Switching power supply unit

1. Field of the Invention An RCC type switching power supply unit with a transformer having a primary winding, a secondary winding, and a feedback winding, a main switching element receiving a feedback signal from the feedback winding and for turning on and off the current of the primary winding, a...

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Bibliographic Details
Main Authors Nishida, Akio, Tani, Ryota, Nakahira, Koji
Format Patent
LanguageEnglish
Published 04.03.2003
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Summary:1. Field of the Invention An RCC type switching power supply unit with a transformer having a primary winding, a secondary winding, and a feedback winding, a main switching element receiving a feedback signal from the feedback winding and for turning on and off the current of the primary winding, a rectifying and smoothing circuit having a rectifying element and a smoothing element connected to the secondary winding, and a control circuit connected between the feedback winding and the control terminal of the main switching element. A delay circuit by which the turning on of the main switching element is prohibited for a certain period of time after the current of the rectifying element has become zero and a switching circuit by which the delay time of the delay circuit is changed by two or more stages are provided.