Patent ID: 7161814

Claim:
A DC-DC converter comprising: at least one switching element for converting intermittent DC input from a DC power source into electric power of high frequency by the on-off operation of the switching element, a rectifying smoother for converting the electric power of high frequency from the switching element into DC output to a load; an inductance element having a plurality of in-phase windings (N B , N A ) wound around a common magnetic core and respectively connected in positive and negative lines between the rectifying smoother and load to remove a common mode noise; a normal power source for generating a reference voltage to define a rated value of electric current flowing through the load; a comparator for comparing a detection voltage detected from both ends of one of the in-phase windings (N B , N A ) of the inductance element with the reference voltage from the normal power source to produce an error signal between the detection voltage and reference voltage; and a controller for controlling the on-off period of the switching element to adjust the electric current to the load in response to the error signal from the comparator.