A resonant power supply, comprising: a resonant power stage configured to output a voltage; a boost converter circuit comprising a boost switch; a sense resistor (Rsense) configured to sense a current in the boost converter circuit; and a current sense processor configured to sense a voltage across the sense resistor, reconstruct the sensed voltage to eliminate disturbances in the voltage across the sense resistor, and generate, based on the reconstructed voltage signal, a signal as a representation of a momentary current in the boost converter circuit; a control block configured to compare the signal representing the momentary current with a reference current in order to furnish a switch conduction interval for the boost switch; wherein the current sense processor includes a reconstruction apparatus that is configured tc input the sensed voltage having disturbances and output the reconstructed voltage signal free of disturbances, wherein the sensed voltage and reconstructed voltage signal have the same amplitude and the same frequency; and wherein the reconstruction apparatus is: configured to take a derivative of the sensed voltage and a derivative of the reconstructed voltage and determine a difference therebetween, wherein the difference provides a first error signal; and configured to take the sensed voltage and the reconstructed voltage and determine a difference therebetween, wherein the difference provides a second error signal; and configured to feed back the first error signal and the second error signal and to integrate a sum of the first error signal and of the second error signal to update the reconstructed voltage. a resonant power stage configured to output a voltage; a boost converter circuit comprising a boost switch; a sense resistor (Rsense) configured to sense a current in the boost converter circuit; and a current sense processor configured to sense a voltage across the sense resistor, reconstruct the sensed voltage to eliminate disturbances in the voltage across the sense resistor, and generate, based on the reconstructed voltage signal, a signal as a representation of a momentary current in the boost converter circuit; a control block configured to compare the signal representing the momentary current with a reference current in order to furnish a switch conduction interval for the boost switch; wherein the current sense processor includes a reconstruction apparatus that is configured tc input the sensed voltage having disturbances and output the reconstructed voltage signal free of disturbances, wherein the sensed voltage and reconstructed voltage signal have the same amplitude and the same frequency; and wherein the reconstruction apparatus is: configured to take a derivative of the sensed voltage and a derivative of the reconstructed voltage and determine a difference therebetween, wherein the difference provides a first error signal; and configured to take the sensed voltage and the reconstructed voltage and determine a difference therebetween, wherein the difference provides a second error signal; and configured to feed back the first error signal and the second error signal and to integrate a sum of the first error signal and of the second error signal to update the reconstructed voltage. configured to take a derivative of the sensed voltage and a derivative of the reconstructed voltage and determine a difference therebetween, wherein the difference provides a first error signal; and configured to take the sensed voltage and the reconstructed voltage and determine a difference therebetween, wherein the difference provides a second error signal; and configured to feed back the first error signal and the second error signal and to integrate a sum of the first error signal and of the second error signal to update the reconstructed voltage.