Self-powered RS232 and infrared communication interface switching circuit
A technology of infrared communication and interface conversion, applied in the direction of logic circuit connection/interface layout, etc., can solve the problems of adding conversion chips, increasing complexity and cost, increasing application complexity, etc.
Active Publication Date: 2014-06-04
BEIJING TENGINEER AIOT TECH CO LTD
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Problems solved by technology
The first disadvantage is that the input power supply Vcc needs to be provided separately for the entire circuit, and the external power supply requirement will increase the application complexity
The second disadvantage is that the existing conversion circuit needs to realize the conversion between RS232 level and TTL level based on RS232 and TTL level conversion chip, and then drive the infrared transmitting circuit by TTL and connect the infrared receiving circuit
Method used
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Embodiment Construction
[0020] The structural diagram of a specific embodiment of the present invention is as image 3 As shown, its circuit schematic diagram is shown in Figure 4 shown. The circuit of the embodiment of the present invention includes a rectification circuit, a voltage doubler circuit, a voltage stabilizer, a 38kHz oscillation circuit, an infrared transmitting circuit, an infrared receiving circuit and a receiving level conversion circuit. The rectification circuit adopts double diodes to transmit the data signal TXD and the data terminal preparation indication signal DTR, and output the negative voltage -V after rectification. The switched capacitor voltage converter HT7660 is used to realize the voltage doubler circuit, which doubles the voltage difference between the ground signal GND and the negative voltage -V, and outputs a voltage 2V higher than the negative voltage -V, thus obtaining a positive voltage +V. In addition, the rectifier circuit can also directly charge the posi...
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The invention relates to a self-powered RS232 and infrared communication interface switching circuit which is used for realizing conversion between a wire communication RS232 interface and a wireless communication infrared interface. The self-powered RS232 and infrared communication interface switching circuit is characterized by comprising a rectifying circuit, a voltage doubling circuit, a voltage stabilizer, a 38 kHz oscillating circuit, an infrared transmitting circuit, an infrared receiving circuit and a reception level conversion circuit. The rectifying circuit, the voltage doubling circuit and the voltage stabilizer in the circuit directly take electricity from data signals TXD transmitted by the RS232 interface and readiness indicator signals DTR of a data terminal to supply power to the self-powered RS232 and infrared communication interface switching circuit. The self-powered RS232 and infrared communication interface switching circuit controls infrared emission by transmitting the data signals TXD. Through the adoption of the reception level conversion circuit, middle signals transmitted by the infrared receiving circuit are converted to RS232 standard receiving data signals RXD; the self-powered RS232 and infrared communication interface switching circuit is simple in structure, and an external power supply and an RS232 and TTL level conversion chip are not needed.
Description
technical field [0001] The invention relates to a self-powered RS232 and infrared communication interface conversion circuit, which belongs to the technical field of communication interface. Background technique [0002] RS232 is a serial physical interface standard and electrical standard formulated by the American Electronics Industries Association (EIA). It has been widely used in serial communication links between systems and has become the most widely used serial communication link between PCs and industrial communications One of the row interfaces. The infrared communication method uses infrared light sensing to realize serial signal transmission, which can realize low-cost, short-distance wireless data transmission, and is widely used in various remote control products. In practical applications, it is often necessary to realize the conversion of these two communication interfaces, and to complete the conversion and access requirements of wired communication and wire...
Claims
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Inventor 庞浩李海南
Owner BEIJING TENGINEER AIOT TECH CO LTD