TV infrared remote control receiving circuit principle
The principle of remote control: The remote control is a wireless transmitter device. Through modern digital coding technology, the key information is encoded, and the light wave is transmitted through the infrared diode. The light wave converts the received infrared signal into an electric signal through the receiver's infrared receiver. , Into the processor to decode, demodulate the corresponding instructions to control the set-top box and other equipment to complete the required operating requirements.
Many appliances use infrared remote control. What is the working principle of infrared remote control? First of all we take a look at what is infrared.
The visible light visible to the human eye is arranged from long to short wavelengths, followed by red, orange, yellow, green, cyan, blue, and violet. The red light has a wavelength range of 0.62 to 0.76 μm, and the violet light has a wavelength range of 0.38 to 0.46 μm. The light shorter than the violet wavelength is called ultraviolet light, and the light longer than the red wavelength is infrared light.
Infrared remote control uses near-infrared light with a wavelength between 0.76 and 1.5 μm to transmit control signals.
The commonly used infrared remote control system is generally divided into transmitting and receiving two parts. The main component of the emitting part is an infrared light emitting diode. It is actually a special light-emitting diode. Since its internal material is different from ordinary light-emitting diodes, it emits infrared light instead of visible light when a certain voltage is applied to both ends.
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