查询词典 phase converter

The ZCS condition for lagging switches under wide load range is provided by a secondary auxiliary circuit, and an unbalanced-voltage-division flaw which inheres in ZVS half-bridges in series hybrid DC-DC converter is overcome in the proposed converter, consequently the converter is more practical.

利用副边的辅助电路在宽负载范围内实现了滞后管的零电流软开关，并克服了以前出现的ZVS半桥串联混合式直流变换器所存在的2个半桥分压不均衡的固有缺点，从而使该类拓扑更加实用。

Low-frequency instability in a single stage PFC converter is studied, which employs a cascade configuration of a boost converter and a forward converter.

研究了由Boost 变换器和Forward变换器级联构成的单级功率因数校正(power factor correction，PFC)变换器中的低频不稳定现象。

Cascade multilevel converter is made up of modules. It can be normally divided into two kinds: one with same modules and the other with different modules. This paper analyzes the relationship among the maximum number of output voltage level, the number of cascaded modules, and the input voltage ratio and THD of output voltage in different kinds of cascade multilevel converter. Then, some guidelines for making up cascade multilevel converter are given.

级联型多电平变换器类似于积木化的结构，本文按模块单元的结构形式，将级联型多电平变换器分为相同单元和不同单元两类，以输出最大电平数为目标，系统地分析模块单元个数与最大输出电平数、输入直流电压与最大输出电平数、以及输出电平数与谐波畸变率之间的关系，从中归纳得到构造级联型多电平变换器的指导原则。

A novel hybrid diode-clamp cascade multilevel converter is presented in this paper. The new concept of the converter is based on connection of multiple diode-clamp converter modules with different dc bus voltages. Normally, the voltage blocking capability of faster devices such as IGBT and the switching speed of high voltage devices like GTO are found to be limited.

该文在研究传统的级联多电平、传统混合级联多电平以及二级管钳位级联多电平变换器的基础上提出了一种新型的混合二极管钳位级联多电平变换器，这种新型变换器是将具有不同直流母线电压的多个二极管钳位多电平变换器进行级联，输出电压是将这些变换器的输出电压进行矢量相加而合成的。

Combined with the nonlinear characteristics of wind turbines and the control strategy of generator-side converter and grid-side converter, used the design method for digital PI regulator, the back-to-back PWM converter on the wind-power system with direct-driven permanent magnet synchronous generator was built in the simulink of the MATLAB.

结合风力机的非线性特性和机侧变换器与网侧变换器的控制策略，应用数字PI调节器参数设计方法，在MATLAB/simulink仿真环境下构建了基于背靠背变换器的永磁直驱风力发电系统，系统包括风力机、永磁同步发电机、变频器、电网及其电气控制部分的数学模型，仿真结果表明风电系统的PI调节器参数设计合理且系统具有良好的运行特性。

Its complete product line, fiber-optic network, both external power supply type also has built-in power type, both stand-alone also has the standard 19 rack-mount products, covering Ethernet, Fast Ethernet, Gigabit Ethernet and ATM network used in fiber-optic transceivers, fiber optic switches and fiber optic modems and other equipment. early in 1999, netLINK first time in Greater China to launch a technology leader in the industry have the adaptive function of 10/100 Fast Ethernet Media Converter (HTB -1100 series), and its excellent cost performance by customers. October 24, 2001 to 27 in Shanghai 2001 International Electronic Products Exposition and fifty-eighth session of Electronics Show , the Haitong exhibited Netlink Technologies Limited and the exclusive agent of Nufiber company, CTS Corporation a full range of fiber-optic network products, as well as Intelligent Network standard 16-slot rack-mount fiber optic media converter, RS-232/422/485 up mode / single-mode fiber converter and other new products, attracted the attention of the industry and well received by the audience and the fiber-optic network customers.

其光纤网络产品系列齐全，既有外置电源型也有内置电源型，既有独立式也有标准19机架式产品，涵盖以太网、快速以太网、千兆以太网和ATM网络用的光纤收发器、光纤交换机及光纤数据机等各种设备。1999年初，netLINK首先推出当时在大中华区业界处于技术领先的有10/100自适应功能的快速以太网媒体转换器（HTB-1100系列），并以其优异的性能价格比广受客户的欢迎。2001年10月24日至27日在上海举行的2001国际电子产品博览会和第五十八届电子产品展览会上，海通科技有限公司展出了netLINK和独家代理的Nufiber公司、CTS公司全系列的光纤网络产品以及智能网管型16槽标准机架式的光纤媒体转换器、RS-232/422/485至多模/单模光纤转换器等新产品，深深吸引了业界的注意和广受观众和光纤网络客户的欢迎。

Based on the low voltage transfer ratio of conventional matrix converter, a new matrix converter referred to as a Boost matrix converter was proposed.

针对传统矩阵变换器存在电压传输比低的问题，提出一种新型的矩阵变换器电路拓扑结构。

Dynamic large-signal, DC, and small-signal circuit models including parasitic resistances and current ripples of nonideal synchronous rectifier buck converter operating in CCM are established. Closed-loop modeling of nonideal synchronous rectifier buck converter for voltage-mode control is studied. Transfer functions are obtained. Effects of parasitic components on control loop design of the converter are explored. Systematic simulation analysis is performed. All the results show that it is necessary to include parasitic components of converters into equivalent models.

首次建立了考虑寄生电阻和电流纹波的同步整流 Buck 变换器在连续工作模式下的大信号平均模型、DC 和小信号电路模型，研究了电压控制的闭环建模，导出了传递函数，剖析了变换器的寄生参数对其控制电路设计的影响，进行了小信号特性的仿真研究，进一步阐明了考虑变换器的寄生参数建模的必要性。

The concentration of D-phenylalanine in the external phase and the separation factorαcan be expressed as: The diffusion of boundary layer in outer aqueous phase is the controlled process while the concentration of D-phenylalanine in the external phase far less than the concentration of chiral carrier in the emulsion liquid membrane phase, then the diffusion coefficient k_e of boundary layer in outer aqueous phase can be achieved by data fitting.

外水相苯丙氨酸对映体的浓度以及分离因子α表示为：当外相对映体浓度远小于液膜相手性载体浓度时，该手性传质过程中外相边界层的扩散为控制步骤，利用数据拟合得到了外水相与液膜相界面边界层扩散的传质系数k_e。

Of the 60 patients, chronic nephritis 27 cases,acute serious nephritis 3 cases,essential hypertension 9 cases,diabetes 9 cases, multilocular cyst 6 cases,lupus nephritis 6 cases were enrolled. 60 CRF cases with four phase,including the phase of compensation of renal malfunction,the phase of no-compensation of renal insufficiency the phase of azotemia and the phase of renal failure,were divided into three groups.

CRF原发病为慢性肾炎27例、急进性肾炎3例、原发性高血压9例、糖尿病9例、多囊肾6例、狼疮肾6例，把这60例CRF患者根据中华内科杂志编委会肾脏病专业组于1992年6月在安徽太平举办的原发性肾小球疾病分型、治疗及疗效判定专题座谈会的标准分为四期第1期：肾功能不全代偿期、第2期：肾功能不全失代偿期、第3期：肾功能衰竭期、第4期：尿毒症期；本研究分为轻、中、重症（肾功能衰竭期及尿毒症期）3组来对照观察。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。