Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2006-07-11
2006-07-11
Vu, Bao Q. (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021160, C363S021150
Reexamination Certificate
active
07075802
ABSTRACT:
A semiconductor device (51) for controlling a switching power supply, includes a switching element (1) and a switching control circuit. During an intermittent switching operation of the switching element (1), when a return signal is outputted from a light load detection circuit (32) before the counting of a counter circuit (14), the switching operation of the switching element (1) is restarted at the timing of a transformer reset signal from a transformer reset detection circuit (13) after the return signal is outputted. When the return signal is outputted from the light load detection circuit (32) after the counting of the counter circuit (14), the switching operation of the switching element (1) is restarted, regardless of the transformer reset signal, only when the return signal is outputted.
REFERENCES:
patent: 4626976 (1986-12-01), Abe et al.
patent: 6134123 (2000-10-01), Yamada
patent: 6320763 (2001-11-01), Hosotani
patent: 6469913 (2002-10-01), Hosotani et al.
patent: 6960906 (2005-11-01), Yamashita
patent: 2002315333 (2002-10-01), None
Matsushita Electric Industrial Co., Inc.
Steptoe & Johnson LLP
Vu Bao Q.
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