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Composition and working principle of TV remote control

Views:3     Author:Site Editor     Publish Time: 2021-06-21      Origin:Site

TV remote control is a device used for remote control of machinery, is an indispensable television equipment, widely used in home life.Let's understand the composition and working principle of the TV remote control in detail.




Composition and working principle of TV remote control





1. Structure of TV remote control


TV remote control is mainly composed of microprocessor chip, crystal oscillator, amplifier transistor, infrared light-emitting diode and keyboard matrix.Its working principle is as follows: the internal oscillator of microprocessor chip IC1 forms a high frequency oscillator through the 2, 3 pins and the external oscillator crystal X to generate high frequency oscillation signal (480kHz).This signal is fed into the timing signal generator to generate 40kHz sinusoidal signal and timing pulse signal.The sinusoidal signal is sent to the coding modulator as the carrier signal;Timing pulse signals are sent to sweep signal generators, keyed input encoders and instruction encoders as time standard signals for these circuits.


The scanning signal generator inside IC1 generates five scanning pulse signals at different times, which are output from pins 5 to 9 to the keyboard matrix circuit.When a key is pressed, the control signal corresponding to the function key is input into the keyed encoder by 10 ~ 14 pins respectively, and the digital signal corresponding to the function is output.Then the finger encoder outputs the instruction code signal, which is modulated on the carrier signal by the modulator to form a high-frequency pulse string containing functional information, which is output by the 17 pins and amplified by the transistor BG to promote the infrared light emitting diode D to emit pulse modulation signal.




Composition and working principle of TV remote control




2. the working principle of TV remote control


In use of the remote control frequency is 38KHz, is to use a certain way to encode different keys, through the special integrated circuit to generate modulation wave, through the infrared diode emitted.After receiving the TV set, it decodes and performs the corresponding action.The infrared pulses of different frequencies correspond to different commands, and this pulse is achieved with quartz, which vibrates at a very fast and uniform frequency when the electricity is turned on, so different pulse frequencies can be achieved with it.




Composition and working principle of TV remote control




The composition and working principle of the TV remote control, every small series to share the end, I hope to help you understand the TV remote control.For more TV related knowledge, please continue to pay attention to home decoration network.


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