BOOST CONVERTER WITH SHORT-CIRCUIT PROTECTION AND METHOD THEREOF

摘要

A short-circuit protection method for a boost converter is disclosed. In this method, a switch of a switching circuit of the boost converter is turned on and a control voltage with a gradually increasing magnitude is supplied to control a short-circuit protection switch coupled between an input voltage and the switching circuit when the boost converter starts up. Then, a current flowing through the switch is detected and compared with a predetermined value. The switch is turned off and a preset time period is initiated if the current is higher than the predetermined value. It is detected whether a short-circuit event occurs at an output terminal of the boost converter at the end of the preset time period. If the short-circuit event occurs, the short-circuit protection switch is then turned off.

主权项

1. A short-circuit protection method for a boost converter comprising a short-circuit protection switch and a switching circuit, wherein the short-circuit protection switch is coupled between an input voltage and the switching circuit, and wherein the switching circuit has a switch and is configured to provide an output voltage at an output terminal based on the input voltage, the short-circuit protection method comprises:
turning on the switch and supplying a control voltage to gradually turn on the short-circuit protection switch when the boost converter starts up; detecting whether a current flowing through the switch is higher than a predetermined value; turning off the switch and starting timing when the current flowing through the switch is higher than the predetermined value; detecting whether the output terminal of the boost converter is shorted to a reference ground after a preset time period; and turning off the short-circuit protection switch when the output terminal of the boost converter is shorted to the reference ground.