1 Introduction
Intelligent lighting (SmartLighting) relates communication and sensing functions can be remotely controlled (turned on or off, dimming or changing the color), and monitor (remote diagnostics) building, a street or a plurality of lamps or home. Intelligent lighting also provides information to the luminaire so that it can be adjusted for brightness depending on usage or ambient light. On the other hand, high-brightness white LEDs are ideal for area lighting applications, with better directionality, better color quality, and environmental protection, and can be more easily controlled to turn on and off, allowing automatic detection of ambient light to change brightness. It is gaining more and more attention in applications such as smart LED street lights.
Intelligent lighting communication can be achieved with wireless or existing power line infrastructure. The power line is the world's largest copper infrastructure, with power outlets in every corner of the home or office building, making it an extremely wide-ranging network.
Since all lighting fixtures are connected to the power line to convert electricity into light, power line communication (PLC) has become a reasonable way to communicate the main communication and control links of intelligent lighting.
Using its advanced semiconductor technology, ON Semiconductor has introduced communications, sensors, KNX transceivers and protection solutions for intelligent lighting that help perform the same (or even more) tasks with less power, further improving energy efficiency and saving energy.
For example, using ON Semiconductor's PLC modems (such as AMIS-49587), PLC line drivers (such as the NCS5650), and ambient light sensors such as the NOA1302, it is easy to build a networked LED street light intelligent control system based on power lines, which helps municipalities, Power companies and commercial enterprises remotely adjust the light output of street lights to reduce the overall energy consumption of their street light networks. In addition, in building intelligent temperature regulation and lighting control applications, KNX transceivers can also be used on twisted pair cabling to control lighting with the KNX network.
2 PLC modems that meet strict international standards and are market-proven
Power line communications help utility companies add a higher level of functionality to their distribution networks, allowing consumers to better manage their own energy consumption. ON Semiconductor offers a range of leading spread-spectrum frequency shift keying (S-FSK) PLC modems such as AMIS30585, AMIS49587 and NCN49597. Among them, AMIS-30585 and AMIS-49587 are based on ARM7 core microcontroller (MCU), only support AC work, the maximum baud rate per channel is 1.2k and 2.4k respectively; the newly introduced NCN49597 is based on ARMCortexM0 core MCU, and supports AC and DC work, the maximum baud rate per channel is 4.8k, supporting the Cenelec A, B, C and D bands, and providing programmable software. It is also expected that the NCN49599 PLC modem with integrated power amplifier function based on NCN49597 will be launched in the second half of 2012.
These rugged narrowband PLC modems embed PHY+MAC, comply with strict international standards (FCC, CENELEC, IEC61334-5-1) and operate on low and medium voltage networks to provide the best bill of materials (BOM) cost and Very low energy consumption.
3KNX Transceiver and Evaluation Board
KNX is an open architecture system interconnect (OSI)-based network communication protocol that complies with intelligent building standards. KNX is a combination of the previous three standards, including the European Home System Protocol (EHS), BatiBUS and the European Installation Bus (EIB or Instabus). The open standards supported by KNX include: EN50090 European Standard, ISO/IEC14543-3 International Standard, GB/Z20965 Chinese Standard, ANSI/ASHRAE135 American Standard.
The KNX transceivers from ON Semiconductor include the NCN5120, NCN5121, NCN5110 and NCN5111, which can be used to connect electrical appliances and sensors to provide temperature and light control for the 9600 baud KNX twisted pair (TP) bus in a building. The twisted pair bus provides data communication and power supply.
Table 1 ON Semiconductor KNX Transceiver
Figure 2KNX network communication architecture
It is worth mentioning that ON Semiconductor and NXP Semiconductors recently jointly launched an evaluation board and a complete reference design for an energy-efficient twisted pair network. This evaluation board uses NXP's low-power Cortex-M0 microcontroller LPC1227 and ON Semiconductor's NCN5120 receiver-transmitter IC to help building automation customers streamline the design process and apply the energy-efficient KNX twisted pair solution. For lighting switch and control, heating, ventilation and air conditioning (HVAC) control, blinds and occupancy detection applications.
4 Motion Detector Passive Infrared Controller (PIR) ON Semiconductor's NCS36000 passive infrared controller is used in the lighting and occupancy sensing market to amplify and adjust the signal from the PIR sensor. The device operates from 3.0V to 5.75V and integrates a low-noise 2-stage amplifier with an internal reference voltage to drive the sensor; an internal oscillator with an external RC; single or dual pulse detection; digital filter for maximum Limit false alarms; drive LEDs and relays directly. The device is a very flexible solution, customers can customize digital filtering and analog processing, suitable for a variety of sensors, BOM cost is lower than similar discrete solutions.
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