And SN74121 One Shots SN54221 and SN74221 Demonstrate Electrical and Switching Characteristics That Are Virtually Identical to the SN54121 and SN74121 One Shots Pinout Is Identical to the SN54123, SN74123, SN54LS123, and SN74LS123 Overriding Clear Terminates Output Pulse
一射门和SN74121 SN54221 SN74221示范和机电开关特性，几乎是相同的SN54121和SN74121一个射门针脚是相同的SN54123，SN74123，SN54LS123，清除覆盖和SN74LS123终止输出脉冲
Pumping with a high power LD and with a Q switching technology, laser pulse with the characteristics of high repetition rate, high peak power and shot pulse width, will be obtained.
用较大功率LD作为泵浦源并利用调Q技术，可以获得高峰值功率高光束质量的激光输出，这在激光测量、激光雷达、激光遥感等领域有着非常广阔的应用前景。
By discussing this phenomenon, we find the affecting pattern of the oscillating light on output pulse, and learn the influence of pump light on the Q-switching result further. The conclusion of this paper can be used in the optimal design of the acoustics-optical Q-switched multi-direction side-pumped DPL.
通过对该现象的分析，明确了振荡光对输出激光脉冲性能的影响规律，从而进一步分析DPL中泵浦光对调Q效果的影响，据此可以对声光调Q三向侧面泵浦DPL进行优化设计。
A new control technique for switching DC/DC converter, Multilevel-Pulse Adjustment, is proposed in this paper.
提出了一种新型的开关DC/DC变换器控制方法——多级脉冲调节控制方法。
It is characterized by: the mechanical mouse moves and rolling around key operations into switching signals Circuit square with the square wave signal to substitute for the original mouse photosensitive sensors within the pulse signal, using the switch can be achieved mouse cursor movement and the mouse double-click a single operation, and the use of transmitting and receiving circuits instead of the mouse line, a remote-control mouse.
其特征是：将机械鼠标的滚动动作和左右键的作转换成开关信号，用方波电路产生的方波信号代替原鼠标内光敏传感器的脉冲信号，用相应的开关动作可以实现鼠标光标移动和鼠标的单双击作，而用发射和接收电路代替原来的鼠标线，可以实现鼠标的遥控。
A maximum green power of 85 W was generated at 20.4 kHz repetition rate and 230 ns pulse width when pumped current of laser diodes was 17.3 A with compensating phase mismatch by angle departuring and strong cooling big KTP crystal, leading to ±1.03% instability and 9.7% of optical-optical conversion efficiency.
标 签 激光技术全固态绿光激光器角度偏离补偿相位失配法双声光Q开关 KTP倍频晶体 laser technique all-solid-state green laser compensating phase mismatch by angle departuring double acousto-optic Q-switching KTP frequency-doubled crystal
The switching contrast and extinction ratio are studied in the sixth chapter. A theoretical model of channel crosstalk is established and the influences of the frame period, the time delay between the signal and control pulses, the control pulse energy and width, the small signal gain, the loop's time asymmetry and the splitting ratio of the main coupler on it are investigated thoroughly for the first time.
第六章研究了TOAD解复用信号的开关比与消光比，首次建立了TOAD信道串扰的理论模型，详细研究了帧周期、信号光相对于控制光时延、控制脉冲能量、宽度、小信号增益、环时间非对称性及主耦合器分光比等对信道串扰的影响，并与实验结果进行了定性比较，结果两者吻合很好。
Based on the output voltage error at the beginning of each switching cycle, MPA controller selects one control pulse among multilevel pulses as the control signal of converter at this switching cycle.
MPA控制器在每个开关周期起始时刻根据变换器的输出电压误差，在强弱等级不同的多级脉冲中选取一个作为该周期的有效控制信号。
The traditional correspondence switching power supply input is the diode rectification and the filter capacity combination circuit, the input current wave presents pulse shape, and leads to the power factor on ac line side is very low.
传统的通信开关电源输入端是二极管整流与滤波电容组合电路，其输入电流波形呈脉冲状，导致交流网侧功率因数很低。
This paper presents a manipulator by three PLC output pulse, driving horizontal, the vertical axis transducer, control manipulator axis horizontal and vertical positioning precision, micro-switches position signal transmission will host PLC; location close to the switching signal from the feedback from the mainframe to the PLC, through the exchange of Motor reversion to control the manipulator gripper Zhang, thus achieving accurate manipulator movement functions.
本文介绍的机械手是由PLC输出三路脉冲，分别驱动横轴、竖轴变频器，控制机械手横轴和竖轴的精确定位，微动开关将位置信号传给 PLC主机；位置信号由接近开关反馈给PLC主机，通过交流电机的正反转来控制机械手手爪的张合，从而实现机械手精确运动的功能。
Triggered vacuum switch is one of the important switching devices in relation to high-power pulse technique. It has a broad prospect in the field of medium voltage, due to its compact structure, rapid dielectric recovery, no-noise operation, high reliability in triggering, high current carrying and charge transferring capability, etc.
真空触发开关TVS是高功率脉冲技术领域的重要开关器件之一，它具有结构紧凑、介质恢复迅速、操作无噪声、工作可靠性高、环境适应性强等优点，在中压领域具有广泛的应用前景。
By using MPT control, according to different operation states, multilevel pulses are combined to generate a multilevel pulse train for the control of switching converters.
MPT控制器可根据开关变换器的工作状态，将多个强弱等级不同的控制脉冲组成脉冲序列对变换器进行控制。
Switching to the high, middle or low frequencies, you can filter the harsh acoustic stimulus, while the shut off mode completely restrict outer noise or sound wherein you may hear/sense the sound of your pulse and breathing only.
通过选择高、中、低频率，它能过滤外界声场的强烈刺激。你甚至可能完全关闭所有的外界噪音，只听到自己的心跳和呼吸声。
The converter has such advantages as zero-voltage zero-current switching in main switch, zero-current turn-on and zero-voltage zero-current turn-off in auxiliary switch, zero-current zero-voltage turn-off and zero-voltage turnon in freewheeling diode at the same time. In addition, the proposed ZVZCT soft-switching cell is not only suitable for Buck converter with minority-career device, but with majoritycarrier device, both in pulse width modulationcontrol.
该变流器实现了主开关管的零电压零电流开关，辅助开关管的零电流开通、零电压零电流关断，以及续流二极管的零电压零电流关断、零电压开通；不但适合于少子器件，而且适合于多子器件，同时保持PWM控制的特点。
Every sub-circuit is designed reasonably according to the principle and character of PWM switching converter, such as: bandgap, error amplifier, oscillator, narrow pulse generator, saw tooth generator, PWM comparator, PWM modulator, output stage, OCP circuit and low voltage comparator.
根据PWM开关电源的原理和特点，合理地设计了各个子电路，其中包括：带隙基准源、误差放大器、振荡器、窄波发生器、锯齿波发生器、PWM比较器、PWM脉冲调整器、输出级电路、过流保护电路和低压比较器等。
The reverse pumping current switching-off is performed by SOS in about 4.3 ns, which results in the formation of an output voltage pulse across output load.
实验装置在电阻负载上得到了脉冲输出功率约为8.6 MW，脉冲宽度约10 ns，重复频率10 kHz的高压脉冲输出。
Circuit must be designed so that overvoltage is not applied the LED during on/off switching. Transient or pulse current will damagr the junction of LED die.
在使用发光二极管体器件时，必须先设计电路的电压和电流，以免LED过载，短暂的过载就可能导致LED发光部分损坏而不能发光。
Two kinds of self-pulsation are observed in the fiber laser with a low Q cavity, one is the pulse generated from passive Q-switching of saturable absorption; the other is the giant pulse due to stimulated Raman scattering in the fiber.
发现低Q值腔光纤激光器具有两种形式的自脉动输出，一种是饱和吸收被动调Q 产生的自脉冲，另一种是与光纤中的受激Raman散射效应相对应的阵发性巨脉冲。
Furthermore, the main power circuit of the DC-Pulse Power Controller is two full-bridge converters using IGBT switching components. Six switching conditions are implemented at each full-bridge converter to generate six output voltage modes. In addition, the output frequency of pulse can be increased to 50 kHz by alternatively switching of the two full-bridge converters. Finally, Visual Basic in pc and 8051 microprocessor have been developed as two alternatives for the man/machine interface of the DC-Pulse Power Controller.
直流脉冲电源控制器，主要电路架构为二组由IGBT元件所构成之全桥式转换电路，其中藉由每一组电路之六种切换条件以产生六种电压模式输出，且利用此二组电路交替地切换以提高输出脉波频率，最高频率可达50KHz，并可利用个人电脑上Visual Basic人机介面软体或以8051微处理器为基础之人机介面，对直流脉冲电源控制器进行控制。
Hardware design of switching mode charger is designed systematically including power circuit, control circuit, and human-machine interface circuit and serial communication circuit. The power circuit basically consists of rectifier circuit, high-frequency transformer and the output filter reactor. The control circuits are built up by PWM pulse-generating circuit, IGBT driver circuit, I~2C bus circuit, and so on. Taking some factors like cost, EMC and efficiency into account, some relevant schematics and PCBs are drawn.
包括功率电路、控制电路以及人机界面与串行通讯电路在内的系统设计，功率电路主要包括整流电路、高频变压器、输出滤波电抗器等，控制电路主要包括PWM发生电路、IGBT驱动电路、I~2C总线电路等，在考虑成本、EMC、效率等因素后完成了相关的原理图绘制和PCB绘制等工作；开关充电机的软件设计。