Patent ID: 9642198
Date: 2017-05-02
CPC Classifications: H05B

Claim:
1. An LED driver circuit for providing three-way lighting control to an LED lamp to produce light at one of a low level, a medium level, and a high level, the LED driver circuit comprising: a rectifier circuit comprising a first input terminal coupled to a first AC voltage line and a second input terminal coupled to a second AC voltage line, wherein the rectifier circuit converts a first AC voltage on the first AC voltage line and a second AC voltage on the second AC voltage line to a DC voltage and the first AC voltage line and the second AC voltage line are both selectively controlled to be either on or off to provide the three-way lighting control to the LED lamp; an integrated floating circuit having a floating ground that switches between a ground and a second voltage level, the integrated floating circuit coupled to the first AC voltage line and to the second AC voltage line and generating a reference AC voltage based on the first AC voltage line and the second AC voltage line being on or off, wherein the reference voltage corresponds to one of the low level, the medium level, and the high level of light produced by the LED lamp, and wherein the integrated floating circuit provides a current to the LED lamp based on the generated AC reference voltage; a first diode connected to the first AC voltage line and the integrated floating circuit; and a second diode connected to the second AC voltage line and the integrated floating circuit, wherein if the first AC voltage line and the second AC voltage line are conducting and the floating ground is at the ground, then the first diode and the second diode are conducting and the floating integrated circuit generates the AC reference voltage at the low level.