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。     

三路输出DC／DC变换器的研制

本文阐述了HHJ28T515型三路输出DC/DC变换器的设计方案、工作原理、采用的工艺及解决的关键技术问题。     

DC／DC变换器中变压器（电感）制作工艺的改进

本文简述了ＤＣ／ＤＣ变换器中变压器的制作工艺，并对影响变压器的工艺因素进行了探讨及改进。     

升压式DC／DC变换器的关断措施

便携式电子产品要求尺寸小、重量轻、耗电省等要求,但电池在产品中所占的空间较大,与其它元器件相比,重量也最重,因此在一些小巧的便携式电子产品中,为减少电池数往往采用升压式DC/DC变换器以满足尺寸小,重量轻的要求。近年来,各半导体器件公司     

混合集成DC／DC变换器用变压器的制作技术

本文分析了混合集成DC/DC变换器中的变压器磁性材料特性，并介绍了变压器制作工艺流程和相关的工艺材料。     

四路输出DC／DC变换器的研制

本文阐述了ＨＴＫ２８Ｍ１５７型四路输出ＤＣ／ＤＣ变换器的设计方案，工作原理，采用的工艺及解决的关键技术问题。     

航天器DC／DC变换器的可靠性设计

卫星用DC/DC变换器的高可靠和长寿命,是确保其完成飞行使命的基本条件之一.但人们对DC/DC变换器可靠性的认识通常集中在元器件固有质量或产品组装工艺缺陷方面,往往忽略了系统设计(包括技术方案和电路拓扑设计、输入/输出接口设计、环境试验条件适应性设计等)缺陷和电压、电流和温度应力对可靠性的影响.     

厚膜混合集成不对称双路输出DC／DC变换器的研制

本文介绍了两路输出功率不等的小功率ＤＣ／ＤＣ电源的设计思想，重点阐述了利用耦合电感的预稳作用及低压差方式实现负路稳压的电路工作原理。     

A current-tripler dc/dc converter

This paper proposes a novel zero-voltage-switching (ZVS) current-tripler dc/dc converter. Compared to the conventional phase-shifted ZVS full-bridge dc/dc converter with current-doubler rectifier, the proposed current-tripler dc/dc converter reduces the synchronous rectifier (SR) conduction loss as well as the transformer winding loss. Furthermore, the proposed transformer structure is very compact, and thus the power density of the converter could be greatly increased. Analysis and experimental results show that the proposed topology offers great advantages when the converter output current goes higher and the voltage goes lower, as demanded by future microprocessors and telecommunications systems. A 48-V/1.0-V, 100-A, 300-kHz prototype is implemented, and the experimental results show that it can achieve 87% efficiency at full load.     

新型引脚技术提升了DC/DC转换器的性能和可靠性

DC/DC转换器制造商C&DTechnologies公司(位于美国亚利桑那州图森)开发的PositionPerfect引脚技术消除了元件在组装时发生移动的可能性,从而使无引线SMTDC/DC转换器的机械安装整体性和精确性均有所提高。与传统技术相比,此项技术还能够使转换器引脚提供更高的电流,从而确保将满载的额定电流输送至主PC电路板上。该技术运用了SMT互连,这种SMT互连采用了由高速自动模锻工艺固定在转换器上的独特铜柱。在模锻处理之后进行的修剪形成了极端平整的表面,从而确保了引脚的共面误差小于0.004英寸,并且消除了元件的移动。将引脚固定在转换器…     

在300mV供电电压下工作的JFET DC／DC转换器

使用JFET的自偏置特性可以建立一个DC/DC转换器,它能用太阳能电池、热电偶和单级燃料电池等电源工作,这些电源电压都低于600 mV,有的甚至低至300 mV。     

A prognostic method for predicting failure of dc/dc converter

The failure of dc/dc converters can directly result in electronic systems working unconventionally or significant downtime. To pre-determine time to failure and generate substantial safety and cost benefits, it is necessary to assess the extent of deviation of dc/dc converters from its expected state of health in real time and predict time to failure in advance. This paper presents a novel prognostic method for predicting the time to failure of dc/dc converters. The process involves identifying precursor parameters, determining prognostic of failure, and determining a criterion for predicting time to failure. The output voltage is used as a precursor parameter and directly monitored when the converter with a given load periodically operates at different temperature stresses. The phenomenon that the differences of output voltages collected at different temperature stresses begin to increase with a large (or small) fluctuation is detected in collected output voltages. This phenomenon is identified as a prognostic of failure. A percentage of the initial difference is used as the criterion for predicting time to failure. A case study is given to illustrate the procedure that how to monitor output voltages, detect prognostic and predict time to failure. The results show the health state could be assessed in real time and the time to failure could be predicted in advance. Furthermore, the deviation of the predicted time to failure from the actual time to failure could meet the demand of a considered acceptable range in engineering practice.     

Single-stage line-coupled ac/dc converter with high power factor and ripple-free input current

Single-stage line-coupled ac/dc converter with high power factor and ripple-free input current is proposed. The proposed power factor correction circuit can achieve high power factor and ripple-free input current using a coupled inductor. Experimental results for a 400?W converter at a constant switching frequency of 100?kHz are obtained to show the performance of the proposed converter.     

DC／DC变换器中的噪声管理

零电流开关器件产生的谐波和寄生噪声较少,适合于噪声敏感型用途     

A forward converter topology with independently and precisely regulated multiple outputs

A forward converter topology with independently and precisely regulated multiple outputs is presented in this paper. In this topology, each regulated output has its own feedback control circuit that controls the appropriate synchronous rectifiers in the pertinent output stage. All output circuits are voltage-decoupled from each other, and the cross-regulation between the outputs is eliminated. Steady state analysis as well as small signal modeling is performed to understand the topology and to provide design guidance. A prototype circuit with two outputs is built, and experimental results are presented for proof-of-concept.     

使DC/DC变换器限流特性线性化的热敏电阻器网络

最近推出的各种集成式降压DC/DC变换器均已采取对外接低侧MOSFET同步整流器的电压降采样的方法,无需高侧电流检测电阻器。这种拓扑节省了检测电阻器的成本和印制电路板的空间,也适当提高了电路效率。但是,MOSFET的导通电阻与温度有很大的相关性,它决定了限流大     

AC／DC电源

这里是最近新推出的一些AC/DC电源     

Transformerless Single-Phase Multilevel-Based Photovoltaic Inverter

The elimination of the output transformer from grid- connected photovoltaic (PV) systems not only reduces the cost, size, and weight of the conversion stage but also increases the system overall efficiency. However, if the transformer is removed, the galvanic isolation between the PV generator and the grid is lost. This may cause safety hazards in the event of ground faults. In addition, the circulation of leakage currents (common-mode currents) through the stray capacitance between the PV array and the ground would be enabled. Furthermore, when no transformer is used, the inverter could inject direct current (dc) to the grid, causing the saturation of the transformers along the distribution network. While safety requirements in transformerless systems can be met by means of external elements, leakage currents and the injection of dc into the grid must be guaranteed topologically or by the inverter's control system. This paper proposes a new high-efficiency topology for transformerless systems, which does not generate common-mode currents and topologically guarantees that no dc is injected into the grid. The proposed topology has been verified in a 5-kW prototype with satisfactory results.