Over-current protection circuit, LED backlight driving circuit and liquid crystal device

摘要

An over-current protection circuit includes a boost circuit, a voltage control module and an over-current protection module. The boost circuit boosts an input direct current (DC) voltage to a boosted DC voltage and for providing the boosted DC voltage to a load. The voltage control module controls the boost circuit to provide the boosted DC voltage to the load such that the load is driven by a constant current. The over-current protection module generates first control signals or second control signals according to an over-current protection voltage detected by the boost circuit. The first control signals are for controlling the voltage control module to operate normally, and the second control signals are for stopping operations of the voltage control module. In addition, the LED backlight driving circuit and the liquid crystal device incorporating the above over-current protection circuit are also disclosed.