Microwave household or commercial appliance

A household or commercial appliance (1, 101) comprising:

• a heating chamber (7) designed to accommodate a product to be heated,
• at least a couple of magnetrons (8a)(8b) having relative anodes (TA1)(TA2) and cathodes (TC1)(TC2) and being configured to generate and irradiate electromagnetic radiation in the heating chamber (7),
• at least a power unit (5, 40, 140) comprising at least a high voltage circuit (9) configured to power-on said magnetrons (8a)(8b),
• wherein
• said high voltage circuit (9) comprises:
• a high voltage transformer (13) comprising a primary winding (13a) connected to an alternating voltage source (17) and at least a secondary high-voltage winding (13b) providing an alternating high voltage (V2) having a period (W) comprising two half periods (W1)(W2),
• at least a couple of half-wave voltage doubler circuits (15)(16) which are configured to cooperate with said secondary high-voltage winding (13b) in order to provide a doubled high-voltage (DVH),
• at least a first and second unidirectional conducting devices (31)(32) which are connected respectively between said half-wave voltage doubler circuits (15)(16) and a reference terminal (30)(33) having a predetermined potential (GND), said first and second unidirectional conducting devices (31)(32) being configured to cause said half-wave voltage doubler circuits (15)(16) to supply, during at least a period (W) of said alternating high-voltage (V2), said doubled high-voltage (DVH) to the cathode (TC1)(TC2) of the respective magnetron (8a)(8b) alternately, one of said half-wave voltage doubler circuits (15) supplying said doubled high-voltage (DVH) during one of said half periods (W1) of said alternating high-voltage (V2), and the other half-wave voltage doubler circuit (16) supplying said doubled high-voltage (DVH) during the other half-period (W2) of said alternating voltage (V2).