Device and method for detecting a short-circuit during a start-up routine

摘要

A device and method for detecting a short circuit in an electrical component during a start-up routine. In an embodiment, a device may have a problematic display having a short circuit that may result in damage to other components of the device if the device were allowed to fully startup during a normal start-up routine. Thus, power supplied to the panel may be initiated in stages so as to monitor any current that may be flowing through the panel, which in turn, may be indicative of a short circuit in the panel. If enough “leakage” current is detected through the panel during this staged startup routine, then a short-circuit detection circuit may interrupt the startup routine and lock out the operation of the device until the detected short circuit in the panel can be addressed.

主权项

1. A device comprising:
a display having a first power node and a second power node; a power supply circuit having first and second supply nodes respectively coupled to the first and second power nodes and configured to generate a first ramped voltage signal on the first supply node during a first phase of a startup routine and generate a second ramped voltage signal on the second supply node during a second phase of the startup routine; and a detection circuit and a control unit cooperating therewith to
sense a current through the display during the first phase,responsive to sensing the current, disable the generation of the first ramped voltage signal by the power supply circuit, andresponsive to not detecting the current through the display, disable the detection circuit.