DC/DC POWER CONVERTER

• Main Authors: URAKABE, TAKAHIRO, OKUDA, TATSUYA, MAEKAWA, HIROTOSHI, KOBAYASHI, MASARU, IKEDA, MATAHIKO, TANAKA, YUUYA
• Format: Patent
• Language: English; French; German
• Published: 08.08.2012
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

An object of the present invention is to provide a DC/DC power conversion apparatus that can reduce the average power consumption over a wide range of DC voltage ratios. A control circuit (120) changes a switching frequency f at which IGBTs S1 to S4 perform ON/OFF operation, in accordance with a voltage ratio k (k = V2/V1) for DC voltage conversion, based on the following expressions, such that a magnitude ”I of a current ripple flowing in a reactor Lc is a predetermined constant value irrespective of the voltage ratio k. If 1 ‰¤ k < 2 : f = V ¢ 1 / 2 × L × ”I × k - 1 × 2 - k / k If k < 2 : f = V ¢ 1 / 2 × L × ”I × k - 2 / k