LED lighting system with battery for demand management and emergency lighting
摘要
說明書
We next address a state where all AC mains power is directed to charging the energy storage device 3108, 3208 and no AC mains or energy storage device 3108, 3208 power is used to light the one or more LEDs (State 1:2). Here, the master controller may direct the second controller 3012 to control the current regulator 3008 to stop drawing power from the bus 3060. It may instruct the first controller 3010 to continue generating the bus voltage, V3, at the same voltage as at a previous time, or at a higher or lower voltage. For instance, since power is not being sent to the current regulator 3008, increased bus voltage, V3, will not lead to increased waste in the current regulator 3008, but an increased bus voltage, V3, may allow faster charging or an increased charge to be placed on the energy storage device 3108, 3208. Such a situation may arise, where the one or more LEDs do not need to be lit throughout the day, and where electricity costs are lower during periods when the one or more LEDs need not be lit. Accordingly, the energy storage device 3108, 3208 can be charged during periods when electricity prices are lower. Further, the rate of charging may be increased in order to maximize the amount of charging that can occur during a limited window of low electricity prices. The master controller can instruct the controller 3714 to have the step up converter 3172, or the controller 3274 to have the converter 3276 draw power from the bus 3060 and charge the energy storage device 3108, 3208. The master controller can instruct the controller 3174 to have step up converter 3172 or the controller 274 to have the converter 3276 upconvert or boost the bus voltage, V3, so as to charge the energy storage device 3108, 3208 faster or to a higher voltage, V2. The master controller can also instruct the controller 3174 to have the step up converter 3172 or controller 3274 to have the converter 3276 charge the energy storage device 3108, 3208 without conversion (i.e., at the bus voltage, V3). In some instances, the inputs and outputs of the step up converter 3172 and the step down converter 3170 can be reversed, and the master controller can instruct the controller 3174 to have the step down converter 3170 draw power from the bus 3060, and charge the energy storage device 3108 with or to a voltage, V2, lower than the bus voltage, V3. In some cases, the master controller may instruct the controller 3174 and hence the step up converter 3172, or the controller 3274 and hence the converter 3276, to draw more or less current, or more or less power, from the bus 3060 in order to charge the energy storage device 3108, 3208 according to different goals.
