| 摘要 |
<p>The present invention is suitable for the field of light-emitting diode (LED) driving, and provided are a split LED lamp and a driving power supply insertion and extraction protection circuit thereof. In the present invention, when a driving power supply is not connected to an LED lamp board but is connected to an alternating current power supply, a voltage division module performs voltage reduction processing on the output voltage of a rectifier and filter circuit, and after the driving power supply is connected to the LED lamp board, a voltage detection module detects the voltage of a first end of a resistor R4 and correspondingly outputs a control level, so as to drive a voltage division control module to adjust the voltage of the voltage division direct current output by the voltage division module, so that the output level of a voltage comparison circuit is correspondingly adjusted, and then the feedback current of the driving power supply is controlled. Thus, a pulse width modulation (PWM) control circuit of the driving power supply performs constant current driving on the LED lamp board according to the feedback current, thereby guaranteeing that the service life of an LED will not be shortened due to overcurrent when the driving power supply is connected to the LED lamp board.</p> |
