Driving a multi-color luminaire

Embodiments are disclosed for driving a multi-color solid state light source luminaire so as to maintain a color point as temperature varies within a given range. An array of solid state light sources includes two or more strings and is driven by a single constant current source. The array is topologically arranged to allow for control of the division of current between the strings of solid state light sources. In one such current-sharing scenario, the duty cycle of a switching control signal corresponds directly to the proportion of current that flows in one of two distinct strings of solid state light sources. Thermal feedback is used to control the duty cycle. In this way, the amount of current that flows in both strings may be adjusted as temperature changes. 公开了用于驱动多色彩固态光源泛光灯从而随着温度变化而将色彩点保持在给定范围内的实施例。固态光源阵列包括两个或更多个串，并且由单个恒定电流源驱动。所述阵列在拓扑上被布置为：允许控制所述各固态光源串之间的电流的划分。在个这样的电流共享情形中，开关控制信号的占空比直接对应于在两个不同的固态光源串中的个中流动的电流的比例。热反馈被用于控制所述占空比。以此方式，可以随着温度改变而调整在两个串中流动的电流的量。