Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2007-04-24
2007-04-24
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
C361S093900
Reexamination Certificate
active
11012137
ABSTRACT:
A switching power supply apparatus produces an output voltage by smoothing a pulsating voltage obtained by switching an input direct-current voltage with a switching device. The switching power supply apparatus has a current detection circuit that outputs a detection current that varies in proportion to the switch current flowing through the switching device, an overcurrent detection circuit that detects an overcurrent by comparing the detection current with a set current previously set so as to correspond to the overcurrent detection level and that, on detection of an overcurrent, feeds a reset signal to a flip-flop for controlling the switching of the switching device to turn the switching device off, and a second current compensation circuit that superimposes a compensation current on the detection current fed to the overcurrent detection circuit to produce a compensated current.
REFERENCES:
patent: 11-332222 (1999-11-01), None
patent: 2000-32744 (2000-01-01), None
Kanamori Atsushi
Oki Kazufumi
Jackson Stephen W
Patel Dharti H.
Sharp Kabushiki Kaisha
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