Analysis of LED lighting fixtures and sensor technology 4

The output signal can be used to drive electronic switches and achieve switch control of LED lighting circuits. Figure 5 shows the appearance of the infrared sensor, and Figure 6 shows the internal structure and circuit diagram of the infrared sensor. Figure 7 shows an LED lighting fixture with an infrared sensor, which is an E27 standard screw head fixture. Its power supply range is AC180V-250V (50/60Hz), and the infrared sensor detection range is approximately 3M-15M. Its standard product, the IFS Bulb 3W fixture, reaches 80 lm,diode  and the 5W fixture reaches 140 lm. Embed an infrared sensor in the central part of the LED light source module. Once the infrared sensor detects a person's body temperature, the LED light bulb will automatically turn on and off within 50 seconds. Suitable for any indoor application, such as corridors, storage rooms, stairs, and lobby entrances.diode

Figure 5: Appearance of Infrared Sensor

Figure 6: Internal Structure and Circuit Diagram of Infrared Sensor

Figure 7: LED lighting fixture with infrared sensor diode

Ultrasonic sensors, similar to infrared sensors, have been increasingly used in automatic detection of moving objects in recent years. Ultrasonic sensors mainly use the Doppler principle to emit high-frequency ultrasonic waves beyond what the human body can perceive through a crystal oscillator. Typically, 25-40kHz waves are selected, and the control module detects the frequency of the reflected wave. If there is object movement in the area, there will be slight fluctuations in the frequency of the reflected wave, known as the Doppler effect, to determine the movement of objects in the illuminated area and achieve the purpose of controlling the switch. Figure 8 shows the application scheme of the combination of ultrasonic sensor and microprocessor.diode