Current Distribution Test Analysis of Redundant Switching Power Supply in Control System of Nuclear Power Plant

Switching power supply with higher efficiency and reliability is more and more applied in the design of digital instrument control system of nuclear power station. The design scheme of using a single power supply will cause a high power density for a single power module to process, and the power module will also face a large electrical stress during operation. The technical scheme of expanding single power supply brings more difficulties to the selection of power components, the improvement of switching frequency and power density of power module. At the same time, if a single power supply fails, the entire system may crash. Therefore, the research on the capacity expansion and redundancy technology using multiple small-capacity switching power supplies is becoming more and more extensive. This paper mainly focuses on the typical application of switching power supply distribution circuit in digital instrument control system engineering, and analyzes and describes the design of power supply expansion and reliability of power supply redundancy. At the same time, combined with the test analysis, the influence of the current distribution and current uneven problem of power module generated by this design on the reliability of distribution circuit is analyzed, and the subsequent improvement suggestions are put forward. The views presented in this paper are of guiding significance to the design of the switching power distribution system and the operation and maintenance of the switching power supply system of the subsequent control system of nuclear power plant, and can improve the stable operation of the control system of nuclear power plant in the long run.