公开(公告)号：US20130188407A1

公开(公告)日：2013-07-25

申请号：US13713236

申请日：2012-12-13

申请人： Emeric Uguen ,  Thibault Perquis

发明人： Emeric Uguen ,  Thibault Perquis

IPC分类号： H02M7/04

CPC分类号： H02M7/04 ,  H02M1/4258 ,  H05B33/0815 ,  Y02B20/346 ,  Y02B70/126

摘要： A method of controlling a switched mode converter is disclosed in which the switching frequency varies in proportion to the square of the sine of the phase of the input AC supply. Thus the switching frequency is a maximum, and the respective on period of the switch is a minimum, when the mains voltage is a maximum. Conversely, the switching frequency is reduced, and the respective on time of the switch is increased, when the mains voltage is reduced. Such a switching method provides for a high power factor. Implementation by means of a phase locked loop and a comparator may prevent the need for complex circuitry, and may provide for direct use of a digital controller or digital signal processing through a counter output in the phase locked loop.A controller configured to operate such a method, together with an AC/DC converter embodying such a controller are also disclosed.