一种新颖的ZVT Boost变换器

脉宽调制（Pulse Width Modulation,简称PWM）Boost变换器被广泛用作DC/DC变换器和功率因数校正装置。提出了一种新颖的零电压转换（Zero Voltage Transition,简称ZVT）Boost变换器,利用能量反馈辅助电路实现了升压管的ZVT和升压二极管的软开关。辅助电路由辅助开关管、耦合电感（反激变压器）和反馈二极管构成。辅助开关管实现了零电流开通和近似零电压关断,变换器的效率较高,电磁干扰低。在辅助开关管关断时,耦合电感将谐振电路中的能量馈送至电源端,功率器件的电压电流应力较低,辅助电路的传导损耗较小。详细分析了该变换器的工作原理,并通过样机进行了验证。     

Quasi-resonant inverter-fed direct torque controlled induction motor drive

A quasi-resonant inverter-fed induction motor operated under direct torque control (DTC) scheme is modeled and analyzed with SABER simulator. The dc link voltage is clamped to source voltage. All the devices in the resonant link and inverter except auxiliary switch in the resonant link are operated soft under zero-voltage switching (ZVS). The auxiliary switch is turned on under zero-current switching (ZCS), but turned off hard. This scheme has been implemented on a laboratory-sized experimental setup. A comparison of simulation and experimental results under identical operating conditions were presented.     

同步整流反激逆变器研究

研究了由两路双向反激直流变换器输入并联输出串联构成的反激逆变器。在连续工作模式的反激逆变器的基础上，提出同步整流控制方案，即输出功率较大时实现同步整流，较小时实现零电压开通，大大简化了传统电流源高频链逆变器的控制方案，从而有效地降低了整流二极管导通损耗，将整机效率提高到85.8%。研究内容包括工作模式、控制策略、关键参数设计准则、同步整流或零电压开通的实现和边界问题。原理试验样机验证了该逆变器及其控制策略的正确性和先进性，证实其适合于低压大电流变换场合。     

新型无刷直流电动机专用谐振极逆变器研究

无刷直流电动机通常采用硬开关逆变器驱动.硬开关逆变器的系统效率较低,散热器的体积和重量较大,限制了无刷直流电动机驱动系统功率密度和性能的进一步提升.针对硬开关逆变器问题,提出了一种无刷直流电动机驱动系统专用的谐振极软开关电压源逆变器.通过在传统硬开关逆变器三个输出端和直流母线之间添加辅助谐振单元,实现了逆变桥主开关器件的PWM软开关动作.谐振控制开关零电流开关条件开通,零电压开关条件关断.对提出的新型谐振极逆变器进行了数学分析和仿真研究;仿真结果验证了电路结构和理论分析的正确性与可行性.     

零电流开关PWM反激变换器

针对反激变换器的变压器漏感中的储能损失以及开关管存在较大的开关损耗和电压尖峰等问题,提出基于新型ZCS-PWM辅助电路的反激变换器.详细分析了工作原理和稳态特性,给出参数设计的原则,并通过一台150 W、50 kHz的原理样机实验验证了该零电流开关技术的可行性.实验结果表明,该变换器在整个负载范围内实现了所有开关管的零...     

直流母线串联辅助电路的谐振直流环节逆变器

为实现一种结构简单,控制方便,高效率,高功率密度的逆变器,提出了一种新型谐振直流环节软开关逆变器的拓扑结构。通过在传统硬开关逆变器的直流环节添加串联在直流母线上的辅助谐振单元,使直流母线电压周期性地归零,可以实现逆变桥主开关器件的零电压开关,而且辅助开关器件可以实现零电流开通和零电压关断。此外,辅助谐振单元只有一个辅助开关,硬件成本低。分析了电路的换流过程和设计规则,并建立起辅助谐振电路损耗的数学模型,讨论了谐振参数对辅助电路损耗的影响。制作了一个1 k W的实验样机,实验结果表明逆变器的主开关和辅助开关器件都实现了软开关,所以该软开关逆变器能有效地降低开关损耗和提高效率。     

一种高效倍压升压型软开关功率因数校正电路

提出一种高效零电压转换倍压升压型变换器的功率因数校正电路。新型软开关技术可以实现整流器主开关和无源开关零电压转换,而辅助开关零电流通断。所述软开关技术没有增加电路主开关的电压和电流应力。由于所用电路主电路导通流经更少的半导体功率器件,因此具有较少的器件导通损耗。该电路结构适合低压输入和中高功率应用场合。计算机仿真和实验样机验证了理论预期。该样机实现转换效率高达97%,功率因数为0.992。     

基于改进SPWM控制的新型单级BUCK-BOOST逆变器

提出了一种新型的单级串联谐振型Buck-Boost逆变器，它能在一个功率级内产生峰值高于或低于输入直流电压的正弦交流电压。文中详细分析了所提逆变器的工作原理，并利用状态空间平均法建立了系统数学模型。基于断续导电模式，所提逆变器拓扑利用串联谐振单元实现所有开关的零电流开通和辅助开关的零电流关断，减小了开关损耗，提高了系统效率。为了改善逆变器的输出特性，提出一种改进的SPWM控制方法，该方法采用带直流偏置的正弦调制波，消除了线性近似法所导致的输出电压波形过零点附近的畸变。通过一台1kW原理样机的实验结果，验证了该变换器的优点和改进SPWM控制方法的有效性。     

一种新型无刷直流电机谐振极软开关逆变器

永磁无刷直流电机具有高功率密度、高转矩/电流比和控制简单等优势,得到了广泛应用。然而,无刷直流电机通常采用硬开关逆变器驱动,硬开关逆变器的系统效率较低,散热器的体积和重量较大,限制了大功率无刷直流电机驱动系统功率密度和性能的进一步提升。针对硬开关逆变器问题,提出了一种无刷直流电机专用的谐振极软开关电压源逆变器。通过在传统硬开关逆变器的三相输出端添加辅助谐振网络,实现了逆变桥主开关器件的零电压(ZVS)开关动作,辅助双向开关在零电流开关(ZCS)条件开通和关断。针对新型软开关逆变器,提出了一种新的脉宽调制(PWM)控制策略——TPWM TON,逆变桥上下侧开关器件轮流进行PWM调制,保持了直流母线中点电位的平衡,且使主开关和辅助开关的开关频率降到PWM调制频率的一半。对提出的软开关逆变器进行了实验研究,实验结果验证了电路结构、理论分析和控制策略的正确性与可行性。     

A novel active auxiliary circuit for efficiency enhancement integrated with synchronous buck converter

In this paper, a novel auxiliary circuit is introduced for the synchronous buck converter. This auxiliary circuit provides zero‐current, zero‐voltage switching conditions for the main and synchronous switches while providing zero‐current condition for the auxiliary switch and diodes. The proposed active auxiliary circuit integrated with synchronous buck converter that emanates to zero‐voltage transition (ZVT)–zero‐current transition (ZCT) pulse width‐modulated (PWM) synchronous buck converter is analyzed, and its operating modes are presented. The additional voltage and current stresses on main, synchronous and auxiliary switches get decimated because of the resonance of the auxiliary circuit that acts for a small segment of time in the proposed converter. The important design feature of soft‐switching converters is the placement of resonant components that mollifies the switching and conduction losses. With the advent of ZVT–ZCT switching, there is an increase in the switching frequency that declines the resonant component values in the converters and also constricts the switching losses. The characteristics of the proposed converter are verified with the simulation in the Power Sim (PSIM) software co‐simulated with MATLAB/SIMULINK environment and implemented experimentally. Copyright © 2016 John Wiley & Sons, Ltd.     

新型谐振直流环节软开关逆变器

为了提高开关变换器的效率和增强性能,提出了一种新的谐振直流环节软开关电压源逆变器,通过在传统硬开关逆变器的直流环节添加辅助谐振单元,使直流环节电压周期性出现零电压凹槽,实现逆变桥开关器件在零电压条件下的切换,减小了开关损耗和二极管的反向恢复损耗。同时,辅助谐振单元的开关也为零电流或零电压条件下的软开关操作。详细阐述了该软开关逆变器拓扑的工作原理和动作模式,并对软开关动作时序的瞬态过渡过程进行了数学分析。最后,对提出的新型软开关逆变器驱动三相R-L负载进行了仿真研究,仿真结果验证了电路结构和理论分析的正确性与可行性。     

可升压自然软开关变流器

该文提出一种能应用于DC-AC、AC-DC-AC、AC-DC、和DC-DC电能变换的新型电能变化策略。采用该策略的变流器与对应的传统硬开关变流器相比，在直流储能环节的回路中增加一个辅助开关，通过适当的控制可实现：DC电压提升；辅助开关零电压零电流工作；传统变流器更多开关工作在零电压零电流状态。该文通过对一个新型两电平DC-AC三相逆变器的分析来详细阐述此类变流器的基本工作机理，并通过实验加以验证。     

两电平和三电平逆变器的新模块化似零电压软换流电路的分析和设计

提出了一个直流负总线辅助谐振电路(NBARC)与新型直流侧谐振电路镜像对称对模块设计, 用以实现两电平和三电平逆变器的软换流.NBARC的电路拓朴减少了功率器件的数目并降低了对器件的功率额定值的要求.为两电平逆变器零电压开关设计并分析了基本NBARC谐振电路,这个电路拓朴和模块设计方法被扩展到一个谐振模块镜像对称对电路,用以钳夹直流侧电压,并实现三电平逆变器的软换流.提出软换流允许在似零电压状态下实现,并分析了残余换流电压对于逆变器开关损耗的影响.模块方法允许软开关电路被设计成标准逆变器的可选附加块,可以把传统的逆变器转变为软开关逆变器.实验结果验证了电路分析和实现.     

一种新型的零电压谐振极型逆变器

为实现一种结构简单，高效，高频，低的电压应力，易于控制的软开关三相逆变器。该文提出一种新型的三相谐振极逆变器，它可以实现逆变器主开关的零电压开通，辅助开关管的零电流开关，谐振电路功率小，与传统的辅助谐振变换极逆变器(ARCPI)不同，它避免了ARCPI使用的2个大电容，也没有中性点电位的变化问题。与三角形或星型谐振吸收逆变器(RSI)的三相谐振电路之间互相耦合不同，它的三相之间是互相独立的，这就使得逆变器易于应用各种控制策略。该文选取一相电路，对其工作原理进行了分析，给出了在不同工作模式下的等效电路图，仿真和实验结果都验证了原理的正确性。     

A novel prototype of auxiliary edge resonant bridge leg link snubber‐assisted soft‐switching sine‐wave PWM inverter

This paper proposes a new circuit topology of the three‐phase soft‐switching PWM inverter and PFC converter using IGBT power modules, which has the improved active auxiliary switch and edge resonant bridge leg‐commutation‐link soft‐switching snubber circuit with pulse current regenerative feedback loop as compared with the typical auxiliary resonant pole snubber discussed previously. This three‐phase soft‐switching PWM double converter is more suitable and acceptable for a large‐capacity uninterruptible power supply, PFC converter, utility‐interactive bidirectional converter, and so forth. In this paper, the soft‐switching operation and optimum circuit design of the novel type active auxiliary edge resonant bridge leg commutation link snubber treated here are described for high‐power applications. Both the main active power switches and the auxiliary active power switches achieve soft switching under the principles of ZVS or ZCS in this three‐phase inverter switching. This three‐phase soft‐switching commutation scheme can effectively minimize the switching surge‐related electromagnetic noise and the switching power losses of the power semiconductor devices; IGBTs and modules used here. This three‐phase inverter and rectifier coupled double converter system does not need any sensing circuit and its peripheral logic control circuits to detect the voltage or the current and does not require any unwanted chemical electrolytic capacitor to make the neutral point of the DC power supply voltage source. The performances of this power conditioner are proved on the basis of the experimental and simulation results. Because the power semiconductor switches (IGBT module packages) have a trade‐off relation in the switching fall time and tail current interval characteristics as well as the conductive saturation voltage characteristics, this three‐phase soft‐switching PWM double converter can improve actual efficiency in the output power ranges with a trench gate controlled MOS power semiconductor device which is much improved regarding low saturation voltage. The effectiveness of this is verified from a practical point of view. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 155(4): 64–76, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20207     

基于NCP1252光伏逆变器辅助电源的应用

提出了一种宽输入电压范围的双管反激式开关电源作为光伏逆变器辅助电源方案。该开关电源具有多路直流输出,通过调节控制芯片输出脉冲的频率以适应直流输入在较大范围内变化,为光伏并网逆变器的开关器件驱动及控制电路提供稳定的直流电压。介绍了具有功能集成度高、价格低的NCP1252 PWM控制芯片的特性。分析了双管反激拓扑原理及优点,设计了变压器以及各关键电路。试验表明,辅助电源适应光伏逆变器输入直流电压的大范围波动,输出直流电压纹波在可以接受的范围内,可为光伏逆变器长期运行可靠供电。     

Pulse current regenerative resonant snubber‐assisted two‐switch flyback‐type ZVS PWM DC‐DC converter

In this paper, a two‐switch high‐frequency flyback transformer‐type zero voltage soft‐switching PWM DC‐DC converter using IGBTs is proposed. Effective applications for this power converter can be found in auxiliary power supplies of rolling stock transportation and electric vehicles. This power converter is basically composed of two active power switches and a flyback high‐frequency transformer. In addition to these, two passive lossless snubbers with power regeneration loops for energy recovery, consisting of a three‐winding auxiliary high‐frequency transformer, auxiliary capacitors and diodes are introduced to achieve zero voltage soft switching from light to full load conditions. Furthermore, this power converter has some advantages such as low cost circuit configuration, simple control scheme, and high efficiency. Its operating principle is described and to determine circuit parameters, some practical design considerations are discussed. The effectiveness of the proposed power converter is evaluated and compared with the hard switching PWM DC‐DC converter from an experimental point of view, and the comparative electromagnetic conduction and radiation noise characteristics of both DC‐DC power converter circuits are also depicted. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(3): 74–81, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20081     

An active‐clamping zero‐voltage‐switching flyback converter with integrated transformer

This paper proposes an active‐clamping flyback converter using an integrated transformer. The proposed converter is composed of two active‐clamp flyback converters. The presented converter can balance the total load current between secondary sides of two transformers so that the rectifier diode conduction loss is reduced. Also, the main switch of one converter is the auxiliary switch for the other converter, so that only two switches are required and both can achieve zero‐voltage‐switching operation. The two transformers are integrated into one magnetic core; therefore, the volume and copper loss of transformer can be reduced. Detailed analysis and design of this integrated magnetic active‐clamping flyback converter are described. Experimental results are recorded for a prototype converter with an AC input voltage ranging from 85 to 135 V, an output voltage of 24 V and an output current of 5 A, operating at a switching frequency of 100 kHz. Copyright © 2014 John Wiley & Sons, Ltd.     

用于无刷直流电机驱动的谐振极软开关逆变器

用硬开关逆变器来驱动无刷直流电机会产生逆变器的开关损耗大和运行效率低的问题。为降低开关损耗,提出一种用于无刷直流电机驱动的新型谐振极软开关逆变器的拓扑结构,通过在传统硬开关逆变器的三相输出端添加辅助谐振电路,利用辅助电路中的高频变压器的等效电感与主开关并联的缓冲电容之间的谐振,实现逆变器主开关器件的零电压开关和辅助开关器件的零电流开关。依据不同工作模式下的等效电路图,分析了电路的换流过程和设计规则,并建立起了辅助谐振电路损耗的数学模型,讨论了谐振参数对辅助电路损耗的影响。制作了1台实验样机,实验结果表明逆变器的主开关和辅助开关都实现了软开关。该谐振极软开关逆变器能有效改善效率,降低开关损耗。     

电机驱动用新型谐振直流环节电压源逆变器

为了实现电机控制系统的高功率密度和高性能运行,必须提高逆变器的工作频率以提高功率变换器的效率和增强性能。然而,较高的工作频率会引起严重的电磁干扰和开关损耗从而导致系统整体效率降低。软开关技术被认为是解决上述问题的有效方法,结合软开关技术的优点和脉宽调制(pulse width modulation, PWM)控制的特点,提出了一种新的用于电机驱动系统的谐振直流环节软开关电压源逆变器,通过在传统硬开关逆变器的直流环节添加辅助谐振单元,实现了逆变桥开关器件的PWM软开关动作,同时,辅助谐振单元的开关也为软开关操作。文中阐述了该软开关逆变器拓扑的动作时序和动作模式,并对软开关动作时序的瞬态过渡过程进行了数学分析。对提出的新型软开关逆变器驱动无刷直流电机进行了仿真和实验研究,结果验证了电路结构和理论分析的正确性与可行性。