Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Reexamination Certificate
2008-12-29
2011-11-08
Fureman, Jared (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
Reexamination Certificate
active
08054600
ABSTRACT:
A switching power supply device includes: a switching element connected through a primary winding of a transformer to an output end of an input rectifying/smoothing circuit that rectifies and smoothes an alternating current input voltage and outputs a direct current input voltage; an output rectifying/smoothing circuit that rectifies and smoothes a voltage induced in a secondary winding of the transformer and outputs a direct current output voltage; and a control circuit that controls ON and OFF of the switching element. The control circuit includes an overvoltage protection circuit that detects a voltage corresponding to the direct current output voltage and a voltage corresponding to the alternating current input voltage, outputs an overvoltage operation prohibition signal for prohibiting ON and OFF operations of the switching element when the voltage corresponding to the direct current output voltage rises to a first threshold value or more, and releases the overvoltage operation prohibition signal when the alternating current input voltage drops and the voltage corresponding to the alternating current input voltage falls down below a second threshold value.
REFERENCES:
patent: 5784231 (1998-07-01), Majid et al.
patent: 2007/0217234 (2007-09-01), Nakamura
patent: 2008/0175027 (2008-07-01), Shimada et al.
patent: 2007-267501 (2007-10-01), None
U.S. Appl. No. 12/212,285, filed Sep. 17, 2008, Nakamura.
Fureman Jared
Ieva Nicholas
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sanken Electric Co. Ltd.
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