Boosting converter, controller for boosting converter and short circuit protection method

The invention discloses a boosting converter, a controller for the boosting converter and a short circuit protection circuit; the boosting converter comprises a short circuit protection switch and a switch tube; when the boosting converter is started, the switch tube is conducted to provide a control voltage to the short circuit protection switch, so the short circuit protection switch is gradually conducted; whether the current flowing by the switch tube is larger than a preset value is judged, if the current is larger than the preset value, the switch tube is disconnected, and timing is performed at the same time; after the timing is performed for a certain period, whether the boosting converter is subjected to the output short circuit is detected, if the boosting converter is subjected to the output short circuit, the short circuit protection switch is disconnected, and protection is provided for the boosting converter.