DC/DC POWER CONVERTER

摘要

Disclosed is a DC/DC power converter wherein mean power consumption can be reduced over a wide range of DC voltage ratios. A control circuit (120) changes a switching frequency (f) at which IGBTs (S1-S4) are turned ON/OFF in accordance with a voltage ratio (k) on the basis of the following equations, so that the magnitude (?I) of the current ripple flowing in a reactor (Lc) is a prescribed fixed value irrespective of the voltage ratio (k) (k = V2 / V1) of the DC voltage conversion. When 1 ? k 2: f = (V1 / (2 × L × ?I)) × (k - 2) / k