Anti-afterglow circuit of non-isolated LED driving power supply

The invention provides an afterglow removing circuit of a non-isolated LED driving power supply, and the circuit comprises a rectifying and filtering circuit which carries out the rectification and filtering of the voltage of an input end; the booster circuit is used for boosting the rectified and filtered voltage; and the Buck circuit is used for reducing the boosted voltage and is connected with the LED lamp panel. According to the scheme, a PFC + BUCK topology is adopted, a rectifier bridge BD1 and a filter capacitor C1 form an alternating current rectifier filter circuit, an inductor L1, an MOS tube Q1, a diode D1 and a capacitor C2 form a BOOST circuit, and a component K1, an MOS tube Q2, an inductor L2, an inductor LF1, a resistor R1, a capacitor C3, an MOS tube Q3 and a component K2 form a BUCK circuit. When the lamp is turned off, a CTRL2 control signal corresponding to the control signal 1 and a CRTL3 control signal corresponding to the control signal 2 can turn off the MOS tube Q2 and the MOS tube Q