Nowadays, marine electromagnetic method is a geophysical method which can effectively explore natural gas hydrate (NGH)\nresources. This method acquires seafloor structure and distribution laws of mineral resources by transmitting high-power\nelectromagnetic waves to the seafloor, and its detection depth relies on the intensity of transmitted electromagnetic waves. At\npresent, marine electromagnetic transmitter is not proper for transmission of high-power electromagnetic waves, and therefore, a\nnovel controlled-source circuit of soft switching three-level marine electromagnetic transmitter is proposed in this paper, one\nstep-down winding is added at the secondary side of high-frequency transformer in series connection with a linear inductor,\nasymmetric phase-shift PWM control is used, and soft switching of controlled-source circuit within the overall power range is\nrealized. A detailed analysis of the operation process and circuit characteristics is given, and finally, a prototype is designed.\nExperimental results indicate that this circuit is of wide ZVS range and high efficiency, and it meets requirements for deep-sea\ndetection of high-voltage power supply transmitter.
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