A dc voltage sensor using the AD654 chip and its compensation method for temperature drift of sensing signal
A novel optoelectronic voltage sensor together with its compensation method for temperature drift of sensing signal is proposed which is based on voltage-to-frequency conversion.The voltage sensing system is mainly composed of resistance voltage divider,voltage-to-frequency converter,light emitting diode,optical fiber,photo de-tector,and sensing signal processor.Two pieces of AD654 chip are respectively used as voltage and temperature sen-sors.The real-time compensation for temperature drift of voltage sensing signal can be achieved by using the nonlinear fitting for experimental data from two branches of light sensing signals.The dc voltage in the range of 0.6～5.0 kV has been measured by use of the above proposed voltage sensor.The temperature drift of voltage sensing signal has been suppressed effectively.And the average relative error due to temperature drift is within±0.7％in the temperature range of-40～60 ℃.
optoelectronic voltage sensorvoltage-to-frequency conversionAD654 chipcompensation for tem-perature drift of sensing signal
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维普
