Constant-current control method of multi-function electromagnetic transmitter

The Review of Scientific Instruments
Kaichang XueJun Lin

Abstract

Based on the requirements of controlled source audio-frequency magnetotelluric, DC resistivity, and induced polarization, a constant-current control method is proposed. Using the required current waveforms in prospecting as a standard, the causes of current waveform distortion and current waveform distortion's effects on prospecting are analyzed. A cascaded topology is adopted to achieve 40 kW constant-current transmitter. The responsive speed and precision are analyzed. According to the power circuit of the transmitting system, the circuit structure of the pulse width modulation (PWM) constant-current controller is designed. After establishing the power circuit model of the transmitting system and the PWM constant-current controller model, analyzing the influence of ripple current, and designing an open-loop transfer function according to the amplitude-frequency characteristic curves, the parameters of the PWM constant-current controller are determined. The open-loop transfer function indicates that the loop gain is no less than 28 dB below 160 Hz, which assures the responsive speed of the transmitting system; the phase margin is 45°, which assures the stabilization of the transmitting system. Experimental results verify that ...Continue Reading

References

Jan 1, 1996·Physical Review. D·J Z BaiP Q Li
Jun 8, 2013·The Review of Scientific Instruments·O D CortázarD E Anderson

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Citations

Apr 3, 2016·The Review of Scientific Instruments·Haigen ZhouXinsen Zeng

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