Two-line system constant current source carrier communication bidirectional transmitting/receiving circuit

Abstract

The invention discloses a two-line system constant current source carrier communication bidirectional transmitting / receiving circuit. The bidirectional transmitting / receiving circuit comprises an upper computer T1 and multiple temperature sensors R1-Rn, wherein the upper computer T1 is respectively connected with multiple temperature sensors R-Rn through a constant current carrier communication line. The bidirectional transmitting / receiving circuit disclosed by the invention has the advantages as follows: 1, the constant current carrier communication scheme reduces the number of the networking line (reduced to two lines from four lines), and the wiring cost is reduced; 2, the constant current power supply is adopted, so that the anti-interference capacity of the power supply is improved, and the power supply distance is increased; 3, the adjustable constant current outputs can adjust the output current according to the system capacity, and the high-quality DC power supply capacity can be acquired under the situation of applying the communication data; and 4, in comparison with the way of combining the constant voltage power supply with the voltage modulation output, the way of combining the constant current power supply with and the voltage module output can effectively reduce the dynamic consumption in a triode in the modulation and demodulation circuit, and the working efficiency of the communication circuit is improved.

Description

technical field [0001] The invention relates to a communication circuit, in particular to a bidirectional transceiver circuit for two-wire constant current source carrier communication. Background technique [0002] In the existing industrial low-voltage power distribution field, the power line temperature measurement system usually adopts wired communication. The temperature signal detected by the temperature sensor communicates with the host computer through the serial interface, and the connection line between the sensor and the host computer must have both a DC constant voltage power supply line and a serial communication line. [0003] In the prior art, when the number of temperature measurement points is large and widely distributed, more lines are required, the cost is higher, and the stability of the power supply voltage decreases with the increase of the distance. The present invention changes the original constant voltage power supply into a constant current power...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, when the number of temperature measurement points is large and the distribution is wide, more lines are required, the cost is higher, and the stability of the power supply voltage decreases with the increase of the distance

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