变换器

A class of fast-scale bifurcations appearing around the maximum value of the input voltage is discovered for the first time by experiment. Then the influence of the fast-scale bifurcations on the performance of the PFC converters is discussed. Whether the fast-scale bifurcations will appear and how wide the bifurcation region depend on the characteristics of the current loop output. Therefore, the main factors that affect the current loop output are analyzed, including the current loop parameters, inductance, and root-mean-square value of the input voltage.

通过实验，该文首次发现了一类在输入电压最大值附近发生的快时标分岔；详细讨论了快时标分岔对PFC变换器性能的影响；由于电流环输出的特点决定了变换器是否会出现快时标分岔以及分岔区域的大小，该文分析了影响电流环输出的主要因素，包括电流环参数、电感值和输入电压有效值。

Simulation models are good tools for the modulation and the experiment system is beneficial to the Sparse Matrix Converter's apply.

本文建立的仿真模型为稀疏矩阵变换器调制的过程提供了方便的分析和调试工具；实验系统也为稀疏矩阵变换器的实际应用打下了一定基础。

Leakage inductance and stray capacitance are two major parasitic components.

反激变换器的高频运行表明功率变压器寄生参数对变换器的性能影响很大。

Firstly, stroboscopic map of inductance current is derived.

通过建立考虑变换器输出电压纹波的电感电流频闪映射，得到了变换器稳定运行的条件。

So analyzing the phenomenon of unstable action and subharmonic of DC/DC converter from the angle of linear theory and definiteness theory can not meet the increasing requirement of control performance of DC/DC converter.

因此，仅仅从线性论和确定论角度去分析DC／DC变换器中的不稳定及次谐波现象已不能满足对DC／DC变换器控制性能日益提高的要求。

And also a method of adding an Equivalent DC Voltage Source in the output side of non-isolation converters which can extend the step-up voltage gain is proposed in this thesis.

介绍了耦合电感在不隔离型变换器中的物理意义，采用一种在输出侧增加等效电压源的方法，拓展了不隔离型变换器的升压增益。

A zero rippled input current and continuous output current Buck-Boost converter topology converter was proposed.

针对传统Buck-Boost输入输出电流断续的缺点，提出一种基于独立电感零纹波输入电流和输出电流连续的Buck-Boost变换器，详细分析了变换器的稳态工作原理。

A phase-shifted controlling PWM DC/DC full bridge converter with softswitching is proposed and used to realize a constant current power of20A(5～48V).This full bridge converter utilizes the transformer leakageinductance(or the resonant inductance in series with transformersprimary)and the autoecious capacitance of MOSFET to achieveZVS(Zero-Voltage-Switching),as a result it can decrease the switchingwaste,increase the switching frequency,and diminish the power bulk.

本文使用一种通过移相控制进行脉宽调制的软开关全桥变换器来实现20A(5～48V)恒流源，这种全桥变换器利用变压器的漏感、原边串联谐振电感和功率管的寄生电容来实现开关管的零电压开通，降低了开关损耗，提高了开关频率，减小了电源体积。

Based on the theory of small reflection, a new method for designing nonreciprocal chebyshev transformer is deduced from the design method of the traditional chebyshev transformer and this method has the same problem.

在小反射理论的基础上，从传统切比雪夫变换器的设计方法中导出了非互易传输线切比雪夫变换器的设计方法。

Though some researchers and experts proposed overmodulation control strategy to increase MC transfer ratio and made it near to 1.0, its output harmonic connects was too high to be good for application.

针对矩阵变换器电压传输比低这一问题，一些学者和专家提出了过调制的控制策略，提高了矩阵变换器的电压传输比，使其接近于1.0 ，但输出谐波含量过高，不利于应用。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。