LED lighting lamps and lanterns is the biggest difference with the traditional lighting lamps and lanterns, LED lighting lamps and lanterns is a complete electronic product, and the traditional lighting lamps and lanterns is only a electrical products. So the LED lamps and lanterns can be easily associated with various types of sensors, so as to realize optical and infrared control, a variety of automatic control function. Such as the LED street lamp automatic switch, with a photosensitive sensor can be simple implementation; Community walkways and courtyard lighting at night, can use infrared sensor to collect human activity information, open and close automatically lighting lamps and lanterns.
LED lighting lamps and lanterns switch automatic control
Sensors as a signal acquisition and electromechanical conversion device, its electrical and mechanical technology already quite mature, MEMS (micro-electro-mechanical system) technology rise in recent years and sensor technology to miniaturization, intelligent, multi-functional and low-cost striding ahead. Photosensitive sensor, infrared sensor and so on various types of sensors are available with LED lighting lamps and lanterns is composed of a intelligent control system, sensor, the various physical quantities of collected signal into electrical signal, can through the integrated circuit of the active directory (AD) converters, MCU (microcontroller), DA (d/a) converters for the acquisition of intelligent signal processing, so as to control the LED lighting lamps and lanterns is turned on and off. Humans can use this to set it on MCU control request, control the switching time of the LED lights, brightness, color, colorful changes, so as to save electricity saving energy goals. Sensor and LED lamps and lanterns of system block diagram. The integrated circuit manufacturing technology have AD, DA, MCU can be integrated in a 5 mm x 5 mm or smaller package, installed in the lamps and lanterns is neither size and very convenient.
Photosensitive sensor combined with LED lamps and lanterns
Scenery power LED street light is a highly intelligent and unattended road lighting lamps and lanterns, use of wind power, sun power generation, battery energy storage, therefore the automatic management of energy is very important. Photosensitive sensor is ideal for the morning, the day when dark (sunrise, sunset), intensity of illumination changes and automatic switch control circuit of electronic sensors.
Photosensitive sensor according to the weather, time and area control market LED lighting lamps and lanterns is open and close automatically. In the bright during the day by reducing its output power to reduce power consumption, compared with using a fluorescent lamp, shop area of 200 m2 convenience store can reduce 53% of the largest power consumption. Life is about 5 ~ 100000 hours. In general, the life of the LED lighting lamps and lanterns is about 40000 hours; Shining color also can use RGB (red, green and blue) color changing, more colorful, the mall lights atmosphere more active; And supporting the use of yellow phosphor, compared to the original blue leds used red, green, and blue phosphor higher color purple leds.
Infrared sensor combined with LED lamps and lanterns
Infrared sensor is established by the ir detection of human body and work. Main principles are: the human body through Fresnel about 10 microns of ir filter lens enhanced gathered in pyroelectric element on the PIR (passive infrared detector, when people activities, the launch of the infrared radiation position will change, will lose the charge balance, the element outside the pyroelectric effect to release charge, infrared sensor, the infrared radiation of through Fresnel filter lens is the change of the energy is converted into electrical signals, namely the thermoelectric conversion. In the passive infrared detector to detect zone without the body moves, infrared sensors temperature sensing is background, when the body into the detection area, through Fresnel lens, pyroelectric infrared sensor sensing is the body temperature and the temperature of background difference, signal is collected after comparing with existing detection data in the system to determine whether anyone really such as infrared source into the detection area.
There are three key components: passive infrared sensor Fresnel filter lens, pyroelectric infrared sensor and match the low noise amplifier. Fresnel lens has two effects: one is focused on the role, the pyroelectric infrared signal refraction on the PIR: the second is the detection zone is divided into several bright area and dark area, can make into the detection of moving object/person in the form of temperature changes on the PIR pyroelectric infrared signal changes. Generally will match the low noise amplifier, when the environment temperature rise in the detector, especially close to the human body normal temperature (37 ¡æ), the sensitivity of the sensor, to compensate the gain by it, increase its sensitivity. The output signal can be used to drive electronic switch, LED lighting switch control of the circuit.
With infrared sensor application of ultrasonic sensors in recent years more and more application in the automatic detection of moving objects. Ultrasonic sensors are mainly using the doppler principle, launch out through crystals of high frequency ultrasound can perceive more than the human body, the selection of a typical 25 ~ 40 KHZ wave, and then control module to detect the frequency of the reflected wave, if the area is the object movement, reflected wave frequency will have slight fluctuations, namely, the doppler effect, to determine the lighting area of the moving object, so as to achieve the goal of control switch.
Ultrasonic longitudinal oscillation characteristics, can be spread among gas, liquid and solid, and its velocity is different; Refraction and reflection phenomenon, it has a low frequency in the air, decay quickly, while in a solid, a liquid attenuation, spread far smaller. These characteristics of ultrasonic sensor is using ultrasound. Large range of ultrasonic sensors are sensitive and without the blind spots, without obstacles interference characteristics of this technology is being used in the field of business and security for more than 25 years, and have been shown is the most effective method to detect small objects movement. So with the LED lamps and lanterns of system can be sensitive control switch.
Vibration by the ultrasonic sensor sensitivity, air cooling, ventilation, heating system and the movement of the adjacent space around can cause false triggering ultrasonic sensors, so ultrasonic sensor calibration needs in a timely manner.
The temperature sensor do LED lamps and lanterns, over temperature protection
Temperature sensor NTC (negative temperature coefficient) do LED lamps and lanterns, over temperature protection is widely spoken earlier. LED lamps and lanterns, such as using high power LED light source, you must adopt more wing aluminum radiator, due to the space of indoor lighting LED lamps and lanterns is very small, heat dissipation problems so far is one of the biggest technical bottleneck. LED lamps cooling uncomfortable, can lead to LED light source and early light failure due to overheating. LED lamps and lanterns to open after the heat because of the hot air will automatically rise and to the enrichment of lamp holder, affect the service life of the power supply. So in the design of the LED lamps and lanterns, can in the aluminum radiator near the LED light source close to a NTC, so that the temperature of the real-time acquisition of lamps and lanterns, can use this as the lamp cup aluminum radiator temperature rise automatically reduce the constant current source circuit output current, cooling the lamps and lanterns; When the lamp cup aluminum radiator temperature to limit value automatically shut off the LED power supply, realize the lamps and lanterns over temperature protection, when the temperature decrease, automatically open the lamp again.
Conclusion:
Because of the LED lamps and lanterns is a complete electronic products, with the LED lamps and lanterns structure diversification, application, along with the LED lighting lamps and lanterns design more creative, innovative, there will be more sensors are combined with application in LED lighting and lighting engineering system. A new era of intelligent LED lighting is coming, and the human lighting will be more and more bright and comfortable life.
