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《Electronic Measurement Technology》 2010-10
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Application of true RMS measurement circuit in frequency converter

Liu Xianzheng1 Yang Cheng'en2 Wang Ying1(1.Sinovel Wind Group Co.,Ltd.Beijing 100081;2.Information Science and Technology College,Dalian Maritime University,Dalian 116026)  
The large wind turbine generator system's frequency converter with regulator features needs to be adjusted and protected by measuring voltage and current of the load.For this requirement,a measurement circuit based on RMS-DC chip,which called ltc1968,has been designed,the principle of true RMS measurement and the method of output voltage measuring and output over-current protection has been given in this paper.The experiment shows that the circuit has features of high precision,fast response and small size,the accuracy of the output and the converter's safely operation has been ensured.
【CateGory Index】: TN773
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