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      新聞動態
      行業新聞
      首頁 > 新聞動態>>行業新聞 >>工業HMI中的電容觸摸

      工業HMI中的電容觸摸

      在工業應用中,傳感器節點、工業儀表和控制面板上的機械按鈕很容易落滿灰塵,而越積越多的灰塵最終會導致設備故障。在工業環境中用電容觸摸機制來替代機械按鈕的人機接口 (HMI) 系統提供諸如更加時尚設計、易于清潔和不容易出現機械故障等優勢。最新的電容觸摸技術在解決某些工業HMI中最棘手難題方面向前邁進了一步。

      抗擾度挑戰

      運行在工業環境中的電機、中繼器和開關會在電力線中注入巨大噪聲。這些噪聲源會在測量信號中的波動與檢測閥值相交時錯誤地觸發一個器件。下面的圖片顯示了電容測量在噪聲出現時會受到哪些影響。

       

      “”

      借助于硬件中內置的多頻率掃描和處理、展頻調制、零交叉檢測,支持電容技術的按鈕會克服系統中噪聲的影響。下面的圖片顯示的是用上面提到的技術所處理的干擾信號。

       

       

      “”

       

      厚保護罩和手套問題

      為了保護電子元器件不受危險和不潔凈環境的影響,工業用面板經常具有一個厚玻璃或塑料保護罩。在不對保護罩進行鉆孔的情況下,通常不太可能將機械按鈕安裝在所需要的地方,而這就容易使面板出現故障。工業環境還經常需要戴著手套進行機器操作。雖然這對于機械按鈕來說不是什么大問題,但這會對電容觸摸解決方案產生巨大影響。

      電容按鈕可以透過60mm厚的玻璃和25mm厚的塑料保護罩正常運轉,這也就在保持保護罩材料完好無損的同時,實現無菌以及危險環境中的使用。

       

      “”

       

      電容按鈕依靠電容值的變化來理解一條命令,當一個接地物體—人手—來到觸摸傳感器的電場中時,檢測被觸發。佩戴工業用手套在人手與電極之間增加了一層絕緣材料(電介質),從而導致不可靠檢測。

      通過使用金屬保護罩,可以在佩戴手套時對電容觸摸屏進行操作。不是測量手進入電場中所導致的電容變化,它測量的是接地金屬保護罩變形彎曲所導致的電容變化。這使得這項技術支持手套友好設計。

       

      “”

       

      低功率運行挑戰

      工業系統中的幾個場發射器由電流環路供電,這就提供了非常有限的功率預算。在保持能夠檢測多達4個按鈕的能力的同時,功耗小于4uA,基于電容的技術能夠為工業用戶提供設定和監視現場設備的能力,且功率開銷極低。

      解決方案

      使用MSP430™ 微控制器 (MCU) CapTIvate™ 技術進行開發能夠幫助避免很多難題。CaTIvate觸摸MCU不僅僅提供一個替代工業HMI系統中機械按鈕的緊湊輕松解決方案,它還解決了現有電容觸摸解決方案中的很多問題,比如說嘈雜環境中的穩健耐用性,經IEC認證的解決方案使它變得支持戴手套操作且功率很低。

      `
    3. 更新時間:2016-06-01
    4. 發布者:王先生
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