Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Reexamination Certificate
2006-04-18
2006-04-18
Sircus, Brian (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
C361S018000
Reexamination Certificate
active
07031128
ABSTRACT:
A power circuit protection apparatus halting an operation of a pulse width modulation (PWM) controller when an abnormal state is generated due to an open or short in a secondary side winding of a transformer is provided. The apparatus includes: a transformer; an output unit which receives voltages output from the transformer, rectifies and smoothes the received voltage, and outputs the rectified and smoothed voltage; a PWM controller which receives the voltage output from the output unit and outputs a PWM signal with an adjusted duty cycle; a voltage sensing unit which senses voltages induced in the secondary side coils of the transformer; a blocking unit which blocks interference between sensed voltages and a first reference voltage; and a comparison unit which compares a variation value of the first reference voltage with respect to a second reference voltage and outputs a signal determining an on/off operation of the PWM controller.
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Kitov Zeev
Samsung Electronics Co,. Ltd.
Sircus Brian
Sughrue & Mion, PLLC
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