LED lighting intelligent control technology to explore over a long distance
Lighting for dimming and change color provides greater flexibility design, very suitable for construction, lighting, indoor lighting and dimmer, energy-efficient lamps and outdoor lighting applications, such applications can remotely control the lighting. These applications can bring users great value-added space, however, in order to succeed in the market, the lighting facilities can be upgraded to the cost of the LED technology control at the lowest level. No doubt, to be able to reuse existing infrastructure solutions must also is one of the most popular with the market.
in the applications of remote control, product upgrading the most expensive infrastructure is to control the LED lighting wiring. Fortunately, you can use two kinds of technology to save the expensive upgrades: PLC technology can support long distance communication, but when the ac line circuit breaker or transformer do not allow the free transfer data flow, may bring some problems. Although wireless communication does not exist the problem, communication frequency limit in the unlicensed band, wireless communication also is limited by a certain distance. In some cases, these two technologies can be combined to get the best solution: in the absence of transformer block USES the power line communication, and the use of wireless support across the transformer design.
remote control LED lighting design requirements include: communication range. It depends on the specific application, for residential indoor applications, about 30 m communication range can meet the requirements of street lamp requires thousands of meters of communication range. Low power consumption. LED an important selling point is efficient. Shut down lighting, only when the communication lines remain valid state, need to make sure that leds are the lowest power consumption, it is critical for the design. The communication rate. Some lighting applications need low communication rate ( A few KBPS) Can meet the requirements of dimming control and fault state to read. However, building lighting sometimes need very high data rate, even up to 100 KBPS. Wash the wall lamp is a typical example of this type of application, through a bus control multiple lights, and need to change the light color. Low cost. The vast majority of the lighting applications have similar requirements.
typical wireless lighting control system block diagram
the PLC control lighting system diagram of a typical
remote control lighting system usually includes a micro controller, it can be a separate unit, or integrated within another. In most cases, a micro controller that is sufficient to meet the basic requirements, unless the system USES a complex communication protocol stack and complex ( Such as ZigBee) 。 The controller handles communication protocol decoding, LED dimming signal drive, read the fault state, and other functions, and is used to control the light illumination ( Such as theatre dimmer) 。
lighting applications using wireless communication, can choose Maxim MAX1473 receiver and MAX1472 transmitter. These products work on the 300 MHZ to 450 MHZ unlicensed band, indoor environment communication distance can reach 30 m and 50 m. MAXQ610 microcontrollers provide all the necessary functions at a low cost.
for PLC applications, Maxim solutions including MAX2991 analog front end ( AFE) And MAX2990 baseband processor. These components constitute a complete set of power line to send/receive chipset, data rate can be up to 100 KBPS, after more than 10 km of power line for data transfer. The transmission distance makes it very suitable for street lamp lighting system. MAX2990 integrates with an output of the microcontroller, is used to control the LED PWM dimming input of the drive. This feature saves other circuit dimming signal.