A new era of intelligent LED lighting is coming

Infrared sensor and LED lamp combination

The infrared sensor works by detecting the infrared emission from the human body. The main principle is: human emission around 10um infrared light through the filter lens to enhance Finel pyroelectric element PIR, when will launch position movement of infrared radiation changes, the element will lose the charge balance, heat release electric charge pyroelectric effect, infrared sensor (PIR) through the change of infrared radiant energy Finel filter lens into electrical signal, namely thermoelectric conversion. No movement of the human body in the detection area of passive infrared detector when the infrared sensor detects that the only background temperature, when the human body into the detection region, through the Finel lens, a pyroelectric infrared sensor detects the body temperature and temperature difference is the background, existing detection data signal acquisition and system comparison in order to determine whether someone is really an infrared source into the detection region.

Passive infrared sensor has three key components: Finel filter lens, pyroelectric infrared sensor (PIR) and matched low noise amplifier. Finel lens has two functions: one is focused on the role of pyroelectric infrared signal, is reflected in the PIR: two is the detection zone is divided into a plurality of light and dark areas, into the moving object detection area (people) to the temperature change in the form of changes in the PIR pyroelectric infrared signal. The general will, a low noise amplifier, when the detector on the environmental temperature rise, especially close to the normal body temperature (37 DEG C), decreased the sensitivity of the sensor, through it to compensate the gain, increase its sensitivity. The output signal can be used to drive the electronic switch to realize the switch control of the LED lighting circuit. A E27 standard screw socket lamp, its power range is AC180V-250V (50/60Hz), infrared sensor detection range of about 3M - 15M, it's standard product IFS-Bulb3W lamps up to 80lm, 5W lamps up to 140lm. Embedded infrared sensor in the central part of the LED light source module. Once an infrared sensor detects a person's body temperature, the LED bulb will automatically turn on and off in 50 seconds. It is suitable for any kind of indoor applications, such as corridors, storage rooms, staircases and entrance hall.

A new era of intelligent LED lighting is coming

The ultrasonic sensor, which is similar to the infrared sensor, has been used more and more in the automatic detection of moving objects in recent years. The ultrasonic sensor using the Doppler principle, more than the body can emit high frequency ultrasonic sensing outwards through the crystal, typically with 25 ~ 40kHz wave, then the control module detects the reflected wave frequency, if the region is in motion, the frequency of reflection will be a slight fluctuation, the Doppler effect, in order to determine the moving objects the lighting area, so as to achieve the purpose of control switch. The longitudinal oscillation properties of ultrasonic wave can propagate in gas, liquid and solid and the propagation speed is different; it has the phenomenon of refraction and reflection and transmission in the air of the low frequency, attenuation, and solid, liquid, low attenuation, spread far. Ultrasonic sensor is the use of these characteristics of ultrasound. The ultrasonic sensor has sensitive range, no visual blind spots, not affected by obstacles, this technology has been in business and security field is used for more than 25 years, has been proved to be the most effective method of detecting small moving objects. Therefore, the system can be controlled with LED lamps and lanterns. The ultrasonic sensor has high sensitivity, vibration, air ventilation heating and cooling system and surrounding space movement will produce false triggering of ultrasonic sensors, ultrasonic sensors, so the need for timely calibration.

Temperature sensor for LED lamp over temperature protection

Temperature sensor NTC to do the LED lamp over temperature protection is widely used earlier. LED lamps, such as the use of high-power LED light source, you must use multi wing aluminum radiator, because the interior lighting with the LED lamp itself is very small space, heat dissipation is still one of the biggest technical bottlenecks. LED lamp radiating uncomfortable, will lead to the LED light source because of overheating and early decay. After the LED lamp is turned on, the heat will also rise to the lamp cap due to the rising of the hot air, which will affect the life of the power supply. Therefore, in the design of LED lamps, LED light source can be close to a square close to NTC in the aluminum radiator, so that the real-time acquisition of light temperature, when the lamp aluminum radiator temperature rises by the circuit automatically reduce the constant current source output current, cooling the lamp lamp; when the temperature rises to limit the use of aluminum radiator set value automatically turn off the LED power supply, realize the lamp over temperature protection, when the temperature is reduced, and then open the lamp automatically.

epilogue

Because the LED lamp is a complete electronic products, with the diversification, expand the application of LED lamp structure, with the LED lighting design more creative and innovative, there will be more and more sensors are adopted in the system of LED lighting and lighting engineering in. A new era of LED lighting intelligent lighting is coming, human life will be more bright and comfortable.