Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2005-03-01
2005-03-01
Vu, Bao Q. (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S019000, C323S902000
Reexamination Certificate
active
06862193
ABSTRACT:
There is provided a power supply apparatus that can raise the power supply efficiency while an appliance in which the power supply apparatus is installed is in a standby state, with a simple construction, without performing complicated control, and can reliably achieve improved power consumption due to the raise in the power supply efficiency, as well as noise reduction. According to the power supply unit, Conduction and interruption of a current flowing in the primary winding103of the transformer T21is controlled. A voltage generated in the secondary winding104of the transformer T21is rectified and smoothed by the rectifier and smoothing circuit101.An output voltage of the rectifier and smoothing circuit101is compared with a reference voltage and a voltage corresponding to a difference between the output voltage and the reference voltage is outputted by error detection circuit102.An output from the error detection circuit102is transferred from the secondary side to primary side of the optocoupler PC21.An intermittent pulse signal is generated for forcibly reducing a signal level supplied to the optocoupler PC21for the period of the pulse being sufficient for stopping oscillation of the power supply apparatus irrespective of a result of the comparison of the error detection circuit102.
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patent: 2001-190066 (2001-07-01), None
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Vu Bao Q.
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