Method and apparatus for a control circuit responsive to an...

Details Method and apparatus for a control circuit responsive to an... Method and apparatus for a control circuit responsive to an...

2011-08-23

2011-08-23

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S056110, C363S021130

Reexamination Certificate

active

08004864

ABSTRACT:
An example power supply includes a controller and a detection circuit. The controller includes a sense terminal coupled to provide a sense terminal current representative of an input voltage of the power supply during normal operation. The detection circuit is external to the controller and is coupled to the sense terminal. The detection circuit includes a Zener diode coupled to conduct a current to adjust the sense terminal current during a fault condition, where during the fault condition the controller is responsive to a measured impedance of the detection circuit which is determined in response to the sense terminal current.

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