效性。     

Design and analysis of a novel zero-voltage-transition interleaved boost converter for renewable power applications

High-efficiency stepping up operation is an important feature of the converters used in renewable power applications due to the low voltage level of photo-voltaic arrays and fuel cells. Decreasing the switching losses of the converters is an effective solution for increasing the converter efficiency, especially in high-power applications. This article presents a novel zero-voltage-transition (ZVT) interleaved dc–dc boost converter that can be used in renewable power sources to reduce switching losses. The auxiliary circuit used in the proposed converter is composed of only one auxiliary switch and a minimum number of passive components without an important increase in the cost and complexity. The main advantage of the proposed converter is that it not only provides ZVT in the boost switches but also provides soft switching in the auxiliary switch. Another advantage of the proposed topology is that the semiconductor devices used in the converter do not have any additional voltage or current stresses. Also, it has a simple structure, low cost and ease of control. In this article, a detailed steady-state analysis of the proposed converter is presented. The theoretical analysis is verified via simulation and experimental studies which are in very good agreement.     

基于BOOSt结构下不连续导电模式的PFC电路

采用现代高频功率变换技术的有源功率因数校正（Power Factor Corrector,PFC)技术是解决高频开关变换器谐波污染的有效手段。与传统的PFC电路相比，有源PFC电路的输入电流接近正弦波且与输与电压同相位，能有效抑制电流波形畸变和谐波，因此避免了对同一电网设施的干扰。在PFC电路中，Boost变换器是研究和应用得最多的一种变换器。本文着重分析了Boost电路在不连续导电模式状态下，PFC电路的临界条件，对实际电路结构的设计有很好的指导意义。     

Design of a total-dose radiation hardened monolithic CMOS DC-DC boost converter

This paper presents the design and implementation of a monolithic CMOS DC-DC boost converter that is hardened for total dose radiation.In order to improve its radiation tolerant abilities,circuit-level and device-level RHBD(radiation-hardening by design) techniques were employed.Adaptive slope compensation was used to improve the inherent instability.The H-gate MOS transistors,annular gate MOS transistors and guard rings were applied to reduce the impact of total ionizing dose.A boost converter was fabricated by a standard commercial 0.35μm CMOS process.The hardened design converter can work properly in a wide range of total dose radiation environments,with increasing total dose radiation.The efficiency is not as strongly affected by the total dose radiation and so does the leakage performance.     

Fault diagnosis algorithm based on switching function for boost converters

A fault diagnosis algorithm, which is necessary for constructing a reliable power conversion system, should detect fault occurrences as soon as possible to protect the entire system from fatal damages resulting from system malfunction. In this paper, a fault diagnosis algorithm is proposed to detect open- and short-circuit faults that occur in a boost converter switch. The inductor voltage is abnormally kept at a positive DC value during a short-circuit fault in the switch or at a negative DC value during an open-circuit fault condition until the inductor current becomes zero. By employing these abnormal properties during faulty conditions, the inductor voltage is compared with the switching function to detect each fault type by generating fault alarms when a fault occurs. As a result, from the fault alarm, a decision is made in response to the fault occurrence and the fault type in less than two switching time periods using the proposed algorithm constructed in analogue circuits. In addition, the proposed algorithm has good resistivity to discontinuous current-mode operation. As a result, this algorithm features the advantages of low cost and simplicity because of its simple analogue circuit configuration.     

模块化多电平静止无功补偿器控制策略研究

随着多电平逆变器在电力系统无功功率补偿领域的广泛应用,提出了一种基于模块化多电平( MMC)技术的新型静止无功补偿器( STATCOM)的拓扑结构。该拓扑结构具有模块化程度高、可靠性好、便于维护及容量拓展等特点,是一种极具发展潜力的拓扑结构。首先对MMC-STATCOM的工作原理和数学模型进行了分析,提出了无功功率解耦控制策略以及提出了一种新的控制子模块电容电压平衡的控制算法。仿真和测试结果均表明MMC-STATCOM具有补偿效果好,动态响应速度快等优点,是一种具有工程应用价值的大容量STATCOM主电路拓扑。     

基于复合型单开关PFC预调节器的设计

为了解决计算机系统电源保持时间问题,确保输出电压在一段时间稳定在一定范围内。确保计算机在出现输入故障是有足够的时间备份数据或者切换到不间断电源(UPS)下工作。为此提出了一种复合型单开关PFC预调器、并根据需求进行了设计,该设计可以减小储能电容的容量,使输出电流谐波满足IEC1000-302的要求。     

基于耦合电感高增益Buck-Boost变换器小信号建模

基于耦合电感的高增益变换器在新能源发电和直流微电网中均有良好的应用前景。论文在分析基于耦合电感的高增益升降压(Buck-Boost)变换器工作原理的基础上,采用开关流图法建立变换器的模型,详细推导了变换器的稳态模型和交流小信号模型;电力仿真(PSIM)软件对变换器小信号模型的仿真结果证明论文模型的正确性。论文结果对高增益DC/DC变换器控制回路的设计具有较高的参考价值。     

High efficiency boost converter with variable output voltage using a self-reference comparator

This paper presents a boost converter with variable output voltage and a new maximum power point tracking (MPPT) scheme for biomedical applications. The variable output voltage feature facilitates its usage in a wide range of applications. This is achieved by means of a new low-power self-reference comparator. A new modified MPPT scheme is proposed which improves the efficiency by 10%. Also, to further increase the efficiency, a level converter circuit is used to lower the V_dd of the digital section. The low input voltage requirements allow operation from a thermoelectric generator powered by body heat. Using this approach, a thermoelectric energy harvesting circuit has been designed in a 180 nm CMOS technology. According to HSPICE Simulation results, the circuit operates from input voltages as low as 40 mV and generates output voltages ranging from 1 to 3 V. A maximum power of 138 μW can be obtained from the output of the boost converter which means that the maximum end-to-end efficiency is 52%.     

基于平均电流的双闭环APFC电路的设计

为有效消除电力电子设备的谐波干扰,基于UC3855设计了BOOST功率因数校正电路。主电路为减少功率损耗采用ZVT零电压辅助开关。控制电路采用双闭环平均电流模式。利用乘法器校正使输入电流接近正弦波并保持与电压同相位。通过小信号建模推导了电流环、电压环传递函数,配置了系统双环补偿校正网络的参数。最后通过MATLAB仿真和实验验证了设计的正确性。系统的动、稳态性能良好,功率因数接近为1。     

SOA-XGM全光波长变换器的特性分析

对基于半导体光放大器交叉增益调制实现的全光波长变换器的工作特性进行了分析，归纳了要取得较好的变换效果，应在输入信号光功率、波长、偏置电流、放大器腔体长度等方面作合理的选择，使输出信号的消光比、信噪比等指标符合要求。     

Design and analysis of a proposed transformerless/non-isolated high-‎gain DC-DC converter for renewable energy applications

ABSTRACT

This paper proposes a transformerless/non-isolated, high-gain DC-DC converter required to increase low voltages in renewable energy applications. The converter topology uses only a single-switch with minimum voltage stress over the semiconductors. The design is obtained by integrating both the boost and the quadratic boost converter topology. Operating principles of the converter circuit topology are detailed, and the steady-state performance is analysed. The design results in lower switching voltage that significantly improves the efficiency of the controlled switches. The results obtained by computer simulation demonstrate that the high voltage gain is obtained at lower values of duty ratio with an efficiency of more than 94%. The merits of the proposed converter are given in comparison with other high-gain DC-DC converters. Finally, a laboratory model is built using the digital signal processor [dSPACE (DS-1104)] to verify the converter theory. The theoretical, simulation and experimental results that indicate the claimed converter performance and capability are given.     

基于超表面的低剖面高增益圆极化天线

提出了一种基于缝隙耦合超材料表面的低剖面圆极化高增益天线,该天线由一个超材料表面和一个微带缝隙天线紧贴着组成.通过改变超表面切角的大小来产生圆极化波,同时还可以提高天线增益和拓宽阻抗带宽.为了验证仿真结果,制作和测量了一个大小为1λ×1λ×0.067λ(在10 GHz处)的样本天线,仿真和测量结果显示出良好的一致性.结...     

基于高性能升压转换器的跨导误差放大器

在分析峰值电流模式升压转换器原理的基础上,设计了一种结构新颖,高精度高性能跨导误差放大器。提出了将具有动态电流自补偿功能的基准电压电路复用为误差放大器输入级的新方法,克服了传统外接基准电压时误差放大器易受干扰和基准电路设计复杂的缺点,提高了误差信号精度和放大器跨导。设计了输出电阻可调电路,简化了补偿网络设计。电路用0.6μmBiCMOS工艺实现,测试表明:3V输入电压,1.2MHz工作频率下,误差放大器开环电压增益57dB,跨导322μS,输入偏置电流小于50nA;升压转换器输出电压15V,输出纹波小于5mV。     

Switch failure diagnosis based on inductor current observation for boost converters

Face to the growing number of applications using DC–DC power converters, the improvement of their reliability is subject to an increasing number of studies. Especially in safety critical applications, designing fault-tolerant converters is becoming mandatory. In this paper, a switch fault-tolerant DC–DC converter is studied. First, some of the fastest Fault Detection Algorithms (FDAs) are recalled. Then, a fast switch FDA is proposed which can detect both types of failures; open circuit fault as well as short circuit fault can be detected in less than one switching period. Second, a fault-tolerant converter which can be reconfigured under those types of fault is introduced. Hardware-In-the-Loop (HIL) results and experimental validations are given to verify the validity of the proposed switch fault-tolerant approach in the case of a single switch DC–DC boost converter with one redundant switch.     

A new controller for boost dc–dc converters based on a novel sliding surface

ABSTRACT

In this paper, two control schemes for boost converters affected by uncertainties in input voltage and load are proposed. The boost converter dynamics is redefined in terms of new state variables to facilitate the use of a disturbance observer that can estimate matched and unmatched disturbances. A sliding surface, which is new in the context of boost converters, is proposed to enable tracking and regulation of output voltage without requiring measurement of input voltage and load current. The stability of the overall system including the disturbance observer, the sliding variable and the output is proved. The performance of the schemes is assessed for regulation of output voltage and tracking of reference voltage by simulation as well as experimentation in which various types of uncertainties and various types of reference voltages are considered.     

一种单相三电平高功率因数PWM整流器的研究与仿真

介绍了一种新型单相三电平高功率因数PWM整流器电路拓扑,详细分析了该电路的工作状态,推导了其数学模型。采用预测电流控制和逻辑开关状态控制作为其控制策略,经计算机仿真结果表明,该整流器能够维持直流侧输出电压稳定,并可实现高功率因数运行。     

基于40 nm CMOS工艺的高效率功率放大器设计

针对硅基毫米波功率放大器存在的饱和输出功率较低、增益不足和效率不高的问题,基于TSMC 40nm CMOS工艺,设计了一款工作在28GHz的高效率和高增益连续F类功率放大器。提出的功率放大器由驱动级和功率级组成。针对功率级设计了一款基于变压器的谐波控制网络来实现功率合成和谐波控制,有效地提高了功率放大器的饱和输出功率和功率附加效率。采用PMOS管电容抵消功率级的栅源电容,进一步提高线性度和增益。电路后仿真结果表明,设计的功率放大器在饱和输出功率为20.5dBm处的峰值功率附加效率54%,1dB压缩点为19dBm,功率增益为27dB,在24GHz~32GHz频率处的功率附加效率大于40%。     

对一款新型高精度电子计重仪的研究

新型高精度电子计重仪是一款全新的高精度的全自动计重仪器,它主要由称重传感器,16位单片机控制模块,AD转换模块,数码管显示模块,交流稳压电源五部分组成。针对目前广大的市场,我们有针对性地开发出这套有实用价值的电子秤系统。从技术上克服诸多缺点,改善电子秤系统在应用中的不足之处,具有现实意义。