| 主权项 |
1. An overcurrent protection circuit for a light source driving module, the light source driving module comprising a power module, the power module comprising a switch and a detection resistor, a first end of the switch electrically connected to a first end of the detection resistor, a second end of the detection resistor electrically connected to ground, the overcurrent protection circuit comprising:
a peak value overcurrent protection module, for detecting a voltage at a node where the switch and the detection resistor are connected and generating a turning-off signal to turn off the switch when the voltage is larger or equal to a threshold voltage, wherein the voltage is formed by a current of the switch; and an average value overcurrent protection module, forming a logic AND with the peak value overcurrent protection module, for detecting an average voltage at the node and generating the turning-off signal to turn off the switch when the average voltage is larger or equal to a threshold average voltage, wherein the average voltage is formed h an average current of the switch, and the average voltage is an average value of the voltage within one or more switching periods. |
