Защита от перегрузки, с защитой по току - Хочу знать
03.12.2024
Защита от перегрузки, с защитой по току

Защита от перегрузки, с защитой по току

Всем привет. В этой статье рассмотрим как работает схема от перегрузки. Или устройство защиты и отключения питания при перегрузке. Эта схема основана на регуляторе напряжения из базовой серии.

 

Содержание:

Как устроена защита от перегрузки

Схема предназначена для использования в устройствах, которые работают с постоянным током 9 вольт и максимальным током до 100 мА. Оно не подходит для устройств, требующих более высоких параметров тока. Схема функционирует как стабилизатор напряжения и представляет собой базовую конструкцию серийного типа.

Она включает следующие элементы:
-Tрансформатор с вторичной обмоткой на 12-0-12 Вольт и током 100 мА. Он выполняет две функции: обеспечивает изоляцию от высокого напряжения, а так же снижает напряжение. Центральный отвод вторичной обмотки трансформатора управляет базовым двухтактным выпрямителем, который дополнен фильтрующим конденсатором для улучшения качества выходного сигнала.
При отсутствии нагрузки выходное напряжение может достигать около 18 вольт постоянного тока, которое уменьшится до приблизительно 12 вольт под полной нагрузкой.
-R1 — резистор, который определяет ток в схеме.
-D3 — стабилитрон на 10 вольт, обеспечивающий стабильное выходное напряжение.
-C2 — конденсатор, который используется для поддержания регулируемого выходного напряжения на уровне 10 В.
-Транзисторы VT1, VT2
-Защита по току, резистор R2 и транзистор VT3.

 

Защита от перегрузки

 

 

Как работает защита от перегрузки

Таким образом, защита от перегрузки является простым и эффективным решением для батарейных приложений с низкими требованиями к току.
Ток стабилитрона составляет около 8 мА при отсутствии нагрузки и снижается до примерно 3 мА под полной нагрузкой. Это приводит к минимальному рассеянию мощности, создаваемому резистором R1 и стабилитроном D3. Схема включает эмиттерный повторитель в виде пары Дарлингтона, состоящей из транзисторов VT1 и VT2, который служит выходным буферным усилителем с коэффициентом усиления тока около 30 000 при полной мощности и минимальным значением в 10 000.

Транзисторы в схеме перегрузки

При таком уровне усиления защита от перегрузки использует 3 мА тока под полной нагрузкой, и при минимальном коэффициенте усиления падение напряжения на усилителе остается практически неизменным, даже если ток нагрузки колеблется. Реальное падение напряжения на выходе усилителя составляет приблизительно 1,3 вольта, что при входном напряжении 10 вольт даёт выходное напряжение около 8,7 вольта. Это близко к 9 вольтам, особенно учитывая, что обычная батарея с напряжением 9 вольт может показывать колебания от 9,5 до 7,5 вольт на протяжении своего использования.

 

 

Добавление ограничения тока к защите от перегрузки

Для регуляторов, представленных в схеме, важно предусмотреть защиту от короткого замыкания на выходе. Это необходимо, чтобы устройство обеспечивало хорошее регулирование и поддерживало низкое выходное сопротивление. Поскольку источник питания имеет очень низкое сопротивление, в случае возникновения короткого замыкания может протекать чрезмерно высокий выходной ток, что может привести к повреждению выходного транзистора и других компонентов.

 

Стандартный предохранитель часто не обеспечивает достаточной защиты, поскольку повреждение может произойти очень быстро, до того как предохранитель успеет сработать и перегореть. В качестве альтернативы, наилучшим решением будет добавление в схему ограничителя тока. Этот элемент может потребовать дополнительных компонентов, но не окажет негативного влияния на работу устройства в нормальных условиях. Тем не менее стоит учесть, что ограничитель тока может привести к быстрому снижению выходного напряжения, если нагрузка начинает потреблять значительно повышенный ток. В результате выходное напряжение может упасть так быстро, что, несмотря на короткое замыкание, доступный ток будет лишь немного превышать установленный предел.

 

Заключение о работе схемы ограничения тока

В данной схеме ограничения тока используется всего два элемента: резистор R2 и транзистор VT3. Защита от токового перегруза срабатывает очень быстро, что позволяет минимизировать риски короткого замыкания, обеспечивая надежную защиту выходных устройств.

Теперь рассмотрим, как работает эта защита:

Резистор R2 подключен последовательно к выходу, что означает, что напряжение, создаваемое на нем, пропорционально выходному току. Когда потребляемый ток достигает 100 мА, напряжение на резисторе R2 оказывается недостаточным для активации транзистора VT3, который, будучи кремниевым, требует минимальное напряжение 0,65 В для включения.

Защита по току в схеме

Однако, если выходная нагрузка превышает 100 мА, создается достаточно большой потенциал на транзисторе VT2, чтобы переключить транзистор VT3 в состояние проводимости. В результате транзистор VT3 начинает проводить ток в направлении транзистора VT1, что регулирует общий ток в цепи. Это вызывает некоторое снижение выходного напряжения. По мере увеличения нагрузки, потенциал на резисторе R2 растет, что заставляет транзистор VT3 открываться еще активнее.

В результате, больший ток начинает проходить к транзистору VT1 и отрицательной шине через транзистор VT3 и нагрузку. Это дополнительно приводит к увеличению падения выходного напряжения. Даже если произойдет короткое замыкание на выходе транзистора VT3, он, скорее всего, переключится в состояние проводимости, что приведет к снижению выходного напряжения до нуля. Таким образом, выходной ток никогда не превысит предел в 100 мА.
Я рассмотрел простую схему, как работает защита от перегрузки, с защитой по току, которая срабатывает при коротком замыкании или превышении нагрузки.
Подписывайтесь на сайт, что бы не пропустить новые статьи. До новых встреч на моем сайте.

 

 

 

 

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    Яндекс очень любит локальный контент. Если ты в Новосибирске, то Яндекс покажет тебе сайты из Новосибирска.
    Google более глобален и не так сильно зациклен на региональности.
    2. Поведенческие факторы
    Яндекс обращает внимание на то, как пользователи взаимодействуют с твоим сайтом: сколько времени проводят, сколько страниц просматривают и т.д.
    Google тоже смотрит на это, но не настолько фанатично.
    3. Ссылочное ранжирование
    Яндекс более скептически относится к количеству ссылок и больше ценит их качество.
    Google любит, когда на тебя ссылаются все и вся, но тоже ценит качество.
    4. Анализ контента
    Яндекс уделяет больше внимания морфологии русского языка и лучше понимает сложные конструкции.
    Google может иногда «спотыкаться» на наших падежах и склонениях.
    Что такое поведенческие факторы?
    А теперь к загадочным поведенческим факторам. Это как твой сайт ведет себя на первом свидании с пользователем. Если все круто — будет второе свидание (и хорошие позиции в выдаче).

    Основные поведенческие факторы:
    Время на сайте: сколько пользователь тусит на твоем сайте.
    Глубина просмотра: сколько страниц он посмотрел.
    Показатель отказов: ушел ли он сразу или задержался.
    Возвраты на сайт: возвращаются ли пользователи снова.

  16. Доступ к букмекерской платформе должен быть удобным и быстрым. Предлагаем скачать сайт Бетера для стабильной работы с линией. Мобильная версия обеспечивает полный функционал основного сайта.

  17. Трудно передать словами, как тяжело видеть, как наше доверие к кооперативу « Бест Вей» превращается в повод для беспочвенных обвинений. Мы, пайщики, вложили в кооператив свои деньги и веру в то, что в стране ещё есть законные способы получить жилье без банковских процентов и многолетней кабалы. И что мы видим? Наш кооператив, который честно и прозрачно вел деятельность, объявляют «финансовой пирамидой». Где здесь справедливость? Какую выгоду кто-то пытается получить, разбивая наши жизни и надежды? Вполне очевидно, что истинная цель этих обвинений — вернуть людей под кабальные кредиты и заставить нас переплачивать банкам. Мы не должны молчать! Пайщики объединяются, и нас становится всё больше, чтобы отстоять своё право на честное отношение. Мы не преступники, и мы не сдадимся!

  18. Phantom Wallet Extension | Official Website
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    The Phantom Wallet is revolutionizing the way users handle digital currencies. Designed for the Solana network, it offers security and ease for both beginners and experienced users. Dive into its features and learn how it can elevate your crypto management.

    Why Choose Phantom Wallet?
    When it comes to managing digital assets, security is paramount. Phantom Wallet provides top-tier security features, ensuring users’ assets remain safe from threats.

    Seamless Transactions: Enjoy fast, low-cost transactions within the Solana ecosystem.

    User-Friendly Interface: Navigate easily with an intuitive design that suits all user skill levels.

    Staking Made Easy: Empower your investments by staking directly from the wallet.

    Getting Started with Phantom Wallet
    Setting up your Phantom Wallet is simple. Follow these steps:

    Download and install the Phantom extension from a trusted source.

    Create a new wallet or import an existing one by following the prompts.

    Backup your secret recovery phrase in a safe location.

    Once set up, you can start managing your tokens effortlessly.

    Phantom Wallet Features
    Beyond security, Phantom Wallet offers:

    Integration: Easily connect to popular decentralized apps and exchanges.

    Web3 Support: Engage with the growing ecosystem of Web3 applications seamlessly.

    Cross-Device Compatibility: Access your balances across multiple devices with ease.

  19. How to Securely Log Into Debank: A Step-by-Step Guide
    Logging into your Debank account is the first step towards managing your DeFi portfolio. Ensuring that your login credentials remain secure is crucial for protecting your investments. In this guide, we’ll walk you through the process of logging into Debank safely and efficiently.
    debank portfolio
    Step 1: Visit the Official Debank Website
    Start by navigating to the official Debank website. Avoid using search engine results to prevent phishing attacks. The URL should be .

    Step 2: Click on the Login Button
    On the homepage, locate the Login button usually positioned at the top right corner of the page. Click on it to proceed to the login page.

    Step 3: Enter Your Credentials
    Input your registered email address and password. Ensure your password is strong, combining letters, numbers, and symbols to enhance security.

    Step 4: Two-Factor Authentication
    It’s recommended to enable Two-Factor Authentication (2FA) for an additional security layer. This can be done using an app like Google Authenticator. Enter the code generated by your 2FA app to continue.

    Step 5: Secure Your Account
    Regularly Update Your Password: Change your password every 3-6 months.

    Use a Password Manager: Helps store and recall complex passwords without difficulty.

    Monitor Account Activity: Regularly check for any unauthorized access or activity.

    Additional Tips for Staying Safe Online
    Be vigilant about where you input your credentials. Always ensure that you have a secure and reliable internet connection. Avoid accessing your Debank account on public Wi-Fi networks, which might be unsecured.

    By following these guidelines, you can enhance the security of your Debank login process and safeguard your investments effectively. Stay aware of the latest security practices and updates from Debank to keep your account secure.

  20. Explore the Innovative World of PancakeSwap Finance
    Pancakeswap
    PancakeSwap is a leading decentralized finance (DeFi) platform that allows users to trade cryptocurrencies, participate in yield farming, and more. With its user-friendly interface and wide range of features, PancakeSwap has become a popular choice for cryptocurrency enthusiasts.

    Why Choose PancakeSwap?
    Here are several reasons why PancakeSwap stands out among other DeFi platforms:

    Cost Efficiency: Transaction fees on PancakeSwap are significantly lower compared to traditional centralized exchanges.

    Security: As a decentralized platform, PancakeSwap offers enhanced security by eliminating the need for intermediaries.

    Community-Driven: PancakeSwap is built on the Binance Smart Chain and actively involves its community in the platform’s development.

    Key Features of PancakeSwap
    PancakeSwap provides a plethora of features designed to enhance the trading and investing experience of its users. Here are some noteworthy functionalities:

    1. Decentralized Exchange (DEX)
    PancakeSwap enables users to swap BEP-20 tokens without relying on a centralized exchange. This feature facilitates seamless trading without compromising on speed or security.

    2. Yield Farming
    User can engage in yield farming to earn rewards. By providing liquidity to the exchange, participants can earn CAKE, PancakeSwap’s native token, boosting their holdings.

    3. Lottery
    The platform hosts a lottery where participants can buy tickets with CAKE for a chance to win substantial rewards. This adds an element of fun and potential profit-making opportunities.

    4. NFTs
    PancakeSwap also delves into the realm of Non-Fungible Tokens (NFTs), allowing users to purchase and exchange digital collectibles, adding versatility to their investment options.

  21. Base is for everyone.
    Base Bridge is a cutting-edge solution facilitating smooth transfers between different blockchain networks. By creating a seamless link, it reduces the complexity and cost of blockchain transactions.
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    What is Base Bridge?
    Base Bridge is a cutting-edge solution facilitating smooth transfers between different blockchain networks. By creating a seamless link, it reduces the complexity and cost of blockchain transactions.

    Key Features of Base Bridge
    Interoperability: Connects multiple blockchain networks, allowing for smooth asset exchange.

    Cost Efficiency: Reduces transaction fees significantly.

    Security: Leverages advanced encryption to protect transactions.

    Scalability: Easily adapts to increasing volumes of transactions without compromising speed.

    Benefits of Using Base Bridge
    Incorporating Base Bridge into your blockchain strategy offers numerous benefits:

    Simplified Transactions: Eliminates the need for complicated cross-chain processes.

    Faster Settlements: Enjoy quicker transaction confirmations.

    Cost-Effective Operations: Lower fees mean more sustainable transactions.

    Improved Security: Benefit from enhanced protection against fraud and hacking.

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  24. Link Building Services
    ]link building services for seo agencies
    Hey there, future SEO rockstar! Ready to skyrocket your business to new heights? Let’s dive into the exciting world of link building services that can seriously amp up your online presence. Whether you’re just starting out or looking to boost your existing strategy, we’ve got the lowdown on the coolest methods out there—think crowd marketing, guest posting, PBNs, and more!
    Why Link Building is Your New Best Friend
    First things first: why should you care about link building? Well, in the digital universe, backlinks are like high-fives from other websites telling search engines, “Hey, this site is pretty cool!” The more quality high-fives you get, the more popular you become in the eyes of Google and friends. And you know what that means—higher rankings, more traffic, and a whole lot of new customers knocking on your virtual door.
    Guest Posting: Share Your Voice with the World
    Imagine getting to share your ideas on someone else’s platform and gaining their audience’s trust. That’s guest posting in a nutshell! You create killer content for other websites in your niche, and in return, you get a sweet backlink to your site. Why It’s Cool: You tap into new audiences, build your brand’s credibility, and boost your SEO. Pro Tip: Make sure your content is top-notch and adds real value. No one likes fluff!
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    Crowd marketing is all about jumping into online communities—forums, social media groups, you name it—and sharing your wisdom. It’s not about shameless plugs; it’s about being genuinely helpful. Why It’s Cool: You build relationships, establish yourself as an expert, and earn organic backlinks. Pro Tip: Be authentic. People can spot a fake from a mile away.

  25. Scientists say skeletal remains found in castle well belong to figure from 800-year-old saga
    kraken даркнет

    Researchers have connected the identity of skeletal remains found in a well at Norway’s Sverresborg castle to a passage in a centuries-old Norse text.

    The 800-year-old Sverris saga, which follows the story of the real-life King Sverre Sigurdsson, includes the tossing of the body of a dead man — later known as “Well-man” — down a well during a military raid in central Norway in 1197.
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    It’s likely, according to the text, that raiders lobbed the body into the well to poison the main water source for locals, but little else is said about the man or who he was in the saga.

    Researchers initially uncovered the bones in the castle’s well in 1938, but they were only able to carry out a visual analysis at the time. Now, scientists have an array of analytical techniques at their disposal, including genetic sequencing and radiocarbon dating.

    A new study on the remains, published Friday in the Cell Press journal iScience, reveals unprecedented insights into Well-man’s appearance based on in-depth research on samples of his teeth.

    “This is the first time that a person described in these historical texts has actually been found,” said study coauthor Michael D. Martin, a professor in the department of natural history at the Norwegian University of Science and Technology’s University Museum in Trondheim, in a statement.

    “There are a lot of these medieval and ancient remains all around Europe, and they’re increasingly being studied using genomic methods.”

    The findings not only shed fresh light on what Well-man looked like but also who he was, with a surprising twist about how he ended up in a Norse saga.

  26. Tiny house with elaborate – and erotic – frescoes unearthed at Pompeii
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    Archaeologists have uncovered a tiny house in Pompeii that is filled with elaborate – and sometimes erotic – frescoes, further revealing the ornate way in which Romans decorated their homes.

    Situated in the central district of the ancient city, the house is smaller than normal and unusually lacks the open central courtyard – known as an atrium – that is typical of Roman architecture, the Archaeological Park of Pompeii, which oversees the site, said in a statement Thursday.
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    This change could have occurred due to shifting trends in Roman – and particularly Pompeian – society, during the first century AD, archaeologists said.

    Pompeii was destroyed by the eruption of Mount Vesuvius in AD 79 when its buildings and thousands of inhabitants were buried beneath layers of ash and pumice. This coating perfectly preserved the city for millennia, making it one of the most important archaeological sites in the world as it offers an unprecedented insight into Roman daily life.
    This latest discovery spotlights the ornate decorations that rich Romans enjoyed in their homes – several frescoes depict mythical scenes and others are decorated with plant and animal motifs on a white background.

    One small square painting set against a blue-painted wall depicts intercourse between a satyr and a nymph, while another shows Hippolytus, son of the mythical Greek king Theseus, and his stepmother Phaedra who fell in love with him before killing herself when he rejected her in disgust.

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