双输出DC—DC变换器：集成电路—MAX742

双输出ＤＣ—ＤＣ变换器集成电路──ＭＡＸ７４２方佩敏由ＭＡＸ７４２组成的ＤＣ—ＤＣ变换器电路输人电压为十ＳＶ，输出电压为土１２Ｖ或土１５Ｖ（可选），允差为士４％，负载电流可达ＺＡ，功率可达３Ｗ～６０Ｗ，效率高于ｍ％。它的外围元件少、工作频率高（１００...     

小型化隔离型DC／DC变换器DCP0124及其应用

小型化隔离型ＤＣ／ＤＣ变换器ＤＣＰ０１２４及其应用杨振江余进ＤＣＰ０１２４系列是一种高效率、小型化、隔离型ＤＣ／ＤＣ变换器，输出功率可达１Ｗ，还可通过多个并联增大功率，此外可通过看门狗电路实现过热和过载保护，并能对容性负载实现全功率输出，广泛应用于电...     

用1.5MHz电流型PWM控制器组成的50W DC／DC变换器

本文介绍了１．５ＭＨｚ电流型ＰＷＭ控制器ＵＣ３８２５在５０ＷＤＣ／ＤＣ变换器中的应用。该ＤＣ／ＤＣ变换器采用推挽电路，输入电压为＋４８Ｖ，输出电压为＋５Ｖ，输出电流为１０Ａ，在通信设备中得到了广泛的应用。新型脉宽调制器ＵＣ３８２５具有更快的开关速度和更好的动态特性，因而可减小磁性元件的体积。本文讨论了磁芯尺寸、磁芯材料和磁通密度的选择方法，还分析了整个电路的功耗对ＤＣ／ＤＣ变换器总效率的影响。     

由六反相器构成的DC/DC变换器

上图所示的电路用一个ＴＴＬ六反相器即可构成 ＤＣ／ＤＣ变换器,将５Ｖ变成１２Ｖ。该电路提供了ＤＣ／ＤＣ变换所需的所有功能。 该电路依靠 ＴＴＬ开关门限调节电压。 Ｕ１Ａ和Ｕ１Ｂ形成振荡器,其开关频率＜１ＭＨｚ。振荡器的输出驱动三个并联的反相器 Ｕ１Ｃ、 Ｕ１Ｄ和 Ｕ１Ｅ,可提供较高的输出电流和输出功率。其内部输出晶体管、Ｌ１和 Ｄ１形成标准的升压转换器,当其输出为低时,电流只流过电感Ｌ１;当其输出变高时,储存在电感中的能量迫使Ｄ１的阳极变高,Ｄ１导通对Ｃ１充电。 Ｕ１Ｆ监视输出电压在反馈电阻 Ｒ１和 Ｒ２…     

输出可调的小功率DC—DC变换器LP2950／2951

输出可调的小功率ＤＣ－ＤＣ变换器ＬＰ２９５０／２９５１西安邮电学院李哲１．概述ＬＰ２９５０／ＬＰ２９５１为小功率稳压器，静态电流小（典型值７５μＡ），输入输出压差低（典型值：轻负载时为４０ｍＶ，负载１００ｍＡ时为３８０ｍＶ），适合电池供电系统，当电池...     

HIP5061型高效率大功率DC—DC变换器

ＨＩＰ５０６１是一种高效率、高性能、大功率电流型ＰＷＭ控制器，可组成多种类型的直流－直流（ＤＣ－ＤＣ）变换器，本文简要介绍了它的电气性能、工作原理和典型应用电路。     

一种高性能多路输出DC／DC变换器的研制

西方阐述了ＭＦ２８Ｍ７０Ｐ型ＤＣ／ＤＣ变换器组件的工作原理，并介绍了多路输出ＤＣ／ＤＣ变换器在实现过程中的一些相关问题。     

高电压输出小型DC／DC变换器的设计

本文介绍了一输出电压为１６０Ｖ的小型ＤＣ／ＤＣ变换器的电路设计及产品性能。并详细叙述了这种开关型ＤＣ／ＤＣ变换器中，高频升压变压器的设计方法以及为抑制噪声，提高电路保护能力所采取的措施措施。     

提高低电压DC—DC变换器效率的同步整流技术

提出了一种新的同步整流方案，采用ＭＯＳＦＥＴ与肖特基二极管并联组合的方法构造同步整流结构，因而控制简单，工作稳定可靠。理论和实验结果表明，文中所述方法可显著提高电压ＤＣ－ＤＣ变换器效率，适合于混合集成。     

高功率同步DC／DC控制器

ＬＴ１３３９是一种高功率同步电流模式开关稳压控制器。此ＩＣ驱动双Ｎ沟ＭＯＳＦＥＴ，为高功率ＤＣ／ＤＣ变换器６０Ｖ应用提供一单片ＩＣ解决办法。它具有可编程平均电流限制，允许精确的ＤＣ负载电流限制，与电感器波纹电流无关。时钟振荡器工作频率是可编程的而且可...     

A Novel FPSM Controller for DC-DC Switching Converters

This paper presents a novel fuzzy pulse skip modulation （FPSM） controller for switching direct current to direct current （DC-DC） converters based on fuzzy ratiocination modeling approach. Owing to the optimal consideration during the design and the nonlinear characteristics of the controller, improved dynamic responses of the FPSM controller can be achieved over conventional controllers. Compared with conventional proportion integral derivative （PID） control, FPSM control has 60% lower overshoot and 10% lower setting time under the same input voltage and output load change. The presented approach is general and can be applied to other types of DC-DC converters.     

A single-phase converter with a high-frequency current-sourced link

Duality relationships that have proved useful in the development of DC-DC converter topologies are applied to existing voltage stiff high-frequency link force-commutated converters. This new area of application of the duality concept results in the development of new current stiff link converters that retain the advantages of current fed DC-DC converters. The requirements on the converters enforced by the need for instantaneous balance of input and output powers are examined. A current control technique has been developed that controls the charge delivered to the load during each switching cycle. This allows a wide bandwidth voltage regulator to be applied. Finally, the results obtained with a low-power prototype and a reactive load are presented. The new converter requires only four power MOSFETs and relatively simple controls and is reversible     

A topology survey of single-stage power factor corrector with aboost type input-current-shaper

A topological review of the single stage power factor corrected (PFC) rectifiers is presented in this paper. Most reported single-stage PFC rectifiers cascade a boost-type converter with a forward or a flyback DC-DC converter so that input current shaping, isolation, and fast output voltage regulation are performed in one single stage. The cost and performance of single-stage PFC converters depend greatly on how its input current shaper (ICS) and the DC-DC converter are integrated together. For the cascade connected single-stage PFC rectifiers, the energy storage capacitor is found in either series or parallel path of energy flow. The second group appears to represent the main stream. Therefore, the focus of this paper is on the second group. It is found that many of these topologies can be implemented by combining a two-terminal or three-terminal boost ICS cell with DC-DC converter along with an energy storage capacitor in between. A general rule is observed that translates a three-terminal ICS cell to a two-terminal ICS cell using an additional winding from the transformer and vice verse. According to the translation rule, many of the reported single-stage PFC topologies can be viewed as electrically equivalent to one another. Several new PFC converters were derived from some existing topologies using the translation rule     

Novel sliding valley current mode pulse train control for switching DC-DC converter

ABSTRACT

Multi valley current mode pulse train (MVC-PT) control technology can completely eliminate the low-frequency oscillation phenomenon of DC-DC switching converters operated in continuous conduction mode (CCM). However, this method needs to increase the number of preset value to broaden the output power range, which will increase the complexity and cost of the controller, and reduce the robustness of the system. Meanwhile, the output voltage ripple is uncontrollable and varied with the changes of the load. In this paper, a novel sliding valley current mode PT (SVC-PT) control technique is proposed to solve the above-mentioned problem. The SVC-PT operating principle and the deficiency of MVC-PT method are analysed in details. The approximate discrete-time models of SVC-PT and MVC-PT controlled switching DC-DC converters are constructed and compared. The comparison results verify that the proposed control method can thoroughly lessen the restriction of the controller on the output power range. Moreover, the control circuit is simplified and the output voltage ripple can be controlled. Finally, the simulation and experimental results are present to prove the feasibility and scientific of SVC-PT control technology.     

一种自适应斜坡补偿电路的设计与实现

提出了一种应用于电流型DC-DC转换器的自适应斜坡补偿电路.在分析斜坡补偿原理的基础上,提出了一种动态的斜坡补偿方法.该方法利用跨导线性环电路对补偿电流信号进行叠加,无需外加引脚引入输出电压,从而减小了芯片封装尺寸,以较少的电路使引入的斜坡补偿对系统带载能力和瞬态响应的负面影响减至最小.此电路采用UMC BCD工艺,在升压型DC-DC转换器2V转换8V的条件下,带载能力达到300mA,负载调整率为6.7mV/A.     

A planar 4.5-GHz DC-DC power converter

In this paper, we present two DC-DC converters that operate at a microwave frequency. The first converter consists of a class-E switched-mode microwave amplifier, which performs the DC-AC conversion, and two half-wave diode rectifier outputs. The class-E MESFET amplifier has a minimum power-added efficiency of 86%, corresponding drain efficiency of 95%, and 120 mW of output power at 4.5 GHz. The diode rectifier has a maximum conversion efficiency of 98% and an overall efficiency of 83%. The second converter consists of a high-efficiency class-E oscillator and a diode rectifier. The class-E oscillator has a maximum efficiency of 57% and maximum output power of 725 mW. The DC-DC converter is planar and compact, with no magnetic components, and with a maximum overall DC-DC conversion efficiency of 64% for a DC input of 3 V, and the output voltage across a 87-Ω load of 2.15 V     

The design and experimentation of the new cascaded DC-DC boost converter for renewable energy

After renewable energy generated, a direct current value is converted to a direct current value at another level for a power electronics and power system application that is often considered. In this article, the design and application of a new generation multi-time cascaded DC-DC converter are discussed. The dc-to-dc converter is three-levels, and the switches for each step have a working time and a non-working time. Mathematical models are established depending on the relationship between current and voltage according to the operating and non-operating states of the switches at each stage. After these mathematical models are creating, the new generation multi-timed DC-DC converter is run in Matlab Simulink and simulation results are validated in experimentation. The output voltage and inductor current are observed with a scope. Then, the results from the proposed converter are compared with the results of the traditional converters. The results show the effectiveness of the proposed dc-dc converter.     

用降压型单电感多输出DC-DC变换器输出高电压

本文发现并证明了降压型单电感多输出DC-DC变换器当电感工作于连续导通模式下能够产生高于电源电压的输出。这个发现将降低需要同时输出高压和低压的DC-DC变换器的结构复杂性。本文实现了一个降压型结构的单电感双输出的直流变换器,供电电压3.3V,输出为1V和4V。实验结果很好的证明了本文的结论。     

A lossless active clamping circuit for current doubler topologies

This letter presents a new lossless clamping circuit on the secondary side for DC-DC converters with a current-doubler structure. This circuit reduces ringing on secondary-side rectifiers due to leakage inductance. The ringing loss is recovered to the load. As a result, efficiency is improved, and the voltage stress on secondary-side rectifiers is reduced significantly. These improvements allow DC-DC topologies with a current doubler to operate efficiently at high switching frequencies. The operating principle of the clamping circuit is detailed. Simulations and experimental results validate the proposed technique.     

Closing a Second Feedback Loop in a DC–DC Converter Based on a Piezoelectric Transformer

Nowadays, piezoelectric transformers (PT) are a good alternative to substitute magnetic materials in AC/DC and DC-DC converters. They have high isolation voltage and operate at higher frequencies than magnetics, with lower losses. However, their optimum operating frequency exhibits a strong dependence on different parameters, such as temperature, load, or even voltage level applied. This is usually an inconvenience, because this drift affects PT gain and efficiency, which can vary enormously within a few hundred of hertz. On the other hand, not only is it necessary to ensure the PT is driven at the proper frequency - in terms of gain and efficiency, including zero voltage switching in the power stage - output voltage must also be regulated. In this paper, two simple feedback loops are implemented in a PT-based DC-DC converter. One of them adjusts the switching frequency to obtain the best gain and efficiency. The other one performs the output voltage regulation.