Patent ID: 8581518
Filing Date: 2013-11-12
Classification: H05B

Abstract:
1. A switching mode power supply, comprising: a triac dimmer, wherein the triac dimmer configured to receive an AC input signal and to modify the AC input signal with a target phase angle to generate a shaped AC signal; a rectifier coupled to the triac dimmer to receive the shaped AC signal, the rectifier being configured to generate a rectified signal based on the shaped AC signal; a filter coupled to the rectifier, the filter being configured to receive the rectified signal and generate a filtered signal; a DC/DC converter coupled to the filter to receive the filtered signal, and wherein the DC/DC converter is configured to provide power to a load; a dimming signal generator coupled to the rectifier to receive the rectified signal, the dimming signal generator being configured to generate a dimming signal based on the rectified signal; a feedback circuit coupled to the DC/DC converter to generate a feedback signal indicative of the power provided to the load by the DC/DC converter; and a PFC controller having a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, and an output terminal, wherein: