Abstract
Transient electromagnetic method (TEM), also known as time domain transient electromagnetic emission theory, is one of the most common detection methods. Transient electromagnetic method is of great significance in the detection of complex terrain sources. Existing electromagnetic emission systems mainly adapt passive or active absorption and high voltage clamp methods. These methods have relatively large turn-off delay, which will increase the detection blind zone of medium and shallow resources. In this article, two sequence controlled inverter transmitting systems are proposed. Scheme I can control the number of transmitting coils invested in the transmitting system through timing to reduce the system turn-off delay, scheme II can make the bridge MOSFET and the transmitting coil work synchronously, which can theoretically make the transmitting current turn off instantly. Finally, the circuits of the two schemes are built based on Simulink, and the simulation results show that both schemes can realize the microsecond level turn-off time and achieve the ideal expectation.
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