SELF-EXCITED OSCILLATION SWITCHING POWDER SUPPLY

PROBLEM TO BE SOLVED: To provide a self-excited oscillation power supply wherein its efficiency is prevented from decreasing by the increase of its oscillation frequency with such a small load as in stand-by, even when its output power is changed by its load over a relatively wide renge. SOLUTION: I...

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Bibliographic Details
Main Authors OKAMURA TAKAHARU, NISHIDA AKIO, NAKAHIRA KOJI, TANI RYUTA
Format Patent
LanguageEnglish
Published 27.08.1999
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:PROBLEM TO BE SOLVED: To provide a self-excited oscillation power supply wherein its efficiency is prevented from decreasing by the increase of its oscillation frequency with such a small load as in stand-by, even when its output power is changed by its load over a relatively wide renge. SOLUTION: In a feedback winding NB, there is provided and oscillation- frequency control circuit including a capacitor C41 charged by the electromotive force of the feedback winding NB. When a phototransistor PT2 is brought into OFF-state by an external remote signal, the oscillation-frequency control circuit controls a control transistor Q3 to prolong the OFF-time of the self-excited oscillation period of a switching transistor Q1. Thereby, reducing the switching frequency of the switching transistor Q1 of a switching power supply in stand-by, its power loss can be reduced in stand-by, and operating it by the external remote signal as an original RCC mode switching power supply unit in its stationary state, its voltage can be generated responding to a load over a wide range.
Bibliography:Application Number: JP19980027037