Three-Phase Rectifier With Active Current Injection and High Efficiency

An active current injection network for a three-phase rectifier is proposed. The proposed circuit uses three bidirectional switches operating at low frequency and a half-bridge inverter operating at high frequency. It also uses an inductor in order to make the current modulation. Because only 3.7% of the total power delivered to the load is processed by the injection network, the proposed converter offers high efficiency, and not only a high power factor is obtained but also the total harmonic distortion is reduced. Operation, analysis, simulation, and experimental results are shown in this paper.     

三相整流桥PFC电路拓扑的分析及控制

通过对三相二假管整流挢构成的功率因数校正（PFC）拓扑电路较详尽的分析,表明在无逆变功能的要求下,只需单只全控型开关元件,经脉宽州制PWM控制。在断续导通控制模式下,便可达到功率阁数接近1和交流正弦的进线电流的目的。文巾利用了单周控制和Matlab／Simulink软件,对三相二极管整流的Boost PFC电路进行了建模和仿真,得出了预期的结果．证明在原理上是可行的。此PFC电路只用一只全控型开关元件,从而可能降低设备的成本。     

Voltage Injection Method for Three-Phase Current Reconstruction in PWM Inverters Using a Single Sensor

This paper presents a voltage injection method for reconstructing phase currents from current signals measured on single current-shunt circuits with cost-effective and high-performance configurations in the pulsewidth modulation (PWM) inverters that are used for digital appliances. This method involves the injection of voltage signals at the carrier frequency for reconstructing the phase currents in PWM inverters using a single current sensor in the DC-link. It uses minimum signals to reduce the voltage and current harmonics caused by the injected signals. The vector of the injected voltage is at a minimum distance from the original reference to ensure the measurement time in the reconstruction of the phase currents. An injection sequence control method is also proposed to avoid an abrupt change in the injection signals. A PWM scheme for splitting phase voltages is proposed to reduce any audible noise, especially in low-speed operation. The proposed method reconstructs the phase currents with signals from a single current sensor and minimizes the amplitude of the injected signals to reduce the harmonics at audible noise frequencies in the injection signals. Experimental results showed the effectiveness of the proposed method.     

谐波注入式12脉波整流器

文中介绍了一种新式的谐波注入式12脉波整流器的基本工作原理和谐波注入法。     

一种新型双二极管5.8 GHz谐波抑制的整流电路

设计了一个5.8 GHz谐波抑制的新型整流电路。电路采用一对双二极管结合微带滤波设计,利用结构对称性实现偶次谐波抑制,结合扇形枝节三次谐波抑制,实现整流电路的四阶谐波抑制功能并具有宽带特性。实测和仿真结果基本一致,在5.8 GHz输入功率18 dBm时整流效率达到77.9%,并在5.725 GHz～5.875 GHz的ISM频段内的整流效率均超过74%。     

A Novel Variable Hysteresis Band Current Control of Three-Phase Three-Level Unity PF Rectifier With Constant Switching Frequency

A Simple and novel variable hysteresis band current control technique for three-phase three-level unity power factor (PF) rectifier is proposed in this paper. The hysteresis band is controlled as variations of the rectifier input voltage and output dc link voltage to achieve constant switching frequency at any operating conditions, i.e., at rated and below and above the rated conditions. The rectifier has the characteristic of easy implementation, and draws a nearly sinusoidal current at unity input PF. Theoretical and predicted results of its analysis are verified initially through digital simulation, and confirmed by using an experimental prototype     

三相PWM整流器双闭环PI调节器的新型设计

通过分析三相脉宽调制（PWM）整流器在d-q旋转坐标系下的数学模型,设计了具有前馈解耦控制的PWM整流器双闭环控制系统。根据系统对电流内环的控制要求设计电流比例积分（PI）调节器,提出按闭环幅频特性峰值（Mr）最小准则来确定调节器参数的方法;根据系统对电压外环的控制要求,采用模最佳整定法来设计电压PI调节器。最后对整个PWM整流器双闭环控制系统进行仿真,仿真结果验证了PI调节器设计的正确性。     

并联型三相有源滤波器谐波电流检测研究

在有源滤波器设计中,谐波电流的实时检测与分离是其中的关键环节。文中分析了基于瞬时无功理论的ip、iq法检测谐波电流的基本原理与实现方法。ipi、q法与DFT谐波电流检测方法相比,实时性能更好,容易实现,而且不受电网电压波形畸变的影响。仿真和实验表明,采用ipi、q法能够实时、准确地检测出非线性负载的谐波电流和无功电流。     

A General-Purpose Microprocessor-Based Control Circuit for a Three-Phase Controlled Rectifier Bridge

A novel general-purpose microprocessor-based control circuit for a three-phase controlled rectifier is presented. The performance exhibited by the controller is superior to previously presented circuits. The firing angle is smoothly controlled in the range of 0 to 180/s=deg/ with a fast response and a constant open loop gain, even for the cases where the converter is fed by a weak ac system of unregulated frequency. The synchronization between the line and VCO is implemented by an efficient software-controlled PLL. The effect of source impedance in delaying the synchronization signal has been properly compensated for by the-control circuit. The implementation of the compensation circuit is also presented. The hardware and software control circuit implementation built around an 8086 microprocessor is discussed, and the experimental results are given.     

A Bridgeless PFC Boost Rectifier With Optimized Magnetic Utilization

The implementation of a bridgeless power factor correction (PFC) boost rectifier with low common-mode noise is presented in this paper. The proposed implementation employs a unique multiple-winding, multicore inductor to increase the utilization of the magnetic material. The operation and performance of the circuit were verified on a 750-W, universal-line experimental prototype operating at 110 kHz.      

采用PFC电路抑制彩色显示器谐波电流

彩色显示器的功率因数低、谐波电流发射大，严重污染了公用电网。解决彩色显示器谐波电流使之符合有关标准成为各方面关注的问题。本文从电路工作原理出发详细介绍了一种解决谐波电流发射的方法-功率因数校正技术。实验结果表明，该方法行之有效。     

一种新颖的PFC控制策略

分析设计了一款新颖的功率因数校正(PFC)电路,该电路可以工作于不连续传导模式(DCM)和临界连续传导模式(CRM),并实现两种模式的自动切换,兼具两种工作模式的优势。在输入电压跨零附近,电路工作于固定频率的DCM下,限制最大的开关频率,从而降低污染系统的电磁干扰(EMI)噪声。在输入电压峰值附近,电路工作于频率可变的CRM下,降低升压二极管、功率MOSFET和电感上的电流应力,从而降低费用并且提高电路的可靠性。采用台联电0.6μmBCD工艺仿真验证,得到了近1的功率因数。     

直接电流控制的三相桥式PWM整流电路的设计与分析

文章对直接电流控制的PWM整流电路开展研究,主要内容如下：（1）设计BOOST型三相桥式PWM整流器的主电路。（2）设计基于直接电流控制的PWM整流电路的控制系统。（3）建立直接电流控制系统Simulink仿真模型,进行仿真分析。仿真结果证明直接电流控制方案使得PWM整流器功率因数接近于1,流入电网的电流基本接近正弦波,对电网的谐波污染小。     

A Novel Three-Phase Three-Leg AC/AC Converter Using Nine IGBTs

This paper proposes a novel three-phase nine-switch ac/ac converter topology. This converter features sinusoidal inputs and outputs, unity input power factor, and more importantly, low manufacturing cost due to its reduced number of active switches. The operating principle of the converter is elaborated; its modulation schemes are discussed. Simulated semiconductor loss analysis and comparison with the back-to-back two-level voltage source converter are presented. Finally, experimental results from a 5-kVA prototype system are provided to verify the validity of the proposed topology.     

Comprehensive Design of a Three-Phase Three-Switch Buck-Type PWM Rectifier

A three-phase three-switch buck-type pulsewidth modulation rectifier is designed for telecom applications in this paper. The rectifier features a constant 400-V output voltage and 5-kW output power at the three-phase 400-V mains. The principle of operation and the calculation of the relative on-times of the power transistors are described. Based on analytical relationships the stresses of the active and passive components are determined and the accuracy of the given calculations is verified by digital simulations. Exemplarily, a 5-kW power converter is then designed based on the analytical expressions and on switching loss measurements from a hardware prototype constructed with insulated gate bipolar transistor/diode power modules. The loss distribution of the components, the total efficiency, and the junction temperatures of the semiconductors are then evaluated in dependency on the operating point. Finally, the trade-off between the selected switching frequency and the admissible power range for the realized design is shown and a total efficiency of 95.0% is measured on the hardware prototype, where an excellent agreement with the theoretically evaluated efficiency is shown     

Analysis of Slow-Scale Instability in Boost PFC Converter Using the Method of Harmonic Balance and Floquet Theory

In this paper, the slow-scale instability in a boost PFC converter under average current mode control is studied via the harmonic balance method and Floquet theory. Systematic and general numerical algorithm of the technique is developed. The objective is to identify instability of the system. If instability exists, the type of bifurcation and the boundaries of slow-scale instability in the parameter space of the system can be found for facilitating the design of such converters. Firstly, based on the fact that the current compensator is designed very well and what we considered is the slow-scale instability, the simplified model of a boost PFC converter under average current mode control is derived. And then, the solution of the simplified model is calculated by using the harmonic balance method. Subsequently, both the stability of the circuit system and the type of bifurcation are identified via Floquet theory. Meanwhile, the critical conditions of the stable operation in the parameter space of the system are given accurately. Finally, experimental results are presented for the verification of the analytical results.      

基于不可控整流的单相PFC研究

电力电子设备在各工业领域的广泛应用造成了日益严重的谐波污染问题,有源功率因数校正技术成为解决这一问题的有效方法。文章在分析传统Boost电路导致功率因数降低的原因和Boost APFC原理的基础上,针对目前功率因数校正效果偏低的问题,提出了双闭环融合电流前馈技术的控制策略,搭建了单相Boost APFC实验平台加以验证。实验结果表明,本控制方式具有功率因数高、输出电压稳定、动态响应效果好等优点。     

一种改善PFC变换器输入电流过零畸变的方法

功率因数校正（PFC）变换器普遍存在输入电流在输入电压过零点附近发生畸变的现象。文中详细分析了PFC变换器输入电流在输入电压过零点附近产生畸变的原因,指出了Boost PFC变换器的输入电流超前于输入电压是导致位移因数不为1和输入电流过零畸变的主要原因;提出了根据输入电流在输入电压过零时刻的值实时修正参考输入电压的初相角,以改善PFC变换器输入电流过零畸变的数字控制方法。仿真结果证明了文中所提出的方法的有效性,特别是在400Hz输入电压下有很好的效果。     

一种新型超势垒整流器

提出了一种新型的超势垒整流器(SBR).对SBR结构势垒进行了理论分析,建立了该器件正向压降的解析式,并设计了该器件的工艺流程.仿真结果表明:SBR的正向压降和功耗比常规PN结二极管小,反向恢复特性优于常规PN结二极管;SBR比肖特基二极管的可靠性高.该分析可以很好地指导这类整流器件的设计.     

一种新颖自举型微功耗整流器

论述了用于UHF频段(900 MHz)射频电子标签微功耗整流器的设计。在传统的Dickson肖特基型倍压整流器结构基础上,采用了改进的自举型电路结构,在普通RF CMOS工艺中实现了整流器的微功耗、高整流效率特性,消除了工艺特殊器件的限制。采用0.18μm RF CMOS工艺技术,整流器的工作频率范围为840~960MHz,实测整流效率近30%。