Patent ID: 7248027
Filing Date: 2007-07-24
Classification: H02M

Abstract:
1. A method for regulating an output voltage of a power converter, the method comprising intermittently coupling an input power source to provide a current flow to generate the output voltage, wherein in consecutive time cycles T1, T2, . . . Tn, . . . the input power source is coupled for respective time durations Tp≧0 where Tp=Tp(T1), Tp(T2), . . . Tp(Tn), . . . in respective cycles T1, T2, . . . Tn, . . . , the method further comprising determining the durations Tp, wherein determining Tp comprises: (1) obtaining a cycle skip count representing a number of cycles with Tp=0 between cycles with Tp>0; (2) for at least one cycle Ti for which Tp(Ti)>0, determining whether or not a condition 1 holds true, wherein the condition 1 is either (i) a condition that Tp(Ti) is below a predetermined value TLOW, or (ii) a condition that Tp(Ti) is less than or equal to TLOW, or (iii) a condition that a predefined increasing function of Tp(Ti) is below TLOW, or (iv) a condition that said increasing function of Tp(Ti) is less than or equal to TLOW; (3) if the condition 1 holds true, then: