An Injection Circuit Coupling Impedance Matching Converter and Its Compromised Control Method of Automobile-Based Electromagnetic Prospecting Transmitters for Energy Utilization Enhancement

Due to the extremely limited source capacity of the automobile-based electromagnetic prospecting transmitters, their energy utilization is very important. The impedance matching technology can raise energy utilization by solving the reactive power. However, the impedance matching technology under nonlinear square-wave voltages has seldom received attention. Until now, no paper has pointed out how to solve the contradiction between the ideal control objective and the dc voltage hardware limitation. Thus, this article focuses on energy utilization improvement through impedance matching, especially for nonlinear square-wave voltages. First, an injection circuit coupling impedance matching converter (ICMC) is proposed as the basement. Then, to deal with the above contradiction, a compromised weight gain is defined to describe the degree of compromise with dc voltage limitations. Third, the compromised matching reference current optimization calculation method can balance the dc voltage requirement and raise the signal-to-noise ratio. Fourth, a control method is proposed to realize the matching reference current. Finally, the comparative experimental hardware results show the ICMC realizes 31.0%– 65.5% larger current amplitude improvement with per-unit dc voltage compared to previous methods due to the optimized distribution of more capacity in the compensation for the frequency order with more serious SNR issues.