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Many aspects of a PCB's performance are determined during detailed design,例如由于时间原因,将跟踪设置为特定长度。定时问题也会受到…

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Denso最先进的汽车热设计

用于汽车及其部件的ECU变得越来越复杂和复杂,以生产节能环保的汽车。成功的热设计对制造商来说至关重要。

John Parry明导国际

DENSO Corporation is a leading automotive supplier that designs and manufactures advanced vehicle control technology,系统,and components for major automotive manufacturers all over the world.成立于1949年,Denso总部设在Kariya,Japan,在35个国家开展业务,员工约120人,000 people worldwide.DENSO's Electronic Systems Business Group provides engine,传输,以及电源管理电子控制单元(ECU)和半导体传感器,集成电路,和电源模块。

“我们的印刷电路板设计师使用Flotherm印刷电路板,它有一个用户友好的用户界面和与Flotherm Pack的连接,我们得到了来自IDAJ和Kozo Keikaku Engineering的出色支持,他们分发Mentor图形热分析工具。”“

-Takuya Shinoda,DENSO Corporation

I met up with Takuya Shinoda,技术计划部项目助理经理,Electronics Engineering Division 2,讨论Denso如何使用热模拟来显著减少其设计时间和成本。In this role,他负责发动机控制单元(ECU)的热设计。Shinoda对机械和电气学科都有很好的理解。As he puts it,“热力设计是机电专业的桥梁。热管理主要是机械问题,但是热量是由硅产生的,因此,正确地进行热设计也有必要了解电子学。.

设计挑战

用于汽车及其部件的ECU变得越来越复杂和复杂,以生产节能环保的汽车。成功的热设计对制造商来说至关重要。

The junction temperature of the integrated circuits (ICs) or field effect transistors (FETs) that drive such a vehicle system must fall within a guaranteed temperature range.由于无法直接测量结温,工程师们过去常常根据被测表面温度的假设来预测电子元件的结温,并设置更大的设计裕度。In order to cope with the current aggressive price competition,确保质量很重要,optimize the design margin,实现整体成本效益。

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图1。缩小尺寸的散热驱动技术

仿真节省了设计时间和成本

Shinoda first started looking for a thermal design tool in 2006,having seen fluid flow visualization of a circuit board for the first time at an exhibition.Denso通过严格的基准测试,选择了Flotherm®和Flotherm®PCB作为其在其他工具上的热设计流程。

Before DENSO started using thermal simulation,必须在早期创建一个用于温度测量的物理ECU原型。因此,需要2-3周的准备时间来进行一天半的测试,在最终确定产品之前,可能需要重复几次。

Since 2006,Denso一直在增加模拟的使用,以减少花费在物理原型制作上的时间和成本。到2009年,模拟与物理原型的比率为20:80,到2010年,这一比例增加到了50:50。到2012年,这一比例达到了70:30。This change has resulted in a 50% reduction in both the duration and costs associated with thermal design in less than 6 years.Denso计划更进一步,目标是到2015年将比率提高到90:10以上。

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Figure 2.热管理技术创新

受益于集中的热专业知识

Denso通过集中热技术成功地将热分析引入到制造过程中,and then making this expertise available throughout the 188bet手机官网company.通过听取各设计部门的需求,Shinoda's thermal group is able to quickly improve the quality of design by improving the efficiency of the heat removal using thermal simulation backed up by experiments.

In the thermal design,designers usually focus on changing the case form factors to improve heat dissipation.通过在热设计团队成员之间共享案例设计和电子设计,可以达到最佳效果。Denso决定使用现有的组件模型(图3)。The mechanical team created a smaller case,电路设计团队根据新规范重新设计了10%到20%的电路,测量小组对温度进行了热分析。由于这次合作,Denso能够在2天内为产品创建一个工作的热模型。每个团队的工程师都为这项工作做出了贡献。

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Figure 3.Technological innovation in thermal management

Characterization Supporting Simulation Accuracy

Besides the aforementioned desire to move away from physical prototyping,测量在Denso的热设计过程中有着重要的作用。To support their thermal simulations,DENSO uses Mentor Graphics' T3Ster™ to characterize ECU components and thermal interfaces resistances in situ.The accuracy of the T3Ster data has enabled DENSO to increase the accuracy of their thermal simulations and given them the confident to place such a heavy reliance on simulation.

将t3ster数据的测量值带回Flotherm中,以提高设计期间的结温预测精度,以确保结温不会超过其允许限值。这是一个很高的要求,并要求在仿真模型中具有很高的置信度。今天,agreement on junction temperature rise is to within 10% of experiment,and DENSO aim to increase the agreement further,to be within 5% by 2015.“JEDEC JESD51-14 standard was issued in 2010.与符合旧标准的稳态测量相比,它的精确度和可重复性大大超出了标准。T3Ster is the only product available in the market that complies with this new standard,能够准确估计热阻和结温。Also,using the structure function,t3ster的一个独特特点,可根据测量数据生成简单准确的单元模型。”Shinoda解释道。

Denso发现必须从电子元件中进行精确测量,为了提高仿真精度,从而从设计中消除多余的热裕度。

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图4。Advantages of centralized thermal technology – Simulation & Measurement

The FloTHERM suite of products,包括Flotherm PCB和Flotherm Pack,has become a major toolset and used across the whole of DENSO's thermal design process.Backed up by high accuracy package thermal models,通过使用t3ster测量获得的材料性能数据和界面电阻值,Mentor Graphics的热解决方案帮助Denso在其热设计中实现了90%以上的虚拟化,and a reduction of more than 50% in both development time and cost,预计未来会有更多的储蓄。

“我们的印刷电路板设计师使用Flotherm印刷电路板,which has a very user-friendly user interface and connection with FloTHERM PACK and we get excellent support from IDAJ and KOZO KEIKAKU ENGINEERING who distribute Mentor Graphics thermal analysis tools,“Shinoda说。

特别感谢

多亏了Takuya Shinoda,Denso公司项目助理经理网址:www.globaldenso.com

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