LED lighting is the mainstream of the global energy-saving, high power LED lighting is the main trend of the future world lighting illumination system. High-power LED with high brightness, energy saving and environmental protection, security, and stability characteristics, saving 60% to 70% than traditional light sources.
Traditional sound and light control delay controller can achieve a good control of the light in the dark light or temporary, can effectively to lights, go the lights out ", but because of its switch is the mechanical controller of the relay and the like, so the flow of people in many places due to frequent switching, more easily damaged.
According to the existing high-power led torch products on the market, designed intelligent lighting system that can be used in corridors, staircases, classrooms and other places.
The system uses 24 V / 3 A switching power supply, the lower the distribution of multi-channel intelligent LED lighting module (see Figure 1). The controller uses the AT89C2051, constant current drive PT4115 chip. The bright lights and brightness achieved through dimming and change.
PT4115 chip DIM pin can be used PWM dimming output current from 0-100%, according to this feature, designed a set of voice-activated light control, time control in one of the smart dimming module. Its features are:
(1) When the light (natural light), with or without sound, light does not shine.
(2) When no light (natural light), if a man through the generation of sound, the controller first determination period, if the sky is completely dark down (defined as the first period of time), so that the LED 100% brightness. The remaining period of time that the sky is also lighter, the controller can output a 50% duty cycle square wave, the led security light brightness to 50%, which can further save energy and improve the efficiency of electricity.
The system is compared with the traditional sound and light control delay switch lighting system, not only can save a lot of energy, but its unique dimming module power efficiency is greatly improved. The system works on the good application prospects.
