SWITCHING POWER SUPPLY DEVICE

PURPOSE:To improve efficiency by reducing the switching loss of a switching element at the time of small input voltage. CONSTITUTION:A capacitor C4 is charged gradually when a switching element Q1 is tuned off, and a transistor Q3 is turned on when the voltage of the capacitor C4 exceeds saturation...

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Bibliographic Details
Main Authors NAKAHIRA KOJI, TANI RYUTA
Format Patent
LanguageEnglish
Published 19.09.1995
Edition6
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
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Summary:PURPOSE:To improve efficiency by reducing the switching loss of a switching element at the time of small input voltage. CONSTITUTION:A capacitor C4 is charged gradually when a switching element Q1 is tuned off, and a transistor Q3 is turned on when the voltage of the capacitor C4 exceeds saturation voltage between the base and emitter of a transistor Q3. Consequently, the switching element Q1 is controlled in the direction that the off of the switching element Q1 is maintained. As a result, switching loss at the time of light load is reduced, thus improving efficiency. When load is to some extent weighted, the on period of the switching element Q1 is prolonged, a capacitor C6 is charged gradually, and a transistor Q8 is tuned on. Accordingly, the transistor Q3 is turned off, thus releasing the control action of a first control circuit 1.
Bibliography:Application Number: JP19940055101