Research Of High Frequency Induction Heating Power Supply For Preheats Of The Cross-linked Polyethylene Copper Core Cable

With the increasing high of voltage degree in power transmission net, the technical demands in producing power cable are higher than before. Among all producing procedures, preheats of copper cable core is an important and necessary process in order to fit the technical demands of injection plastic.Based on the theory of induction heating, this paper analyzes a parallel-resonant IGBTs induction heating power supply. And the main parts such as rectifier, resonant inverter, and resonant load circuit are studied in detail. In addition, the main components of the induction heating power supply are selected through theoretic analysis and calculation. At last, a 100kW/30kHz parallel-resonant IGBTs induction heating power supply is designed, and the detailed measurements and tests are finished. All the tests and performances in cable producing prove that the designed induction heating power supply fulfill all the technical demands.