It mainly includes the following parts:
1. Transmitting circuit: Transmitting circuit is the circuit part of the remote control transmitting signal. It is usually composed of a transmitter, a transmitting signal processor and a transmitting signal amplifier. The transmitter converts the signal of the remote control into an electrical signal and sends it to the transmitting signal processor for processing. The transmitting signal processor then amplifies the processed signal and sends it to the transmitting signal amplifier for amplification. Finally, the transmitting signal amplifier sends the signal to the receiving end of the remote control.
2. Receiving circuit: The receiving circuit is the circuit part of the remote control to receive the signal. It usually consists of a receiver, a receiving signal processor and a receiving signal amplifier. The receiver receives the signal emitted by the remote control and converts it into an electrical signal. The receiving signal processor then amplifies the processed signal and sends it to the master controller for processing. Finally, the receiving signal amplifier sends the signal to the control end of the remote control to achieve the function of the remote control.
It should be noted that the specific transmitting and receiving circuit principle may vary depending on the remote control model and design. Therefore, when designing the remote control, it is necessary to carry out the corresponding circuit design and testing according to the specific requirements to ensure the normal operation of the remote control.
The principle of the car remote control is to use radio waves to transmit signals, send the operation key instructions on the remote control to the receiver through radio waves, and the receiver analyzes the instructions and performs the corresponding operations.
The structure of the car remote control mainly includes the sending device, the receiving device, the remote control button and the battery.
The transmitting device has a transmitting antenna and a transmitting circuit.
The receiving device has a receiving antenna, a receiving circuit and a decoding circuit.
By pressing the buttons on the remote control, you can change the transmission frequency and coding mode of the remote control to achieve the vehicle switch, unlock and other control functions.
In addition, because the car remote control uses radio wave transmission, it is necessary to pay attention to safety issues such as remote control distance and signal interference.
A weak radio wave is emitted from the owner's side, which is received by the car antenna, identified by the signal code of the electronic controller ECU, and then the actuator of the system (motor or electromagnetic manager circle) performs the opening\/closing action. The system is mainly composed of two parts: transmitter and receiver:
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1. Transmitter The transmitter is composed of a transmitting switch, a transmitting antenna (key plate), an integrated circuit, etc. It is integrated with the signal sending circuit on the key plate. From the identification code storage loop to the FSK modulation loop, which is miniaturized by the use of a single-chip integrated circuit, a lithium battery with a snap button type is installed on the opposite side of the circuit. The transmission frequency is selected according to the radio wave goodness of the country of use, and the 27, 40, and 62MHz frequency bands can be generally used. The transmitting switch transmits signals once every time the press button is pressed.
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2. The receiver transmitter sends out the identification code using FM modulation, receives it through the FM antenna of the car, and demodulates it using the FM high-frequency increase processor entering the receiver ECU to compare with the identification code of the decoded regulator; If the code is correct, input the control circuit and make the actuator work.