开关

The aim of this research is to useDC link parallel resonance three---phase soft---switching techniqueto realize in inverter.

本研究课题的目标是三相软开关变频器DC直流环节的并联谐振，实现逆变桥上每个功率开关器件以零电压方式开通，达到软开关的目的。

Firstly, this paper analyzes and summarizes the research situation of resonant soft-switching technique and main topologies. And it indicates the main advantages and disadvantages. Then it pays more attention to analyze the parallel resonant DC link circuit theory and operating modes. It also analyzes how the resonant circuit realizes the resonant process. This paper also simplifies the control part design of the parallel resonant DC link soft-switching inverter by DSP.

本文首先对谐振软开关技术的研究现状和各种主要的拓扑结构进行了分析、综合、总结，指出了各自的优缺点；着重对并联谐振直流环电路的工作原理、电路工作模式、软开关实现机理及谐振参数的确定等进行了深入详尽的分析；利用DSP的灵活调节特点，有效地简化了并联谐振直流环软开关逆变系统的控制环节设计。

The phase switches of the proposed SRM converter turn on in zero voltage switchingmode by making use of a kind of parallel quasi resonant DC link circuit,and turn off in ZVS mode by adding a shunt-wound capacitance to every phase switch.

电路采用并联型准谐振直流环节为SRM相开关开通提供零电压条件，给相开关并联电容器则保证了相开关的零电压关断。

The voltage peak and switching loss during switching of inverter is the main cause that due to the damage of IGBT.

逆变桥电路开关过程中出现的电压尖峰和大的开关损耗是导致主开关器件IGBT损坏的主要原因之一。

It was found that in the DC bias electric field, when the relaxation time of the hot-electrons in the electron-electron and electron-phonon interaction process is longer than the carrier life, the photoconductivity oscillation can be caused by the change of mobility in the process of optoelectronic transport, which is the main cause for the output electrical pulse to show oscillations.

分析了开关体内载流子的微观状态和输运过程，在直流偏置电场作用下，开关体内的热电子在电子-电子、电子-声子相互作用过程中，当它们的弛豫时间大于载流子的寿命时，光电子的输运可通过迁移率变化引起光电导振荡，这是开关输出电脉冲出现振荡的原因。

Turn on the rotate switch,but the pilot lamp does go on.

C打开旋转开关，开关上的指示灯不亮，更换旋转开关。

It is available to improve switch frequency so as to increase power density, which requires soft switch technology.

功率密度的提高必须提高开关频率，这就要求实现开关管的软开关。

In the design of the power supply, the main circuit topology frame uses half-bridge series resonant switching and parallel load connection, in which, an IGBT is adopted as the power switches, and features high operation frequency, high output power and fast response. In addition, the IGBT in the switch mode power supply has no hard turn-on or turn –off situation in transition, thus the disturbance to the power system is avoided.

相应的激光电源采用半桥软开关技术，串联谐振并联输出，IGBT 为主控制元件，实现了高频工作、高功率多路输出，响应快速；脉冲模式工作时避免了开关管的硬开关，减小了高次谐波对电网的干扰；无需镇流电阻也可实现气体稳定放电等特性。

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主要产品：系列非晶硅、单晶硅、多晶硅太阳能电池板，太阳能智能控制器，太阳能节能灯，太阳能充电器，太阳能手机充电器，太阳能草坪灯，太阳能风扇帽，数码显示12A―全功能知识竞赛抢答器，知识竞赛抢答记分器，球赛记分器，全自动水位控制器，全自动打铃器(可工作84次/天)，KD301微电脑自动时控、打铃器，KD302微电脑光控、时控开关，KD303微电脑交直流两用广播、打铃器，KD304微电脑交直两用打铃器，KD--18多路呼叫器，高效电子捕鱼器，捕器，红外线报警器，系列逆变电源，校园智能广播控制器，激光教鞭，程控电话交换机，系列制冷组件，系列电磁阀，系列直流灯，系列发电手灯，系列光电开关，系列水银开关，系列湿簧管、干式舌簧管，系列半导体气敏头，系列磁芯、磁环、磁罐，超声波发射接收头，系列傻瓜王功放，系列逆变模块，推动模块2436等等。

Ecsis German original pressure differential table, electric contact pressure gauges, diaphragm pressure gauge, stainless steel pressure gauge, ultra-high pressure manometer; pressure transmitter, temperature transmitter; pressure sensors, force sensor, weighing sensor, temperature sensor; dual metal thermometer, FarEasTone thermometer, thermal resistance, thermocouple thermometer; fretting pressure switches, pressure switches magnetron, mechanical, electronic pressure switches, etc..

ECSIS德国原装压差表、电接点压力表、膜片压力表、不锈钢压力表、超高压压力表；压力变送器、温度变送器；压力传感器、力传感器、称重传感器、温度传感器；双金属温度计、远传温度计、热电阻、热电偶温度计；微动压力开关、磁控压力开关、机械式、电子式压力开关等。

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。