查询词典 DC

The Obama administration looked like a perfect mark when it came to Washington, DC, on a wave of hope and hype (Mr Obama even created the new job of "chief performance officer*").

说起华盛顿，就不得不提到欧巴马内阁，在给于憧憬与宣传方面他们似乎可以得个满分（欧巴马甚至创造了一个新工作，首席性能官）。

This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

本系统以直流电压源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达0.1V，输出电压范围为0—9.9V，最大电流为330mA，并可由液晶屏显示实际输出电压值。系统有过流保护电路，当输出电流过大时功率管自动截至，而且有红色指示灯发出警报。

Finding the solution to the problems of DC electric circuit by using Protel 99se emulation can be done first through setting up Emulation Analysis Session Block,then by the actual operation of emulation, which,superior to the other CAD software,can lead to the total solution to all the problems of DC electric circuit.

用Protel99se仿真求解直流电路问题，可以通过设置仿真分析对话框，然后运行仿真来进行。并且相对于其他电路CAD软件，可以一次性得到直流电路全部解。

When battery service life of mobile device will run out, battery output voltage will drop immediately.

行动装置的电池电量耗尽之际电压会急剧下降，此时内部DC-DC电源转换器若能正常工作，则可延长装置使用时间。

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。

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

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。

The device is to make photovoltaic cell output maximum power. It is composed primarily of two parts-Boost DC-DC circuit and maximum power point tracking controller.

该装置是为了使光伏电池输出最大功率，主要是由Boost电路和最大功率点跟踪控制器两部分组成。

This paper studies the phenomena of intermittent subharmonics and chaos in DC DC converters according to the consideration of coupling filter,consequently concludes that the origin of intermittency comes from conducted or radiated EMI.

文章从电路耦合滤波的角度考虑，分析了一类间歇分谐波与间歇混沌现象产生的原理，确定耦合电路传导和辐射干扰是产生该现象的根源，并构造了一个开关变换器模型作为研究对象，仿真与实验均得到了相似的非线性现象，同时对不同的电路参数集，讨论并分析了其对间歇现象产生所起的不同影响，为变换器的稳定设计提供信息。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。