Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2007-09-18
2007-09-18
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S017000, C363S026000, C363S041000
Reexamination Certificate
active
10558799
ABSTRACT:
To provide a switching power supply apparatus which can achieve the followings simultaneously in high levels: the voltage waveform capable of reducing switching noise to the least is in a sine-waveform; capable of providing an output of stable voltage without a control, and a simple response; and capable of corresponding to instantaneous peak current without having saturation of the core. It relates to an improvement of a resonance-type Royer converter with less switching noise as a base, which is directed to be used for audio equipment. A second inductor is inserted to the primary side inductor between a rectifier circuit and a smoothing means, which is coupled to the primary-side inductor in a same magnetic circuit in a direction of canceling a DC magnetic flux. Moreover, timing of the next cycle is determined by applying a center tap voltage of a transformer to a synchronous signal input terminal of a control IC. Thereby, a self-excited oscillating action is actually stabled. With this, high demands for use in audios can be satisfied simultaneously.
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Microfilm of the specification and drawings annexed to the request of Japanese Utility Model Application No. 41946/1979 (Laid Open No. 142054/1980); Sanyo Electric Co., Ltd.; Oct. 11, 1980; Entire document; cited in International Search Report; Copy of document not provided.
Fidelix Y.K.
Norris McLaughlin & Marcus PA
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