Patent ID: 9585207
Date: 2017-02-28
CPC Classifications: H05B,Y02B

Claim:
1. A light emitting diode (LED) driver comprising: an inverter for converting a DC input signal to a pulsating signal; a multiple output multi-resonant converter for generating via a first multi-resonant converter output, a first LED string current in response to the pulsating signal, and for generating via a second multi-resonant converter output, a second LED string current in response to the pulsating signal; and at least one transistor selected from a field effect transistor (FET) and a bipolar junction transistor (BJT), wherein the at least one transistor is biased when activated to operate only in its linear region to regulate the second LED string current independent of the first LED string current, and further wherein an LED load on the first multi-resonant converter output imposes a substantially fixed voltage that enables a voltage on the second multi-resonant converter output to be independently regulated over a full load range, wherein the substantially fixed voltage is defined as an LED diode forward voltage drop plus an inherent resistive voltage drop in the LED diode.