Modular coordinated lighting system
摘要
說明書
In embodiments, a processor or electrical circuit may provide a mechanism to reduce current through the LED light source when batteries capacity falls below a threshold to lessen the chance that the motion sensor would false trigger when LED light source is turned off. In cases where a motion sensor may be in the wireless lighting device, when the battery provides power to the LED light source, the battery voltage may drop significantly due to the high power consumption of the LED light source. When the motion sensor does not detect motion for some period of time the light source may turn off and the voltage level may increase significantly and quickly potentially causing the motion sensor to falsely trigger. In such a case, reducing the amount of power required by the LED light source may reduce the size of the voltage swing from light source on to light source off and reduce or eliminate the chance of a false trigger. By way of an example, an LED spotlight with a 2 W LED light source, a motion sensor and 3 D cell batteries may detect motion and turn the light source on. Prior to motion detected when the light source is off, the battery voltage may be measured at 4.0V. After the light source is turned on, the battery voltage may be measured at 3.4V. This is caused by the heavy load on the batteries pulling the battery voltage down to a lower voltage. After motion is not detected for some period of time, the light source is turned off and the battery voltage will return to 4.2V in a very short period of time (perhaps in the millisecond range). If upon detecting that the battery voltage has dipped below 4.1V, the processor that controls the current drawn by the LED light source may reduce the current draw by some amount. By way of an example, if the processor reduces the current draw by 50%, the battery voltage with the light source on may only be 3.7V thus reducing the voltage swing from light source on and light source off thus reducing or eliminating the chance that there will be false triggers from the motion sensor.
