描述
风速为0m/s时,设计R2和Ptl000阻值之比小于R1和(Pt l00+R3)之比,放大器输出低电平,晶体管基极电位降低,晶体管Ql集电极电流增大,由于两个半桥的分流比约为10:1,由并联电路分流原理知Ptl00电流增大,使得铂热电阻阻值增加,c点电压降低,最终反馈电路调解使c点电位和d点接近,达到平衡状态,并以c点电压作为表征风速的输出值。当风速增大时,对流散热增加,Ptl00温度降低,其阻值减小,使得c点电压高于d点电压,放大器输出电压降低,导致晶体管Q1基极电流增加,集电极电流升高使得Ptl00阻值增加,最终达到一新的稳定平衡点。由上述分析可知,风速增大,受控电流增
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