A resonant power converter configured to receive a varying input voltage at first and second input voltage terminals from an input voltage source (Vin) and to output an output voltage, the resonant power converter comprising: a. a transformer having a primary winding having a first end and a second end and a secondary winding, wherein the first end of the primary winding is connected to a first input voltage terminal to be coupled to the input voltage source (Vin), and wherein the secondary winding is coupled to an output (Vout) of the resonant power converter; b. a first switch comprising a first terminal and a second terminal, wherein the first terminal is coupled to the second end of the primary winding; c. a second switch coupled in series to the first switch, between the second terminal of the first switch and a second input voltage terminal; d. a first resonant tank coupled in series with a third switch, wherein the series coupled first resonant tank and third switch are coupled in parallel across the second switch; e. a second resonant tank coupled in series with a fourth switch, wherein the series coupled second resonant tank and fourth switch are coupled in parallel across the series coupled first switch and second switch; and f. a signal processing circuit coupled to the first input voltage terminal, to the first terminal of the first switch, and to the control terminal of each of the first switch, the second switch, the third switch, and the fourth switch, wherein the signal processing circuit is configured to sense the voltage of the input voltage supply (Vin) and the voltage at the first terminal of the first switch, and to selectively drive each of the first switch, the second switch, the third switch, and the fourth switch according to the sensed input voltage and first terminal voltage in such a way that if the voltage at the first terminal is greater or equal than a threshold value, then the third and fourth switches (Q3; Q4) are both turned OFF. a. a transformer having a primary winding having a first end and a second end and a secondary winding, wherein the first end of the primary winding is connected to a first input voltage terminal to be coupled to the input voltage source (Vin), and wherein the secondary winding is coupled to an output (Vout) of the resonant power converter; b. a first switch comprising a first terminal and a second terminal, wherein the first terminal is coupled to the second end of the primary winding; c. a second switch coupled in series to the first switch, between the second terminal of the first switch and a second input voltage terminal; d. a first resonant tank coupled in series with a third switch, wherein the series coupled first resonant tank and third switch are coupled in parallel across the second switch; e. a second resonant tank coupled in series with a fourth switch, wherein the series coupled second resonant tank and fourth switch are coupled in parallel across the series coupled first switch and second switch; and f. a signal processing circuit coupled to the first input voltage terminal, to the first terminal of the first switch, and to the control terminal of each of the first switch, the second switch, the third switch, and the fourth switch, wherein the signal processing circuit is configured to sense the voltage of the input voltage supply (Vin) and the voltage at the first terminal of the first switch, and to selectively drive each of the first switch, the second switch, the third switch, and the fourth switch according to the sensed input voltage and first terminal voltage in such a way that if the voltage at the first terminal is greater or equal than a threshold value, then the third and fourth switches (Q3; Q4) are both turned OFF.