变换器

Compared with conventional half-bridge topology, a branch comprising an auxiliary switch and a capacity is added in secondary circuit.

与传统的不对称半桥变换器相比，该变换器在变压器的副边电路中增加了一条由辅助开关管与谐振电容串联组成的辅助支路。

Bilinear system model of DC-DC converters is built, combined with the control objective and extending the system, closed-loop nonlinear control system model of DC-DC converters is found.

首先建立了DC-DC变换器双线性系统数学模型，结合控制目的进行适当变形，得到DC-DC变换器的闭环非线性控制系统模型。

A 3kW prototype converter is built to verify the effectiveness of the improved converter and the best scheme for the blocking capacitor, and the experimental results are also included in this paper.

本文将改进型零电压全桥变换器应用于高压直流二次电源DC／DC变换器中，研制出一台3kW工程样机，并给出实验结果。

Comparing the synchronous rectifier to normal circuit by calculating the efficiency indicates that forestay is much better on efficiency and thermal performance. A simple circuit with good consistency, high efficiency, high reliability and low cost is presented in this paper. The feasibility is proved by emulating with computer.

通过分析已有的集中解决隔离型变换器输出带预偏置电压启动的解决方案，提出了一种全新的一致性好、成本低、效率高、简单和可靠性高的解决隔离变换器输出有预偏置电压的启动问题的电路，通过仿真验证了其可行性。

The circuit topology of the differential Forward DC-DC converter mode inverter with high frequency link was proposed. Circuit topology, transient voltage control strategy, steady principle characteristic and design criteria for the key circuit parameters were deeply investigated.

提出差动正激直流变换器型高频环节逆变器电路拓扑，并对该变换器的电路拓扑、瞬时电压控制策略、稳态原理特性、关键电路参数设计准则等进行了深入地分析研究。

Through loss mechanism investigation for a gapped inductor ,copper winding scheme and litz wire winding scheme for gapped inductor was evaluated.

对高频率和大电流的开关功率变换器，电感器损耗对温升及变换器效率指标具有重要影响。

Based on one-cycle control having such merits as anti-perturbation of source, fast dynamic response, robustness, constant frequency, but when converter works in light load its power factor becomes very poor. The modified OCC was proposed, adopting feed-forward compensation control improves influence of power factor at light load, further study adopting independence saw tooth wave completely eliminate influence of power factor at light load.

基于单周期控制有源前端变换器具有抗电源扰动能力强、动态响应快、鲁棒性强、恒频控制等优点，但在轻载时变换器的功率因数变差，提出了改进OCC策略，采用前馈补偿控制改善轻载时对功率因数的影响，进一步研究采用独立的锯齿波电路完全消除轻载时对功率因数的影响，建立改进OCCAFE变换器的数学模型。

However, PSM also has some disadvantages: large output voltage ripple and audio noise at light load.

本文主要工作包括以下几个方面内容： 1对工作于DCM模式的PSM变换器变换效率及输出电压纹波进行研究，并与相同条件下的PWM和PFM变换器模式性能进行比较。

In the process of designing the Digital Scan Converter of the B-mode ultrasound- tomography, there is a key technique that transforms the coordinate and interpolates the data. This research discusses a new algorithm used in the Digital Scan Converter called CORDIC.

在设计B 型超声诊断仪中数字扫描变换器的过程中，坐标变换和数据插补是关键的技术，本研究论述了应用在数字扫描变换器中的一种新的算法——CORDIC 算法。

The principle is stated of asynchronous and synchronous voltage-frequency converter s with VFC110 and AD652 as examples.

以VFC110和AD652为例，介绍异步和同步两种电荷平衡式电压频率变换器的工作原理、计数测频方案，进行变换误差分析，比较两种电压频率变换器的特点。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。