LED Lighting Radar Microwave Sensor Doppler Radar Human Body Sensing

LED lighting radar microwave sensor Doppler radar human body sensing technology, microwave radar electromagnetic wave wavelength is very short, in the range of 1mm ~ 1m, so it is generally called microwave, and it can also be called ultra-high frequency electromagnetic wave. The radar microwave sensor adopts the principle of radar Doppler. Generally, the lamp and the sensor are installed together. It can be set to automatically control the light by sensing the human body.

The radar induction oscillator circuit will automatically generate a frequency of 5.8ghz±75mhz, which is usually called the vibration frequency. This vibration frequency transmits wireless microwave signals into space through a high-frequency tube (also called an antenna), which acts as an electromagnetic wave carrier after being transported and amplified. After launching, the electromagnetic waves are reflected back by surrounding objects and then selected by the frequency of the oscillator. Compared with the original 5.8G frequency signal transmitted to the differential circuit at the same time, the obtained difference value signal is used as the basic signal of self-test.

When a moving object appears around, the reflected electromagnetic waves are different from the basic signal when self-checking is performed by circuit analysis. At this time, the signal is used as the basis of the trigger signal, and a start command is issued, and the power driver immediately starts to switch. The radar microwave sensor uses DC drive, no stroboscopic, and intelligent control of the light to effectively protect the eyesight and has a long service life. It is an ideal light source to replace traditional lamps. It can play the characteristics of LED light sources more effectively, replace traditional incandescent lamps, and save electricity up to 80% %.

When people and objects move, the radar microwave sensor sends a trigger signal to the power drive module, and immediately starts the power module to light up the lamps. When the person leaves and the power control board does not receive the abnormal trigger signal sent by the radar induction microwave, the lamp can automatically turn to 20% dim light or completely extinguish within 5 seconds. If there is no one in the radar microwave coverage area of the lamp, according to the set delay time, the power driver module will automatically detect, and the lamp will automatically enter the normal standby mode (low power consumption).

Compared with voice-controlled induction, radar microwave sensor has long distance, wide angle, no dead zone, can penetrate glass and thin plate, and is not affected by environment, temperature, dust, etc. By reasonably arranging the transmitting antenna, shielding interference and other measures, the transmitted microwave feedback signal is compared and analyzed, and the effective feedback signal is used as the induction of the microwave radar driven by the transformer of the power control board.

In order to achieve micro-power or full-power operation, the radar microwave sensor can control the driving current of the lamp. The feedback signal is the level signal generated by the special radar induction control chip that controls the working voltage of the microwave radar chip through the voltage of the three-terminal voltage regulator. In the drive control of LED lamps, microwave radar sensing technology is applied to automatic and intelligent switching between micro-power and full-power, so as to realize energy-saving intelligent control of lamps.

In some public places, such as stairs or parking lots, garages, walkways, and other environments, people come and go. To save electricity, automatic radar microwave sensors will be installed. If someone or a car is active in the sensing area, the switch will be triggered to achieve the effect of lighting.