A power supply device for a household appliance comprising: - a switching converter that comprises a rectifying stage, electrically connected with the mains, a bus capacitor, electrically connected in parallel with output terminals of said rectifying stage, a resonant tank electrically connected with one terminal of said bus capacitor, and a switching device, electrically connected with said resonant tank and another terminal of the bus capacitor; - control means for controlling the operation of said switching device, said control means operating, in normal conditions, said switching device with a switching cycle that comprises a first switching period (T ON) in which said switching device is in a conduction state and allows the flow of a first current (Is) between said bus capacitor and said resonant tank, and a second switching period (T OFF), in which said switching device is in an interdiction state and blocks the flow of said first current (Is); wherein said control means are configured to: - determine the occurrence of an over-voltage event on the base of detection data or signals (D 1, S 1) indicative of the behaviour of a bus voltage (V DC) across the terminals (A, B) of said bus capacitor; - operate said switching device so as to bring or maintain a switch voltage (V CE) across output terminals (C, E) of said switching device within predefined safety limits, when the occurrence of an over-voltage event is determined; - operate said switching device so that said switching device commutates into said interdiction state, if said over-voltage event is determined to occur during a first portion of said first switching period (T ON); - operate said switching device so that said switching device maintains said interdiction state, until the rate of change of said bus voltage (V DC) or said bus voltage (V DC) is below a first safety value (V S1); - characterised in that said control means are further configured to: operate said switching device so that said switching device is subject to one or more sequences (BURST) of state commutations, if said over-voltage event is determined to occur during a second portion of said first switching period (T ON) or during said second switching period (T OFF), - wherein said state commutations of each sequences (BURST) have a duration (T BURST) that is shorter than the switching cycle. - a switching converter that comprises a rectifying stage, electrically connected with the mains, a bus capacitor, electrically connected in parallel with output terminals of said rectifying stage, a resonant tank electrically connected with one terminal of said bus capacitor, and a switching device, electrically connected with said resonant tank and another terminal of the bus capacitor; - control means for controlling the operation of said switching device, said control means operating, in normal conditions, said switching device with a switching cycle that comprises a first switching period (T ON) in which said switching device is in a conduction state and allows the flow of a first current (Is) between said bus capacitor and said resonant tank, and a second switching period (T OFF), in which said switching device is in an interdiction state and blocks the flow of said first current (Is); - determine the occurrence of an over-voltage event on the base of detection data or signals (D 1, S 1) indicative of the behaviour of a bus voltage (V DC) across the terminals (A, B) of said bus capacitor; - operate said switching device so as to bring or maintain a switch voltage (V CE) across output terminals (C, E) of said switching device within predefined safety limits, when the occurrence of an over-voltage event is determined; - operate said switching device so that said switching device commutates into said interdiction state, if said over-voltage event is determined to occur during a first portion of said first switching period (T ON); - operate said switching device so that said switching device maintains said interdiction state, until the rate of change of said bus voltage (V DC) or said bus voltage (V DC) is below a first safety value (V S1); - characterised in that said control means are further configured to: operate said switching device so that said switching device is subject to one or more sequences (BURST) of state commutations, if said over-voltage event is determined to occur during a second portion of said first switching period (T ON) or during said second switching period (T OFF), - wherein said state commutations of each sequences (BURST) have a duration (T BURST) that is shorter than the switching cycle.