Overload Protection Circuitry
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United States of America Patent
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Issued Date -
Feb 8, 2018
app pub date -
Aug 5, 2016
filing date -
Aug 5, 2016
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Abstract
A system for protecting a camera driver circuit from a static discharge during cable connection is disclosed comprises a supply node having a supply voltage for a driver circuit and a ground on a ground node for the driver circuit. A resistor network is configured to receive a voltage from the supply node and generate a sensed voltage that is related to the voltage on the supply node. An amplifier or comparator compares the sensed voltage to a threshold voltage, and if the sensed voltage is greater than the threshold voltage, generate a control signal. A variable resistor is configured to receive the control signal and responsive to the control signal, establish a conductive path, or vary a resistance of the conductive path, between the supply node and the ground node, thereby shunting current through the conductive path from the supply node to the ground node.
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