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A low minimum operating supply voltage of 2.9V, and a low shutdown quiescent current of less than 1μA, make the LT3757 ideally suited for battery-operated systems.The LT3757 features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit.The device is available in a small 10-lead DFN (3mmx 3mm) or MSOP package.

本文介绍了LT3757主要特性，方框图以及典型应用电路，包括高效升压转换器， 3.3V输入，5V/10A输出升压转换器， 8-16V输入24V/2A输出升压转换器，高压反激电源电路，以及5.5V-36V输入，12V/2A输出SEPIC转换器和非绝缘的反相SLIC电源。

I seriously fried the small battery holder I was using for the reversing battery and melted one of my oscilloscope probes on the very hot reversing FET when fiddling with the oscillator circuit so I decided to make the output stage absolutely unable to go into forward and reverse at the same time by putting the two opto isolators back to back from one chopper amplifier to the other so only one of them can ever be on at a time - gets rid of some parts and adds a major safety improvement - bonus!

i认真油炸小电池匣，我使用为扭转电池和融化我的一个示波器探头就非常热扭转场效应管时，fiddling与振荡电路，所以我决定使输出的阶段，绝对无法进入正向和反向在同一时间，把两个光电隔离器背靠背从一菜刀放大器到其他，所以只有一个人能永远就在一个时间-摆脱部分，并增加了一个重大安全改善-奖金！

The RC loop parallel with the card formed an electric circuit on the series relay coil to excite the coil and make the contact maloperate.Therefor,it is suggested that a resistor or a capacitor be connected with the relay in parallel to lower the exciting voltage at both ends of the output relay.

经过分析研究，我们找到了有效的解决方法，消除了事故隐患。1 问题的提出DCS生产厂家提供的开关量输出卡为了保护数据输出回路，往往在输出接点两端并联一阻容回路，如图1的C1和R1。

And what we do Computer lab fire prevention burglary-resisting system to answer require but make this, computer lab fire prevention burglary-resisting system adopt the infrared sensor, Temperature sensor, gas detector have lens , spend system able to programmer simulation circuit and picture transmit and implement and control 2 4 hours to computer lab correctly with subminiature device, Find unusual situation auto alarm , play a firing prevention and guard against theft role really , can make computer system relatively safe in one, In the reliable environment, operate steadily for a long time, and lengthen service life to the best of one's ability.

而我们讨论的机房安全措施正是应此要求而做的，机房安全措施统通过红外传感器，温度传感器，气体探测器还有摄像头，利用系统可编程模拟电路ispPC20以及用CCD超小型器件对图像传输对机房实施二四小时监控，发现异常情况自动报警，真正起到安全防范的作用，能够使计算机系统在一个相对安全，可靠的环境里，长时间稳定地运转，并尽可能延长使用寿命。

matlab sps is used to build a simulink model of single-machine infinite-bus system, and based on the simulink model, simulation on effect of pss suppressing small disturbances low frequency oscillation is carried on, and some methods of improving power system transient stability are simulated, including avr and pss, short circuit cleared rapidly, fault current limiter and single-phase auto reclose. the study unifies the simulink model to realize matlab and vb seamless integration using the activex technology, and demonstrated the matlab simulation result with the vb contact surface. this method of matlab and vb integration can make up the matlab contact surface unfriendly flaw and offers a reference for the design for cai of power system analysis course.

运用matlab电力系统仿真模块集sps构建了单机—无穷大系统simulink模型，对电力系统稳定器抑制电力系统小扰动低频振荡的效果进行了仿真；对提高电力系统大扰动功角稳定性的措施，如自动电压调节器及电力系统稳定器、快速切除故障、故障限流器、自动重合闸等手段的使用效果进行了仿真验证；并结合单机—无穷大系统的simulink模型运用activex 技术实现sps与vb的无缝集成，将sps的仿真结果用vb界面显示，较好地弥补了matlab用户界面不友善的缺陷，为《电力系统分析》课程进行cai设计提供了思路。

Hot-Melt Laminating Machine is to laminate two or more different materialstogether through thermal radiation;meanwhile,apply appropriate pressure to make them become one composite.It has high adaptability and stability adn is widely used for laminating cloth leather,shoes soles and foaming sheets.lt use PE pellicle to replace glue which makes stronger effect and longer time for products stock,no discolouring,not easy to tear apart.This machine combines with the actiyator and automatic temperature circuit,which allows thick and thin laminating.accurate control of production quantity and quality,and is able to count amounts.Modern structure.stable performance,simple operation,low faulty rate and long operating life make it a fabulous machine

热熔复合机是通过热辐射对塑料、片材进行热熔贴合处理，把两种或两种以上不同材料相结合并施加一定压力使这复合成一体的加工机器，多用于服装皮革，鞋底鞋材，轻泡片材的复合加工，其优点用于PE薄膜替代胶水贴合，产品时间库存长，无变色迹象，不易撕开，贴合效果强于胶水几倍，具有广泛的适应性和稳定性，本机结合调速电机，自动温控电路，可方便准确的控制生产量和复合质量、可计数计码，是理想的复合设备，该机具有结构新颖，性能稳定，操作简单，故障率低，使用寿命长等诸多优点，我公司该产品设计有三种规格，用户可根据具体生产情况选购，如有需要可定做其它特殊规格的品种。

Requirements: Familiar with elementary test and measurement procedures of EMC; master EMC standards relating to the particular category of the company's products, and master the basic clue of a product's improvement; familiar with various certification flow of system products along with their embedded IC components; possess rich experience in the products' hardware design and deep understanding toward circuit's (master controller and interface) principles; also can make suggestions about components' (including capacitor, magnetic core, filter, inductor, instant depressors, etc) choices which would benefit to improvement of EMC characteristics of a system product. A candidate should be able to use and master structural shield mechanism with in-depth knowledge and experience. The candidate needs to be able to provide experience and vision in EMC's considerations upon various design stages of a system product.

要求：熟悉EMC的基本测试项目以及测试过程，掌握产品对应EMC的标准，把握产品的EMC整改定位思路，熟悉产品的各种认证流程，有丰富的产品硬件知识，对电路等有深度地了解；能建议使用和选择EMC设计整改元器件（电容、磁珠、滤波器、电感、瞬态抑制器件等）使用，掌握，有产品结构屏蔽设计的技能和经验，对EMC设计如何介入产品各个研发阶段流程有经验和见地。

Familiar with elementary test and measurement procedures of EMC; master EMC standards relating to the particular category of the company's products, and master the basic clue of a product's improvement; familiar with various certification flow of system products along with their embedded IC components; possess rich experience in the products' hardware design and deep understanding toward circuit's (master controller and interface) principles; also can make suggestions about components' (including capacitor, magnetic core, filter, inductor, instant depressors, etc) choices which would benefit to improvement of EMC characteristics of a system product. A candidate should be able to use and master structural shield mechanism with in-depth knowledge and experience. The candidate needs to be able to provide experience and vision in EMC's considerations upon various design stages of a system product.

熟悉EMC的基本测试项目以及测试过程，掌握产品对应EMC的标准，把握产品的EMC整改定位思路，熟悉产品的各种认证流程，有丰富的产品硬件知识，对电路等有深度地了解；能建议使用和选择EMC设计整改元器件（电容、磁珠、滤波器、电感、瞬态抑制器件等）使用，掌握，有产品结构屏蔽设计的技能和经验，对EMC设计如何介入产品各个研发阶段流程有经验和见地。

In two-chamber make-up plant, a high make-up concentration should cause no problem, because there is no risk of a short-circuit-flow.

因为没有短流溶液流的危险，所以两箱制备装置高制备浓度没有问题。

Last year we, the safety commission, made a test on a small part of the track with road bikes and gave our feedback to the circuit about the changes they needed to make before a race could go ahead.

去年我们，安全委员会，在轨道的一个小部分做了一个测试与路自行车的并且给了我们的反馈关于他们需要做的变动的电路，在种族可能继续之前。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。