The paper presents and provide simulation model results of a method for wireless power transfer by harvesting and/or transferring the switching ripple energy of the inductor current in a switching power converter. By placing a planar coil as a wireless power receiver (Rx) in the proximity of a power inductor of a power converter, wireless power can be received by the Rx coil because of the oscillating magnetic field generated by AC switching ripple of the inductor current. This yields a power converter with a wireless power transmitter (Tx) in addition to the original wired output of the power converter, therefore, eliminating the need for Tx side in an inductive wireless power transfer system. Using an example Buck-WPT system, which achieves step down power conversion for a wired output and WPT at the same time, this paper discusses the related operation principle and provide simulation model results.