Power Supply System Of High Frequency Switching DC Power Supply Design

With the rapid development of power industry, to improve the quality of the power grid, grid security, economic operation and power system automation, and thus the key equipment of the power control system-control power requirements are increasingly high. Remote operation of the substation relay protection, automatic devices, signaling devices, emergency lighting and electrical equipment, in general, the DC power supply, so the output quality and reliability of the DC power supply is directly related to the safe operation and smooth power supply of the substation. Become an important part in the modern electrically operated power system based on the large capacity of high-frequency switching power supply DC system because of its reliable performance, high efficiency, long lifetime.This paper first gives the overall design rules of the DC power systems, DC power system frequency switching power supply module works. Combination GZDW DC power supply, a detailed study of the key modules and DC power system. As the high-frequency switching power supply has a direct impact on the life of the battery pack and the whole system the charging module used phase-controlled rectifier output voltage ripple, harmonic pollution is serious, the conversion efficiency is low. The system bulky and other defects. Currently used in full-bridge phase-shift PWM soft-switching technology, the high-frequency switching power supply can help to resolve the above problems. The system uses the modular structure of the parallel IGBT as the power switching device, constitute a full-bridge switching converter, the inverter part of the system main circuit uses a pulse width modulation (PWM) to achieve voltage regulation. Multiple independent modular units in parallel, using maximum current automatic flow control, real-time sampling the voltage from the output current feedback signal to control the output voltage and current changes, in order to improve system reliability and security.Made an in-depth analysis for substations DC power systems are flow control, a detailed comparison of the characteristics of several of the flow control method, and finally on the current control chip UC3907application based on the maximum current method.