Development of drive circuit for ultra-audio controlled source electromagnetic transmitter

Electromagnetic transmitters serve as pivotal equipment in subterranean exploration endeavors. The current study addresses the frequency emission spectrum for deep (200m~2000m) mining resource exploration, spanning from 0.1Hz to 10kHz, and highlights the necessity for emitting high-power alternating current signals in the hundreds of kHz range for fine detection in shallow to intermediate depths (0~200m). The transition from conventional Insulated Gate Bipolar Transistor (IGBT) devices to Silicon Carbide Metal-Oxide-Semiconductor Field-Effect Transistor (SiC-MOSFETs), which are better suited for high-frequency and high-voltage applications, is discussed. The absence of an appropriate SiC-MOSFET driver circuit that aligns with the specific application requirements of electromagnetic transmitters is identified as a significant gap in the field. In response to this challenge, the paper introduces a novel driver circuit design specifically engineered for ultra-high-frequency controlled-source electromagnetic transmitters. The proposed design integrates a DC-DC isolation circuit, a driver amplification circuit, a voltage monitoring circuit, an anticrosstalk circuit, and a spike suppression circuit. This design notably mitigates the crosstalk effect on the switchgear of the upper and lower bridge arms in the inverter transmission circuit, thereby facilitating a stable output of the maximum emission voltage. Through comprehensive simulation and experimental analyses, the efficacy of the proposed driver circuit is validated, demonstrating its capability to supply a driving signal ranging from 10 kHz to 600 kHz for the selected SiC-MOSFET. This achievement marks a significant advancement in the stable output of high-frequency, high-power transmission signals, providing a robust technological foundation for enhancing fine detection capabilities at shallow and intermediate depths. This work contributes to the broader field of electromagnetic exploration by addressing a critical need for improved transmission technology in the exploration of subsurface resources.