<p>The issues of resistance to model uncertainties caused by changes in model parameters and other factors, as well as the challenge of control algorithm convergence time in wireless power transfer systems, are important concerns. The proposed solution to overcome such problems involves designing a robust controller based on sliding-mode control techniques, which is capable of dealing with any kind of uncertainties in the system’s mathematical model. However, in the process of controller design, a novel type of reaching law named “Fixed-time reaching law” is introduced, and thus, the time taken for the tracking error to reach the sliding surface is reduced considerably. In particular, the time required by the error dynamics to reach the surface will be finite irrespective of how much the initial conditions of tracking errors deviate from the sliding surface. In addition, the control law does not depend explicitly on the load resistance. This means that the controller is independent of the value of the load resistance, and hence, there is no need for load resistance measurement while implementing the controller. The stability of the proposed scheme in this study is proved using Lyapunov techniques. In this regard, to examine the performance of the proposed method, a series of practical tests was conducted in the laboratory on a WPT system, and the results confirmed that the proposed method is effective in the cases above.</p>