POWER FACTOR CONTROLLER BASED SINGLE-STAGE FLYBACK DRIVER AND LIGHT-EMITTING SYSTEM

摘要

It is provided a power factor controller based single-stage flyback driver and a light-emitting system. The driver includes: a primary-side circuit including a primary winding; a secondary- side circuit including a secondary winding; a power factor controller; a current feedback circuit; a voltage feedback circuit; and a feedback signal generation circuit. In the secondary- side circuit, the output voltage is divided using a first voltage division resistor and a second voltage division resistor so as to provide the sampling of the output voltage to the voltage feedback circuit, and the first voltage division resistor or the second voltage division resistor is connected in parallel with a compensation branch having a capacitive reactance. By using the driver, overshoot at startup can be avoided.