Patent ID: 7973519
Filing Date: 2011-07-05
Classification: H02M

Abstract:
1. A device for transforming a primary AC voltage to a lower AC voltage for supplying an electric load, the device comprising: a generator to generate at least one PWM control signal; a first bidirectional switch to couple the electric load and the primary AC voltage during a conduction phase; a second bidirectional switch to discharge energy from the electric load during an off phase of said first bidirectional switch; a first driving circuit for said first bidirectional switch to be input with the at least one PWM control signal and to generate a first PWM signal to be applied between a control terminal and a conduction terminal of said first bidirectional switch; a second driving circuit for said second bidirectional switch input with the at least one PWM control signal and to generate a second PWM signal, in phase opposition with respect to the first PWM signal, to be applied between a control terminal and a conduction terminal of said second bidirectional switch; an electric decoupling circuit between said generator and said second driving circuit; and an electric decoupling and magnetic coupling transformer between respective conduction terminals of said first and second bidirectional switches.