触发电压

Overvoltages are initially clipped by breakdown clamping until the voltage rises to the breakover level, which causes the devices to crowbar into a low-voltage on state.

保护器由一个匀称电压触发型双向交流二极管组成，过电压最初被弱钳位剪除址到电压上升至超过的级别，该级别会造成装置进入一个低电压开启状态。

The function of digit trigger circuit is used to turn voltage of simulate trigger circuit to a digit, one to adjust to conduction angle and more to control the trigger pulse by controlling the digit.

数字式触发电路是将模拟式触发电路中的控制电压转变成数字量，通过对数字量的控制，达到对导通角的调节，从而控制触发脉冲。

This high voltage electrostatic precipitation controller has 7 channels of analog input,2 channels of analog output, 12 digital inputs and 16 digital outputs. The analog input includes primary current, secondary current, primary voltage, secondary voltage, etc. Controller uses MAX 187 as the A/D converter, which ensure the sampling speed and the conversion precision in the same time. The processor unit is RCM2250 module. Rabit 2000 processor, a 128K SRAM and a 256K Flash Rom are integrated in RCM2250, which improves the performance of pricipitation controller. MAX504 is used to produce the 4~20mA current output.

模拟量输入采集的信号有升压变压器一次电流、一次电压、二次电流、二次电压等，采用12位逐次比较式A/D转换器MAX187，兼顾采样速率和转换精度；中央处理单元采用以8位嵌入式处理器Rabbit2000为基础的RCM2250模块，外扩128KSRAM和256K Flash ROM，内部资源丰富，提高了控制器的整体性能；模拟量输出采用内带基准源的10位电压输出数模转换器MAX504，实现了标准4～20mA电流信号输出；控制器通过控制算法在相应开关量点上输出可控硅的触发脉冲。

Based on this circuit, a series of trigger circuits weregenerated and excellent trigger effects were achieved.

该文介绍了晶闸管投切电容器的原理和快速过零触发要求，分析了两类晶闸管的触发电路的特点和存在的问题，指出了一种新型的从主回路晶闸管获取晶闸管电压过零信号的电路框图，以该电路支撑产生一系列触发电路，取得了优秀的触发效果。

Trigger circuit by adjusting the phase of the trigger pulse to control the on-off thyristor, which can be manually controlled to adjust the output voltage, and then, after step-down transformer can be used to obtain the magnetization of the magnetic low-voltage high-current power supply, mainly by the SCR the main voltage regulator circuit, trigger circuit, such as composition, is a broad application prospect of the exchange regulator controller.

通过调节触发电路的触发脉冲的相位来控制晶闸管的通断，从而控制输出得到可人工调整的电压，再经过降压变压器得到可用于磁化的低压大电流磁化电源，它主要由可控硅调压主电路、触发电路等组成，是一种具有广阔应用前景的交流调压控制器。

Measure character: Frequency limits: CH1:dResolution of C ～ 225MHz frequency: 10 / second time-interval resolution : N/A measures speed: Can amount to 200 times measure / the second mixes in limits of the voltage on GPIB sensitivity : DC ～ 100MHz: 200MHz of ～ of 5Vac+dc 100MHz of 20mVrms ～±: 225MHz of ～ of 5Vac+dc 200MHz of 30mVrms ～±: Input of 5Vac+dc of 40mVrms ～± adjusts:(CH1 chooses) impedance, coupling: 1M Ω or 50 Ω, ac or Dc are low connect filter: 100kHz, but switch attenuation:× 1 or reference of × 10 exterior time base inputs: 1, 5, 10MHz sparks: CH1, to rising / drop the edge sparks, the percentage that uses signal n or absolutely voltage install n, setting sensitivity mixes to low, medium or tall gate start: Automatic, the hand is moved (setting gate time or resolution digit); Exterior, defer interface: Standard GP-IB(IEEE 488.1 and 488.2), take; of SCPI compatible language to say RS-232 power source only: 10 ％ of 100-120VAC ±, 50, 60 or 10 ％ of 400Hz ± 10 ％ of 220-240VAC ±, 50 or 10 ％ of 60Hz ± are suttle: 3kg dimension: 348.3mm of × of 212.6 × 88.5H

测量特征：频率规模：CH1：dc～225MHz 频率分辨率：10位/秒时候距离分辨率：N/A 测量速度：可达200次测量/秒在GPIB上电压规模和灵敏度： DC～100MHz： 20mVrms～±5Vac+dc 100MHz～200MHz：30mVrms～±5Vac+dc 200MHz～225MHz：40mVrms～±5Vac+dc 输入调节：(CH1选择)阻抗，耦合： 1MΩ或50Ω，ac或dc 低通滤波器： 100kHz，可切换衰减：×1或×10 外部时基参考输入： 1，5，10MHz 触发： CH1，对回升/回升沿触发，用信号电平的百分数或相对电压设置电平，设置灵敏度至低、中或高闸门和启动：主动，手动(设置闸门时候或分辨率位数)；外部，延迟接口：尺度GP-IB(IEEE 488.1和488.2)，带SCPI兼容说话；只讲RS-232 电源：100-120VAC±10％，50，60或400Hz±10％ 220-240VAC±10％，50或60Hz±10％净重：3kg 尺寸：212.6×88.5×348.3mm

This cycle, so that the output voltage and input trigger angle values correspond to values by adjusting the trigger angle, adjusting the output voltage.

按此循环，使输出电压与输入触发角数值对应，通过调整触发角数值，调整输出电压。

Plain scan and enhanced scan were performed in these patients with Siemens 64-slice spiral CT with the following parameters: 1.0-mm section thickness,0.6-mm collimation,pitch of 1, voltage of 120Kv and tube current of 100mAs, The scanning range is from the thoracic inlet to posterior costophrenic angle; A 80-100ml dose of nonionic iodinated contrast material is injected intravenously at approximately 4-5 ml/sec.

扫描采用Siemens 64层螺旋CT；扫描参数选择层厚1 mm，准直0.6mm，螺距1，管电压120 kV，电流100 mAs；扫描范围从胸廓上口至后肋膈角；强化时对比剂为非离子型对比剂(碘海醇，350 mg I/ml)，注射流率4～5 ml/s，对比剂总量80～100 ml；采用人工智能触发扫描技术，触发点选择肺动脉主干横断层面，阈值为100 HU，触发扫描延迟时间为6 s。

Digital simulation results show that when a step change in firing angle occurs, the first positive half-cycle time of VC will change suddenly and the subsequent electromagnetic transients appearing in the TCSC circuit will lead to overshoot and oscillations in the TCSC impedance. The range and duration of the oscillation will depend on the synchronization modes used and the manner in which the step change is introduced.

发现脉冲触发角阶跃变小时，电容电压的周期时间也突然变小，使得TCSC的导通角不会随着触发角的阶跃变化而发生突变，而是经过一个振荡过程逐渐达到稳态值，进一步揭示了电容电压同步方式下阻抗阶跃特性会出现过冲和振荡现象的原因。

However, when the switches are working as linear mode, the relations between the wide output electromagnetic pulse and biased dc voltage, trigging condition, and a function between the transforming efficiency and biased dc voltage, trigging condition need father research.

然而，当开关工作于线性模式时，开关的输出电脉冲的宽度与偏置电压和触发条件的关系、开关的转换效率与触发条件及偏置电压确切关系还需进一步研究。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。