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The Secret Path (TV Movie 1999) ⭐ 7
Life Hacks & Productivity

The Secret Path (TV Movie 1999) ⭐ 7

The secret path, saw it today on Lifetime. Oh my goodness, what can I say except I loved it. I thought the story was so sad and yet there was hope laced throughout the story. Just when you think it can’t be any worse, the child runs towards hope and love.I was glued to the…

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Life Hacks & Productivity

Solved: How to handle exception with Boost Asio and C/C++

At the moment, i’m using Boost Asio in order to connect to a server via TCP.I use a conditional case to decide if the application has to start or not a connection with the server; it works great but the…

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零基础掌握先进的PFC+LLC解决方案
Life Hacks & Productivity

零基础掌握先进的PFC+LLC解决方案

一、PFC 篇在电能质量和用电效率越来越重要的背景下,采用 PFC+LLC 架构的电源设计越来越普及,并已经开始在很多应用中替代传统的无 PFC 的方案或简单的反激、正激方案。今天我们从基础说起,让各位从入门到精通掌握 PFC+LLC 的先进解决方案。https://xg.zhihu.com/plugin/9a33b7d908c5528bff0100225a7c8980?BIZ=ECOMMERCE首先,为什么要用 PFC?一个没有 PFC 的电源在 AC 输入端的波形通常是长这样的:一想到这么多尖尖电流在我们的电网里流通,是不是有种如坐针毡的感觉?PFC 就是用来解决这个问题的。虽然听起来就很贵的样子,但是 PFC 可以把 AC 输入端的波形变成这样,不止可以保护电网质量,还能治好工程师的强迫症(手动狗头)。PFC 可以有很多种不同实现方式,但大部分实用电路都是在 Boost 或在 Boost 基础上的衍生变形。而从控制方式的角度来说,PFC 主要可以分为 CCM 和 CrM 两类。CCM 控制是指 Boost 电路中的电感电流处于连续导通状态,这样的好处可以用峰值比较低的电感电流实现比较大的输出功率,但同时所带来的问题是二极管反向恢复引入的开关损耗;CrM 控制是指 Boost 电路中的电感电流处于临界导通状态,这种状态下二极管电流是自然过零关断的,所以没有反向恢复问题,但在实现同等输出功率的情况下,CrM 的电感电流峰值必然大于 CCM,这不利于电感设计。基于上述特点,CCM 适合更大功率,而 CrM 适合较小的功率。二者的合理分界线通常在 300W-400W…

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Life Hacks & Productivity

Seeking a State Job? Start here

CalCareers Online Exams: The Accountant 1 (Specialist) exam will be offline for maintenance beginning Tuesday, 06/05/2025 and will be back up by Monday, 06/16/2025 at 8:00 am. We apologize for the inconvenience. CalHR Job Center: The CalHR Job Center, located…

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These 30 Life Hacks Have Saved People Up to Four
Life Hacks & Productivity

These 30 Life Hacks Have Saved People Up to Four

Ever picked up a time-saving ‘life hack’ from an online video? Today might be a good day to start because a new study suggests that those little tips and tricks save people almost four hours of effort every week. That’s…

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