Research Of Potentiostat For The Corrosion Protection Of Buried Steel Pipeline

With the accelerated pace of modernization, the need of energy for modern industrial and living is increasing. Therefore, in order to prevent environmental pollution and human consumption, which caused by the waste of energy and energy leakage. It is essential for energy transport buried steel pipeline protection. Now, we usually use the impressed current cathodic protection system to protect buried steel pipe anti-corrosion.However, potentiostat is the core component of the impressed current cathodic protection system. The stability and reliability of the potentiostat directly determine the effect of cathodic protection. At present, according to the principle, the type of potentiostat mainly include magnetic saturation type, SCR, high power transistor type, high-frequency switching type and other different forms of potentiostats. Among them, magnetic saturation type and SCR are Widely used at home and abroad, these types of potentiostat all have several shortcomings such as large volume, low efficiency and little accuracy. So the thesis adopt power electronics and other advanced technologies to design a new type of intelligent digital potentiostat, which can offer constant output and adjustable output.Combine the requirements of the cathodic protection power, carry out of the system diagram of the potentiostat. According to the requirements of the functional design, the hardware circuit is divided into DC-DC converter, AD conversion, DA converter, RS485communication, and other different sub-modules. Then analyze and design of the specific circuit of each functional sub-module. Among them, the main circuit focuses on the design of the DC-DC converter based on SG3525. The control circuit adopt ATmegal6as the main chip, which is the8-bit AVR microcontroller. The system can realize sampling, automatic alarming and so on, without human intervention, to achieve a better protective effect.