Patent ID: 7973496

Claim:
A power supply device for supplying power to loads, the device comprising (a) two or more transformers, each having a primary side and a secondary side; (b) a first circuitry comprising: i. an inverter unit for providing an AC voltage, and ii. two or more resonant circuits connected parallel to each other, each resonant circuit comprising a capacitance, and an inductance and being connected to the primary side of the transformer; (c) a second circuitry comprising two or more branches, each branch comprising a rectifier unit, a switch, and a load and being connected to the secondary side of a single transformer of the two or more transformers such that said first and second circuitries are galvanically isolated, said switch being configured to switch said load on and off, and (d) a controller unit for controlling said switches of said second circuitry as to adjust the power provided to said loads without any measurement signal from said first circuitry.