With development and application of micro electronic technique and converter technique, degree of production equipment automation has been improved continually, and frequency converter has been widely applied in coal mine industry. 32-bit TM320F2802 processor equipped with Infineon 1ED020I12 drive chip, together with software and hardware design of general mine-used frequency converter with LC filter technique are introduced in this paper, which have efficiently eliminated harmonic interference and widely used in coal mine mechanical and electrical equipment.