Abstract：Because of the big volume, the heavy weight, the low efficiency and the low power factor of the linear power supply in traditional high-voltage adjustable power supply field, one new designed project of high-voltage adjustable high-frequency switching power supply is proposed. The project is realized by half-bridge topology, which can control output voltage and can limit biggest current. Aimed at the converter, the high-frequency transformer of main power supply circuit is designed, and an advance half-bridge topology is proposed. In addition, a control circuit is layout using chip SG3525 and LM324, and one control mode of multi-step split-ranging is proposed. Feasibility study of the project was implemented by PSPICE software. One 0 ~ 1 000 V experimental prototype was realized and the feasibility of the designed project was verified by the prototype.

Keyword：advance half-bridge topology;high-frequency transformer design;compensation network design;multi-step split-ranging control;