POWER SUPPLY DEVICE

• Main Authors: OZAKI MASAHITO, NAGATA SHOJI, ISHIKAWA NAOKI, WATANABE TADAAKI, KATO SHINJI, SAITO KIMIO, MATSUMURA MITSUYORI
• Format: Patent
• Language: English
• Published: 14.10.2010
• 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; BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To properly prevent a high voltage system from resulting in an overvoltage. SOLUTION: When an electric capacity SOC of a slave battery is equal to or lower than a predetermined electric capacity SOCRef (S100), a slave-side step-up/down converter is controlled by switching so that the slave battery is charged along with switching of usual frequency of a transistor (S110). When the electric capacity SOC is larger than the predetermined electric capacity SOCRef, the slave-side step-up/down converter is controlled by switching so that the slave battery is charged by a charging amount smaller than a charging amount for control when the electric capacity SOC is equal to or less than a predetermined electric capacity SOCRef in such a way that the electric capacity of the slave battery does not exceed a permissible electric capacity along with switching of frequency higher than the usual frequency of transistor (S120). Thereby, the high voltage system at the high voltage side can be prevented more properly from resulting in an overvoltage. COPYRIGHT: (C)2011,JPO&INPIT