Patent ID: 9748858
Date: 2017-08-29
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A driver circuit comprising: a controller circuit; a boost switch circuit coupled to the controller circuit; a buck switch circuit coupled to the controller circuit; and a feedback circuit coupled to a light source and configured to provide a feedback signal to the controller circuit representative of a DC output of the driver circuit; wherein the controller circuit is configured to control the boost switch circuit and the buck switch circuit in response to the feedback signal to regulate current to the light source using a boost converter configuration when the DC output is less than a rectified AC voltage coupled to the driver circuit at an input node, and to regulate current to the light source using a buck converter configuration when the DC output is greater than the rectified AC voltage at the input node; and wherein the boost converter configuration comprises: wherein the boost switch circuit is coupled to a node between the inductor and the first diode and the capacitor is coupled between the first diode and ground.