300VZVZCS直流稳压电源设计

为克服零电压开关(ZVS)变换器自身存在的初级环流较大,以及滞后臂开关实现ZVS受负载电流限制等缺点,利用零电压零电流(ZVZCS)全桥变换器设计了一种用于某新型金属表面处理工艺的300V直流稳压电源。它能在很宽的负载范围内实现ZVZCS。为满足工艺对该电源的要求,在电源中采用了峰值电流型控制模式,提高了电源的快速动态响应性能。实验结果验证了该电源设计方案的可行性。     

A novel soft-switching PWM dc-dc converter with high-frequency transformer link and its open-loop regulation characteristics

In the practical requirement for high efficiency, high power density, and high performance in switched-mode power supplies and their related application systems, a variety of circuit topologies of dc-dc converters incorporating soft-switching PDM, PFM, and PWM control schemes have attracted special interest in low-power and high-power applications. Some types of quasi-resonant soft-switching PWM converters have remarkable advantages, such as lowered switching losses of power semiconductor devices, reduced dynamic electrical stresses, constant-frequency operation, simple control schemes, and reduced EMI noise. However, most soft-switched quasi-resonant PWM converters developed so far include some inherent problems which must be solved, such as reduced power conversion efficiency due to significant circulating current generation. In recent years, a newly modified prototype soft-switched PWM dc-dc converter with a high-frequency transformer link has been proposed, which is capable of excluding circulating current operation mode. This paper presents a novel high-frequency transformer link soft-switching PWM dc-dc converter using active switches in the rectifier circuit. Its operating principles and unique features are described and compared with previously developed dc-dc converters. The operating performance of this converter in the steady state is illustrated and discussed, including simulated analytical and experimental results. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 119(3): 81–93, 1997     

对称PWM控制ZVS半桥变换器研究

与传统半桥电路相比,采用对称PWM控制方法的半桥软开关直流变换器电路增加了一个由辅助开关管和一个二极管组成的支路.其主开关管不仅工作在对称状态,而且能很好实现软开关,辅助开关管在主开关管关闭期间实现ZVS和ZCS导通.在分析该变换器的工作原理基础之上,研究了其工作特性,重点分析了谐振电感在实现ZVS和引起占空比丢失方面的影响,仿真和实验研究表明该变换器具有优良的性能.     

二次侧加钳位开关管的ZCS PWM Boost型DC/DC全桥变换器

提出了一种二次侧加钳位开关管的移相控制零电流开关(ZCS) PWM Boost 型DC/DC全桥变换器.该变换器在二次侧加二只用作钳位的辅助开关管,利用恒定的输出电压,通过变压器对一次侧的开关管进行钳位,减小了开关管的电压应力,所有开关管均实现ZCS.本文对该变换器的工作原理进行了详细分析,给出了参数设计的原则.在实验室完成了一台1200W原理样机,实验结果证实了理论分析的正确性.     

单周期控制技术在激光电源中的应用

单周期控制是一种用于功率变换器的新型非线性控制策略,当输入电压发生扰动或负载快速变化情况时仅在一个周期内就可实现控制目标。将单周期控制技术控制技术应用于ZCS准谐振DC/DC变换器构成的激光电源,并通过软开关技术减小了开关损耗,减轻了电路体积。通过电路建模的方式,使用Pspice软件对电路进行了仿真。并对电源电路进行了实验研究,完成了硬件电路设计和主要电路参数的确定。实验结果证明了原理分析和设计方法的正确性。     

全桥ZCS-Boost倍压变换器软开关条件和增益特性研究

为了探讨ZCS-Boost倍压变换器应用于行波管电源的可行性,文章分析了全桥ZCS-Boost倍压变换器的零电流实现条件和增益特性。这一变换器结构简单,具有高增益的特点,适合应用于高压高功率的场合。四个开关管都能实现零电流开关。为了推导的顺利进行,本文简要叙述了这一变换器的工作原理,推导出了实现零电流开关的约束条件;由于工作过程复杂,且工作模式较多,所以这一变换器的增益特性还没有被系统地研究过。本文通过引入变量,初步推导了这一变换器的电压增益公式;最后,对这两个结果,运用PSPICE仿真来验证这一变换器在某新型行波管电源28V直流输入的条件下的可行性,结论显示仿真结果和推导公式相互吻合。     

改进型零电流PWM Boost变换器

提出了一种基于零电流脉宽调制开关单元的改进型ZCSPWM Boost变换器。详细分析了改进型ZCSPWM Boost变换器的工作原理和软开关实现条件,并进行了仿真。仿真结果验证了改进型ZCSPWM Boost变换器的可行性和正确性。     

伪直流链逆变技术在光伏逆变器中的应用

提出一种新型光伏逆变器,采用伪直流链逆变技术,将传统逆变技术与软开关技术相结合,使逆变器前级直接输出工频全波整流电压,后级只需进行电压极性翻转。加上倍压整流电路的引入,使其与传统光伏逆变器相比,具有升压比大、效率高、体积小、滤波效果好等优点。对该逆变器运行机理和工作模态进行了分析,通过实验证明了该方案的可行性,给出了实验相关波形和不同负载下的工作效率。     

一种新颖的零电压开关谐振直流环节逆变器的电路分析

作者曾提出过一种新颖的零电压开关谐振直流环节逆变器 ,就该逆变器的动作模式及主电路的电压、电流的瞬态过程进行了分析 ,并给出了仿真研究结果     

Optimized design of a fully soft-switched boost-converter suitable for power factor correction

A fully soft-switched boost-converter using a one auxiliary switch is presented here. It uses the minimum number of components in the auxiliary circuit with minimum current stress of the main switch. Since the resonant capacitor charges only through an inductor and a diode, the circuit conduction losses are minimized. The main and auxiliary insulated gate bipolar transistor (IGBT) switches share a common emitter connection, facilitating direct drive to them. Various operating modes of the converter are presented in detail and analysed. The choice of the resonating capacitor and inductor has been done through an optimization process based on the guiding equations working under different modes. In this optimization process, emphasis has been given on minimum voltage stress on the auxiliary switch for a wide duty cycle range of operation. Based on the design, the principle of operation has been verified with computer simulation. Experimental results from a laboratory prototype with active power factor correction confirms the operation of this converter.