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    2. ◆ 追求卓越,共振和諧!  ◆ 定制超聲波壓電陶瓷元件:霧化片 超聲醫療頭 美容頭 美容鏟皮刀 潔牙器振子 陶瓷晶片   ◆ “誠信經營、精益求精”是我們永遠的追求!      >> English   >> 簡體<-> 繁體   >> 加入收藏    
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      陶瓷晶振(諧振器)概要


      www.elainecharton.com 2010年1月17日

                 陶瓷諧振器是利用壓電陶瓷 ( 通常為PZT系 ) 適當振動模式(表1)的機械性共振的振蕩元件。陶瓷諧振器作為操作微處理器所需的標準信號發生器(timing clock)加以利用,并隨電子技術的快速發展,其需求顯著增加。 

      諧振器的特點有: 

      振蕩頻率的溫度穩定性好。 
      具有石英晶體振蕩器與LC或RC振蕩電路的中間位置的Q值。構成振蕩電路的振蕩頻率溫度系數(Tcfosc)應為在-20 ~ +85℃的范圍內,體現10-5/℃左右(±30ppm/℃左右)。


      小型、輕量
      目前銷售的產品尺寸有:7.2×3.4×1.8t(mm)、3.7×3.1×T(mm)、2.5 × 2.0 ×1.0t(mm) & 2.0 x 1.2 x 1.0t(mm),輕薄簡單。


      振蕩電路自由調整、低價格。



       

      壓電諧振器利用在施加機械應力時,隨著出現電荷的壓電現象和電信號,產生機械應力,即振動的逆電壓現象。

      圖1 )SMD型MHz 陶瓷諧振器2端子結構

             將交流信號施加到壓電試片上,隨著其試片的外形和極化方向電場的方向,產生各種振動,這時各振動作為交流頻率函數具有圖2-1)所示的等效電路,其阻抗特點如圖2-2)所示。這時阻抗變為最小的頻率稱作諧振頻率(resonant frequency),變為最大的頻率稱作反諧振頻率(antiresonant frequency)。

      圖2-1)壓電諧振器的等效電路
        圖2-2)壓電諧振器的阻抗特點

             功能諧振器根據頻率帶利用不同振動形態,但基本上屬于2端子型壓電振動器。2端子型振動器的信號及等效電路如圖2-1所示。其兩端阻抗(Z)的大小│Z│及相位∠Z (=φ=tan-1(X/R))的頻率特點如圖2-2所示。


      使用諧振器的振蕩電路如圖2-2所示,利用在Fr和Fa之間的阻抗帶有誘導性的領域。


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