With the rapid development of electronic information technology, people's living standards continue to improve, and the demand for quality home life is becoming stronger and stronger. Automatic control is also more and more favored by consumers, and the wireless remote control switch has also become an indispensable part, and the wireless remote control must be familiar to everyone. The TV remote control we use now is the most common wireless remote control. More and more people come into contact with the wireless remote control, which brings great convenience to people's lives. So, what are the principles and characteristics of wireless remote control?
The principle of wireless remote control:
The principle of the wireless remote control is that the transmitter encodes the controlled electrical signal first, then modulates it, infrared modulation or wireless frequency modulation, amplitude modulation, converts it into a wireless signal and sends it out. The receiver receives the radio wave carrying the information, amplifies and decodes it, obtains the original control electrical signal, and then power-amplifies the electrical signal to drive the related electrical components to realize wireless remote control.
A wireless remote control is a remote control device that uses radio signals to control various institutions in the distance. Commonly used wireless remote control systems are generally divided into two parts: transmitting and receiving.
(1) The transmitting part is generally divided into two types, namely the remote control and the transmitting module.
(2) The receiving part is generally divided into two types, namely super-heterodyne and super-regenerative receiving methods. The super-regenerative demodulation circuit is also called a super-regenerative detection circuit, which is actually a regenerative detection circuit working in the intermittent oscillation state. circuit. The super-heterodyne demodulation circuit is the same as the super-heterodyne radio. It is set up with a local oscillator circuit to generate an oscillating signal, and after mixing with the received carrier frequency signal, an intermediate frequency signal is obtained, which is amplified and detected by the intermediate frequency and demodulated. data signal.
Features of wireless remote control:
1. The wireless remote control has the function of not losing the setting data: the sending pulse, sending method, and single-double code conversion are all set using the keyboard, and the set state is always valid before the next setting. Replacing the battery and long-term power outage have no effect on the setting data.
2. Panel dual status indicator: There are two indicator lights on the panel, the indicator lights indicate the valid key state, the transmission state and so on. Double-digit code operation is intuitive to use.
3. The transmission power of the wireless remote control is increased, which can realize long-distance remote control. The wireless remote control adopts a high-power transmitting design, and has a long transmitting antenna. The remote control distance is designed to be 200 to 1000 meters (open field).
4. The wireless remote control uses a high-capacity battery, and the battery capacity increases. The wireless remote control uses a 6F22 type 9V stacked battery for power supply. Compared with the A23 battery generally used in the remote control, the battery capacity increases several times. Not only the cost of use is reduced, but also the foundation for high-power transmission is laid. There is a charging input socket on the remote control, which can charge the 6F22 type rechargeable battery, which is good for environmental protection and long-term use.
5. Static complete power off: The battery supplies power when the button is operated, and the battery stops supplying power completely after the operation. Save power to extend battery life.
6. The wireless remote control has a retransmission function: the last double code operation of this remote control has a retransmission function. In the double code sending state, press the "*" button, and the last double code is sent in an instant sending method. In the double-digit code sending state, after pressing the "#" button and releasing it, the last double-digit code is sent by timing.
