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In the course of design and analysis for Buck DC/DC converter, it is very important to analize the output voltage ripple formed in operating.

在Buck DC/DC变换器的分析与设计中，对开关工作时所形成的电压纹波的分析是至关重要的。

In particular, it is found that the output ripple voltage of boost and buck DC-DC converters are related to the duty ratio of input pulse.

本文提出了开关DC-DC变换器的线性空间建模法，并将其成功地用于升压型和降压型DC-DC变换器的分析，首次导出了上述两类变换器的输出纹波表达式，特别是输出纹波与控制脉冲占空比之间的关系。

The relationship between output voltage and capacitance in switched-capacitor DC-DC converter was investigated,and the reasons for output voltage ripple in the converter were analyzed.

研究了开关电容DC-DC变换器输出电压与电容的关系，分析了变换器输出电压波纹产生的原因。

The AC ripple present on DC link voltage depends on the valueof the DC link capacitor C.

在DC连接电压出现的AC波纹取决于DC连接电容器 C 的值。

To solve the above problems, a novel resonance injection type hybrid active power filter is presented, it allows the energy exchange between the DC-side capacitor and grid, DC-side voltage will be stabilized after the proposed control method base on the regulation of reactive current is adapted. On the other hand, a new current control method is proposed which is based on the control of error between injection current and harmonic current compensated by passive power filter using recursive PI.

在此基础上结合提出的基于基波无功电流闭环调节的直流侧电压控制方法，保证了直流侧电压的稳定；提出了采用递推积分将无源滤波器作用后电网谐波电流与注入支路补偿电流进行闭环比较控制以获得参考电流的方法，减小了误差，提高了系统的控制精度。

The paper is based on the project"Theoretical Research and Design of KeyTechnique for Power Management IC". And it mainly deals with the design of highefficiency synchronous Buck DC/DC converter with novel soft start IC.

本论文基于西安电子科技大学科研项目&电源管理类集成电路关键技术理论研究及设计实现&，主要研究带有新型软启动的高效同步降压型DC/DC转换器的工作原理和电路设计。

This article mainly introduces the advantage of synchronous multi-phase DC/DC converter in decreasing ripple current and increasing efficiency and gives result of simulation and practice.

像这样低电压和大电流的电源主要存在两个问题：①由于输出电压极低，很难提高电源效率；②由于负载电阻极低，若采用传统方式

This paper attempts to associate PFC technology with Quasi-Resonant DC/DC Converter and Synchronous Rectifier technology, to work out a novel switching power supply with higher efficiency and low contamination, which both achieved high power factor, improved effecting on electrical network and ensured high efficiency, furthermore, it is easy to be realized and controlled in circuit.

本文首先阐述了开关电源、功率因数校正技术和同步整流技术的发展及现状，对DC/DC变换的拓扑结构进行了选择，确定了带有隔离的准谐振(Quasi-Resonant)反激型电路，可以有效地降低损耗；接着本文对几种常见的PFC拓扑电路进行分析对比，从中选择了BOOST型电路，对工作在临界状况下的电路进行了分析，采用跟随输入电压的升压变换新技术，减小了电感体积，同时降低了开关管的电压应力，既简单又有效地实现了功率因数校正，并发现此技术值得推广；由于反激型变换器的效率一般都较低，所以本文在传统同步整流技术基础上对其加以改进，设计出一种新颖、高效的同步整流方案。

As a member of the SWIFTL317C family of dc/dc regulators, the TL317C low-input voltage high-output current synchronous buck PWM converter integrates all required active components.

作为SWIFTL317C直流/直流稳压器，该TL317C低输入电压高输出电流同步降压PWM转换器集成了所有的家庭成员需要有效成分。

The whole system, which is powered by a single 5V power, supplies steady core voltage (1.8V) and I/O voltage (3.3V) with high-efficiency synchronous step-down dc/dc converter TPS54314 and TPS54316, presents a power supply sequencing solution for dual supply voltage DSPs and includes a supervisor on the power supplies and reset circuit in order to make the system more stable and efficient.

整个供电系统采用单一的5V电源供电，用高效率的同步电压转换芯片TPS54314和TPS54316芯片分别产生TMS320C6711B DSPs的内核电压（1.8V）和周边I/O接口电压(3.3V)，同时巧妙地解决了两种供电的顺序问题，并增设了电源监控和复位电路，确保供电系统稳定、高效地工作。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。