查询词典 converter

Based on these, the single phase converter system is studied in detail, including the selection of the main circuit scheme, the formation of Sine-wave Pulse- width Modulation signal, the design of the drive and protection circuit of IGBT, and the design of high frequency transformer. Finally, the simulation software is employed to test the effect. And the result is satisfactory.

在此基础上，本文主要对电能质量控制稳定器所需的DC/AC控制电源进行了详细研究，包括主电路方案的选择、SPWM波的生成、IGBT的驱动和保护电路、高频变压器的设计以及闭环电压控制原理，最后进行了输出电压的计算机仿真分析，结果是令人满意的。

Based on the analysis of traditional converters, a novel circuit is proposed, what it defers from traditional two switches/phase converter is that it has not dump resistance, and that the rise time and falling time of the phase currents can be effectively reduced, and the torque and output power performance of the system is improved .

该文的研究目的在于设计开关磁阻电机并通过对控制理论在SRD系统中的应用进行深入的分析、发展和创新，在保证SR电机的固有优点前提下，改善或消除其存在的缺点，提高系统的性能，逐步开始出相应的产品，进而推广SR电机的应用。

The topology structure is modified on the basis of basic principle of phase shift fullbridge ZVZCS PWM converter.

在移相全桥ZVZCS PWM变换器基本原理的基础上，对其拓扑结构进行了改进，实现了一种带双变压器结构的零电压零电流移相全桥PWM控制变换器。

Based for the purpose, this paper develops a simple way named analogue circuit to realize SPWM control. This new way is proved in the design of three- phase small power converter and get good effect.

基于此目的，本文提出用简单的模拟电路实现逆变器正弦脉宽调制的方案，并用此方法实现了小功率三相变频电压源的设计，得到较好的效果。

This thesis firstly discusses some research focus of high-frequency power supply and variable circuit topologies are compared here. Then it emphasizes the operating principle of phase shift full bridge converter and realization of soft switching techniques.

首先简单讨论了目前高频开关电源的研究热点，对各种变换电路拓扑结构形式进行了分析比较，然后重点分析了移相全桥变换器的工作原理和软开关技术的实现。

Based on the analysis of traditional converters, a novel circuit is proposed, what it defers from traditional two switches/phase converter is that it has not dump resistance, and that the rise time and falling time of the phase currents can be effectively reduced, and the torque and output power performance of the system is improved.

在分析了常用的功率变换电路基础上，提出了一种基于双开关功率变换电路的改进电路，该电路与常规双开关功率变换电路的区别在于不需要能耗制动电路，能够利用关断相绕组中储存的能量有效缩短相电流的建立和关断时间，改善SR电机高速运行时输出转矩下降和转矩脉动严重的问题，并且电机的输出功率也得到提高。

The digital part includes rectangular-to-polar converter and digital phase modulator.

数位部份包括直角座标至极座标转换器及数位相位调变器。

In the case of short - circuit,the output current amplitude and phase of PWM converter are controlled to adjust the equivalent impedance of current - limiter for fault current suppression.

故障发生后，通过变流器控制变压器二次侧注入电流的相位和幅值，进而调节限流器的等效阻抗，从而实现抑制短路电流的目的。

On the structure of system, the three-level converter of three phase bridge of the equipment in main circuit is built with IPM module based on IGBT, and its controller is made up of double CPU.

在系统结构的实现上，该装置的主电路采用基于IGBT的智能模块IPM构成三相桥三电平变流器；控制器采用双CPU结构，以DSP(TMSF2 4 0 )作为主控制器，其任务是采样、计算和实时控制；以 80C196作为辅助控制器，专门处理外挂键盘输入、数据显示查询及与上位机通信。

This board uses two chips, six channels A/D converter and phase locking synchronous technology for collecting three-phase voltage and current signals in timing and equal-time cycle sampling ways, and the gained data make more reasonable for power quality norm analysis.

并采用了两片六通道高速A/D转换器和运用了锁相同步技术，对三相电压和电流信号能进行定时采样和等间隔采样，这样得到的数据对于下一步电能质量指标进行分析更为合理。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48