METHOD OF COMPENSATING CURRENT OF PWM CONVERTER FOR ENVIRONMENTALLY-FRIENDLY VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide an offset compensation value for a current variation amount by an offset value in a delay time of a real current and detected current of a pulsatory current that is output as a chopping wave form from an inductor included in a DC-DC converter for an environmentally-friendly vehicle.SOLUTION: A method includes: determining whether a PWM signal for a switching DC-DC converter is on; comparing a delay time with a rise half cycle size or a descent half cycle size between a detected current and a real current that is output from an inductor; calculating a current variation amount and determining an offset correction value for correcting a current variation amount according to the result of comparing the rise half cycle size or the descent half cycle size with the delay time; and applying the offset correction value to compensate the detected current of the inductor.