Patent ID: 6476665
Filing Date: 2002-11-05
Classification: G09G,H02M

Abstract:
A switched-mode power supply for periodically varying loads in consecutive cycles of a predetermined operation period, the switched-mode power supply comprising:converting means for converting an input voltage into an output voltage, control means for supplying a control signal to the converting means, the control means being arranged to generate a control signal depending on a change of the load level in consecutive cycles, characterized in that the control means comprises memory means for storing status information relating to a switching pattern of the converting means corresponding to the load level in consecutive cycles during the operation period, in that the control means are arranged to retrieve the status information corresponding to the load level of a cycle and determine the control signal in dependence on the retrieved status information. in that the switched-mode power supply comprises clock-generating means coupled to the control means for supplying a clock signal to the control means, and in that the control means comprises a counting means coupled to a circular memory means arranged to count the number of clock periods of the clock period during the running period, the control means being further arranged to derive the acquired status information derived from the counted number of clock periods.