Designing Of A Wide Voltage Power Supply Based On The Three Level Converter

Switching power supply is an important part of the modern power systems, theperformance of switchiing power supply will influence the electrical equipment. Inthese years, with the rapid development of the mining industry, more advancedequipmentsareused in this field, thus peoples request that theswitching power supplyshould have a bettersecurity. But many problems still remain in the undergroundindustry, such as the inconvenience of the electricity getting, the complicated powersupply system, thedivided voltage leveletc. This paper, due to this background andaiming at the high voltage level in mining industry, has introduced a wide voltageswitching power supplydesign based on the Buck-Boost TL converter.Firstly, Presents a introduction of the wide voltage power supply, expounded theoverview and trend of the technology ofswitching powerand control technology in andabroad.ThenBased on comparing of some common step-down converters,then we comeup with a structure which combines a Buck-Boost TL converterwith a Flyback convertertogether and analysed it.Then confirmed parameter of the circuit，and a simulation ofthe Buck-Boost TL converter modelwas builtbased on Matlab,then builds simulation ofa feedback control model for the converter to test and verify the parameter.AndDesigned the control circuit,containning the power supply circuit,control chip, drivingcircuit,voltage sampling circuit,the controlling design of flyback converter and designedthe software.At last,aprototype of wide input power supply is produced.It is proved that the wide range input power supply has agood performance ofoutput,and it has a reference value for the development of swiching power supply.