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恒温加热用PTC热敏电阻器
散热片

恒温加热用PTC热敏电阻器

刘涛 2015-04-16 14:18:10 0浏览

产品概述恒温加热用PTC热敏电阻的恒温发热特性, 是由材料特性决定的。其原理是当PTC热敏电阻通上电后,因为自热,导致元件本体温度上升,电阻值进入跃变区,电流迅速下降,于是恒温加热PTC热敏电阻表面温度持续保持恒定值。该温度只与PTC热敏电阻的居里温度和外加电压有关,而与环境温度基本无关。PTC恒温加热器就是利用恒温加热PTC热敏电阻恒温发热特性设计的加热器件。在中小功率加热场合,PTC加热器具有恒...

Minimizing acoustical noise in electronic systems
Design

Minimizing acoustical noise in electronic systems

刘涛 2015-03-26 22:19:11 7浏览

IntroductionAir-moving devices (AMDs), such as fans and blowers used for cooling in electronic systems invariably generate acoustical noise which must be considered if people are exposed to the emitted noise. In this article, we discuss quantitative measu

Minco Releases New Flex Circuit Design Guide
News

Minco Releases New Flex Circuit Design Guide

刘涛 2015-03-19 12:35:53 8浏览

Minneapolis, MN, 1 December 2014—Minco, a provider of flex circuit, thermal, and temperature sensing and control solutions for high-reliability applications, has released its new Flex Circuit Design Guide. The Flex Circuit Design Guide provides tools and

Thermal Venting with Thermal Vias
Design

Thermal Venting with Thermal Vias

刘涛 2015-03-19 10:10:57 11浏览

Thermal vias are merely one tool, albeit sometimes an important tool, in the thermal engineer’s arsenal of techniques for getting heat away from potentially overheating electronics components. The problem is, vias don’t actually “cool” a hot device in and

IP Rating
Design

IP Rating

刘涛 2015-03-19 10:04:04 7浏览

The IP (Ingress Protection) standard describes a uniform system for classifying the degrees of protection provided by the enclosures of electrical equipment. The first number refers to the level of protection against penetration of solid objects into the

Cooler Master Demos 3D Vapor Chamber CPU Cooler Tech
News

Cooler Master Demos 3D Vapor Chamber CPU Cooler Tech

刘涛 2015-03-16 12:36:50 11浏览

Cooler Master showed us its next generation CPU cooling technology at CES 2015, which it calls "3D Vapor Chamber." Simply put, it's an evolution of the company's vapor chamber technology. Vapor chambers for CPU coolers are sealed, flat-i

如何进行热敏电阻测量
Design

如何进行热敏电阻测量

刘涛 2015-03-10 10:31:23 8浏览

概览本文档属于《常规测量指南》的一部分。目录热敏电阻概览如何进行热敏电阻测量软硬件推荐热敏电阻在线研讨会、指南和其它学习资源1. 热敏电阻概览与RTD相似,热敏电阻也是温度敏感的半导体,其阻抗随温度而变化。热敏电阻由以玻璃或环氧珠封装的金属氧化物半导体材料制造而成。而且,热敏电阻的典型标称阻抗值要比RTD高得多,阻抗值从2000Ω到10,000Ω,故可用于较低电流的测量。图1. 热敏电阻的常用符号表示每个传感器都...

PCB的线宽,线径与电流的关系在线计算
Design

PCB的线宽,线径与电流的关系在线计算

刘涛 2015-02-11 10:49:27 19浏览

  随着技术的发展,电子设备的体积空间也越来越小,电子元器件密度越来越大,PCB的布线密度越来越高。如果不注意散热和和提高走线宽度,温升和线路上的电压降和功率消耗就会导致电子设备的可靠性严重下降。既考虑散热,又考虑PCB走线上的电压降,PCB走线是要讲究一些规则的。PCB的散热问题很复杂,空间的密闭与否和PCB上贴装的元件都会对PCB的温升产生很大的影响。这里不考虑贴装元器件的影响,仅考虑空气中自...

PCB线宽图表
Design

PCB线宽图表

刘涛 2015-02-05 18:14:19 33浏览

来自Minco的设计图表,辅助根据最大电流选择合适的线缆直径

产品热设计思路流程
Design

产品热设计思路流程

刘涛 2015-02-05 00:32:52 44浏览

如果遵从热设计的基本原则进行设计,经过热设计之后的电子系统性能更好、可靠性更高,并且使用寿命更长。