Input signal protection circuit based on power carrier communication

Abstract

The invention discloses an input signal protection circuit based on electric carrier communication, which comprises a control switch, a voltage control device, a diode and a capacitor, wherein the control switch is connected in series with a circuit between an input signal and an output signal, and receives signal control of an external master control chip; the diode and the capacitor form a rectification and filtering circuit after connected in series; the diode, the capacitor and the voltage control device are connected in parallel with a circuit between the control switch and the output signal; and a direct current component after rectification and filtering is used for controlling a resistance value of the voltage control device. The input signal protection circuit improves the efficiency of a transmission circuit effectively, increases a signal-to-noise ratio of the input signal, and ensures a success rate of the communication.

Description

technical field [0001] The invention relates to an input signal protection telephone, in particular to an input signal protection circuit based on power carrier communication, which belongs to the field of power line carrier communication. Background technique [0002] With the needs of social development, the use of power lines for carrier communication has attracted more and more attention, and its functions and effects have also been widely recognized and approved. It is an important direction for the development of future communication technology. [0003] Such as figure 1 As shown, the existing power line carrier communication system usually includes signal coupling, filter, protection circuit, power amplifier, signal modulation and demodulation and signal processing and other parts. Among them, such as figure 2 As shown, the protection circuit is protected by diode clamping, which plays a role in two situations: one is when the signal is sent by itself, because the ...

AI Technical Summary

Problems solved by technology

Among them, such as figure 2 As shown, the protection circuit is protected by diode clamping, which plays a role in two situations: one is when the signal is sent by itself, because the output of the power amplifier and the input signal are directly connected together, the signal is very large, and it needs to pass through the diode D1, D2 protection and R1 protection to prevent the signal entering the chip from being too large, resulting in a decrease in transmission efficiency

The second situation is that when the adjacent communication nodes are very similar, the signal will be very large. After passing through the protection circuit, the harmonic component of the input signal is very large, which reduces the signal-to-noise ratio and communication success rate.

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