Fluxgate Current Sensor Based on Digital Detection
The traditional self-excited fluxgate current sensor is usually based on the average current method to measure the current.Its structure is complex and the measurement bandwidth and response time are limited by the filter cut-off frequency.This paper designed a sensor to measure complex leakage current,which was based on the digital detection method of duty cycle sam-pling.The sensor used single chip microcomputer to measure the duty cycle of excitation signal,and demodulated and processed signal was finished by digital algorithm.The sensor adopted open-loop design and saved the filter circuit and AD converter,which reduced the cost.The experimental result shows that comparing with the sensor based on average current method,the bandwidth and response time performance of this sensor are better.
fluxgate current sensordigital methodlow frequency open loop applicationduty cycle model
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