A behavioral model of a two-stage average-current-mode-controlled PFC converter for dimmable MR16 LED lamps

MR16 LED retrofit lamps can be made compatible with legacy dimmers by using drivers that employ power factor correction (PFC) to imitate a resistive load, and detect the conduction angle for dimming control. One possible design is a two-stage switching converter, in which the first stage performs PFC as well as detecting the conduction angle, and the second stage drives the LED, which is dimmed in proportion to the detected conduction angle. In this work, we modeled a driver circuit for dimmable MR16 LED lamps and verified operation of the design with different conduction angles through simulation.