Abstract: Marine controlled source electromagnetic transmitter is a central device for transient electromagnetic method. An electromagnetic transmitter with topology of full-bridge DC converter is designed in this paper. Based on the switching element average model and the law of energy conservation, an averaging large signal non-ideal model and an AC small signal non-ideal model were proposed in order to design a marine controlled source electromagnetic transmitter with full-bridge DC converter as topology. Simultaneously, the design method of peak current control for the transmitter was obtained. The detailed theoretical analysis for equivalent power level transfer function and closed-loop output impedance of the proposed non-ideal model was presented. Finally, the correctness and superiority of the proposed model were further verified by the experimental results.