Silicon control rectifier (scr)
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The silicon-controlled rectifier (SCR) is a power semiconductor device that was introduced in 1956. It can convert AC to DC and control the amount of power delivered to a load. The SCR has a p-n-p-n structure with three terminals: anode, cathode, and gate. It can switch between conducting and non-conducting states. SCRs are used for applications like rectification, regulated power supplies, motor speed controls, and battery chargers.
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SCR
The document discusses the silicon controlled rectifier (SCR), a three-terminal semiconductor device that acts as a controlled switch. It can rectify AC to DC and control the amount of power delivered to a load. The SCR combines the functions of a rectifier and transistor. Key points include:
1) An SCR has two states - it either does not conduct or conducts heavily, behaving like a switch.
2) It is turned on by applying a small positive voltage to the gate, as the breakover voltage is usually much higher than the supply voltage.
3) To turn it off, the supply voltage must be reduced to zero to stop conduction.
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This document provides an overview of SCR (silicon controlled rectifier) characteristics and operating principles. It discusses:
1. SCR structure and characteristics, including static and transient two-transistor models.
2. Methods for turning SCRs on, including gate triggering, dv/dt triggering, and light triggering. Turn-on characteristics like delay time and rise time are examined.
3. Methods for turning SCRs off, including natural/line commutation in AC circuits and forced commutation techniques for DC circuits like load side commutation methods.
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An SCR (Silicon Controlled Rectifier) is a solid state semiconductor device that controls current flow through its four layers. It functions like a conventional rectifier but is controlled by a gate signal. When the gate receives a threshold voltage, the SCR turns on and conducts current in a forward conducting mode. SCRs are commonly used to produce DC voltages for motors by rectifying AC line voltage through half-wave or full-wave rectification.
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The document discusses the silicon controlled rectifier (SCR), a three-terminal semiconductor device that acts as a controlled switch. It can rectify AC to DC and control the amount of power delivered to a load. The SCR combines the functions of a rectifier and transistor. Key points include:
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An SCR (Silicon Controlled Rectifier) is a solid state semiconductor device that controls current flow through its four layers. It functions like a conventional rectifier but is controlled by a gate signal. When the gate receives a threshold voltage, the SCR turns on and conducts current in a forward conducting mode. SCRs are commonly used to produce DC voltages for motors by rectifying AC line voltage through half-wave or full-wave rectification.
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Part of Lecture series on EE321N, Power Electronics-I delivered by me during Fifth Semester of B.Tech. Electrical Engg., 2012
Z H College of Engg. & Technology, Aligarh Muslim University, Aligarh
Please comment and feel free to ask anything related. Thanks!
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The document discusses thyristor devices, specifically the silicon controlled rectifier (SCR). It provides details on the basic structure and operation of SCRs, including:
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The document discusses thyristors, which are semiconductor devices that can be used as electrically controlled switches. It provides details on:
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- The three main modes of operation for thyristors - reverse blocking, forward blocking, and forward conducting.
- Applications of thyristors onboard ships, including use in motor starters, variable frequency drives, converter circuits, and inverter circuits.
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Thyristors are four-layer pnpn power semiconductor devices that switch between conducting and nonconducting states in response to a control signal. They are used in timing circuits, AC motor speed control and switching circuits. Thyristors have lower on-state conduction losses and higher power handling capability compared to transistors, but worse switching performances. Common thyristor devices include SCRs, SCSs, triacs, diacs, PUTs, and GTOs. Thyristors can be turned on through forward voltage triggering, gate triggering, dv/dt triggering, temperature triggering, or light triggering, with gate triggering being the most common method.
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This document discusses the series and parallel operation of thyristors. It explains that in series operation, voltage sharing networks like resistors are required to evenly distribute the voltage across each thyristor. Uneven current sharing can also occur in parallel operation due to differences in thyristor characteristics, which can cause thermal runaway. Common heat sinks and magnetic inductors are used to force equal current sharing and prevent damage. The document also provides examples of thyristor applications in phase control circuits and UPS systems.
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Thyristors are solid-state semiconductor devices composed of alternating layers of N-type and P-type materials. They act as electrically controlled switches that can be turned on by a current pulse to the gate terminal, causing the thyristor to conduct current as long as it remains forward biased. Thyristors are used in applications involving high currents and voltages, often for controlling alternating current where they automatically switch off when the current polarity changes. Common applications include lighting dimmers, motor speed controls, and high-voltage direct current electricity transmission.
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The document discusses thyristors, which are semiconductor devices that can be used as electrically controlled switches. It provides details on:
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This document provides an overview of power electronics devices including power diodes, transistors, MOSFETs, IGBTs, thyristors, and triacs. It discusses the basic structures and characteristics of these devices. It also covers topics such as thyristor triggering methods, gate control, commutation, and applications. The document is intended as an introductory guide to understanding various power semiconductor devices used in power electronics applications.
Devices part 2
This document discusses power semiconductor devices and related topics over multiple pages. It covers SCR firing circuits, commutation circuits, heat sinks, snubber circuits, fuse selection, and the series and parallel operation of SCRs. It also discusses switching losses that occur in semiconductor devices when they are turned on and off. Key points covered include how SCRs are fired, the purpose of commutation and snubber circuits, heat dissipation methods, fuse types and ratings, and factors that influence power losses in semiconductor switches.
Power Electronics- Power Semiconductor devices.pptx
Introduction to power electronics, Working and Characteristics of the main power semiconductor devices used in power electronic applications
L2 thyristors
Part of Lecture series on EE321N, Power Electronics-I delivered by me during Fifth Semester of B.Tech. Electrical Engg., 2012
Z H College of Engg. & Technology, Aligarh Muslim University, Aligarh
Please comment and feel free to ask anything related. Thanks!
Ppt on power electronics
The document provides an overview of power electronics components and their evolution over time. It begins with early rectifier technologies like mercury-arc and thyratron tubes. It then discusses the transition to modern solid-state components like transistors, thyristors, and power transistors. Key power electronics devices like power diodes, MOSFETs, IGBTs, and thyristors are explained. DC-DC converters and their operating modes are also summarized.
Power electronics and applications of semiconductors devices, peripheral effects
Basics of power electronics in mechatronics engineering
Presentation1
Power electronic devices like SCRs, TRIACs, and IGBTs are discussed. SCRs can convert and control large amounts of power using little control power. SCRs are four-layer semiconductor devices that conduct current in one direction when turned on by a gate signal, and block current in the reverse direction. TRIACs are bidirectional thyristors that can conduct current in both directions, making them suitable for controlling AC power. These semiconductor switches are used in applications like power supplies, motor controls, and surge protection.
SCR unit II.pptx
The document discusses the symbol, construction, working modes, and applications of SCR (silicon controlled rectifier). It provides details on the following:
- SCR has 3 terminals - anode, cathode, and gate. It conducts current in one direction like a diode but requires a gate pulse for triggering.
- Internally, it has 4 layers that form 3 PN junctions. It can operate in forward blocking, forward conduction, and reverse blocking modes depending on terminal polarity and gate pulse.
- Common applications include motor speed control where SCRs control current to the motor armature. Proper mounting using leads, bolts or studs with insulation is required to dissipate heat generated
Silicon controlled rectifier
SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded. Their operation makes them suitable for use in medium- to high-voltage AC power control applications, such as lamp dimming, power regulators and motor control.
Scr (07 Ece 109)
It is a college presentation on Semiconductor controlled rectifiers commonly known as SCR or Thyristor.
Power Electronics
Power electronics involves controlling the flow of electrical energy through electronic circuits. Rectifiers and inverters are common examples. Power electronics emphasizes large semiconductor devices, magnetic energy storage, and control methods for nonlinear systems. It plays a central role in energy systems and alternative resources. Power electronic systems efficiently convert electrical energy from one form to another. Power electronics courses cover high voltage switching devices, rectifiers, DC-DC converters, and inverters. Thyristors like SCRs are semiconductor devices that act as open or closed switches for control applications. SCRs are used for power control, backup lighting, and over-voltage protection.
Similar to Silicon control rectifier (scr) (20)
Power Electronics- Power Semiconductor devices.pptx
Power Electronics- Power Semiconductor devices.pptx
Power electronics and applications of semiconductors devices, peripheral effects
Power electronics and applications of semiconductors devices, peripheral effects
Lecture 2.2_Power electronic devices_Thyristors_2.pdf
Lecture 2.2_Power electronic devices_Thyristors_2.pdf
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IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
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一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
原版一模一样【微信：741003700 】【(osu毕业证书)美国俄勒冈州立大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】外观非常简单，由纸质材料制成，上面印有校徽、校名、毕业生姓名、专业等信息。
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
校徽：象征着学校的荣誉和传承。
校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
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Computational Engineering IITH Presentation
This Presentation will give you a brief idea about what Computational Engineering at IIT Hyderabad has to offer.
Supermarket Management System Project Report.pdf
Supermarket management is a stand-alone J2EE using Eclipse Juno program.
This project contains all the necessary required information about maintaining
the supermarket billing system.
The core idea of this project to minimize the paper work and centralize the
data. Here all the communication is taken in secure manner. That is, in this
application the information will be stored in client itself. For further security the
data base is stored in the back-end oracle and so no intruders can access it.
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
原版一模一样【微信：741003700 】【(爱大毕业证书)爱荷华大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】外观非常简单，由纸质材料制成，上面印有校徽、校名、毕业生姓名、专业等信息。
办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
校徽：象征着学校的荣誉和传承。
校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
原版制作(Humboldt毕业证书)柏林大学毕业证学位证一模一样
原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问微bwp0011
【主营项目】
一.毕业证【微bwp0011】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微bwp0011】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Mechatronics material . Mechanical engineering
Mechatronics is a multidisciplinary field that refers to the skill sets needed in the contemporary, advanced automated manufacturing industry. At the intersection of mechanics, electronics, and computing, mechatronics specialists create simpler, smarter systems. Mechatronics is an essential foundation for the expected growth in automation and manufacturing.
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smart pill dispenser is designed to improve medication adherence and safety f...
Smart Pill Dispenser that boosts medication adherence, empowers patients, enables remote monitoring, enhances safety, reduces healthcare costs, and contributes to data-driven healthcare improvements
一比一原版(CalArts毕业证)加利福尼亚艺术学院毕业证如何办理
CalArts毕业证学历书【微信95270640】CalArts毕业证’圣力嘉学院毕业证《Q微信95270640》办理CalArts毕业证√文凭学历制作{CalArts文凭}购买学历学位证书本科硕士,CalArts毕业证学历学位证【实体公司】办毕业证、成绩单、学历认证、学位证、文凭认证、办留信网认证、（网上可查，实体公司，专业可靠）
(诚招代理)办理国外高校毕业证成绩单文凭学位证,真实使馆公证（留学回国人员证明）真实留信网认证国外学历学位认证雅思代考国外学校代申请名校保录开请假条改GPA改成绩ID卡
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1客户提供办理信息：姓名生日专业学位毕业时间等（如信息不确定可以咨询顾问：我们有专业老师帮你查询）；
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3毕业证成绩单电子版做好以后发送给您确认；
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-办理真实使馆公证（即留学回国人员证明）
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-全套服务：毕业证成绩单真实使馆公证真实教育部认证。让您回国发展信心十足！
（详情请加一下 文凭顾问+微信:95270640）欢迎咨询！子小伍玩小伍比山娃小一岁虎头虎脑的很霸气父亲让山娃跟小伍去夏令营听课山娃很高兴夏令营就设在附近一所小学山娃发现那所小学比自己的学校更大更美操场上还铺有塑胶跑道呢里面很多小朋友一班一班的快快乐乐原来城里娃都藏这儿来了怪不得平时见不到他们山娃恍然大悟起来吹拉弹唱琴棋书画山娃都不懂却什么都想学山娃怨自己太笨什么都不会斟酌再三山娃终于选定了学美术当听说每月要交元时父亲犹豫了山娃也说爸算了吧咱学校一学期才转
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
Null Bangalore | Pentesters Approach to AWS IAM
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
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A Digital Twin in computer networking is a virtual representation of a physical network, used to simulate, analyze, and optimize network performance and reliability. It leverages real-time data to enhance network management, predict issues, and improve decision-making processes.
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Silicon control rectifier (scr)
- 1. Silicon Control Rectifier (SCR) By Dr. Saima Beg
- 2. Introduction • The silicon-controlled rectifier(SCR) which is a power electronic device is unquestionable of the greatest interest today. It was first introduced in 1956 by Bell Telephone Laboratories. • It can convert alternating current into direct current and at the same time can control the amount of power fed to the load. • It combines the features of a rectifier and a transistor.
- 3. Important things: • Thyristor is the most important type of power semiconductor devices. • A Thyristor is a four layer, semiconductor of p-n-pn structure with three p-n junctions. It has three terminals, the anode, cathode and the gate. • They are operated as bi-stable switches from nonconducting to conducting state. • This also called uni-lateral switch • The word Thyristor is coined from Thyratron and transistor. It was invented in the year 1957 at Bell Labs.
- 4. Thyristors family • SCR • TRIAC • DIAC • GTO • SUS • SBS
- 5. Latching & Holding current • LATCHING CURRENT (IL) The minimum value of anode current required to turn ON a Thyristors from it’s OFF state and is usually greater than holding current. • HOLDING CURRENT (IH) The minimum value of anode current required for a Thyristors to maintain itself in conduction state
- 6. Basic Construction • A Silicon Controlled Rectifier (SCR) is a four layer solid state device that controls current flow. SCR is a three terminal device. • The terminals are: • Gate (G) • Anode (A) • Cathode (K) • Two main uses of SCR are: Switching Amplification
- 7. • The SCR consists of a four layer p-n-p-n structure with the outer layers are referred to as the anode (ptype) and cathode (n-type). The control terminal of the SCR is named the gate and it is connected to the p- type layer located next to the cathode. • The three junctions are normally denoted as J1 , J2 , and J3 . They are numbered serially with J1 being nearest to the anode.
- 8. • The SCR has three basic states: • 1. Forward blocking mode or off state: In this mode or state the SCR operation is such that it blocks forward current conduction that would normally be carried by a forward biased diode. • 2. Forward conduction mode or on state: In this mode the SCR has reached into conduction. • 3. Reverse blocking mode or off state: In this mode or state the SCR blocks the current in the same way as that of a reverse biased diode.
- 9. THYRISTOR Triggering methods • Thermal Turn on or High Temperature Triggering • Light Triggering • High Voltage Triggering • dv/dt Triggering • Gate Triggering
- 10. Thermal Turn on or High Temperature • The width of depletion layer of SCR decreases with increase in junction temperature. • By increasing the junction temperature the reverse biased junction collapses thus the device starts to conduct. • This type of turn on many cause thermal run away and is usually avoided.
- 11. Application for SCRs: • 1. Rectification • 2. Regulated power suppliers • 3. Static switches • 4. Motor speed controls • 5. Battery charger and heater controls, etc.
- 12. Conclusion • Finally , Silicon control rectifier (SCR) are widely used in many areas of electronics. SCR circuits can be used for many power applications as these electronics components are able to switch high currents very easily. In addition, these electronics components are very cheap and they are widely available.