查询词典 bulb rectifier

A synchronous rectifier Buck converter using FC-IPEM is built to test the electrical performance.

采用半桥FC-IPEM构成同步整流Buck变换器，进行了电气性能测试。

This circuit can be widely used in other topology, such as flyback converter, half bridge converter, full bridge converter and push-pull converter with synchronous rectifier.

这个电路可以推广到其他隔离变换器的拓扑中，如反激变换器同步整流、半桥变换器同步整流、全桥变换器同步整流和推挽变换器同步整流。

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。

A new type high efficiency synchronous step-up DC/DC converter for hand-held device is designed in this thesis. It works in the PFM mode, and its switching frequency can up to 500 KHz. It offers a built-in synchronous rectifier that reduces size and cost by eliminating the need for an external Schottky diode and improves overall efficiency by minimizing losses.

本文设计了一种用于移动电子设备的高效同步整流的DC/DC升压芯片，该芯片采用PFM调制方式，工作频率最高可达500 KHz，内部集成功率管作为同步整流管，代替传统的肖特基二极管，导通电阻仅有0.4？

The director's indirect direction led to the incor rect erection of the rectifier.

指导者间接的指导导致整流器的错误安装。

If so, the following three conditions are not caused by outside: Enter the loop by a diode bridge rectifier breakdown; high-voltage electrolytic filter capacitor C5, C6 was the breakdown; inverter power switch Ql, Q2 damage.

若是，则不外如下三种情况造成：输入回路中某个桥式整流二极管被击穿；高压滤波电解电容C5、C6被击穿。；逆变功率开关管Ql、Q2损坏。

This paper addresses the control problem of a variable speed wind turbine system in above rated wind speed which uses pitch angle control of the blades and delay angle control of the rectifier,with special emphasis on the differential geometric theory.

讨论了在额定风速以上时变转速风力机的控制问题，系统采用基于微分几何理论下的桨距角和触发角双输入控制。

The window in the kitchen, bulb and glass service time grow to be able to be fumed by lampblack black, not easy and abluent .

厨房里的窗户、灯泡和玻璃器皿时间一长就会被油烟熏黑，不易洗净。

We choose abortus of three to six months old as research object. In the research, we collected 35 specimen that all came from induction of labor with water bag. We successfully culture OECs from human embryo olfactory bulb by using primary culture.

一、人胚胎嗅神经鞘细胞的体外培养本研究共收集标本35例，均为3—6个月的水囊引产流产儿，采用原一代培养的方法，自人胚胎的嗅球培养出OECS。

Moreover, they tended to be induced adventitious bud and differentiation of small bulb.

以低温处理3周以上的外植体，接种后能保持原有的颜色，并且大多数外植体能保持旺盛的生长活力。

Must have Coordination and negotiation skill, flexible ideas, and be punctilious person.

必须具备较好的协调与谈判能力，头脑灵活，工作认真仔细

Result: 18 patients are all with simple eye.The pigment mole lies in nasal and temple sides of the ball conjunctiva,in which 2 lie in lacrimal caruncle and semilunar plica.

结果：18例患者均为单眼，色素痣大多数位于内外侧睑裂部球结膜面，2例位于泪阜及半月皱襞，经激光治疗后，10例色素痣消失，有5例行再次激光后消失，2例行第三次激光后消失，1例第四次激光后消失。