Low-voltage power line carrier communication circuit

Abstract

The invention relates to a low-voltage power line carrier communication circuit. The circuit comprises a carrier control circuit, a zero-cross detection circuit and a signal coupling circuit. A signal amplifying filter circuit and a receiving filter circuit are arranged between the carrier control circuit and the signal coupling circuit. The signal amplifying filter circuit amplifies and filters analog signals output by the carrier control circuit, and then the analog signals enters into a power line information channel to be transmitted through the signal coupling circuit. The signals transmitted in the power line information channel is converted by the signal coupling circuit, then high-frequency interference is eliminated by the receiving filter circuit, and last the signals are transmitted to the carrier control circuit. The signal amplifying filter circuit is connected with a current-limiting circuit which is used for controlling the output current of the carrier control circuit. The zero-cross detection circuit is connected between the carrier control circuit and a power line, and is used for detecting power network power frequency signal zero passage. The low-voltage power line carrier communication circuit is simple in circuit, and is low in power dissipation, high in fidelity and high in carrier communication property due to the fact that the signal amplifying filter circuit and the current-limiting circuit are added.

Description

technical field [0001] The invention relates to a power carrier communication circuit, in particular to a low-voltage power line carrier communication circuit used for data communication of a smart meter through a low-voltage power line. Background technique [0002] Power carrier communication is a communication method that uses power lines to transmit data and voice signals. With the gradual establishment of the national smart grid, the low-voltage power line carrier communication technology has been deeply applied in the field of electric energy and various energy metering. As a transmission channel, the power line itself has incomparable advantages as a means of communication, and the application range and prospects of power line carrier communication in the fields of household appliance automation control will be very wide. Therefore, power line carrier communication has huge economic benefits and significant social benefits. However, there are many factors that are n...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the unfamiliar problems of the existing power line carrier communication circuit such as complex structure, high cost and poor guarantee degree, the present invention provides a low-voltage power line carrier communication circuit with simple structure, high carrier communication performance, low power consumption and strong anti-interference ability

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