the central processing unit current is greater than a reference current value and providing a power to the central processing unit via n number of phases based on a second switching frequency if the intensity of the central processing unit current is less than the reference current value application_number US 47042409 A description according to related researches most of the power loss wasted in the vrm is produced by the choke the power loss produced by the choke can be computed as follows p loss core 6 44 u00d7 10 3 u00d7 f sw 1 18 u00d7 b pk 2 27 u00d7 v b pk 1 2 u00d7 u03b4 b l u00d7 i lp u00d7 10 8 2 u00d7 a u00d7 n i lp v in u2212 v core u00d7 d u00d7 1 l u00d7 1 f sw where f sw stands for switching frequency of vrm v stands for voltage across choke u03b4b stands for flux density of choke l stands for inductance of choke a stands for cross section area of choke n stands for number of iron corn turns of choke d vcore vin stands for duty cycle of vrm according to the above equations the switching frequency f sw is inverse proportional to the ripple current i lp the ripple current i lp is proportional to the hysteresis loss b pk the hysteresis loss b pk is proportional to the power loss of the choke p loss core therefore the power loss of the choke p loss core can be reduced via increasing the switching frequency f.