开关

Founded in 2003, the company's main products are: central air-conditioning temperature control, heating room temperature, three-speed switch, fan-coil electric valves, electrical control valve, electric butterfly valve, temperature sensors, pressure controllers, Pressure switches, pressure transmitter, flow switches, antifreeze switch, air valve actuator, the ratio integral temperature control, etc.

公司成立于2003年，公司主营产品有：中央空调温控器、采暖房间温控器、三速开关、风机盘管电动阀、电动调节阀、电动蝶阀、温度传感器、压差控制器、压差开关、压力变送器、水流开关、防冻开关、风阀执行器、比例积分温控器等。

T present, Gaupu Corporation's main products include: thermostat for central air conditioning, thermostat for heat supply and heating, motorized valve for three-speed switch fan coil, electric control valve, electric butterfly valve, temperature sensor, humidity sensor, differential pressure controller, differential pressure switch, pressure transmitter, water flow switch, antifreezing switch, air valve performer, direct digital controller and integration software etc.

北京高标自控设备有限公司目前公司主要产品有：中央空调温控器、供热采暖温控器、三速开关风机盘管电动阀、电动调节阀、电动蝶阀、温度传感器、湿度传感器、压差控制器、压差开关、压力变送器、水流开关、防冻开关、风阀执行器、DDC直接数字控制器、上位集成软件等。

This thesis integrates CMOS processes with post-process techniques of MEMS to design and fabricate a Transmit/Receive switch and a two-way on-off switch. These switches, actuated by an electrostatic force driven, are a contact type. These switches consist of a CPW transmission line, which is based on the metal layers by CMOS process.

中文摘要本研究采用CMOS标准制程配合微机电后制程制作传送-接收开关，且设计出具有双向切换功能之开关，而是以接触的方式进行运作，是一种以静电力为驱动的开关，开关的结构包含了共平面波导的传输线，共平面波导是利用CMOS制程里的金属层制作。

Said invented method for and device adopt MCU or logic or logic chip detecting said ringing current signal, backboard ringing current signal and mutual sent signal, and sequential control sequential control, avoiding switch device hard switching and arcking, raising switch device and backboard reliability.

本发明方法及装置通过采用MCU或逻辑芯片检测本板铃流信号，背板铃流信号和互送信号，并采用时序控制，避免了在铃流开机和切换时的开关器件硬切换，以及铃流的在开关电路切换时的拉弧，提高了开关器件的可靠性；而且把开关电路从通讯设备插框背板转移到单板上来，提高了背板的可靠性，降低了后续的维护和检修困难。

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。

But in practical operating, overvoltage caused by reignition of the vacuum switching device frequently appears, and it result in damage of the capacitor bank or the switchgear itself. Ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon. In this paper, a study on overvoltage caused by reignition due to capacitor bank switching with the vacuum switching device and its preventive measures are carried out. The main work which has been done and researches are as follows: 1. The producing mechanism of overvoltage and its influence factor are analyzed. It is pointed out that single-phase reignition is the main reason for damage of the switchgear and two-phase reignition is the main reason for damage of the capacitor bank,so overvoltage of single-phase reignition and two-phase reignition are the emphases of prevention. 2. Analysis of the special working condition of the operating switch for capacitor bank is carried out. It indicates that the vacuum switching device is difficult to realize no-reignition under this operation condition, so it is more practical to adopt protection devices. 3. Analyses of protection effect of RC and MOA and their shortages are carried out. It shows that the two methods can only restrain effectively overvoltage caused by single-phase reignition, and they cannot protect the capacitor bank when reignition of two-phase occurs. 4. The operation principle of G-R damping device is analyzed and discussed emphatically.

本文针对真空开关投切电容器组时因重燃而产生的过电压及其防治措施进行了研究，所开展的主要工作和研究结果如下： 1、对过电压的产生机理及其影响因素进行了分析，指出单相重燃是导致开关设备损坏的主要原因，而两相重燃则是导致电容器组损坏的主要原因，因此单相重燃和两相重燃过电压是防护的重点； 2、对电容器组操作开关的特殊运行条件进行了分析，指出在这种运行条件真空开关难于实现不重燃，因此采用保护装置更具有现实意义； 3、对RC与MOA的保护效果和存在的不足进行了分析，指出这两种方法均只能有效抑制单相重燃过电压，而不能在发生两相重燃时保护电容器组； 4、重点对G-R阻尼装置的工作原理进行了分析和讨论，指出该装置接入后线路中将会出现两种频率的高频振荡，而电容器组上的过电压是由这两种振荡共同决定的； 5、根据对上述两种振荡的分析指出存在一个最佳电阻值使得过电压最低，并提出了电容器组电压和最佳电阻值的近似求解方法； 6、使用电气暂态分析软件MATLAB对G-R装置的保护效果进行了仿真计算，证实该装置确实可以有效抑制重燃时的电容器组过电压； 7、根据仿真与近似计算结果的偏差提出了近似计算的修正方法，经过修正后的过电压计算结果与仿真结果吻合较好； 8、对G-R装置中放电装置G与阻尼电阻R的要求进行了分析，指出采用编织电阻和真空间隙可能是最佳选择。

The principles of RVC and the basic functions of reclosers, sectionalizing switches and looped switches are discussed...

结合实例详细描述了这种方案的重合器、分段开关和联络开关的基本功能及系统的工作原理，深入论述了环状网以及网格状配电网的分段开关和联络开关的整定方法

The fluid moving device may also be provided with a self-sealing power switch for activating and deactivating the fluid moving device, wherein the self-sealing power switch includes self-sealing structure that seals the intake port when the power switch is in a deactivated position, and that unseals the intake port when the self-sealing power switch is not in the deactivated position.

这种流体移动装置还可以配备自动密封的电源开关以便起动和关闭该流体移动装置，其中自动密封的电源开关包括在电源开关处于关闭位置时密封流体入口而在自动密封的电源开关不处于关闭位置时不密封流体入口的自动密封结构。

Summarize: XGN15-12 is a new metal-enclosed switchgear which whole air-insulated is assembly composed with SF6 loading switch as the main switch ,suitable for auto-electric-power distribution , both compacted and extensible metal-enclosed switch equipments.

XGN15-12型户内交流高压六氟化硫环网开关设备是新一代以六氟化硫负荷开关作为主开关而整柜采用空气绝缘的，适用于配电自动化的、既紧凑又可扩充的金属封闭开关设备。

The charge control method is: input the battery module and the rectifier transformer to one of the first and second plug base; and using the first voltage detector and the second voltage detector to judge the input voltage of the first and second plug base, so to relatively control the conducting state of the first switch, the second switch, the third switch and the fourth switch, and so to make the rectifier transformer charge the battery module through the control of charge current in the charger.

该充电控制方法，是将电池模块及整流变压器分别输入第一及第二插座其中之一；并由第一及第二电压侦测器判断第一插座及第二插座的输入电压，以相对控制第一开关、第二开关、第三开关及第四开关的导通状态，使整流变压器可经由充电器的充电电流控制对电池模块进行充电。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。