| 摘要 |
599329 Disclosed is a solid state lighting driver circuit. The circuit includes an electromagnetic interference (EMI) filter, a rectifier, a power factor correction (PFC) stage, a buck regulator and a controller. The EMI filter is configured and arranged to receive an AC input from an AC power supply. The rectifier is connecting the EMI filter and configured and arranged to receive AC power from the EMI filter and produce a rectified current. The power factor correction (PFC) stage includes a boost circuit connected to the rectifier, the boost circuit being configured and arranged to receive the rectified current and to produce a power factor corrected output with a higher voltage than the AC input of the AC power supply. The buck regulator is configured and arranged to receive power from the PFC stage and regulate power for supply to a plurality of LEDs. The controller is configured and arranged to control the buck regulator and PFC stage for hysteretic PFC start-up. |
