基于耦合电感倍压单元的零输入电流纹波高增益非隔离变换器

提出一种基于耦合电感倍压单元的零输入电流纹波非隔离型高增益DC-DC变换器。该变换器由零输入电流纹波Boost变换器和耦合电感单元组成,通过设计耦合电感电压比,实现了高升压增益特性。同时,采用无源无损吸收电路消除了漏感引起的开关管两端电压尖峰,降低了开关管的电压应力。通过增加由电容和二极管组成的倍压单元,进一步减小了开关管的电压应力,同时消除了输出二极管的电压尖峰,降低了二极管电压应力。因此,可通过选取低导通电阻、低电压等级的MOSFET,以降低变换器成本和开关管的导通损耗,提高变换器的效率。此外,还实现了变换器的零输入电流纹波,降低了输入滤波器的设计难度。文中详细分析了该变换器的工作原理及工作特性,给出了关键参数的设计原则。最后,通过实验结果验证了理论分析的正确性。     

耦合电感倍压单元的高增益DC/DC变换器

根据二次型Boost变换器、耦合电感和倍压单元,提出耦合电感倍压单元高增益DC/DC变换器。通过在后级Boost电路单元中引入耦合电感,以降低开关管的电压应力;耦合电感次级连接倍压单元,通过输出端叠加以提高变换器的电压增益。由二极管和电容组成的无源无损吸收电路可减少由漏感引起的开关管两端的电压尖峰。详细分析了该变换器的工作原理及工作特性。最后,通过实验结果验证了理论分析的正确性。     

一种高效、高升压电压比单开关直流升压变换器

在基本升压变换器的基础上引入耦合电感和开关电容倍压单元,研究了一种高增益升压变换器。该变换器具有以下特点:①相对于传统的耦合电感Boost变换器,其电压增益得到了有效提高;②耦合电感的一次侧采用无源吸收电路,既具有吸收耦合电感漏感能量的功能,又可以提高变换器的电压增益,有利于扩展开关管的工作占空比范围;③在耦合电感的二次侧采用开关电容倍压单元,既能进一步提高变换器的电压增益,又使功率器件的电压应力钳位在较低的电压水平,因此可以选择低导通电阻、低电压等级的开关器件,有利于提高变换器的效率。详细分析了该变换器的工作原理及稳态特性,最后搭建了一台实验样机,验证了理论分析的正确性。     

基于耦合电感的高增益升压DC-DC变换器的研究

传统的基于耦合电感的DC-DC变换器由于电压增益低、开关管两端电压尖峰高和输出二极管存在反向恢复等问题,应用在可再生能源如光伏和燃料电池上产生的电压较小.为了解决这些问题,提出一种利用耦合电感的新型升压DC-DC变换器.该变换器采用一个带二极管和电容单元的耦合电感,二极管和电容形成的倍压单元能有效吸收漏感,降低开关管的...     

基于新型耦合电感倍压单元的高增益变换器

提高直流变换器的电压增益可以增加变换器的输入和输出电压范围,使其应用场合更加广泛。本文提出两种具有高增益的耦合电感倍压单元,通过改变耦合电感的匝比N可以大幅提高变换器的电压增益。分析了CLC和LCL耦合电感倍压单元的工作原理,给出了耦合电感倍压单元拓扑及其组合拓展结构。并将CLC耦合电感倍压单元拓扑结构应用于传统Boost电路中,分析了基于CLC耦合电感倍压单元Boost变换器工作模态,给出了变换器主要工作波形,推导了变换器的电压增益、开关管和二极管电压应力表达式。理论分析表明,CLC耦合电感倍压单元的Boost变换器具有较高的电压增益,并且开关管的电压应力并没有因为电压增益的提高而增加。实验样机采用接近全耦合的罐型磁心和漏感较大的环形磁心进行对比测试,实验结果与理论分析一致,在全耦合情况下变换器的电压增益提升最大。     

一种零输入电流纹波高增益DC-DC变换器

提出一种零输入电流纹波高增益DC-DC变换器。该变换器有两个耦合电感:一个耦合电感与电感电容组合再并入输入侧,消除了输入电流纹波,且零纹波条件与占空比无关;另外一个耦合电感实现了拓扑的高增益功能,在其二次侧加入倍压电路,电压增益得到进一步增大,由于漏感的作用,二极管的反向恢复损耗几乎为零,进而可提高变换器效率。该变换器的两个有源开关互补导通,在实现零电压开通的同时,降低了谐振产生的电压尖峰,可选择低耐压开关管来提高变换器效率。最后通过一台250W的实验样机来验证该变换器的零输入电流特性和高增益高效率特性。     

一种高增益耦合电感双管Sepic变换器

针对传统DC-DC变换器电压增益低,开关器件电压应力大和损耗高的问题,在传统Sepic变换器的基础上,引入耦合电感单元和有源开关电感单元,提出了一种高增益耦合电感双管Sepic变换器拓扑结构。该变换器具有高电压增益,避免了变换器工作在极限占空比状态,降低了开关器件电压应力,实现二极管的零电流关断和开关管的零电流开通,缓解二极管的反向恢复问题,减小开关管的损耗,提高变换器的效率。详细分析该变换器的工作原理,推导变换器的电压增益和开关器件的电压应力大小,研究漏感导致的占空比丢失问题对变换器增益的影响,给出关键参数设计,与其他拓扑在电压增益、开关器件电压应力等方面进行性能对比分析,最后设计一台100 W的实验样机,实验结果验证了理论分析的正确性。     

有源耦合电感倍压的高电压增益变换器

为了提升基本Boost变换器的电压增益,降低开关器件电压应力,提出一种基于耦合电感倍压的有源开关电感高增益变换器.变换器中两个耦合电感的原边组成有源开关电感结构,并引入二极管-电容支路作为无源钳位回路用来吸收漏感能量.利用变换器漏感等效电路模型分析了变换器工作模态,采用伏秒积平衡方法推导得到了变换器电压增益,并给出开关管和二极管电压应力.分析表明,两个耦合电感倍压单元可提升变换器的电压增益,耦合电感匝数比越大、耦合度越大,电压增益也越高,开关管的电压应力也越低.实验样机测试结果验证了理论分析的正确性,表明该变换器具有良好的电气性能.     

一种高增益DC-DC变换器实验分析

针对传统Boost升压电路受到电路元件寄生参数的影响无法实现高升压比的问题,提出了一种基于三绕组双倍压单元的新型高增益直流变换器。变换器利用二极管、电容和耦合电感构成的双倍压单元扩大电压增益,并利用无源无损吸收电路来吸收漏感能量,抑制漏感带来的尖峰电压。通过对新型变换器工作的各个模态进行详细分析,推导了电压增益及元器件电压电流应力;实验表明该新型变换器能够有效提高电压增益、降低功率开关管的电压应力。     

含耦合电感倍压单元的高增益DC/DC变换器

提出一种含耦合电感倍压单元的高增益DC/DC变换器。变换器的电压增益可通过调节耦合电感的匝比得到进一步提升。由输入电感和辅助电容可组成输入电流纹波吸收电路,通过合理配置电容参数可实现输入电流的零纹波,从而可降低滤波电感体积。变换器引入耦合电感倍压单元后,开关管不直接箝位于输出高电压,因此可实现开关管的低电压应力。此外,由箝位二极管和储能电容形成的电压尖峰吸收电路可有效降低漏感引发的开关管电压尖峰。分析了变换器的工作机理和稳态特性,并推导了零输入电流纹波满足条件和参数优化方案。最后,通过一台功率为100 W的实验样机进行了可行性验证。     

一种改进二次型高增益Boost-Sepic变换器

高增益DC-DC变换器是可再生能源发电实现高压并网的一个重要环节。提出一种改进二次型高增益Boost-Sepic变换器,既实现在较小占空比的情况下得到较高的电压增益,又降低功率MOS管与二极管的电压应力,同时还具有输入电流连续的优点;且由于二次型Boost变换器与改进Sepic升压变换器的集成,共用一个功率MOS管,变换器的主电路与控制电路均变得简单。对该变换器的工作原理和工作过程进行详细的论述,对变换器增益、功率器件、电容电压应力进行分析,并与目前常用的高增益DC-DC变换器进行对比研究。最后,在理论分析基础上,搭建了一台100 W实验样机进行实验研究,实验结论与理论分析结果一致。     

高电压增益混合型DC-DC变换器研究

随着分布式发电的出现,对高增益DC-DC变换器的要求越来越高。为了获得更高的电压增益,提出一种光伏发电用混合型高电压增益非隔离单开关DC-DC变换器。该变换器将传统的Boost和Cuk变换器并联,详细讨论了其拓扑结构、工作原理以及电路参数设计,实现了基于Matlab/Simulink的仿真研究和基于单片机的150 W实验样机。仿真研究和实验结果与理论分析吻合较好,验证了理论分析的正确性以及混合型DC-DC变换器拓扑结构的有效性。所提混合型拓扑使用元件数较少的单一功率开关,并能提供比非隔离式传统变换器更高的电压增益。该拓扑在单功率开关作用下可提供连续电流的工作模式,而且降低了功率开关和二极管的电压应力。     

Design and analysis of a high step-up single-switch coupled inductor DC-DC converter with low-voltage stress on components for PV power application

This paper presents a single-switch, high step-up, non-isolated DC-DC converter for photovoltaic (PV) power application. The proposed converter is composed of a coupled inductor, a passive clamp circuit, a voltage multiplier cell, and a voltage lift circuit. The passive clamp circuit recovers the leakage inductance energy of the coupled inductor and limits the voltage spike on the switch. Configuration of the passive clamp and voltage multiplier circuits increases the converter voltage gain. High-voltage gain without a large duty cycle, low turn ratio of the coupled inductor, low-voltage stress on the switch and diodes, leakage inductance energy recovery, and high efficiency are the main merits of the suggested DC-DC converter. Steady-state operation of the converter in continuous conduction mode (CCM), discontinuous conduction mode (DCM), and boundary condition mode (BCM) is discussed and analyzed in detail. Then, design procedure of the proposed converter is given. The presented DC-DC converter is compared with similar topologies to verify its advantages. Moreover, theoretical efficiency of the presented converter is calculated in details. Finally, simulation and experimental measurement results of 388 V-220 W prototype of the proposed DC-DC converter at 50-kHz switching frequency are presented to verify its performance.     

基于开关电容和耦合电感的交错并联型高电压增益双向DC-DC变换器

提出一种基于开关电容和耦合电感的交错并联型高电压增益双向DC-DC变换器。通过并联通道数的增加,使得变换器具有更高的电压增益、更大的输出功率和更小的器件电压/电流应力。通过引入耦合电感,不仅降低了通道内电流纹波,同时可使各通道的电感量最小,进一步提升变换器的效率和功率密度。而且,较小的电感量可加快开关电容自动均流速度,仅需简单的控制方法,有利于提高电路的可靠性和实用性。制作了一台500W样机,以验证该拓扑和理论分析的有效性。     

A New High Step-Up DC/DC Converter Structure by Using Coupled Inductor with Reduced Switch-Voltage Stress

In this paper, a new high step-up DC/DC converter for renewable energy systems is proposed, which provides high voltage gain by using a coupled inductor without having to have high-duty cycle and high-turn ratio. Moreover, the voltage gain increased by using capacitors charging techniques. In the proposed converter, the energy of leakage inductors of the coupled inductor is recycled to the load. This feature not only reduces stress on main switch but also increases the converter efficiency. Also, due to the configuration of the proposed structure, the voltage stress on the main switch is significantly reduced. Since the stress is low in this topology, low voltage switch with small ON-state resistance value can be used to reduce the conduction losses. As a result, losses decrease and the efficiency increases. Meanwhile, the main switch is placed in series with the source and it can control the flow of energy from source to load. The operating principles and steady-state analysis of the proposed converter are discussed in details. Finally, the prototype circuit with 12 V input voltage, 300 V output voltage, and 60 W output power is operated to verify its performance.     

Design and implementation of a new high step-up DC-DC converter for renewable applications

In this paper, a new structure for a DC-DC boost converter is proposed. The presented converter provides a high voltage transfer gain with lower duty cycle. Low current and low voltage stress on the switch, enlarged area of operating in continuous conduction mode (CCM), reduced size of the inductors, and the input filter are the main advantages of the proposed converter. The high voltage transfer gain with low number of elements has made it suitable to implement. Hence, using only one switch has made the control of the proposed converter easy. Besides, decreased switching losses and higher efficiency are obtained. The proposed structure is a combination of the Luo converter and a booster unit, which its analysis is studied in three modes, CCM, boundary conduction mode (BCM), and discontinuous conduction mode (DCM). Furthermore, in order to validate the analysis and feasibility of the proposed converter, the experimental results are developed on a low power prototype.     

一种应用于光伏并网发电系统的新型双输入DC-DC变换器

提出一种具有高增益低电压应力的双输入DC-DC变换器,该变换器由两个上下对称的耦合电感Boost变换器组成。具有单输入和双输入两个模式,在单输入状态下只有一个开关管工作;在双输入状态下两个开关管工作。新型变换器可以通过改变耦合电感的匝比来提升变换器电压增益;输出端采用三电平结构使变换器开关管和二极管电压应力减小。分析了变换器在单输入和双输入模式下的工作模态;给出了变换器主要工作波形;推导了变换器电压增益,开关管和二极管电压应力,分析了漏感对变换器的电压增益的影响。通过实验验证了理论分析的正确性。     

一种新型三电平双向DC-DC变换器

三电平桥式电路中开关管承受的电应力比普通桥式电路中开关管承受的电应力减小一半,结合三电平电路结构的优点,省去了传统三电平双向DC-DC变换器中的一对飞跨电容,提出了一种新型三电平双向DC-DC变换器。该新型三电平双向DC-DC变换器使电路中开关管电应力减小,谐波成分降低。利用交错移相的控制策略进行控制,使得新型变换器中所有开关管均能实现零电压开关(ZVS)。通过2.4 kW的样机试验验证,提出的新型三电平双向DC-DC变换器性能优良,与传统的双向DC-DC变换器相比,效率有了显著提升。     

Single Switch DC-DC Boost Converter using Diode-Capacitor Module and Capacitor-Inductor-Capacitor Lift

ABSTRACT–

This article presents a single switch DC-DC boost converter using diode-capacitor (DC) modules and capacitor-inductor-capacitor (CLC) lifts. This topology can step-up the voltage of battery-input sources and power the DC-voltage bus of practical applications. The output voltage is the superposition of the voltage of capacitors in each module and inductors in each lift. Operational modes in on-off state can largely increase the step-up ratio of the proposed converter. The voltage gain of the circuit has a wide range with only one switch to control the operation of it. In addition, the extended circuit with multi-module and multi-lift is also derived and analyzed in this article to expand the potential application of the proposed topology. The steady-state characteristics of the proposed circuit are presented in detail in this article. Hardware-based circuit employing one module and one lift will be tested using a battery and experimental results can verify the potential value of this design.