Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2007-08-27
2011-10-11
Riley, Shawn (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021150
Reexamination Certificate
active
08035999
ABSTRACT:
An isolating self-oscillation flyback converter includes a coupling transformer T1, a FET TR1, a transistor TR2, a photoelectric coupling isolator OC1and a load feedback circuit Adj. The common polarity terminal of a feedback winding Nfb of the coupling transformer T1is connected to the gate of the FET TR1via a capacitance C1and a resistance R2, and connected to the base of the transistor TR2via a capacitance C2. The base of the transistor TR2is also connected to the emitter of the photoelectric coupling isolator OC1. The photoelectric coupling isolator OC1is connected to the positive terminal of the output voltage. The opposite polarity terminal of the feedback winding Nfb is connected to the collector of the photoelectric coupling isolator OC1via a resistance R5, and connected to ground via a capacitance C5. The common polarity terminal of the feedback winding Nfb is also connected to the cathode of a diode D, and the anode of the diode D is connected to ground. A set of windings are removed by forming a loop circuit directly between the feedback winding Nfb and the photoelectric coupling isolator OC1.
REFERENCES:
patent: 4573112 (1986-02-01), Numata et al.
patent: 6525948 (2003-02-01), Hsu
patent: 7881077 (2011-02-01), Hsu
Huang Jiangjian
Song Jianfeng
Mornsun Guangzhou Science & Technology Limited
Riley Shawn
Wang George G.
Wilkinson & Grist
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