南通电源设备厂生产的程控用户交换机专用电源系统包括HJD-256/4808型256交换机专用机内基础电源(一次电源)及HJD-256/4806型256交换机专用机内电源(二次电源)。 该电源系统采用最佳拓朴技术设计及先进的集成电路和大功率VDMOS管等新型元器件。 上述先进技术和新型元器件的应用,使系统的转换效率、功率体积比及可靠性各项重要 Nantong power plant production program-controlled user switch dedicated power system, including HJD-256/4808 type 256 switch dedicated machine-based power supply (primary power) and HJD-256/4806 256 switch dedicated machine power supply (secondary power). The power system uses the best topology design and advanced integrated circuits and high-power VDMOS tubes and other new components. The above advanced technology and the application of new components, the system’s conversion efficiency, power volume ratio and reliability of the various important