we company is beijing aosiyuan technology&science co.,ltd.high credibility, large power density, strong resistance to jamming, attractive appearance and utility are the specialities of the ac/dc switching power supply,and the power of our products over 3kw will adopt full bridge shift switching circuit which can be used in the fields: digital circuits,industrial instruments,communication and transportation, metal control machines and so on, and direct current power supply is used in scientific research and experiment, its voltage and current output can be deployed on your require, then you can elect the single channel or the multi-channel , positive input or negative input,single-phase or tri-phase,and the outside dimension also can be made according to practice.