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    188宝金博页面版: 压电片散热性能

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    内容提示： 12The Performance of a Heat Sink with Piezoelectric Fins Figure 1. STAR LED Heat Sink (courtesy of Advanced Thermal Solutions, Inc.)An LED light is often made of a small piece of semiconductor, an integrated optical lens used to shape its radiation pattern, and a heat sink, used to dissipate heat and maintain the semiconductor at a low operating temperature. LED lights present many advantages over incandescent light sources, including lower energy consumption, longer lifetime, improved physical robustness...

    文档格式：PDF | 页数：5 | 浏览次数：19 | 上传日期：2015-04-11 10:09:03 | 文档星级：
    12The Performance of a Heat Sink with Piezoelectric Fins Figure 1. STAR LED Heat Sink (courtesy of Advanced Thermal Solutions, Inc.)An LED light is often made of a small piece of semiconductor, an integrated optical lens used to shape its radiation pattern, and a heat sink, used to dissipate heat and maintain the semiconductor at a low operating temperature. LED lights present many advantages over incandescent light sources, including lower energy consumption, longer lifetime, improved physical robustness, smaller size and faster switching. LED lights are powerful enough for room and street lighting and are relatively expensive. They also require more precise current and heat management than traditional incandescent and compact fluorescent lamp sources of comparable output.The performance and life expectation of an LED light directly links to the semiconductor temperature, so-called “junction temperature”. Generally, the lower the junction temperature is, the better the performance and the longer the life of the LEDs. To increase the durability and the lighting quality of the LEDs, thermal management is a critical aspect of the design. For indoor lighting applications, using a mechanical fan/blower to cool the LED is out of question, due to acoustic noise and reliability concerns. So, most LED lights used in homes are cooled with heat sinks by natural convection (see Figure 1). However, for high power LEDs, this passive thermal solution will reach its performance limit due to low convective heat transfer coefficient, space limitations and weight restriction. Some engineers have introduced piezoelectric fans and synthetic air jets into LED light cooling to enhance the convection heat transfer. Other researchers, Ma et al. [1], proposed the use of heat sinks with piezoelectric fins. This paper discusses this novel concept of cooling LED heat sinks. The piezoelectric effect is the linear electromechanical interaction between the mechanical and the electrical state in crystalline materials. The piezoelectric effect is a reversible process, in that materials exhibiting the direct piezoelectric effect (the internal generation of electrical charge resulting from an applied

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