和电路

The invention relates to an air ion static determination and an air ion static determinator, comprising air ionization collector, electric charge weigh, control circuit, computer and software system supporting measurement and data recording processing, wherein the electric charge weigh is used to isolate the air ionization collector and the computer acquisition circuit, the computer can monitor the electric quantity on the collector plate electrode.

本发明涉及一种空气离子静态测定法及空气离子静态测定仪，计算机控制的可以在线连续监测空气离子浓度的电路设计和测量方法。测试系统由空气离子采集器、电荷秤、控制电路、计算机及其支持测量和数据记录处理的软件系统构成。电荷秤通过电―光转换、光―电转换起到了把空气离子采集器与计算机采集电路隔离的作用，使采集器上的电荷不会通过采集电路放电，计算机可以监测采集器极板上的带电量。

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

Thereinto,the measuring circuit is composed of heating circuit, voltage follower circuit, warning circuit, gas sensor failure indication circuit and power supply indication circuit;The microprocessor adopts 8051 Single - Chip computer;The LED adopts Seven LED figures display;The keyboard adopts separate type non-coding keyboard.

其中测量电路由加热电路、电压输出电路、报警电路、气敏元件损坏指示电路和电源指示电路组成；微处理器采用8051单片机；LED显示采用七段LED数码显示器；键盘采用的是独立式非编码键盘。

As for the computer engineering design chain, the human-computer dialogue has been with the console layer design, hardware and software interlock circuit design, the implementation of circuit design, other design is what we need to complete the work For example, if the interface circuit, inter-market linkages as well as the code of the circuit, such as the outdoor part of the design of hardware circuits and wiring.

而对于计算机联锁工程设计来说，人机对话层已经含控制台设计、联锁电路软硬件的设计、执行电路的设计，其它的设计才是我们需要完成的工作，例如如接口电路、场间联系、电码化电路以及室外部分等硬件电路和配线设计。

aining at high impedance weak signal measurement,the relations among measuring precision,input impedance and input bias current,the guard technology is applied to design a measuring circuit with guard circuit,adding a guard potential to low-impedance nodes of circuit,the effect of leakage current is reduced.using spice simulation and validates that guard circuit can increase the input impedance of the system and lower the input bias current,the results show that the guard circuit provids a valuable solution for high accuracy measurement of the high impedance weak signal.

摘 要：针对高阻抗微弱信号测量问题，对测量精度与系统输入阻抗、输入偏置电流的关系进行分析，应用保护技术设计了带保护电路的测量电路，将电路中的低阻抗节点加上保护电势，减小漏电流的影响。通过pspice仿真分析，验证保护电路能提高测量系统的输入阻抗和降低输入偏置电流，结果表明保护电路技术能实现对高阻抗微弱信号的高精度测量。

The finished work is as follows: The interface circuits of the AC voltage acquisition and rotation speed, the keyboard, and communication are designed based on MSP430F149. On account of the different EM environments on the spot where the diverse terminals are located, some anti-interfering measures in the terminals hardware design are considered.

具体完成的工作如下：设计了基于MSP430F149的作为下位机的终端控制器，以及交流电压和转速采集接口电路、键盘接口电路、通信接口电路和输出开关量接口电路。

Should catch the characteristic of rat tool to be the high pressure that it includes a box of body and installs in the box the body creation electric circuit and report to the police electric circuit and limit to flow a lamp bulb, and arrange in the high pressure of catch the rat place to output a linear electronics to catch a rat machine, high pressure creation electric circuit is press to commutate electric circuit, and in its exportation carry a conjunction have already provided to report to the police the establish of electric voltage of the electric circuit power supply to copular commutate a diode set.

该捕鼠器的特征是它包括盒体和安装在盒体内的高压产生电路、报警电路、限流灯泡，以及布置在捕鼠场地的高压输出线的电子捕鼠器，高压产生电路是五倍倍压整流电路，且在其输出端连接有提供报警电路电源电压的串联连接的整流二极管组。

A method for decreasing energy consumption includes obtaining relevant configuration parameter from system master control unit by user circuit management unit when device is started up and dynamically controlling operation mode of user circuit by user circuit management unit according to relevant configuration parameter as per preset configuration requirement when cyclic-scanning of user circuit is executed.

本发明提供了一种通过动态控制用户电路的工作模式来降低能耗的方法和系统，其中，该方法可以包括以下步骤：步骤一、当设备启动或相关配置参数发生更改时，用户电路管理单元从系统主控单元获取相关配置参数；以及步骤二、当执行用户电路的周期扫描时，用户电路管理单元按照预定配置要求，根据相关配置参数来动态控制用户电路的工作模式。

The ADC is pipelined, including a single-input/difference-output sample/hold circuit and nine stage subcircuits. The preceding eight stages are 1.5bits/stage, and the last stage consists of two comparators. Every input sample is converted into 18 bits binary signals, and these binary signals are converted into 10 bits binary signals through digital correction circuit.

模数转换电路采用流水线式的结构，包括具有单端输入/差动输出功能的采样保持电路和九级的子电路，前八级子电路使用1.5位/级的结构，最后一级使用两个比较器实现，每个输入值被转换为18位的二进制代码，通过数字纠正技术最终实现10位的输出，按照前端电路的应用要求，这个模数转换器实现1.33MHz的采样速率。

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

摘要］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。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。