Patent ID: 9013163
Filing Date: 2015-04-21
Classification: H02M,Y02B

Abstract:
1. A method to detect a threshold for entering and leaving a Continuous Current Modulation (CCM) mode of a buck converter comprising the following steps: (1) providing a buck converter comprising a DC voltage source, a coil, a means to measure continuously an output current of said voltage source, a filter, a comparator, a controller for CCM/DCM mode controlling a high side switch and a low side switch; (2) measuring continuously total output current of the DC voltage source, which is also a total input current of the buck converter; (3) filtering the total input current measurement and comparing subsequently the filtered measurement to a threshold, wherein the filtering is performed by a low-pass filter with a cut-off frequency below the switching frequency of the buck converter; (4) checking if the buck converter is in continuous current mode and, if true, go to step 5, else go to step 7; (5) checking if the filtered total output current measurement of the DC voltage source is lower than a threshold I (6) switch buck converter to DCM mode and go to step 7; (7) checking if the filtered total output current measurement of the DC voltage source has reached a threshold I (8) switch buck converter to CCM mode and go to step 5.