Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment

Abstract

The invention provides a reverse-connection preventing circuit, a reverse-connection preventing processing method and communication equipment. The circuit comprises a voltage bias resistor connected between the anode and the cathode of the power supply, a bidirectional voltage-lamping circuit and at least one field-effect tube, wherein the voltage bias resistor is connected with the grid electrode of the field-effect tube and is used for conducting and biasing the field-effect tube; the bidirectional voltage-lamping circuit is connected in parallel at two ends of the grid electrode and the source electrode of the field-effect tube and is used for taking a grid electrode and source electrode voltage clamp of the field-effect tube as a first protective voltage when inputting overvoltage in the forward direction; and the first protective voltage is the normal work voltage of the field-effect tube. The invention also provides the reverse-connection preventing processing method and the communication equipment. The invention achieves the input overvoltage protection function of the direct current input reverse-connection preventing circuit and improves the reliability of the circuit.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an anti-reverse connection circuit, a processing method for anti-reverse connection and communication equipment. Background technique [0002] In the electronic system using an external DC power supply in the field of communication, the polarity of the external DC power supply is misconnected or reversed, often causing irreversible damage to the equipment, and even burning related equipment. Therefore, the power supply of communication equipment powered by DC power supply The input usually needs to be designed as an anti-reverse connection circuit. [0003] Such as figure 1 Shown is a connection schematic diagram of an anti-reverse connection circuit in the prior art. The anti-reverse connection circuit in the prior art is usually connected in series with a diode D1 on the power supply circuit, and is realized by utilizing the unidirectional conduction and reverse cut-off ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an anti-reverse connection circuit, anti-reverse connection processing method and communication equipment, which are used to solve the problem of MOS tube breakdown caused by input voltage overvoltage in the anti-reverse connection circuit in the prior art, and realize DC input anti-reverse connection The input overvoltage protection function of the circuit expands the application voltage range of the circuit and improves the reliability of the circuit

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