A novel active soft-switching converter is presented for an multi-transient electromagnetic method (MTEM) transmitter. The topology and operation principle of the MTEM transmitter are introduced in detail. Compared with the conventional converter, the proposed converter can operate in passive, single active and dual active soft-switching modes to achieve zero voltage switch over the entire load range, and the output power is greatly expanded. MTEM transmitter has the characteristics of large output-power, high-efficiency and strong-stability. The research has provided a solution for the development of other transmitters. At present, a 50kW prototype has been completed and achieves 1000V/50A output in the field.
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