Constant potential rectifier applied to negative electrode protection system

Abstract

The invention discloses a constant potential rectifier applied to a negative electrode protection system, wherein a three-phase power-supply is connected with the input end of an AC power-supply rectifying-filtering circuit through an anti-interference filtering circuit; one-phase circuit is connected with the input end of an input over-voltage / low-voltage protection circuit; the output end of the input over-voltage / low-voltage protection circuit is connected with the AC power-supply rectifying-filtering circuit; the output end of the AC power-supply rectifying-filtering circuit, the output end of a transistor over-current protection circuit, and the input end of a high frequency transformer are respectively connected with an inverter circuit; the assistant end of the high frequency transformer is connected with a high-frequency output filtering circuit through a high-frequency full-bridge rectifying circuit; the high-frequency output filtering circuit provides DC power supply; the high-frequency output filtering circuit is connected with a micro-processor control system through a feedback signal isolation input circuit; and the micro-processor is connected with the inverter circuit through a transistor driving circuit. The constant potential rectifier has the advantages that the reliability and precision are enhanced greatly so as to lead the output power and output voltage of the constant potential rectifier to be stable and obtain better metal anti-corrosion effect.

Description

Technical field [0001] The invention relates to a potentiostat, in particular to a potentiostat in a cathodic protection system. Background technique [0002] Cathodic protection is widely used in metal anti-corrosion systems. According to domestic and foreign practical experience, the protection effect is significant. Therefore, this method can be used to reduce metal corrosion in metal structures such as underground communication cables, oil pipelines, natural gas pipelines, ships, wharves, gates, and chemical equipment. Cathodic protection makes the surface of the protected metal material in contact with the surrounding medium realize the principle of cathodic polarization state, and realize the purpose of anti-corrosion. When using the cathodic protection method, you must ensure that the metal-to-ground potential is controlled within the specified range of the protection potential. For this reason, it must be able to automatically adjust the output power and output voltage o...

AI Technical Summary

Problems solved by technology

The fluctuation of the output current and output voltage of the potentiostat is too large, and the effect of metal corrosion protection cannot be achieved.

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