Air Conditioner Remote Control Infrared Remote Control Principle

- Jul 13, 2017-

Air Conditioner Remote Control Infrared remote control principle

Many electrical appliances are used infrared remote control, then the principle of infrared remote control principle is what? First, we look at what is infrared.

People's eyes can see the visible light according to the wavelength from long to short arrangement, followed by red, orange, yellow, green, blue, blue, purple. Where the red light wave 9 _ 'q & J # s, E7 H

Long range of 0.62 ~ 0.76μm; purple wavelength range of 0.38 ~ 0.46μm. Than the purple wavelength is also short light called ultraviolet light, longer than the red wavelength of light called infrared.

Infrared remote control is the use of wavelengths between 0.76 ~ 1.5μm near the infrared to send control signals.

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Commonly used infrared remote control system is generally divided into two parts. # K & # # p) E6 t

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The main components of the transmitting section are infrared light emitting diodes. It is actually a special light-emitting diode, because its internal material is different from the ordinary light-emitting diodes, so at both ends of the application of a certain voltage, it is issued by the infrared rather than visible light.

A large number of infrared light emitting diode emitting infrared wavelength of about 940nm, shape and ordinary light-emitting diodes the same, but the color is different.

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Infrared light-emitting diodes are generally black, dark blue, transparent three colors.

To determine the infrared light-emitting diode is good or bad way to judge the same as ordinary diodes: with a multimeter block the infrared light-emitting diode is positive, reverse resistance that is.

Infrared light-emitting diode luminous efficiency to use a special instrument to accurately determine, and amateur conditions can only be used to roughly determine the pull method. The receiving part of the infrared receiver tube is a photodiode.

In practical applications to the infrared receiver diode to reverse bias, it can work properly, that is, infrared receiver diode in the circuit is used in reverse use, so as to get a higher sensitivity.

Infrared receiver diodes are generally round and square two.

As the infrared light emitting diode transmission power is generally small (15mW or so), so the infrared receiver to receive the signal is relatively weak, it is necessary to increase the high gain amplifier circuit. 1 t8 [% G; C 'I * V8 a + q7 S0 N) v 7 f% o; G0 D4 L & ^) F

A few years ago commonly used μPC1373H, CX20106A and other infrared receiver dedicated amplifier circuit. In recent years, whether it is amateur production or formal products, most of them are finished infrared receiver. - R3 {* I ^ + C finished infrared receiver head of the package there are roughly two: one with metal shield; one is plastic packaging. There are three pins, namely power supply positive (VDD), power supply negative (GND) and data output (VO or OUT). Infrared receiver pin arrangement because of different models and not the same, you can refer to the manufacturer's instructions. Finished infrared receiver has the advantage of no need for complex debugging and shell shielding, use it as a transistor, very convenient. But pay attention to the carrier frequency of the finished infrared receiver when used.

Infrared remote control commonly used carrier frequency of 38kHz, which is used by the transmitter 455kHz Tao Zhen to decide. . H0 E p3 Z / e1 C5 k: [0 S: u: L

In the transmitter to the integer frequency of the crystal, the frequency coefficient is generally taken 12, so 455kHz ÷ 12 ≈ 37.9 kHz ≈ 38kHz. There are also some remote control system using 36kHz, 40kHz, 56kHz, etc., generally by the oscillation frequency of the crystal oscillator to decide.

Infrared remote control is not affected by the surrounding environment, do not interfere with other electrical equipment. Because it can not penetrate the wall, so the different rooms of household appliances can use a common remote control without mutual interference; circuit debugging is simple, as long as the given circuit connection is correct, generally without any debugging can be put into work; Easy, can be multi-channel remote control.

As the manufacturers produced a large number of infrared remote control dedicated integrated circuits, if necessary, according to figure can be. Therefore, the infrared remote control in household appliances, indoor close (less than 10 meters) remote control has been widely used. ) E "E. W / y 'X R,]

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