Patent ID: 6137272
Filing Date: 2000-10-24
Classification: H02M,Y02B

Abstract:
A method for operating a converter which provides a DC output by temporarily charging an output capacitor with a current, said current being rectified from an AC input, said current having consecutively a minimum magnitude at first and second time points, said method comprising the steps of:determining a change of said output during a monitoring interval which starts at or after said first time point and which stops before said second time point;comparing said change to a threshold difference, the threshold difference being defined as a fraction of the difference of a maximum value and a minimum value of said output, and said fraction being defined by a ratio between the monitoring interval and the interval between said first and second time points; andaltering the current immediately after determining said change in case of a first magnitude relation between the change and the threshold difference, or altering the current at said second time point in case of a second magnitude relation between the change and the threshold difference, and said first magnitude relation applying when said change is larger than said threshold difference, and said second magnitude relation applying when said change is smaller than or equal to said threshold difference.