Patent ID: 7408790
Filing Date: 2008-08-05
Classification: H02M,Y02B

Abstract:
1. A switched mode power supply having input terminals for receiving electric power and output terminals for delivering output power having an output voltage and an output current; wherein said input terminals are separated from said output terminals by an insulation barrier adapted to electrically insulate said input terminals from said output terminals so that said input terminals are provided on a primary side of the insulation barrier and said output terminals are provided on a secondary side of the insulation barrier; said switched mode power supply comprising: a converter stage coupled between the input terminals and the output terminals, said converter stage having at least one controllable first switching element for generating a converter stage duty cycle so as to cause said converter stage to generate said output power; a pre-regulator coupled between the input terminals and the converter stage, the pre-regulator including a second switching element; and a programmable digital circuit; the switched mode power supply being characterized in that the programmable digital circuit is located on the primary side of the insulation barrier; the programmable digital circuit is arranged to control said first switching element in dependence of at least one signal obtained on said primary side of the insulation barrier; and the programmable digital circuit is further arranged to control said second switching element.