LED LIGHT BAR NETWORK CURRENT FOLDBACK CIRCUIT, DRIVING POWER SUPPLY AND TV SET

摘要

An LED light bar network current foldback circuit, a driving power supply, and a TV set. The LED light bar network current foldback circuit (10) comprises: a reference voltage module (11), a voltage division and sampling module (12) and a comparison module (13). A power supply voltage passes through the reference voltage module (11) to generate a reference voltage, and the reference voltage is output to the voltage division and sampling module (12) and the comparison module (13); the voltage division and sampling module (12) performs voltage division on the reference voltage, and outputs the reference voltage to the comparison module (13); the comparison module (13) further receives a detection voltage obtained after a detection current of the LED light bars is converted, and compares the detection voltage with the reference voltage; and when the detection voltage is greater than the reference voltage, the comparison module outputs a driving stop command to control the LED light bars to stop working. The LED light bar network current foldback circuit can control the driving circuit to stop working after the current of LED light bars, that is, a constant output current, is increased abnormally, thus effectively protecting the LED light bars, and avoiding high screen body maintenance cost caused by damage of the LED light bars.