描述

風(fēng)速為0m/s時，設(shè)計R2和Ptl000阻值之比小于R1和(Pt l00+R3)之比，放大器輸出低電平，晶體管基極電位降低，晶體管Ql集電極電流增大，由于兩個半橋的分流比約為10：1，由并聯(lián)電路分流原理知Ptl00電流增大，使得鉑熱電阻阻值增加，c點電壓降低，最終反饋電路調(diào)解使c點電位和d點接近，達到平衡狀態(tài)，并以c點電壓作為表征風(fēng)速的輸出值。當(dāng)風(fēng)速增大時，對流散熱增加，Ptl00溫度降低，其阻值減小，使得c點電壓高于d點電壓，放大器輸出電壓降低，導(dǎo)致晶體管Q1基極電流增加，集電極電流升高使得Ptl00阻值增加，最終達到一新的穩(wěn)定平衡點。由上述分析可知，風(fēng)速增大，受控電流增

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