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Thereby,it predigests the circuit and reduces the cost.through the design ,it has already been successfully applied in the interface circuit of ISA bus.

经过研制开发，已经成功应用于ISA总线的接口电路中。

Through to 'the intelligent visible doorbell systems' the topic study and the design, makes me to understand the AT89C51 monolithic integrated circuit the characteristic; Further grasped the monolithic integrated circuit to carry on many machine correspondences the principle; Also locks to the electron with the video frequency, the audio frequency control recuperates the module to have the certain degree to ford into.

通过对&智能可视门铃系统&课题的学习和设计，使我了解AT89C51单片机的特性；进一步的掌握了单片机进行多机通信的原理；也对电子锁和视频、音频的控制调理模块有一定程度的涉入。

Through to %26lsquo;the intelligent visible doorbell systems%26rsquo; the topic study and the design, makes me to understand the AT89C51 monolithic integrated circuit the characteristic; Further grasped the monolithic integrated circuit to carry on many machine correspondences the principle; Also locks to the electron with the video frequency, the audio frequency control recuperates the module to have the certain degree to ford into.

通过对%26ldquo；智能可视门铃系统%26rdquo；课题的学习和设计，使我了解AT89C51单片机的特性；进一步的掌握了单片机进行多机通信的原理；也对电子锁和视频、音频的控制调理模块有一定程度的涉入。

The invention discloses an optical-fiber all-optical code converter, comprising a temperature control circuit as well as optical-fiber Mach-Zed interferometer, heat sink, semiconductor refrigerator, thermosensitive resistor and radiator, where the interferometer is composed of two cascaded 3dB couplers on the heat sink, the relation between length difference delta L of two arms of the interferometer and generated delay time difference delta T is that delta L=c.delta T/n, where c is light velocity in vacuum and n is refractive index of optical fiber; the thermosensitive resistor is used to detect temperature of interferometer, the temperature control circuit is used to compare feedback voltage of the thermosenstive resistor with a given voltage to regulate working current of the semiconductor refrigerator, and the semiconductor refrigerator refrigerates or heat two arms of the interferometer by the heat sink.

本发明公开了一种光纤型全光码型转换器，它包括温控电路和位于密封盒内的光纤型马赫-泽德干涉仪、导热热沉、半导体制冷器、热敏电阻以及散热片；干涉仪由位于导热热沉上的二个3dB耦合器级联而成，两臂的长度差ΔL与产生的延时差ΔT之间的关系为ΔL＝c。ΔT/n，c为真空中光速，n为光纤折射率；热敏电阻用于对干涉仪的温度进行探测，温控电路用于比较热敏电阻反馈的探测电压和设定电压，对半导体制冷器的工作电流进行调节，半导体制冷器通过导热热沉对干涉仪两臂同时进行制冷或加热。

Through theoretic reckoning and simulating analyzing, several control strategies for shunt APF were compared and chose ip-iq arithmetic ofthe instantaneous reactive power theory control strategy as the right scheme to produce the instructing current. Based on it, some new control arithmetic was subjoined to suppress the resonance in system and balance the dc side capacitor voltage. Two topologies of main circuit were compared and chose the three-phase voltage-source converter with a split-capacitor as its main circuit structure. The numerical scales of the dc side capacitor and inductance of reactors were calculated. The high-pass filters were designed to eliminate effectively the highfrequency harmonics produced by APF.

通过理论计算和仿真分析，比较了并联型APF的几种控制策略的优点和缺点，从中选择瞬时无功理论控制策略i_p-i_q计算方式为指令电流产生的算法，并在此基础上增加了抑制系统谐振和平衡直流侧电容电压的控制；比较了并联型APF主电路的两种常见形式，从中选择了三相电压型变流器的主电路形式；算出适合该APF的直流侧电容和出线电感的参数；设计出能有效消除APF产生的高次谐波的高通滤波器。

The figure vies for the answering device by the subject circuit and expands the circuit to make up .

以下仅为该设计的基本说明介绍，若需要完整的设计和论文，建议您购买本设计。

This circuit is similar in operation to the circuit of Fig.

这个电路的工作情况类似于图1-10的电路。

Influence of Drive Circuit and Absorption Circuit on Failure of IGBT ...

一、驱动及吸收电路对I GB T 开关过程的影响。

Influence of Drive Circuit and Absorption Circuit on Failure of IGBT . Li Baocheng ...

是，富士、三菱等公司的驱动厚膜电路，为防止保护误动作，均。。。

In our country, 220kV substation above are used frequently in the air and sulfur hexafluoride circuit breaker circuit breaker.

在我国，220kV以上变电站使用较多的是空气断路器和六氟化硫断路器。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。