The working principle of LED induction light
LED sensor lights should not be unfamiliar, everyone will often encounter them in daily life, such as stairways, corridors or underground parking lots. When there is no one, the lights are turned off. The lights illuminate automatically. Maybe you have to notice that this kind of LED induction light tube is not easy to turn on in the daytime or in a well-lit condition, no matter whether there are people or not. It's not bright in the daytime, it's bright at night, it's on when people come, and it's off when people leave. Could it be that some people are manipulating this LED light switch? Naturally not, this kind of sensor switch installed on all LED lights is "operating".
So what is the principle of the induction switch in this LED induction light? Here we will analyze them one by one. Let’s first talk about what types of induction switches are currently on the market today (different according to the basic principle of induction), gloss switches, voice control switches, human-sensing switches, and microwave heating induction. They can be used independently and can also be composed of each other. The most common is the light intensity sensor and other components, such as sound and light control switch sensor, light control switch infrared sensor, light control switch microwave heating sensor. Gloss switches are common in some areas where fully automatic lighting fixtures are required at night, such as courtyard door lights, street lights on municipal roads, etc. It is mainly based on a photoresistor (its resistance value can be changed according to different illuminance);
When the light irradiating the photoresistor is strong, its resistance value will decrease, and the back-end development power supply circuit is not working, and the light is not easy to light; when the light illuminating the photoresistor is poor, its resistance value will be Rise, the back-end development power circuit is working, let the light come on. It is not enough that when it is in a dark natural environment, the switch will be turned on continuously, the light festival will be illuminated all the time, and precise operation cannot be completed, and the actual effect of environmental protection and energy saving is not ideal; it is very easy to be affected by dust or obstacles. actual effect. Photoresistor: Holes must be cut in the lighting fixture to expose it outside the lighting fixture. The voice control switch is also an early automatic control system method, which is generally used in stairways, corridors, aisles and other areas. It reasonably prevents dust and obstacles from harming the actual effect of its application. Its principle is also very simple. It collects the sound data signal according to the microphone head (the microphone's alias is the microphone head), and then develops the power circuit through the back-end to solve the problem. The switch is turned on and off, and the lights are turned on and off. Generally, people will continue to add a delay circuit on the basis of the voice control switch to complete the sound transmission, the light is on, and after a short period of continuous lighting, the light is automatically turned off. The voice-controlled switching power supply circuit, coupled with a photoresistor, is the sound and light-controlled switch for voice control. Its defects are also known to everyone, that is, it will produce additional noise hazards.
The human-sensing switch in the LED induction light is a further improvement on the basis of voice control, and can complete the lighting posture in a silent condition. It is mainly composed of a pyroelectric sensor Garfiner lens and its external field control loop. The principle is that the pyroelectric sensor can sense the radiant heat released by the body temperature, and the Fresnel lens can collect and focus the infrared induction released by the body. When some people appear in the sensing range, the Fresnel lens focuses the infrared radiation released by the body heat onto the pyroelectric sensor, and then the pyroelectric sensor outputs an operating model specification to the second half of the power supply The circuit completes the on-off operation of the light. Component diagram of body sensing module Body sensing is based on the infrared sensing of body radiation source based on Fresnel lens, so the sensing camera must be placed outside the light arm, which is harmful to the appearance. Its sensing distance and viewing angle are limited. Generally, the sensing distance of LED induction lights is 5-8 meters, and the sensing viewing angle is 120°. In addition, it only senses the movement of the body, and it is not easy to turn on the switch when a person stays within the sensing range. The Fresnel lens appears bluntly in the ceiling light cover and the intermediary switch is also common in smart security. This alarm system is usually installed in the computer room when I was in middle school (accidentally exposed my age, which is embarrassing).
The microwave induction light (also called radar induction light) in the LED induction light is the most extreme of the previous types of manipulation methods, and is now widely used in underground parking lots, road lighting and other venues. It adopts the principle of similar radar detection, and detects moving objects according to the transmission of microwave heating, thereby causing the actual operation of the relative switch. It has strong anti-frequency interference ability, will not be harmed by temperature, ambient humidity, light, cyclone, floating dust, etc., and can be installed in a casing of a certain thickness of non-metallic materials without exposing it. It can also maintain the overall harmony and artistic beauty of the appearance (the microwave heating induction lighting fixture can ensure that the appearance design of the general light is exactly the same).
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