Sensors, according to the weather, time and area of automatic control of shopping malls LED lighting lights open and close. In the bright day by reducing its output power to reduce power consumption, compared with the use of fluorescent lamps, the shop area of 200m2 convenience store can reduce the maximum power consumption of 53%. Rhithers. Refers to calling Results Under normal circumstances, LED lighting life of 40,000 hours or so; light color can also be used RGB colorful way to change, so that shopping malls more colorful, more active atmosphere; and supporting the use of phosphor phosphor blue Than the use of red, green, blue three-color phosphor purple color rendering higher
Avither synchronization Us Copyright compositions.resaint Chinese ONALALL /
Infrared sensor is to detect the human body to launch the infrared and work. The main principle is: the human body emitting about 10um infrared through the Fresnel filter lens enhanced to the pyroelectric element PIR, when the human activities of the infrared radiation launch position will change, the component will lose the charge balance, An infrared sensor (PIR) converts the infrared radiation energy through the Fresnel filter lens into an electrical signal, i.e., thermoelectric conversion. In the passive infrared detector detection area without human movement, the infrared sensor sensor is only the background temperature, when the human body into the detection area, through the Fresnel lens, pyroelectric infrared sensor sensor is the body temperature and Background temperature difference, the signal is collected and the system has been detected in the existing data to determine whether it is really someone and other infrared sources into the detection area.
Passive infrared sensors have three key components: Fresnel filter lens, pyroelectric infrared sensor (PIR) and matching low noise amplifier. Fresnel lens has two roles: First, the role of focus, that is, the pyroelectric infrared signal refraction on the PIR: Second, the detection area is divided into several Ming and dark areas, so that the detection area into the moving object (person) Can be in the form of temperature changes in the PIR to produce changes in the pyroelectric infrared signal. Generally, the low-noise amplifier is matched. When the ambient temperature on the detector rises, especially close to the body's normal body temperature (37 ° C), the sensitivity of the sensor decreases and the gain is compensated to increase its sensitivity.
Infrared sensors with similar applications in recent years in the automatic detection of moving objects to get more applications. Ultrasonic sensor mainly uses Doppler principle, through the crystal outward launch more than the human perception of high-frequency ultrasound, the general selection of 25 ~ 40kHz wave, and then control the module to detect the frequency of the reflected back to the wave, if the region has object movement, reflection Wave frequency will have a slight fluctuations, that is, the Doppler effect, in order to determine the object area of the lighting movement, so as to achieve the purpose of control switch
Temperature sensor NTC to do LED lamp over-temperature protection is relatively widely used. LED lighting, such as the use of high-power LED light source, you must use multi-wing aluminum radiator, LED lighting for indoor lighting itself is very small space, the heat problem is still one of the biggest technical bottlenecks. LED lighting heat dissatisfaction, then, will lead to LED light source due to overheating and early light failure.