变换器

Topological configuration and character are provided in this paper in details,as well as simulation and experiment results.

本文详细说明了这种变换器的拓扑结构和特点，并给出了计算机仿真结果和实验结果。

Simulation and experimental results validate the proposed topology and control method.

仿真和试验结果验证了该类变换器的拓扑结构和控制方法的有效性。

The distribution proportion of the transferred power in the forward transformer and flyback transformer is varied with the turns ratio of the transformers.

改变正反激组合式双向DC-DC变换器中正激和反激变压器的匝比配置，可以改变正激变压器和反激变压器传输功率占输出功率的比例。

The operation condition of a series-resonant converter is equivalently analyzed under open-loop condition. OCC condition and selection basis of resonant parameter and switching frequency are determined. The relationships between LED number, transformer turns ratio and constant current error are also determined, which provide scientific basis for the selection of LED number and transformer turns ratio.

文中通过对串联谐振变换器开环工作状态的等效分析，确定开环恒流条件和谐振参数与开关频率的选择依据，以及LED数目、变压器变比与恒流误差之间的关系，为LED数目及变压器变比的优化选择奠定了理论基础。

A multi-resonant DC/DC converter, which is very fit for ultra-high frequency applications is analyzed.

分析了一种非常适合工作在超高频下的多谐振DC/DC变换器。

In this paper, a thermal simulation model of a LED driver was established. The thermal field and thermal stress analysis of the driver was done by using the software EFD Pro 8.2, and the temperature rise from various parts and the temperature field distribution of the PCB were obtained. By analyzing the reasons leading to overheating and unideal heat distribution, corresponding thermal simulation using an improved model was carried out. Finally, the comparison and analysis of experimental measurement results and simulation results were given.

本文基于计算流体力学中的有限体积法，建立了该变换器的热仿真模型，利用EFD Pro 8.2软件，对驱动电源内部进行了热场及热应力分析，得到了各部分的温升情况和整个电源温度场的分布情况，分析导致PCB局部过热的原因，然后针对热仿真得出的不理想的热分布情况提出了改进的方法，进行了模型改进，对PCB板上的各部分进行合理的重新布局，并再次进行了热仿真，最终得到了较为理想的结果，最后给出了实验测量结果与仿真结果的对比及分析。

Simulation and test results show that the proposed converter can reduce output voltage and implement unit power factor correction, and its dynamic performance is satisfactory.

仿真分析和实验结果均表明，该变换器的输出电压大大降低，可实现单位功率因数校正，具有良好的动态性能。

Two-stage matrix converter ; space vector modulation ; digital signal processor

双级式矩阵式变换器；空间矢量调制；数字信号处理器

With reference to this fact, two new feedforward methods are presented in this thesis.

最后，本论文对电流型控制DC/DC 变换器的混沌现象进行了分析。

The system is described mathematically on the basis of mass balance, energy balance, and phase equilibrium. The model of process simulation of the AHT system is set up. The solution system of mathematical model of absorption cycles was put forward.

对吸收式热变换器的基本原理和行为特征在系统层次上进行了分析，进而根据质量平衡、能量平衡和相平衡方程对系统进行数学表述，建立了系统的过程模拟模型，并提出了AHT吸收循环数学模型的求解机制。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐