CONTROLLING MULTIPLE GROUPS OF LEDS

The described invention provides a method of and circuitry for driving three or more groups of light emitting diodes (LEDs) using time division multiplexing, whereby a periodic signal is divided among groups of LEDs, each with a different color or color temperature. The LEDs may be driven to produce colors along a desired path of values. Other qualities of light besides color or color temperature may be similarly controlled along a path of values. In some implementations, the system may receive an oscillating signal, which may be used as a periodic signal for comparison with the control signal, and one or more offset voltages, each of which may be combined with the oscillating signal to provide a second oscillating signal. The control signal may be compared to both of the oscillating signals to determine if a particular LED group may be powered.