Solid-state lighting control with dimmability and color temperature tunability using low voltage controller

A dimming and correlated color temperature (CCT) tuning lighting system, comprising:

• a low voltage dimming input;
• a low voltage CCT tuning input;
• a dimming and CCT tuning control circuit configured to receive and to mix a dimming signal and a CCT tuning signal from the low voltage dimming input and the low voltage CCT tuning input and to generate at least two pulse-width modulated (PWM) control signals;
• and
• at least one LED-based lighting device, comprising:
• at least two types of LED-based light sources;
• and
• a dimming and CCT tuning controllable driver, comprising:
• a power supply section configured to receive an alternating current (AC) power to generate a direct current (DC) power;
• and
• an LED driving section connected to the power supply section and configured to receive the DC power and the at least two PWM control signals from the dimming and CCT tuning control circuit to drive the at least two types of LED-based light sources to emit a light with a dimming level and a CCT,
• wherein, in response to the dimming signal and CCT tuning signal from the low voltage dimming input and the low voltage CCT tuning input, the dimming and CCT tuning control section performing operations comprising:
• determining a ratio related to extreme CCTs of the LED-based light sources from the low voltage CCT tuning input and the dimming level from the low voltage dimming input;
• integrating the ratio related to the extreme CCTs of the LED-based light sources with the dimming level to obtain factors relevant to a target dimming level and CCT;
• and
• generating PWM signals based on the factors relevant to the target dimming level and CCT.