SummaryThis article proposes an adaptive feedback regulation method for wireless power transfer (WPT) systems, which can be applied to solve the problem of the drop in input voltage from the emergency power supply such as a battery‐based source. The whole WPT system transfers power mainly through the mutual inductance between the transmitter and receiver coils. The compensation coils are accessed to form the power feedback side, which can achieve constant voltage output by adjusting the duty cycle of the DC/DC converter. Furthermore, the finite element simulation result analyzes the constant voltage output characteristics of the proposed topology under different load conditions. Finally, an 85 kHz prototype based on the proposed method is built and tested to verify the performance and effectiveness of the design. The proposed method achieves a constant 48 V output when the load varies from 60 to 120 Ω and the horizontal offset distance varies from 20 to 80 mm.