A High Efficiency Current-Fed High Step-up ICPT System

In contrast to high-voltage (HV) input to HV output configurations, the key challenge in designing low-voltage (LV) input to HV output high-power inductive coupled power transfer (ICPT) systems is the high voltage boost ratio. This not only results in the difficulties in designing the compensation parameters and loosely coupled transformer, but also leads to high conduction losses in the transmitter coil. To address these issues, this paper breaks away from the conventional voltage?fed approach and proposes a novel ICPT topology by incorporating an Inverse Coupled Current Doubler Inverter (ICCDI) and a voltage?doubler rectifier. The proposed topology not only provides higher the voltage step-up capability, but also eliminates the series diodes in traditional current?fed inverters. Thus, the conduction losses and the design difficulties of both the loosely coupled transformer and compensation parameters can be effectively reduced. To validate the advancement of the proposed scheme, a prototype with 28V input, 280V/5A output (1.4?kW), 50mm air gap is built and tested in the laboratory. Experimental results show that the proposed solution achieves nearly constant 280V output, with full?load efficiency and peak efficiency reaching 91.81?% and 95.25?%, respectively, confirming the validity and advancement of the research and design.